2631 Vol-4 PDF
2631 Vol-4 PDF
2631 Vol-4 PDF
FOR
VOLUME – 4
01.01 SOURCE
The irrigation reservoirs in Tandula complex and in Mahanadi river Project (MRP)
complex form the sources of water supply to Bhilai Steel Plant. These reservoirs and
associated canal systems are owned and operated by Water Resources Department,
Chhattisgarh Govt..
Industrial water supply for most of the consumers is met from the recirculation system
comprising Cooling Pond (Maroda - I), pump houses, supply and return water channels
and the distribution network. The losses in the system are made-up from the storage
reservoir, which supplies make-up water to the Cooling Pond periodically by gravity.
Separate recirculation systems having cooling towers, pump houses, clarifiers etc. have
been provided for some of the units where water requires higher degree of cooling or
gets physically and chemically contaminated.
.
The additional requirement of make up water for the proposed expansion of Bhilai Steel
Plant from 4.0 Mt/y to 7.0 Mt/y will be of the order of 5500 m3/h. In order to conserve
water, it is envisaged to re-use the industrial effluents as make up water to various water
recirculation systems of the plant after proper treatment.
The average water quality report of water available in Maroda - I and Morada – II
reservoir is given in Table 1.0 below:.
Table - 1.0
1.4.1 The Tenderer shall follow the logical sequence in submission of drawings for the
Purchaser’s /Consultant’s approval. The drawings submitted shall be fully dimensioned
and complete to the extent that may facilities the Purchaser’s / Consultant’s approval in
conjunction with the drawing submitted earlier. Each set of drawing submitted for
approval shall be accompanied by detailed bill of quantities, materials specification, unit
and total weight. Submission of drawings and their approval within a stipulated period of
time as agreed shall be the responsibility of the Contractor. Purchaser’s / Consultant’s
approval of drawings shall be only in respect to reviewing the drawings for conformity
with the general requirement of the system. However, the approval shall not relieve the
Tenderer of his responsibilities/obligations with regard to adequacy of design, final fitment
of various parts, assemblies and satisfactory performance and operation.
The layout of the various equipment inside the pump house shall be designed by the
tenderer keeping in view the safety of the personnel, accessibility of equipment and
space for maintenance.
The Pump house shall be of civil construction, closed on all sides and shall be provided
with minimum two entries. One of the entries shall be provided with rolling shutters
having space provision of truck entry. Each pump house shall be provided with office
room and toilet facilities with drinking water provision. Equipment layout including design
load data, equipment foundation size, layout of pump house, details of electrics, cable
layout etc shall be furnished by the Tenderer.
Structural platform with ladder shall be provided so that the valves can be easily
accessible for operation and maintenance.
The sump/suction chamber shall be designed as per the standard of Hydraulic Institute.
Sump model tests shall be conducted, if necessary. The sump/suction chamber shall be
compartmentalized in a way to facilitate maintenance of any of the pumps’ suction valve
while ensuring running of all working pumps along with one reserve pump ready to
operate compartments with provisions to divert the entire flow from the cooling tower/
settling tank to either of the compartments when one of the compartments is under
repair/maintenance. Sluice gates shall be provided for isolation of the compartments. The
suction chambers / sump shall be provided with drain and overflow connections leading
to the nearest storm water drain.
The pump house shall be provided with proper ventilation, electrics, illumination,
instrumentation, telecommunication, wall clock and hoisting and handling equipment. The
control room and office room shall be air-conditioned
All the controls for the recirculation system and cooling tower shall be provided and the
control panel shall depict the working condition of various units.
The electrics of the pump house shall be designed as per the specification given in the
relevant chapter.
The capacity of the hoisting and handling equipment shall be selected in such a manner
that it is able to handle the single heaviest load. Cranes/monorails with hoist shall be
provided as indicated in the relevant chapter.
The pump house shall be provided with suitable ventilation facilities. The details of
ventilation shall be as per the write-up of air conditioning and ventilation described in
relevant chapter.
The pump house shall be provided with necessary illumination facilities along with
portable lamps. The details of illuminations have been given in the relevant chapter.
All pumphouses shall have a welding transformer and two (02) nos of 24V transformers
for head lamps.
The pumphouses shall be provided with a DN15 tapping of compressed-air for service
requirements. The compressed-air shall be tapped from the existing plant network with
due appurtenances viz- isolation valves at source and consumption point, strainers and
moisture traps etc.
The scheme of make-up water supply shall ensure maintenance of normal water level in
the sump and prevent wastage through overflow. Level switch shall be provided in the
sump which will actuate motor/solenoid operated gate valve on make-up water line to the
sump in order to maintain water level within a desired range. A bypass make-up water
line with float valve shall also be provided into the sump with isolating facilities. .
The pump house shall be provided with adequate drainage facilities with necessary side
slope, channels, etc. leading to drainage sump of suitable capacity.
The pump house sump shall be provided with low level alarm and the pumps shall be
provided with dry running protection.
Total no. of pumps for a particular group shall be selected in the following manners.
Total no. of working pumps for a particular group Minimum no. of reserve pumps
for the group
1 pump 2
2 to 3 2
More than 3 but less than 6 3
All the cold water and hot water pumps shall be of horizontal, centrifugal type and shall
have flooded suction. Each pump shall be complete in all respects comprising the
following:
Each pump shall have independent suction. The delivery line of each pump shall be
connected to the main header with isolating header gate valves for isolating pumps’
delivery valves; in case of space constraints butterfly valves may be used with
Purchaser’s / Consultant’s approval. The following flow velocities shall be maintained for
the pump suction and delivery branches.
Each pump shall be provided with a Gate Valve on the suction side and a non-return
valve and Gate Valve / motorized butterfly valves on the delivery side. Butterfly valves will
be employed for regulatory and auto-control usage; motorized gate valves shall be
provided in automated pumping system for pumps’ suction & delivery.
Each circulation system shall be connected with two nos. of delivery header from the
pumphouse. The water carrying capacity of each header should be such that incase one
of the headers is under maintenance the other header should be in a position to carry
required quantity of water to the consumers.
Each pump shall be provided with local indication of pressure on suction side and local
indication and signaling of pressure on delivery side
Each header shall be provided with suitable number of valves for isolating and
maintenance purpose.
Each header shall be provided with local indication of pressure and indication, recording
and signaling of flow and temperature, which shall be depicted on the panel of the control
room.
For drainage pumps two nos HSC, non-clog, self-priming centrifugal pumps of capacity
25 m3/h and adequate head with foot valve shall be provided. The pumps shall not be of
mono-block design. The drainage pumps shall operate automatically based on water
levels in the sump. The characteristics of the prime mover shall be same as described
under the main pumps.
For underground pumphouses one no. submersible pump of capacity 200 m3/h and
suitable head for draining out the pumphouse shall be provided additionally. It will be
connected to nearest storm water drainage system.
All the valves of diameter 450 mm and above and the valves requiring remote control
operation shall be electrically / pneumatically operated. Electrically operated valves shall
be provided with limit switches as a safety measure. Electrically operated valves shall
have provision for manual operation also. All Manual valves of sizes of 350 and above
shall be gear operated. Frequently operated delivery valves and header valves below
DN450 as specified by the Purchaser/Consultant during detailed engineering shall also
be electrically operated.
Dismantling / Rubber Expansion joints near the pumps on both suction and delivery lines
and compensators on the main header shall be provided wherever necessary.
Suitable chemical and biocide dosing facilities shall be provided in the suction chambers
of the pump houses so as to prevent biological growth, scale/ corrosion if any of the
circulating water system. The facilities shall consist of chemical storage tanks of suitable
storage time, dosing pumps (metering type) one working and one reserve. The dosing
system shall be complete in all respects with tanks, pumps, valves, supports, agitators
and necessary pipe-work. Adequate space will be provided in the pumphouse for
chemical storage.
The pipe network and valves within the pump house shall be adequately supported so as
to avoid undue stress on the pumps.
Minimum clear gap to be kept between equipment to equipment / pipe should be 1000
mm , between equipment to wall should be 2000mm and between valves to wall should
be1000 mm. If height of the equipment is more than 1 m minimum gap should be not less
than the height of the equipment.
The following interlocks shall be provided, as applicable, in the operation of all the
pumps, such that for the starting of any of the pumps:
• the level of the liquid in the pump house basin is higher than the low level,
• all the pumps shall be tripped when the low-low level is reached.
Wherever gravity drainage of premises is not feasible, suitable drainage pit shall be
provided for collection of drain and stray effluents. Minimum two drainage pumps as
specified above shall be provided for automatic operation based on the drainage pit
water level. The level control equipment for automatic operation shall consist of the
following :
a) level indication,
b) low level to stop the pump(s),
c) high level to start the first pump,
d) high-high level to start the second pump,
e) high-high-high level for alarm annunciation.
Individual storm water drainage network shall be provided. The storm water drainage
network shall be designed as a gravity network consisting of a combination of open
surface drains, storm water manholes and underground storm sewers, as required.
Storm water shall be collected in building apron side/ road side drain and shall be
conveyed by a gravity network into the plant storm water system of the Purchaser.
The hoists shall be designed in accordance with the latest edition of IS-3938-1983
standard subject to any modifications and requirements specified hereinafter. Hoist will
be operated by pendant push button station.
Power to the hoists shall be given by trailing cable arrangement running on inverted T
track. Inverted T track shall also be in the scope of the supplier. All trailing cables shall be
clamped with PVC or non-metallic Clamps. Safety chains shall be provided to connect
the trolleys & safety rope shall be provided to avoid tension of cable connected to
pendant push button station. Length of trailing shall be such that loop length shall not
exceed 1.5 m. in case of length of travel of the hoists will be more than 30 m
intermediate sockets shall be provided to reduce the length of cable.
Defects in the materials like fractures, cracks, blow holes, or laminations are not allowed.
All parts of the hoist shall be thoroughly cleaned of all loose mill scales, rust or foreign
matter & then painted. All parts inaccessible after assembly shall be painted before
assembly & assembled while paint is still wet.
ITEM NUMBER :
Location :
Capacity :
Duty classification :
Total weight of hoist including :
electrical equipment
Make of hoist block :
Speeds with safe working load
(hoist, lower &CT :
-Lifting height :
a) Above floor level :
Hoisting and handling equipment shall be provided for lifting individual loads weighing 50
kg and over.
The type of lifting device shall be selected based on amount of load to be lifted, height of
lift and frequency of operation and the layout of the equipment to be lifted. In general if
the load of be lifted is 1000kg or more and /or height of lift is 8m and more, electrically
operated handling equipment shall be provided.
For pumphouses of ETP of GCP of BF & BOF electric hoist of adequate capacity shall be
provided.
The single girder crane shall be designed, manufactured, assembled and tested in
accordance with IS:807/1990, IS:3177/1999, IS:3938/1983 and other relevant codes and
practices for the cranes to be used in steel plants, steel industry (IPSS) unless otherwise
stated. IPSS (wherever applicable) shall also be followed.
The tenderer shall furnish the following questionnaire duly filled along with the offer
i. Crane No.
ii. Nos. off
iii Type of crane
iv. Capacity (t)
v. Span (m)
vi. Duty class
vii. Location
viii. Hoists :
x. Bridge
a) General arrangement drawings showing to the scale plan, elevation and side view
indicating lifting capacity, height of lift speeds, wheel load, wheel base, over buffer
dimension hook approaches etc
Overhead tanks will be provided each at a suitable staging height for supply of
emergency water to critical consumers for a short duration in the event of interruption in
normal cooling water supply.
The overhead tanks will be multi-compartment type, each compartment serving
emergency water requirements of individual consumer. EOHT (emergency overhead
tanks ) will be partitioned to facilitate maintenance.
The filling of emergency water tanks for loss of water under normal operation and supply
of cooling water from the tanks under emergency conditions will be under automatic
control. Overhead tanks will be provided with overflow, drain and air vent connections.
Overhead tanks shall be provided with chequered plate stair case for approach to the top
of the tanks alongwith walkable platform all round the tank with hand railings.
The term pipe work referred herein generally cover pipes, fittings (such as bends, tees,
reducers, plugs, nipples, sockets, unions, flanges, crosses etc.)., valves of various types
and functions (such as gate, globe butterfly, plug, ball check, diaphragm, electrically
operated, pressure reducing valves, etc.) strainers, filters, hoses, hose couplings hose
clamps, hose nozzles, fire hydrant assemblies, pipe supports, corrosion protection etc.
Pipe work is intended to convey fluids such as different qualities of water and industrial
effluents.
The pipe work shall be designed, manufactured, assembled and tested as per the latest
standards, codes and recommendations of the Bureau of Indian Standards, ANSI, ASTM,
AWWA, or other equivalent international standards. Pipe work shall be complete in all
respects including all accessories essential for proper installation, operation and
maintenance, even though such items are not specifically mentioned in the specification.
Piping system shall be designed with high degree of reliability so that the systems
perform the duty of fluid handling without any failure under all conditions of plant
operation.
Piping layout must follow good engineering practice. Proper attention shall be given to
obtain full functional requirement of the piping system with a layout which provides
sufficient clearance for other equipment and operating personnel, easy access for
operation and maintenance, convenient supporting points and neat appearance.
Complete design of piping system shall be subject to approval by the Owner/ Consultant.
The design shall take into account the effect of internal/external pressure, thermal
expansion, self weight of piping, support reactions, surge and water hammer, earthquake
and wind effects at site, corrosion and erosion etc. and any other effects dictated by good
engineering practices.
Each consumer in a circulating system shall be provided with double header. Each
header shall be provided with suitable number of valves for isolating and maintenance
purpose. The delivery valves of the pumps should be able to be isolated for maintenance
by means of header valves without affecting the availability of other pumps. The Piping
systems shall not impose undue forces on equipment terminals.
Mild steel / Carbon steel pipelines shall be used in general for water supply facilities and
special quality pipes such as GI/ Cast Iron cement mortar lined DI for drinking and SS
pipes for soft / DM water, PVC/ MS rubber lined, HDPE Pipes for other corrosive fluids.
Material of pipes selected shall be indicated by the Tenderer in the offer and the same
will be subject to Purchaser’s /Consultant’s approval.
Pipelines shall be generally laid over ground on the structural trestles as far as possible,
wherever it is not possible pipelines shall be laid in tunnels /trenches/underground in this
order of preference. All openings in the piping shall be kept effectively closed until
assembled in the system to avoid foreign matter entering into the system.
As far as possible all the pipelines shall be laid together along the piping corridor. The
piping corridor shall be parallel to and by the side of roads.
The entire pipe network shall be provided with manually operated valves for
isolation/controlling purpose.
The pipe network shall be provided with air release valves at high points and drain valves
at the lower points.
All the pressure pipes shall be laid with a nominal slope and the gravity network with
slope of self-cleaning velocities.
Continuous welding MS pipes shall be used for water supply facilities and pipe flanged at
regular intervals and at bends shall be used for slurry and other corrosive fluid services.
For drinking water, screwed and socketed GI pipelines shall be used up-to 150-mm
diameter as per IS1239, P-1 heavy grade. For drinking water service for sizes more than
DN150 and for underground laying ductile iron pipe DI K-9 grade will be used.
Except where otherwise specified, all piping shall have butt welded connections with a
minimum of flanged joints for connections to equipment. Branches shall in general, be
formed by welding.
Provision shall be made for branches for cleaning and flushing of pipelines wherever
necessary.
Manholes shall be provided in the gravity pipe networks and the distance between two
manholes shall be 30m depending upon the pipe size.
Compensators shall be provided on the over-ground pipe network to take care of thermal
expansion. Compensators to be provided will conform to relevant IS/ IPSS.
Wherever over-ground pipelines are crossing roads and railway tracks, they shall be laid
on pipe bridges to provide the necessary clearance for the traffic movement. This should
take in to account the various type of vehicles likely to move in the plant.
Valves provided on the over-ground pipe network shall be provided with steel structural
platforms and access ladders.
Walkable platforms with necessary hand rails shall be provided by the side of overhead
slime troughs and open gravity network, wherever necessary.
Provision shall be made for support of piping which may be disconnected during
maintenance work. All large pipes and all long pipes shall have at least two supports
each arranged in such a way that any length of piping or valve may be removed without
any additional supports being required.
Pipe supports shall be capable of supporting the pipelines under all conditions of
operation.
All the buried pipelines shall be laid with a nominal slope towards the drain point.
All the buried pipelines shall be laid as far as possible at a depth of about 1200 mm,
below finished ground level (i.e. the top of the pipelines shall be 1.2 m below the finished
ground level).
Isolation /control valves drain valves, air release valve provided on the buried pipe
network shall be housed in suitably sized covered valve pit and the valve pits shall be of
self draining type. The valve-pits to be provided shall be after due approval b y
Purchaser/ Consultant. Air release valves shall be provided at the highest points of each
sector of the pipeline and drainage valves shall be provided at the lowest points of each
sector of the pipeline.
Wherever the buried pipelines are crossing the roads and tracks, they shall be suitably
encased with mild steel pipes or reinforced concrete casing pipes and the different sizes
of the encasing pipes shall be as given below:
Encased pipe diameter Encasing pipe ( For Encasing pipe (for welded
Flanged pipe) size (mm) pipe) size (mm)
In case a number of pipes are crossing road or track, these pipes shall be laid in a
reinforced concrete culvert having easy access.
Alternatively Coal tar based anticorrosion tape as per IS: 15337 – 2003 shall be provided
for protection of underground mild steel pipelines. The thickness of tapes shall be 3 mm
upto pipe diameter DN 300 mm and 4 mm above pipe diameter of DN 300 mm.
All buried pipelines shall be laid with earth cover sufficient to avoid damage from
pressure of vibration caused by the surface traffic. Minimum earth covering over the pipe
shall be 1200 mm from the finished ground levels. For laying of buried pipelines earth
work in excavation, back filling and acceptance of trenches etc. shall be as per IS: 5822-
1994 and IS: 3114-1994 and IS: 12288-1987.
The trench shall be so dug that the pipe line can be laid to the required alignment and at
the required depth, proper leveling of the excavated surfaces is an essential requirement.
If the depth of excavation is more, proper protection for side walls shall be provided till
the pipe leveling is completed.
The entire pipe trenches bottom shall be covered with local sand bed of 50 mm thick
layer.
After laying the pipelines, 150 mm thick layer of local sand shall be provided over the
sand bed.
In case stones, boulders etc. are found at the bottom of the trench which can not be
removed completely, the bottom shall be leveled by sand layer for a minimum thickness
of 150 mm.
Precautions shall be taken at all the times to prevent damage to the coating and
wrapping in the pipe lines and appurtenances as applicable by workmen or trespassers
during laying or at any other time. Pipe handling slung and any blocking used in handling
or storing the pipes must be well padded to avoid damage to pipe and its coating.
After laying a pipeline on skids it shall be thoroughly cleaned, inspected and for any
damage to the protective coating, satisfactory repair work shall be performed while the
pipe is suspended above the trench.
Before laying the pipelines, the trenches shall be examined by the Owner and after his
approval only the pipes can be laid.
After the pipes are erected and tested, the back filling of the trenches shall be done with
loose soil free from stones, bricks and metallic pieces, in layers and shall be well rammed
and compacted.
The underground pipelines shall be provided with pipe-m arkers at regular intervals to
facilitate identification.
RCC manholes with removable covers shall be provided for the buried gravity network
and the maximum distance between two manholes shall be 30 to 50 m depending upon
the pipe size. Manholes of adequate size shall be provided at all pipe junctions.
Where the pipelines cannot be laid overhead on stockades and are crossing roads and
tracks at too many points in a given area, the pipeline may be laid in walk-able tunnels.
Pipelines in tunnels shall be provided with isolating valves, air release valves and drain
valves, which are easily accessible for operation and maintenance. Gland type of
Compensators shall be provided on these pipelines wherever necessary.
Pipelines in tunnels shall be suitably ventilated and illuminated. There shall be minimum
two entries for the tunnel. Each tunnel shall be provided with at-least two vertical
centrifugal, non-clog type drainage pumps (one working and one standby) and these
pumps shall operate automatically based on the liquid levels. Each tunnel shall be
provided with at least a monorail and hoist for erection and maintenance purposes.
Minimum height of the tunnel shall be of 3.0 m and suitable walkway aisles shall be
provided for each tunnel.
Wherever pipelines are crossing form one bay to another parallel bay, they shall be laid
in tunnel or supported form the gable end.
D) Carbon Steel G.I (Galvanised Iron) Pipes DN 15 to DN 150 as per IS: 1239-
2004:
1. End condition : Screwed up to DN 50, Beveled ends for all the sizes above
DN 50.
2. Grade : Heavy
3. Material : Carbon steel, Gr. Fe 410
1. As per ASTM A 312 – Pipe, seamless ANSI B36.10, Schedule 40 (size 6mm-
200mm)
2. As per ASTM A 358 – Pipe, welded, ANSI B16.9, Class 3000, Schedule 40,
Sizes more than DN250
3. SS butt welding fittings: ASTM A403 WP304, ANSI16.9
4. SS socket welding fittings: ASTM A182 WP304, ANSI16.11
Note: Vertical pipe work shall be clamped at intervals of 3.5m (approx.) and at the base
of each riser. Maximum span at the place of turning shall be 0.7 times of normal span.
Tolerance on outside diameter of the pipe and specified thickness shall conform to the
limits laid down in IS:3589-2001. Finish pipe shall not deviate from straightness by more
than 0.2% of the total length.
Pipes to be butt welded shall be supplied with ends beveled to an angle of 30 degrees (+
5 degree – 0 degree) measured from a line drawn perpendicular to the axis of the pipe.
The root face shall be 1.6 ± 0.8 mm.
Following steps shall be taken by the Contractor, besides controlling quality in general, to
make effective control in carrying out welded joints.
a) Welding procedures shall be prepared in line with IS: 7307 (Part – I) – 1974,
reaffirmed in 1991 and tests shall be carried out to quality procedures. Number of
procedures will depend on variables like positions of welding, thickness range
etc. Once a welding procedure is qualified, strict adherence to it shall be made
during actual welding.
b) Welders employed shall be qualified as per IS: 7310 (Part – I) – 1974, reaffirmed
in 1987 after passing necessary tests.
d) The Contractor shall strictly follow approved welding procedures during actual
welding. Besides, the following stages of inspection shall also be carried out:
i) Weld edge preparation before welding, proper fit up, position of welding,
cleaning of slag between the passes, proper weld profile etc., shall be
checked visually amongst others.
ii) Non-destructive tests of weld of welded joints shall be carried out as per
approved procedures/ drawings.
Preparation of Joints
The Contractor shall prepare the edge correctly to the shape, size and dimensions of the
vee-grooves as per ANSI B-16.25 unless otherwise specified in drawings/ documents.
The welding surfaces shall be smooth, uniform and free from fins, tears, notches or any
other defect which may adversely affect welding and shall be free from loose scale, slag,
rust, grease, paint, moisture or any other foreign material. The clean surface shall extend
to about 10 mm beyond the welding faces to avoid contamination of the weld metal with
foreign material and to avoid unsound weld deposit.
The sequence of welding shall be so planned and followed that there shall be a balance
of welding about the neutral axis of the fabrication. The Contractor shall employ sufficient
number of welders working at the same time in diagonal quadrants of the shell using
back-step method of welding. The rate of progress of each welder shall be more or less
equal and quality uniform.
The general direction of welding shall be towards the free end of the joint, but in a long
joint as in shell fabrication, back-step technique shall be used to reduce distortion.
To minimize internal locked up stresses due to welding, the vertical joints for the shell
shall be welded and completed to a circular course and then the horizontal
circumferential seam welded. However, before the welding of horizontal seam started,
the complete circular course shall be aligned and adjusted for their correct axes.
Alternatively, the Contractor shall complete each course in all respect on ground and then
the pre-assembled course shall be listed and placed in position. In such a sequence and
planning, the same principle of balancing of weld about the neutral axis shall be followed
and the method of fabrication of each course shall be similar to fabrication of penstock
pipes of transmission/ industrial pipelines of bigger diameter.
Pipe and attachment shall be aligned properly by accurate and permanent methods prior
to welding. If tack welds are used, the tack shall be either fused into the first layer or weld
or else chipped out.
iii) Influx
iv) Burns
v) Under cuts
ix) Compression in welded joints as a result of electrode impact while carrying out
contact welding
The Contractor shall carryout any or all tests as specified hereinafter to satisfy the
Purchaser / Consultant about the acceptability of the welded joints, as directed by the
Purchaser / Consultant.
Liquid dye-penetrant tests shall be carried out in accordance with IS: 3658-1981,
reaffirmed in 1991 for surface/ sub-surface defects.
The surface of the weld shall be covered with soap solution consisting of one (1)
litre of water and hundred (100) grams of soap. Compressed air shall be blown
2
from the opposite side at pressure of 4 to 5 kg/cm . The distance between the tip
of base and the weld shall not be more than 50 mm. Any formation of soap
bubble will indicate welding defects. Portable compressor shall be arranged by
the Contractor, if necessary, for this purpose.
Tolerance
Deviations for assembly of welded joints may be permitted to the following extent:
a) Source butt-Joints
All the pumps provided in the pump house shall be horizontal centrifugal type with
flooded suction. For drainage pumps HSC, non-clog, self-priming centrifugal pumps of
capacity 25 m3/h and adequate head with foot valve shall be provided. The pumps shall
not be of mono-block design. As far as practicable, pumps of reputed indigenous makes
shall be preferred. Pumps shall be HSC SSSD type.
Vertical pumps shall be provided for power plant applications, pumps’ rotational speed
shall be 750 rpm (8-pole drive motor).
The slurry pumps for ETP of GCP of BF & BOFs shall be ESTD pump directly coupled
with motor. The drive motor shall be 4-pole motor. The bearings shall be oil-lubricated.
The horizontal pumps shall be mounted on a common base plate with the motor and shall
be directly coupled to the motor thorough a flexible coupling without any gear reducer. In
case of slurry pumps use of fluid coupling may be permitted.
The pumps (horizontal as well as vertical centrifugal) will be designed, manufactured and
tested as per IS:1520-1980, IS:5120-1977 R.A.1991, IS:9137-1978 R.A.1993 or as per
international standards acceptable to the Purchaser / Consultant and will be suitable for
the required duty conditions and capacities.
The pumps and their auxiliary equipment shall be suitable for the required duty conditions
and shall be designed and constructed for continuous duty at full load.
The centrifugal pumps shall be suitable for a capacity range of 25% to 125% of duty point
capacity.
The motor capacity shall have a margin over its BHP absorbed at the pump shaft at duty
point and the margin shall be 25% for motors of rating upto 15kW, 20% for motors of
rating 18.5kW to 160kW and 15% for motors of rating 200kW and above. The above
margin shall be in addition to temperature derating.
The pumps of kW rating more than 250 kW shall be of synchronous speed 1000 rpm/750
rpm. For pumps less than 250 kW motor rating, rpm shall not be more than 1500 (drive
motor shall be 4-pole motor) unless otherwise specified.
The equipment and auxiliaries shall be designed for quick and economical maintenance.
The equipment shall be easily dismantable without disturbing the suction and delivery
pipe connections.
The equipment design shall incorporate provisions for reduction in noise level.
The rotating elements of the pumps shall be checked for critical speed in bending as well
as in torsion. The critical speeds shall be at least 30% away from the normal speeds for
units with flexible shafts and at least 20% away from the maximum operating speed in
case of stiff shafts.
All passages inside the pump casing and impellers, which may be inaccessible to
machining, shall be ground to a smooth finish as far as practicable.
The direction of rotation shall be clearly marked either by incorporating it on the casing or
by separate metal plate arrow securely fitted to the casing.
• The pump flow rating shall have 10 % margin over the process flow value.
• Pump-motor shall be selected in such a way that tripping of a working pump will not
result in run-out condition and overloading of running pump-motor.
• The pump shall be so selected and installed that the available NPSH is not lower
than the required NPSH even in the most adverse operating conditions.
• The pump shall be of proven make and design having material of construction which
is the best of its kind for the particular application and shall be manufactured using
best engineering practices under strict quality control. Each pump shall be tested as
per the standards stipulated elsewhere in this document. The test shall include
hydrostatic test, static and dynamic balancing tests, performance tests material tests
and motor routine tests.
• The pump shaft and bearing shall be adequately sized to take the unbalanced forced
due to mal-operation. The pump gland shall ensure proper sealing without excessive
tightening of the packing. Proper cooling and flushing arrangement for the gland shall
be provided wherever required.
• All moving parts of the pump shall be adequately guarded to prevent any injury to
operating personnel.
• Pumps shall be designed and installed keeping in view the easy accessibility of its
parts for maintenance. All end suction pumps shall be of back-pull-out design and
shall be provided with spacer coupling of adequate length.
• Mechanical seals shall be provided at all pumps envisaged for closed loop circuit as
specified by the Purchaser/Consultant during detailed engineering. .
• Minimum no. of standby pump shall be provided for each group of clear water pumps
and drainage pumps as specified in the design criteria for pump house. The group of
Pumps for scale water or other abrasive slurries shall be provided with at least two
standby units. Special abrasion resistant material shall be used for these pumps and
the design shall allow easy replacement of parts subject to wear and tear.
• An isolating valve shall be provided on the suction line of each pump and another
isolating valve together with a non-return valve shall be provided at the delivery line
of each pump. Pressure gauges shall be provided at the suction and delivery flange
of each pump.
• The suction pipeline shall be laid at a constant down ward slope from pump centre
line to the suction chamber. Reducers used in the line shall be eccentric type to keep
the top of the suction line straight.
• Each pump shall be provided with adequate safety interlocks including overload and
dry running protection.
• Dismantling joints shall be provided on the delivery side of large size pumps to
facilitate quick maintenance, wherever required.
• All pumps shall be provided with suitable lifting attachments and each pump
installation shall have suitable handling facilities.
• A clear minimum gap of 800 mm shall be maintained between the pump and the
adjacent piping, other equipment or structures for proper movement. In case the
height of the top most part of the pump from the working floor is more than 1.0 m, the
minimum clearance shall be increased to 1000 mm.
• The details of pumps should match with the drive motors throughout the working life
of these equipments and to meet operational requirement. High-speed motors of
3000 rpm shall not be used for the cooling water circuit supply/return pumps, process
pumps, make-up water pumps, drinking water pumps, fire water pumps. . Working
hour meter shall be provided on control panels to monitor conditions and subsequent
ageing / reduced efficiency, etc.
• Pump casing shall be of robust construction and hydrostatically tested at 200% of the
rated pressure or 150 % shut off pressure, whichever is higher. The test pressure
shall be maintained for at least 15 minutes.
• The impellers along with any other unmachined rotating parts shall be tested for
proper balancing in order to avoid undue vibration during operation.
• Performance tests shall be carried on each centrifugal pump. Performance test shall
be made to determine the following.
• The pump accessories like bearings, couplings etc. shall be subject to shop tests as
per manufacturer’s standards.
• All test results and certificates including material test certificates shall be submitted
for approval to the Purchaser / Consultant before dispatch of equipment.
The vertical centrifugal pump sets shall be supplied with flange mounted vertical motors,
motor stool, base plate, coupling, column pipe, delivery pipe, suction strainer, companion
flanges, gaskets, bolts, nuts, washers, etc.
A stainless steel name plate shall be furnished and securely attached by stainless steel
pins at an easily accessible point on the pump. The plate shall be stamped with the
following minimum information: -
- Name of Manufacturer
- Model No.
- Motor rating, kW
For handling scale water and slurry water (ETP of GCP of BF & BOF) Ni hard impeller
and casing with SS shaft will be used.
The above MOC is for guidance, MOC of all pumps will be subjected to Purchaser’s
/Consultant’s approval during detailed engineering.
Vertical Turbine Pumps along with their auxiliary equipment shall be suitable for the
required duty conditions and shall be designed and manufactured for continuous duty at
full load.
The vertical turbine pump shall be designed, manufactured and tested as per IS: 1710 –
1989 (Reaffirmed 1999).
Vertical pumps are envisaged only as supply water pumps for Power and Blowing Station
(TBS & TGS), for such usage vertical pumps may be supplied with bearings submerged
in water.
The motor rating shall be maximum of the following requirements: -
a) 15% margin over the pump shaft input power at the rated conditions.
b) 5% margin over the maximum pump shaft input power required within its operating
range including the shut-off point.
Capacity Vs discharge pressure curve for each pump shall preferably be continuously
drooping from the shut-off point to the rated operation point and be suitable for parallel
operation. The pumps shall be designed to avoid cavitation at any of the operating points.
The characteristic of the pump shall be non-over loading type.
The required duty range for a pump shall be on stable portion of its head-capacity curve
close to the best efficiency point. The head developed at the best efficiency point shall be
close to the required differential pressure so that throttling is not required at pump
discharge.
The equipment and auxiliaries shall be designed for quick and economical maintenance.
The equipment design shall incorporate provisions for reduction in noise level.
The rotating elements of the pumps shall be checked for critical speed in bending as well
as torsion. The critical speeds shall be at least 30% away from the normal speeds for
units with flexible shafts and at least 20% away form the maximum operating sped in
case of stiff shafts.
The pumps shall be capable of reverse rotation upto 125% of rated speed due to reverse
flow of water.
All passages inside the pump casing and impellers, which may be inaccessible to
The direction of rotation shall be clearly marked on a separate metal plate arrow securely
fitted to the casing.
A stainless steel name plate shall be furnished and securely attached by stainless steel
pins at an easily accessible point on the pump. The plate shall be stamped with the
following minimum information:-
- Name of Manufacturer
- Model No.
- Motor rating, kW
Hydrostatic test shall be done for the following components at a minimum pressure of
200% of shut-off head. The test pressure shall be maintained for at least one hour.
(a) Bowl
(b) Suction bell
(c) Discharge head
(d) Column pipe
Performance test shall be conducted on each pump with one of the actual drive motors at
the manufacturer’s works in presence of Purchaser’s representative as per the
requirements of the relevant test codes.
Performance tests shall be conducted at rated r.p.m. to cover the entire range of
operation of the pumps. These shall at least cover the range from shut-off point upto 1.3
times the rated capacity of pumps. A minimum of 5 readings shall be taken for capacity-
vs-head, covering the above range. After performance test, the pump shall be dismantled
for inspection of internal components.
Mechanical run test shall be carried on all pumps to demonstrate smooth running of the
pumps, measurement of noise levels, vibration, etc. This test shall be carried out at site
also and the site test shall be taken for acceptance of the pump. The noise level shall not
exceed 85 dB at 1.0 m distance from the pump of as per the latest norm whichever is
less.
The pumps shall be tested for vibration at the guarantee points. Vibration limit shall be as
per Hydraulic Institute Standard/ API 610.
Test reports and manufacturer’s test certificates shall be submitted to the Purchaser/
Consultant for approval.
The final tests shall be conducted in the presence of the Purchaser’s representative. Test
certificates for different tests shall be made available to the Purchaser during the
inspection. Material test certificates for bought out items shall be obtained from original
manufacturer/ reputed test house. For all bought out items, test certificates as relevant to
the items shall be furnished by the Contractor.
All the pumps shall be subject to stage inspection by the Contractor’s own inspecting
authority. However, Purchaser’s Inspector may visit the works from time to time who
should have free access to all the places of the manufacturing premises where any part/
parts are under manufacture.
The Contractor’s inspecting authority shall have a close surveillance in respect of the
quality of job for the design dimensions, tolerances, surface finish, etc.
The Tenderer shall furnish the following documents along with the tender:
- Requirement of any utility services like gland sealing water along with
parameters.
- Time schedule in the form of a bar chart PERT network covering design to
delivery as specified in "Delivery Schedule".
- Speed vs. torque Characteristic curve for pump considering open valve condition.
- List of special tools and tackles, instruments and accessories required for
assembly and testing at site till preliminary acceptance.
- List of special tools, tackles and other accessories required for erection.
- List of all instruments, special tools and tackles and accessories required for
start-up, commissioning and establishing guarantee parameters.
- List of initial fill of lubricants, flushing oil and other consumables with quantities
- List of tests proposed to be done at shop and site before preliminary acceptance.
- Proposed test methods and standards to be followed for vibration and noise
measurement. A copy each of the standards shall be furnished.
- Inspection and testing procedure and details of shop tests for various
components, sub-assemblies or all the pumps and motors.
- All characteristic curves of motor including speed torque curve of the motor
- Terminal box GA drg. with details of cable size suitable for AYY type cable
termination.
b) Feed back data/drawings (Within four to six weeks after placement of order)
- Civil design data and drawings showing bolt hole locations, pocket sizes,
dynamic and static load, level of top of bolts and grouting thickness below the
base plate. The drawing shall indicate the level of base, position of anchor
pockets, inserts if any, to be embedded in the concrete and other details enabling
the Purchaser to design the civil foundation.
- Firm requirement of cooling and sealing water with max. and min. pressure along
with pipe connection size.
- Part nos. and description of spare parts.(within eight to ten weeks after
placement of order)
- As built drawings
- One set of reproducible and two copies of CD's all' As built drawings' for all
equipment shall be submitted along with 10 sets of prints (to be supplied at the
time of dispatch of equipment)
A) General
• The diesel engine shall be complete with all standard accessories, battery sets,
battery charger, instruments & control panel, base frame etc.
• The diesel engine shall be compression ignition mechanical direct injection type,
capable of being started by a battery powered electric starter motor, and shall
accept full load within 15 seconds from the receipt of signal to start.
• The diesel engine shall be natural aspirated, super charged or turbo charged and
either air or water-cooled. In case of charge air cooling by means of a belt driven
fan or of a belt driven auxiliary water pump, there shall be multiple belts such that
half the belts should be capable of driving the fan or pump.
• The diesel engine shall be capable of operating continuously (24 hours) on full
load.
• Any manual device fitted to the engine, which could prevent the engine starting,
shall return automatically to the normal position.
• Engines after correction for altitude and ambient temperature shall have bare
engine horsepower rating of 10% in excess of maximum horse power required to
drive the pump at its duty point.
• The coupling between the engine and the pump shall allow each unit to be
removed without disturbing the other.
B) Cooling System
• The engine shall be cooled by water from the discharge of the pump (takes off
prior to the pump discharge valve) direct into the engine cylinder jackets via a
• The discharge from the engine shall be collected and drained into the nearest
drainage channel.
C) Air Filtration
The air intake system ensures sufficient clean air to the engine. It shall incorporate the
suction air filter, which shall be of oil bath type to supply clean air to the engine.
D) Exhaust System
The hot exhaust gases shall be let-off with suitable system. All the hot parts located at
the working level shall be insulated. The exhaust system shall include:
• Exhaust manifold
• Silencer: The exhaust gas shall be let off through suitable silencer. The total back
pressure shall not exceed the engine manufacturer’s recommendation. Sufficient
length of straight pipe shall be provided after the exhaust silencer to leave the
gases at sufficient height above the engine and outside the engine room.
E) Fuel System
• Fuel for the engine shall be high-speed diesel oil as per IS : 1460 – 1974.
• Fuel tank and fuel feed pipe shall be provided for the engine.
• The fuel tank shall have the capacity sufficient enough to allow the running of the
engine at full load for 3 hours.
• The fuel tank shall be of welded steel construction. The tank shall be mounted
above the engine fuel pump to give gravity feed. The tank shall be fitted with a
level gauge calibrated in liters, filling in and cleaning hand holes, drain cocks, self
supporting from and connection to the engine fuel oil system.
• Valves in the fuel feed pipe between the fuel tank and the engine shall be placed
adjacent to the tank and they shall be located in open position. Plastic tubing
shall not be used.
• A duplex filter to suitable capacity shall be provided for the fuel feed pipe
between the fuel tank and fuel pump.
• Suitable sludge and sediment trap shall be provided for the fuel feeding system.
• The fuel tanks shall be supplied with hand pump for tapping the fuel tank from oil
barrel.
F) Lubricating System
• Sump: To store sufficient lube oil for circulation, suitable sump shall be located in
the engine.
• Pump: Suitable pump for forced lubrication.
• Filter
• Lubricating oil cooler
• Interconnecting piping & tubes in seamless construction.
G) Starting System
The engine shall be capable of manual starting by electric starter motor. Since the pump
driven by the diesel engine is not required to run continuously for long period and the
operation will not be frequent, special features shall be built –in the engine to allow it to
start within a very short period, even if it has been remained idle for a considerable long
period.
The engine shall be designed in such a way that is shall be started by one operator, if
necessary, without any preliminary heating of the combustion chamber. All
controls/mechanism, which has to be operated in the starting process, will be within easy
reach of the operator.
Automatic cranking shall be effected by a battery driven 24V DC motor having high
starting torque to have adequate ampere-hour capacity to provide the starting power for
the diesel engine. A control panel for starting of the engine through battery to be
provided. Engine START/STOP/TEST buttons shall be provided on control panel. The
battery capacity shall be adequate for ten (10) Consecutive starts without recharging with
a cold engine under full compression.
The battery shall be used exclusively for starting the diesel engine and kept fully charged
all the time. Arrangement for both trickle and booster charge shall be provided. However,
when the engine starts or is running, provision shall be kept to ensure that the charger is
automatically disconnected and the battery is charged by the engine dynamo. At no times
it should happen that the battery gets disconnected and is not available to start the
engine.
The charger shall give constant D.C output voltage irrespective of incoming voltage
variation specified. The charger shall be with fully controlled bridge circuit with diodes.
H) Governing System
The governor shall be fitted with a speed control device, which will control the speed
under all conditions of load.
I) Foundation Frame
Suitable foundation frame with foundation bolts & nuts shall be provided.
J) Instruments
The equipment shall be provided with necessary instruments to check the working of the
engine continuously. The following instruments shall be minimum which will be provided
and the same shall be fixed on a common instrumentation panel mounted directly on the
engine base frame :
The pressure and temperature gauges shall be of reputed make. The following
protections annunciation also shall be provided.
Any other instrument, control and protection equipment required for the safe operation of
the engine shall also be provided.
All the pressure gauges, pressure transmitter, pressure switches etc. where viscous fluid
enters inside the instruments shall be provided with diaphragm sealed flanged process
connection with flanged isolation valves.
The bidder shall furnish the list of spares & special tools including the following
mandatory spares, in their scope of supply.
In addition to the above, the bidder may include any other spare parts and special tools
for maintenance/re-erection of the diesel engine/pump.
Engine will be tested at test bed as per relevant standard as per details given below.
1. Before engine testing following details shall be recorded on engine test report.
2. Start the engine and run at idle speed for some time.
3. Raise the load gradually and allow the performance parameter to reach steady
state condition. Check power out put at full throttle as per specification and adjust
if necessary. Note down following parameters on engine test report.
• Time
• RPM
• Torque (N-M)
• BHP (Calculated)
• Fuel Pressure
• Fuel Rate
• Lube Oil Pressure
• Lube Oil Temperature
• Water Temperature
• Exhaust Temperature
• High Idle RPM
• Low Idle RPM
• Corresponding Lube Oil Pressure
@ High Idle and Low Idle RPM
• Governing %
i) Raw materials identification and physical and chemical test certificates for all
materials used in manufacture of the equipment/pipe.
ii) Static/dynamic balancing certificate for rotating components/machines.
iii) Pressure test certificates.
iv) Performance tests certificates for all characteristics.
4.05.01 DATA SHEET FOR DIESEL ENGINE TO BE FURNISHED ALONGWITH THE OFFER:
S.No. Description
3. Rated Speed
6. No. of Cylinders
7. Swept Volume
13. Battery
a) Quantity
b) No. of Cells per Battery
c) Nominal voltage per cell
d) Battery output voltage
e) Battery charger details
The successful tenderer shall submit six copies of the following documents for Owner’s
approval before procuring the equipment and shall also submit six copies of the
approved documents for final distribution.
practical, complete and comprehensive manner prepared for use by operating and / or
maintenance personnel.
A parts list shall be included showing nomenclature, manufacturer's part no. and/ or
other information necessary for accurate identification and ordering of replaceable parts.
Instructions and parts list shall be clearly legible and prepared on good quality paper.
Instruction manuals shall be securely bound in durable folder.
If a standard manual is furnished covering more than the specific equipment purchased,
the applicable model (or other identification) number, parts number and other
information for the specific equipment purchased shall be clearly identified.
The cooling towers shall be multi-cell mechanical induced draft type (cross flow/counter
0
flow type). The design wet bulb temperature of the site is 29 C. The approach of cold
water to design wet bulb temperature shall be fixed based on the requirements.
The cooling towers shall be located near the re-circulating water pump house with
necessary clearance from the adjoining structures and communication facilities.
The number of cells in each cooling tower shall be selected in such a manner that one
no. of cell is spare and can be taken out for maintenance.
The cooling towers and the accessories shall be designed and constructed in accordance
with the latest applications provisions of Indian or International Standards in general and
the following in particular.
PTC – 23 “ASME Performance Test Code for “atmospheric water cooling equipment”.
Cooling tower institute of USA, Bulletin, ATP - 105 for “Acceptance Test Procedure”
The towers shall be designed to withstand the wind load and seismic load for the site.
The tower layout shall facilitate location of fan drive motor on that side of the cylinder
which will be upwind most of the time.
The cooling towers shall be complete in all respects and shall broadly conform to the
following requirements:
The cooling tower basin shall be of RCC construction and shall be constructed by the
Contractor. The capacity of the basin shall be designed for approximately 10 minutes
circulating water quantity. Each basin chamber shall be provided with a sludge pit with
isolating valve complete with extended spindle and head stock. Each basin chamber shall
be provided with an overflow of suitable chamber there shall be a cold water outlet sump.
In the connection between basin chamber and outlet sump, there shall be double
screens, with galvanized angle frame and SS screen complete with lifting arrangement.
for each cell.
Fan decks shall be provided with drainage away from the fan cylinder and shall extend
the full width of the cooling tower covering the water distribution system. The fan cylinder
shall be of RCC construction and shall be of velocity recovery venturi design. For ACVS
usage FRP package cooling towers may have FRP fan cylinder.
The cooling tower shall be provided with a RCC stairway located at one end and cat
ladder at another end of the tower for access from ground level to the fan deck. The
tower will be provided with one or two longitudinal walkways, with handrails located at the
cooling tower basin curb level.
The tower shall be provided with complete water distribution system including piping, flow
control valves and distribution nozzles. Header isolating valves for the tower and water
distribution valves for each cell shall be provided.
The tower shall be equipped with suitable material handling devices of appropriate
capacity for removal and handling of equipment from the fan deck to the ground level.
For cooling tower manual under-slung cranes with CT & LT shall be provided complete
with parking shed. Height of lift shall be adequate to lift/place material from the
deck/ground. Crane and structural members shall be suitably treated/ galvanized for
corrosion protection.
Each fan assembly shall be provided with vibration limit switches to de-energize the
motor in the event of excessive vibration.
Local Start / Stop switch with protection from moisture shall be provided at the top of
cooling tower.
Cooling tower fan shall be energy efficient type, multiple axial flow type, specially
designed for low noise level and vibration free operation. The bolts, nuts and other
hardware used for fixing the individual blades to the fan hub shall be selected with min.
15% margin over the power required at motor output terminal for the duty conditions.
Cooling tower fan shall be driven through right angle heavy duty, industrial type reduction
gear assembly. Reduction gears shall be of oil bath, positive lubricate type, specially
designed for service factor of 2 over fan rated brake power.
The drive shaft shall be designed for high safety factor and the drive shaft assembly shall
be statically and dynamically balanced.
The fill and eliminators shall be built and arranged to permit ease of handling and
removal form the tower. The fill and eliminator members shall be securely retained in
position to prevent excessive sagging or falling out of position. All fill supports shall be of
ample size to properly support their respective loads.
Proper illumination facilities for the fan deck and stair cases shall be provided apart form
are illumination. Cooling tower fan controls shall be located in the pump house.
If the quality of blow down water is not within the statutory limits for disposal, the same
shall be treated prior to discharging into storm sewer.
i. Bevel protector with spirit level for blade pitch angle adjustment
ii. Drive shaft alignment kit with dial indicator kit.
iii. Hydraulic hub puller for hub removal of fans.
iv. Torque wrench for fan blade clamping.
Spares to be considered per cooling tower: fan blade assembly (one set), floating shaft
with coupling (one set), gearbox (one no.), spray nozzles (10% for one cell for each
tower).
Sl
Component Material recommended
No
1 Basin R.C.C.
Sl
Component Material recommended
No
6 Drift eliminator AC sheet/ PVC
7 Fan blades FRP/Aluminum Alloy
8 Spray nozzles polypropylene
9 Fan hub MS Galvanised with GRP cover
10 Drive shaft SS- 304
11 Fasteners and hard wares SS (AISI 304)
12 Base frame for motor MS Galvanised
Sl
Component Material recommended
No
1 Structural members / H.D.G. Steel
Supports
2 Casing / Cladding Fiber glass reinforced polyester (FRP)
3 Fill PVC
4 Drift eliminator PVC
5 Louvres PVC / FRP
6 Cold water basin RCC
7 Hot water distribution PVC pipe with polypropylene nozzles /
system FRP basin with replaceable polypropylene
nozzles installed in the basin floor.
8 Access ladders HDG
9 Fan blades FRP / Cast Aluminium
10 Fan guard G.I. wire
11 Fan hub HDG Steel / Aluminium
12 Fan drive shaft HDG Steel
13 Hard wares / Fasteners SS.034
14 All other steel and iron HDG Steel
parts except distribution
valves and gear cases
• G.A drawing for cooling tower incorporating principal dimensions, battery limits,
basin details indicating overflow and de-sludging arrangement, positions of sluice
gates and screens in outlet channel and material handling facilities at fan deck
level.
• List of local control boxes and push button stations indicating the devices
mounted and their specifications.
• The list of spares for two years normal operation and the list of special tools and
tackles required for erection, testing and commissioning and subsequent
maintenance along with item-wise price..
i) Detailed design calculations for tower sizing, fan motor sizing calculations, etc.
ii) QAP of various equipment
iii) G.A and schematic view of cooling tower
iv) G.A of fan deck slab
v) C.S and longitudinal section drawing of cooling tower
vi) G.A of fan cylinder
vii) Schedule of complete electrical equipment/ devices with specifications
viii) Fan motor data sheet and G.A of motor
ix) Layout drawing showing location of all electrical equipment / field devices.
x) Illumination, cable and cable supporting structures layout plan and sections
drawing.
xi) Earthing layout drawing with bill of materials.
xii) Cable schedule indicating cable number, point of origin, point of termination,
type, size and length of power and control cable.
xiii) Terminal wiring and external cable connection diagrams.
xiv) Detailed design calculations for civil works of cooling tower and civil construction
drawings.
D) For Reference
A) The heat exchanger unit shall consist of gasketed plates supported in frame capable of
being opened and closed. The frame provides structural support as well as pressure
containment for the gasketed plates and consists of frame plate, pressure plate, guide
bar & carrying bars, closing studs/nuts and carrying bar supporting columns.
Wherever Plate Heat Exchangers are envisaged, one number Plate Heat Exchanger
should be installed in addition to the required number of Plate Heat Exchangers.
B) The frame shall be designed to permit future installation of 30% additional plates.
C) The heat exchangers shall be designed and supplied for 110% of the design flow
requirement of the respective cooling water circuit.
D) Each plate heat exchanger shall be designed for full pressure in each stream having no
pressure on other stream.
E) While designing heat exchange area and number of plates, cleanliness factor on account
of fouling shall be considered as 20%.
F) Carbon steel components in contact with fluid system shall have a corrosion allowance
of min 3mm. All the threaded hardware items like studs and nuts shall be zinc coated.
H) Frame plate in the primary stationary end of the plate heat exchanger. All nozzles shall
be located on frame plate.
I) Inspection openings shall be provided on the pressure plates. These openings shall be
blanked by providing blind flanges. Ball valves shall be provided on the bottom blind
flanges for drain purposes. Handles are to be provided on all the blind flanges.
J) All nozzles on the frame plate and inspection openings on pressure plate shall be
provided with stainless steel sheet lining conforming to AISI 316.
K) Pressure plate shall be supported in a roller bearing hanger from the carrying bar.
Pressure plate shall move along the carrying bar and shall be guided by the guide bar.
L) The carrying bar shall be welded to the frame plate and carrying bar support column. A
stainless steel tee section shall be welded to the carrying bar to provide mounting
member for the plates of the plate pack. A smooth surface shall be provided for roller
bearing carrying groove for the whole length of the carrying bar. Carrying bar shall be
designed to support 1.5 times the weight of the flooded exchanger along with pressure
plate, tie rods, nuts and nozzles.
M) Guide bar shall be welded to the frame plate and carrying bar supporting column. It shall
be sheathed in stainless steel on the 3 surfaces coming in contact with the plates and is a
guide bar only for the plates.
O) Carbon steel boiler quality plates shall be as per SA 515/516 Grade 60.
Q) The heat exchangers shall be designed, manufactured and tested as per ASME code
Section VIII, Div. 1 and shall be suitable for the duty conditions and capacities as
required.
R) The plate heat exchangers along with their auxiliary equipment shall be suitable for the
required duty conditions and shall be designed and constructed for continuous duty.
S) The equipment and auxiliaries shall be designed for quick and economical maintenance.
The equipment shall be easily dismantled without disturbing the inlet and outlet pipe
connections.
T) Stainless steel name plate shall be furnished and securely attached by stainless steel
pins at an easily accessible point on each plate heat exchanger. The plate shall be
stamped with the following minimum information:-
• Material test
• Dimensional checking
• Hydrostatic tests
• Ultrasonic test for the plates used for frame and pressure plates.
b) All the plate heat exchangers shall be subject to stage inspection by the successful
tenderer's own inspecting authority. However, Purchaser's Inspector may visit the works
from time to time who shall have free access to all the places of the manufacturing
premises where any part/parts are under manufacturer.
c) The successful tenderer's inspecting authority shall keep a close surveillance in respect
of the quality of job for the design dimensions, tolerances, surface finish etc.
d) Before giving call for final inspection, all the documents shall be furnished to the
Purchaser. The record of manufacturing details, inspection and tests carried out by the
successful Tenderer shall be made available to the final Inspecting Authority. However,
approval and final inspection at the manufacturing works shall not relieve the successful
Tenderer of responsibility of replacing at his cost any defective part/material which may
be detected by the Purchaser during erection and commissioning or guarantee period.
e) Hydrostatic test shall be carried out at 1.5 times the design pressure maintaining test
pressure for a minimum of 60 minutes. Testing shall be done by pressurising each side
separately.
f) The final tests shall be conducted in the presence of the Purchaser's representative. Test
certificates for different tests shall be made available to the Purchaser. Material test
certificates for bought out items shall be obtained from original manufacturer/reputed test
house. For all bought out items, test certificates as relevant to the items shall be
furnished by the successful Tenderer before the equipment is offered for final inspection.
f) Wherever required, all tests shall be done as per relevant Indian Standards. In the
absence of the Indian Standard, the equivalent internationally reputed standards shall be
followed.
6.03 PAINTING
a) Surface of the heat exchanger frame work shall be cleaned to near white metal
conforming to Sa 2 1/2 of Swedish Std. SIS 055900 or German Std DIN 55928 (Part-4)
b) After surface preparation, the plate heat exchanger shall be painted as per the
manufacturer’s standard.
Acceptance tests shall be carried out by the successful Tenderer after commissioning.
These tests shall be performed according to code of practice of HEI of USA or other
mutually agreed procedure in the presence of Purchaser's representative. All instruments
required for the test shall be arranged by the successful Tenderer. In Case during the
tests the heat exchanger performance falls short of guarantee figures, the successful
Tenderer shall bear all expenses of improving the performance of the heat exchanger
and shall carry out another acceptance test at no extra cost. In case the performance is
again unsatisfactory, the successful Tenderer shall be liable to replace the subject
equipment by new and better equipment at no extra cost without affecting the overall
schedule of the commissioning of the Main Plant.
6.05 GUARANTEE
a) All equipment shall be guaranteed for good workmanship, no material defect and the
design parameters for a period as per Contract Agreement.
b) The successful Tenderer shall stand guarantee that the heat exchanger shall cool the
required quantity of primary water with the specified quantity of secondary water to the
temperatures stipulated in Annexure A of this technical schedule. The successful
Tenderer shall also guarantee the agreed pressure drops across the primary &
secondary sides of heat exchanger. In addition, all items of the heat exchanger are to be
guaranteed in respect of material and workmanship. Any defects found during warranty
period shall be rectified to the complete satisfaction of the Purchaser / Consultant at the
successful Tenderer's cost.
6.06 PENALTY
a) No negative tolerance on the "Overall heat transfer coefficient" of the plate heat
exchangers shall be permitted.
b) For every 1% shortfall in the overall heat transfer coefficient, 1% contract value shall be
levied as penalty. This shall be applicable for the overall heat transfer coefficient up to
95% of the guaranteed value.
c) For overall heat transfer projection less than 95% of the guaranteed value, the heat
exchangers shall be rejected.
d) No positive tolerances on the pressure drop in the heat exchangers shall be permitted.
e) For every 1% increase in the pressure drop, penalty at the rate of 1% contract value shall
be levied. This shall be applicable for the pressure drop upto 5% above the guaranteed
value.
f) For pressure drop of more than 5% of the guaranteed value heat exchangers shall be
rejected.
g) Guaranteed overall heat transfer coefficients offered by the successful Tenderer shall
hold good if the variation in the flow rates is within + 2O% of the flow rates.
The Tenderer shall furnish the following documents along with the offer :
• Catalogues for the plate heat exchangers duly identifying the model.
• List of special tools, tackles and accessories required for assembly, erection, testing,
start-up and commissioning.
• List of minimum commissioning spares that will necessarily be supplied along with
the equipment.
7.01 Two-Stream fully automatic PLC controlled soft water plant of 100% capacity each shall
be provided with requisite controls & instruments for auto operation of the plant.
Necessary effluent treatment shall be provided. The treated water shall be disposed off to
drainage system. The prevailing pollution control acts shall be binding for selection,
erection and operation of these units.
7.02 The scope of work of the tenderer also includes the following items for each of the
softening plant as specified below:
7.02.01 Initial fill of oils, lubricants, consumables, filter media, resins for all exchangers, degasser
tower packing, chemicals & reagents and supply of commissioning chemicals as
applicable shall be included in the scope of supply of the Tenderer.
7.02.02 The scope of supply of the Tenderer also includes supply of Laboratory test kits for
measuring hardness, chlorides, TDS and pH.
7.02.03 Softening of water shall be necessarily by the ion exchange method. Hot cold lime
softening shall not be acceptable.
7.02.04 Scope of work of the Tenderer includes Air blowers, frontal piping, Pipe headers,
Pneumatic operated valves, Requisite no. of companion flanges, Gaskets, Bolts, Nuts &
washers, Foundation bolts, Electrics, Instrumentation, Pipe supports, Initial fill of filter
media.
7.02.05 The accessories to be supplied are Brine saturator (15 days capacity) , Brine measuring
tank ,Ejector, Frontal piping, Piping headers, Valves , Requisite no. of companion
flanges, Gaskets, Bolts, Nuts & washers, Foundation bolts, Instrumentation, Pipe
supports etc. Initial fill of resin.
7.02.06 Carbon steel plates as per SPM A285.C.or ASTM A515 Gr. 55 to 70 or IS:2002 Gr. 2a
0 0
can be used for the temperature range of (-) 29 C-200 C.
7.02.07 Structural steel as per IS:2062 may be used for thickness above 20 mm and as per
IS:226 St 425 for thickness up to 20 mm
7.02.08 Piping material shall be as per ASTM A- 106. ASTM A-53 or API-5L may be used for
internal piping
Following drawings and documents shall be submitted by the tenderer for Instrumentation
system:
• Time schedule in the form of a bar chart / PERT network covering design to
delivery as specified in “Delivery Schedule”.
• Catalogues for each equipment duly identifying the mode.
• List of special tools, tackles and other accessories required for erection.
• List of all special tools and tackles and accessories required for start-up,
commissioning and establishing guaranteed parameters.
• List of initial fill of lubricants, flushing oil and other consumables with quantities.
• List of tests proposed to be done at shop and site before preliminary acceptance.
• Proposed tests methods and standards to be followed for vibration and noise
measurement. A copy each of the standards shall be furnished.
• Indicate whether equipment will be delivered completely assembled or whether it
will be assembled at site.
• If assembly is at site, proposed number of sub-assemblies and packages.
• Estimated duration for erection of equipment under each stage.
• Recommended no. of the Contractor’s supervisory personnel and duration of their
stay at site required for supervision of erection of equipment under each stage.
• Process and instrumentation (P&I) diagrams indicating all field and panel mounted
instruments using ISA symbols and using suitable tag numbers against each
instrumentation equipment. Alarm and interlock functions shall also be indicated in
the P&I diagram.
• List of analog, digital inputs & outputs alongwith numbers of control loops (P+I+D)
to be considered in PLC.
• Single line power supply diagram for instrumentation equipment, indicating total
quantity and quality of power requirements, area wise.
a) Numbering system and list of all drawings/data along with schedule Within 2
of submission weeks
instruments.
- Single line power and air supply diagrams with specification and
bill of quantities of electrical and pneumatic accessories.
- G.A and Wiring diagram and terminal plan for Junction box .
- I/O List
- Technical particulars
- Catalogues/literatures
7.04 PENALTIES
7.04.01 Pumps
During testing each pump along with its auxiliaries shall be tested to establish the
following performance guarantee parameters:
b) Energy consumed as measured at motor control centre for each pump for the
above conditions shall not exceed the values quoted during the tender stage.
d) Vibration level of pump measured throughout the regime of pump operation shall
be in accordance with the specified international standards.
• The minimum depth of filtering media bed shall be 1.2m. Atleast 60 % of free board shall
be provided the filtering media bed.
• Backwash cycle for each filter shall be generally once in every 24 hours. However, the
same shall be commensurate with other vessels employed in the system.
• Pressure filters shall be provided with access manholes of minimum 500 mm size for
enabling the filling and changing of gravel, sand and for maintenance purposes. Suitable
Platform with access ladder for easy entrance into manhole shall be provided.
• Maximum pressure loss across the filters should not be more than 5 mWC.
• Quality of outlet water shall be such that suspended solids content should not exceed 5
ppm.
b) Filters delivery the filtered water containing suspended solids (scale) upto 5 ppm
are acceptable without penalty.
c) Filters delivering the filtered water containing suspended solids (scale) in the range
of 5 to 10 ppm are acceptable with penalty.
d) The penalty shall be levied at the rate of 1% of the contract value of filters for every
1ppm increase of suspended solids (scale) in filtered water beyond 5 ppm.
e) Filters delivering the filtered water containing suspended solids (scale) more than
10 ppm are not acceptable.
c) Filters delivering the filtered water containing suspended solids (scale) in the range
of 2 to 4 ppm are acceptable with penalty.
d) The penalty shall be levied at the rate of 1% of the contract value of filters for every
1 ppm increase of suspended solids (scale) in filtered water beyond 2 ppm
e) Filters delivering the filtered water containing suspended solids (scale) more than 4
ppm are not acceptable.
d) The penalty shall be levied at the rate of 1% of the contract value of the softening
system for every 1 ppm increase of total hardness in softened water beyond 5
ppm.
e) Softening system delivering the softened water containing total hardness more
than 10 ppm is not acceptable.
Two-Stream fully automatic PLC controlled DM water plant of 100% capacity each shall
be provided with requisite controls & instruments for auto operation of the plant.
Necessary effluent treatment shall be provided. The treated water shall be disposed off to
drainage system. The prevailing pollution control acts shall be binding for selection,
erection and operation of these units.
The regeneration cycle and back washing cycle shall be at an interval of 20 hours. Water
required for internal consumption like regeneration, back washing etc. shall be additional
to the capacities indicated above.
DM Plant shall be installed in an covered RCC building. The operation of DM Plant shall
be designed to run on fully automatic operation basis.
Water from the makeup water system of the plant shall be considered as the source of
raw water for DM Plant.
Water from clarified water storage tank shall be pumped into the activated carbon filter for
removal of excess chlorine, oil, colour and traces of iron and organic.
Filtered water from activated carbon filter shall flow into cation exchanger where all
positive ions shall be removed. The water from the cation exchanger free from positive
ions shall flow into the degasser where air shall be blown to remove CO2. The degassed
water shall be stored in a degassed water storage tanks.
The degassed water from the degassed water tanks shall be pumped into the anion
exchangers where all negative ions shall be removed. The water from the anion
exchangers shall flow into the mixed bed for the removal/polishing of the remaining
positive and negative ions. The DM water from the mixed bed shall flow into the DM
water storage tanks. From the DM water storage tanks, the demineralised water shall be
pumped upto the battery limit. DM water pH correction shall be automatic. Conductivity
comparator, ph meter shall be on-line.
Acid/alkali unloading pumps/with necessary pipes, hoses and valves from road tanker to
storage tank shall be provided.
Resin traps shall be provided on the pipeline at the outlet of each exchanger. Media traps
shall be provided on the pipeline at the outlet of each activated carbon filter.
Panic showers, washing facilities and drinking water pipeline connection for laboratory
and other units shall be provided.
The DM Water Plant shall be complete in all respect. The design and constructional
details of various equipment are given below:
Make up/ clarified water shall be received by gravity/ under residual head in a RCC water
tank having 2 compartments. Each tank shall have inlet, outlet, overflow, drain
connections with necessary level indicators, isolation valves and pipes, etc.
The activated carbon filters and the connected equipment shall be designed,
manufactured and tested as per relevant IS or as per other international standards
acceptable to the Purchaser / Consultant and shall be suitable for the input water quality.
The vessel shall be of vertical type and be provided with built in legs. The pressure filter
shall be provided with
i) Piping system and control valves in front of the vessel for smooth operation. It
shall include raw water inlet, filtered water outlet, back wash water inlet, drain
connection, air inlet and air vent.
iii) Sampling points with isolation valves for inlet and outlet connection.
iv) Under drain system shall be header lateral type or strainer on plate design. In
case of strainer on plate design, access shall be provided below the bed plate.
No sub-fill shall be used in case of header lateral design. Minimum bed depth
shall be 1200 mm.
v) Proper distribution system for Raw water inlet and Back washing to avoid
channeling and clogging.
vi) Access manholes shall be provided and size shall be of 500 mm dia min.
x) 2 coats of epoxy based primer and 3 coats of solvent free epoxy based finishing
paint shall be provided inside the pressure filter. The dry film thickness shall be
200 microns.
xi) At least 75% (of bed depth) freeboard shall be provided to allow expansion of the
bed during back washing.
xii) An orifice board for indicating the wash water flow. It shall be fitted in the drain
sump.
The vessel shall be of vertical type and be provided with built in legs. The design of the
vessel shall be as per ASME SEC-VIII, DIV.1. The design surface flow rate shall not
3 2
exceed 40 m /h/m .
The cation exchanger shall be painted outside with protective paint and rubber lined from
inside. Sand blasting of the vessel shall be done before rubber lining. The Natural Rubber
Lining shall be minimum 4.5mm thick and shall have a shore hardness of 65 + 5 Deg.
(scale -A)
i) Access manholes for filling, changing of resin and also for maintenance purposes
and transparent windows for knowing the level of resins.
ii) An internal collecting system for withdrawing the cationic/ softened water. The
iv) At least 80% free board shall be provided to allow expansion of the bed during
back washing/addition of extra resin.
vi) The collecting system as well as the distributor shall function in the reverse way
during back washing.
viii) An orifice board for indicating the wash water flow. It shall be fitted in the drain
sump.
xiii) The piping system and control valves in front of the vessel for smooth operation
8.01.04 Degasser
i) The degasser shall be forced draft, counter flow type with polypropylene fill
complete with staircase etc.
ii) The degasser shall be fitted over the degassed water tank and it shall be air tight.
iii) It shall be fitted with sprayer at the top for proper spraying of cationic water. An
air vent shall be provided at the top for removal of CO2. The inlet distributor shall
be of header lateral system. Material of construction for degasser shall be carbon
steel as per IS:2062-1992 .The degasser shall be lined on the inside surface with
natural rubber lining (4.5mm thick) and the outside surface shall be painted with
chlorinated rubber paint. The tower hood should be of stainless steel. Air duct
from blower to degasser shall be of FRP.
iv) The degasser shall be fitted with connections for blowing air. It shall be complete
in all respects. (Blowing rate shall be furnished).
v) Sump level control shall be for dry running protection of degasser pumps.
i) The degassed water tank shall be horizontal cylindrical shell type with dished
ends. The design code shall be ASME SECTION -VIII.
ii) Material of construction for degassed water tank shall be carbon steel as per
IS:2062-1992 .The tank shall be lined on the inside surface with natural rubber
lining (4.5mm thick) and the outside surface shall be painted with 3 coats of
iii) It shall be suitable for mounting on concrete supports. It shall be fitted with inlet,
outlet, overflow and drain connections with necessary level indicators, valves and
pipes. The capacity of tank shall be as per system requirement and approval of
Purchaser / Consultant.
The vessel shall be of vertical type and be provided with built in legs. The design of the
vessel shall be as per ASME SEC-VIII, DIV.1.
The anion exchanger shall be painted outside with protective paint and rubber lined from
inside. Sand blasting of the vessel shall be done before rubber lining. The Natural Rubber
Lining shall be minimum 4.5mm thick and shall have a shore hardness of 65 + 5 Deg.
(scale-A)
v) The collecting system as well as the distributor shall function in the reverse way
during back washing.
vii) An orifice board for indicating the wash water flow. It shall be fitted in the drain
sump.
xi) The piping system and control valves in front of the vessel for smooth operation.
The vessel shall be of vertical type and be provided with built in legs. The design of the
vessel shall be as per ASME SEC-VIII. DIV.1.The design surface flow rate shall not
3 2
exceed 60 m /h/m .
The M.B. exchanger shall be painted outside with protective paint and rubber lined from
inside. Sand blasting of the vessel shall be done before rubber lining. The Natural Rubber
Lining shall be minimum 4.5mm thick in three layers and shall have a shore hardness of
65 + 5 Deg. (scale-A)
i) Access man-holes for filling, changing of resin and also for maintenance
purposes and transparent windows for knowing the level of resins.
ii) An internal collecting system for withdrawing the water. The strainers shall be of
good quality stainless steel. In case of strainer on plate design, access below the
bed plate shall be provided.
iii) At least 100% free board shall be provided to allow expansion of the bed during
back washing/addition of extra resin.
iv) Distributor for distributing alkali and separate distributor for distributing acid.
vi) The collecting system as well as the distributor shall function in the reverse way
during back washing. The resins shall be supported on a layer of graded
pebbles.
vii) Built in legs with proper supports to the concrete base
viii) An orifice board for indicating the wash water flow. It shall be fitted in the drain
sump.
ix) Stainless steel (SS 316L) sampling points of inlet and outlet water.
xii) Transparent windows at the resin separation and also at resin top level.
xiii) An initial charge of resin of good quality and reputed make for cation and anion
resins. The anion resins shall be also effectively remove silica.
iv) Subsequent top up of resins to all resin beds, if required, before the hand over of
the plant shall be made up by the Tenderer.
ii) The strength of acid regenerant at the cation bed inlet shall be within 5% W/W.
iii) Alkali regeneration system consisting of solution tanks, ejectors, etc. shall be so
designed such that during regeneration, anion resin bed in anion exchanger is
regenerated at about 5% (W/W) strength of alkali.
Regeneration system should be so designed that at a time either cation, anion or mixed
bed unit of a particular stream is regenerated. Provision for simultaneous regeneration of
cation and anion bed units to be kept to minimise the outage due to regeneration of ion-
exchange vessels.
Total capacity of Bulk Acid Storage Tanks shall be to meet one month’s requirement of
the DM Plant rounded to road tanker capacity. The Tenderer along with the tender shall
submit calculations for acid consumption. The total capacity of acid measuring tanks for
cation and mixed bed exchangers shall be for acid required for double regeneration. Acid
Measuring tank of adequate capacity shall also be provided for neutralisation pit.
Bulk acid storage tanks and Acid measuring tanks shall be constructed of FRP. The
tanks shall be provided with all accessories such as level indicator, level switch, vent with
breather, fume absorber, drain connections, etc.
i) Dosing system shall be ejector type. Pressurised water for the jet ejector for
cation exchanger shall be taken from degassed water pump discharge header.
ii) Pressurised water for jet ejector for mixed bed shall be taken from DM Water
regeneration pumps header
iii) Suitable sampling connections, flow indicators and density indicators shall be
provided to determine the flow rate and strength of the acid injected into the
exchanger.
iv) The dilution ratio of the ejector shall be properly selected such that the bed can
be effectively regenerated employing water at the available pressure. The
ejectors and nozzles shall be suitably designed for acid service and the high
velocity of liquid.
v) Acid dosing for neutralisation pit shall be through gravity from acid measuring
tank.
These units shall be designed for regeneration with sodium hydroxide and shall
consist of the following equipment.
Total capacity of Bulk Alkali Storage Tanks shall be to meet one month’s requirement of
the DM Plant rounded to road tanker capacity. The Tenderer along with the tender shall
submit calculations for alkali consumption. The total capacity of alkali measuring tanks for
anion & Mixed bed exchangers shall be for alkali required for double regeneration. Alkali
Measuring tank of adequate capacity shall also be provided for neutralisation pit.
Bulk alkali storage tanks and Alkali measuring tanks shall be constructed of FRP. The
tanks shall be provided with all accessories such as level indicator, level switch, vent with
breather, CO2 absorber, drain connections, etc.
i) Dosing system shall be ejector type. Pressurised water for the jet ejectors for
anion exchanger and mixed bed shall be taken from DM Water regeneration
pumps header.
ii) Suitable sampling connections, flow indicators and density indicators shall be
provided to determine the flow rate and strength of the alkali injected into the
exchanger.
iii) The dilution ratio of the ejector shall be properly selected such that the bed can
be effectively regenerated employing water at the available pressure. The
ejectors and nozzles shall be suitably designed for acid service and the high
velocity of liquid.
iv) Alkali dosing for neutralisation pit shall be through gravity from alkali measuring
tank.
I. Backwash
The mixed bed resins shall be backwashed to segregate anion and cation resins.
Acid regeneration of cation resins in the mixed bed shall comprise of acid
measuring tanks and ejector with all accessories.
Provision shall be made in the design to prevent diffusion of acid to the anion bed
during acid regeneration by maintaining suitable downflow of water in the anion
resin bed.
Alkali regeneration of anion resins in the mixed bed shall comprise of alkali
measuring tanks and ejector with all accessories.
Provisions shall also be made to prevent diffusion of alkali to the cation bed during
alkali regeneration by maintaining suitable up-flow of water.
After regeneration and rinsing of the resins in the mixed bed the two resin beds
shall be mixed by blowing compressed air through the resin bed.
Two Nos. DM Water storage tanks each of 12 hrs holding capacity shall be provided.
These shall be vertical, cylindrical, shell type atmospheric tanks with flat bottom. MSRL
lining of 4.5 mm thickness shall be provided. Externally these shall be painted with 2
coats of epoxy primer and 3 coats of final paint. These tanks shall be complete with one
no. 600 mm dia manholes, overflow, air vent, drain, sample connections, CO2 absorber,
staircase, platform, handrails etc.
8.06 BLOWERS
Each blower shall be supplied with electrical motor starter, Vee belt drive, protection
screen etc. The capacity of the air blowers shall be suitably selected so as to meet the
air demand of the various vessels, degassers and neutralisation pit. Blowers shall be of
oil free twin lobe/ centrifugal type and its material of construction shall be CI. All the
blower motors shall have a minimum of 15% margin over the rated bhp.
8.07 PUMPS
These pumps shall be split case single end suction horizontal centrifugal type directly
coupled to the electric motor through a flexible coupling and mounted on a common
foundation and shall be complete with all accessories.
All dosing pumps shall be controlled volume metering gear pumps. Pumps, which are
handling corrosive water, shall be suitably lined.
Sampling rack shall be provided in the laboratory room adjacent to MCC room to facilitate
centralised collection of samples. Small diameter stainless steel pipelines shall be
provided to convey water upto the sampling rack.
The common neutralisation pit shall be of RCC construction lined with acid/ alkali proof
lining suitable for holding regeneration effluents generated from two streams of DM Water
Plant with 25% margin. This shall have two compartments. A minimum free board of 500
mm shall be provided. Baffles, isolation gates, and hand railing shall be provided. Wire
mesh shall be provided along with hand railing to prevent small polyethylene bags, etc.
from falling into the pit due to wind.2 Nos.(1 W +1 R) effluent transfer pumps shall be
provided. These pumps shall be of C.I with rubber lining. Neutralisation shall be
automatic. Drainage pumps of neutralisation-pit shall be self priming.
8.11 PIPING
One complete set of inter connecting piping shall be supplied. This shall cover all
interconnections between equipment and pumps and general utility pipe work for services
e.g. compressed air, water for regeneration system, drinking water, toilet facilities, panic
showers etc.
The design pressure and material specification shall be as per requirement and approval
of Purchaser/ Consultant. The tenderer may, however, quote for alternative material
against individual services assigning proper reasons that the alternative material is better
suited for the particular service.
The non-rubber lined pipelines shall have butt welded joints with flange for equipment
connections, valves fittings etc. All rubber lined pipes shall be provided for with minimum
3.0 mm thick hard rubber lining. All joints shall be flanged with lining brought over the
flanged faces. Bolts and nuts shall be of stainless steel for rubber lined pipes. For
pipelines having long straight runs, flanges shall be provided at regular intervals and also
at bends to facilitate easy dismantling. Sectionalisation shall also be provided.
Piping for acid, alkali, corrosive water shall be MSRL Proper pipe fittings of readymade
type such as bends, reducers, tee, etc. shall be used appropriately.
8.12 VALVES
The description below is for the general guidance for selection of valves; exact type of
valve and MOC shall be subject to approval by Purchaser/ Consultant for case to case
basis.
Gate valves shall be of rising spindle type. For non-rubber lined valves, the valves for
shut off shall be gate type made of cast iron / gun metal / CS and shall be of flanged ends
for size above 40mm. Non return valves shall be of swing check type/ dual plate zip
check type/ lift check type suitable for installation in both horizontal and vertical lines.
For rubber lined lines, the valves for shut off shall be diaphragm type suitably lined with
rubber or teflon. Valves shall have indicators for `ON' and `OFF' position.
Motor operated valve shall be complete with electric motor, starter, necessary gear drive,
position limit switches, torque switches and all accessories as required. The valves shall
also have handwheel for manual operation.
All valves shall be arranged in the front of the vessel and at a height suitable for easy
manual operation. In case the height of any hand wheel/lever of a valve is more than
1200 mm above the floor, pedestal for operation shall be provided. However, the
Tenderer shall provide the hand wheels within 1200 mm to avoid pedestals.
Tenderer shall indicate the type of valves considered for various services.
Valves shall be designed, manufactured, tested and marked as per relevant Indian
Standards/ reputed International Standards and design codes.
Valves shall be of pressure rating to suit the system requirements at the points of
installation.
Each valve shall be supplied with a hand wheel/lever/wrench for operation. For motor
actuated valves, provision shall be made for manual operation in the event of power
failure.
All the valves provided with hand wheel/lever shall be clearly marked with “OPEN” and
“CLOSED” positions and an arrow to indicate the direction of opening/closing.
Gate, butterfly and non-return valves shall be provided with bypass arrangement as per
applicable standards. Bypass arrangement may be integral with the valve or connected
between pipes.
Unless otherwise specified, the dimensions and drilling of end flanges of flanged valves
shall conform to ANSI B16.1, Class 125 cast iron flanges. Flanges shall be at right angles
to the axis of the bore and concentric with the bore.
Valves shall be suitable for frequent operation as well as for operation after periods of
prolonged idleness in either open or closed positions.
Bodies of valves shall be double-flanged ends and shall be fitted with seat rings securely
fixed in machined recesses.
Stem shall be of stainless steel and forged or machined from forged/rolled bar. No
casting is permitted.
The valve shall be fitted with double faced cast iron wedge made in one piece and having
two machined facing rings securely fixed into machined recesses in the wedge.
The wedge-to-stem connection shall be designed in a way that their connection shall be
stronger than the weakest stem section in order to avoid detachment of the wedge from
the stem while operating the valve.
The guides and lugs shall be provided to guide the wedge through its full travel. The
guides and lugs shall be lined with brass or bronze and the liners shall be secured by
countersunk screws or rivets of non-ferrous metals.
All valves shall be designed for minimum torque requirement. The diameter of the hand
wheel shall not exceed 750 mm but shall be sufficient to enable operation of the valve
under the maximum operating head by a single person with an effort on the rim of the
hand wheel not exceeding 135 Newton-m.
Hand wheels shall be fixed to stem by a washer and a nut screwed on to the stem. The
collar on the stem shall be integral with the stem by forging and shall not be welded on to
it. Hand wheels shall be arranged to turn in a clockwise direction to close the valve.
Generally the valves are to be operated with hand wheel. Gear operation shall be
provided for gate valves of nominal size DN 125 and above unless otherwise specified.
Gear arrangement shall be totally enclosed bevel gear having grease case with grease
nipples/plugs and position indicator for open/ closed position. Gear operators shall be
designed to operate effectively with the pressure across the closed valve equal to the
cold non-shock pressure rating.
Butterfly valves to be installed on delivery lines of pumps and on headers shall be tight
shut-off valves and regulating valves respectively as per BS EN 593: 1998.
Butterfly valves shall be of double-flanged short body type with combination of manual
and electrical actuator operation unless otherwise specified. Lug type butterfly valves
may also be supplied after due approval by Purchaser / Consultant.
Valve body with integral seat, disc and hand wheel shall be of cast iron construction to
FG 260 grade of IS 210: 1993. The disc shall be designed to withstand full differential
pressures across the closed valve disc without exceeding a working stress equivalent to
one fifth of the tensile strength of the material used.
The shaft shall be of stainless steel to AISI 410 and shall consist of a one-piece unit
extending completely through the valve disc.
Valve seats shall be designed to provide tight shut-off in both directions. Valve seats shall
be of nitrile rubber.
Valves shall be fitted with sleeve type bearings contained in the hubs of the valve body.
Valves shall be equipped with thrust bearings which shall hold the valve disc securely in
the centre of the valve seat. Sleeve and other bearings fitted into the valve body shall be
of self-lubricated materials that do not have a harmful effect on water or rubber.
The body end ports shall be circular. The area of the flow way between the body end
ports shall not be less than the area of a circle of which the diameter is the nominal bore
size of the valve.
The disk shall be either integral with or separate from the hinge and shall have a flat
seating face. Where the disk is separate from the hinge, means shall be provided to
prevent the disk, hinge pin and retainers becoming detached in service.
Any parts of the valve which can become detached in service, such as hinge pin and
disk, hinge pin plugs, hinge pin stuffing boxes and two-piece disks, shall be locked. Hinge
pin design shall ensure accurate alignment of the disk and the valve seat.
All non-return valves shall be designed for anti-slam/ dash pot design to reduce surge
pressure.
Globe valves shall conform to IS: 778, Class I or higher as per System requirement.
Needle valves shall be of 800 class minimum. Body, seat, spindle, Nut and hand wheel
shall be SS-316.
Ball valves shall be of lever operated type and of 800 class. Body shall be SA 3S1 Gr
CF8M. Ball, stem, gland and lever shall be AISI 316. Seat and seal shall be of RTFE.
Valves shall conform to BS 5156.
Diaphragm valves shall be of (weir type) class 150. Body and bonnet shall be of CI (IS
210 FG 260). Stem shall be of SS-410. Stem bush shall be S.G. Iron. Diaphragm valves
shall conform to BS: 5156
Electric actuators of valves shall be complete with electric motor, necessary gear drive,
torque limit switches, position limit switches and terminal board.
Micro-switch shall be provided on the valves for disconnecting power supply which will
operate when the valve is operated manually.
All motor operated valves shall have de-clutchable manual override along with the
position indicators. The motorised valve shall be designed in such a way that it is
possible to remove the actuator from the valve without requiring shutdown.
All limit switches shall be dust and water proof. All motors shall be suitable for DOL
starting.
Motors shall be capable to start and run-up with the driven mechanism/equipment
connected at a minimum of 85% of the rated voltage at the terminals.
All motors shall be capable of operating satisfactorily at full load for 5 minutes without
injurious heating with 75% of the rated voltage at its terminals.
Starting torque shall be less than 160% of the rated torque. Starting current shall be less
than or equal to six times the rated current.
Four-pole motors shall be used for all general applications unless specific drive
requirement calls for.
Sluice gates are used as a means of flow isolation in channels and on ends of pipes
entering wet walls. Sluice gates are used against a wall between two basins or between
a pipe and an open channel.
Sluice gates have been usually located when the influent channel enters the wet well and
can be operated to isolate the section of the wet wall for subsequent dewatering and
maintenance/repairs.
The design and constructional features of the sluice gates shall generally conform to the
provisions as given hereunder. However, the material of construction shall be as
specified subsequently in this document under Material of Construction.
The gate frame shall be a one piece casting having dimensions for the respective sizes of
gate as stated in appropriate length, cast integral at the back for ease of support in the
waterway and to provide an effective seal.
A cast iron side guide strip having a machined taper face on the underside shall be fixed
to the frame on each side by mild steel studs and extending over the height of the
waterway to provide effective guide throughout the travel of the door.
A stopper shall be cast integral immediately below the waterway and central with it to limit
the travel of the door and to avoid the chances of overstraining of wedge brackets. The
stoppers shall be provided in such a manner that they do not foul with the seat facings on
the door.
The gate door shall be one piece casting having integrally cast horizontal and vertical
reinforcement ribs for rigidity and strength and two integrally cast lugs drilled to take a
M.S. bearing pin for connecting the lifting rod with the door. On each side there shall be
tapered snugs or gunmetal or bronze tape strips not less than three, machined to match
similar taper faced side guide strips on the frame. A stopper to match that on the frame
shall be cast integrally at the bottom.
Cast iron faces of gate frame and door on which seat facings are to be fitted shall be
properly machined. Facings shall conform to the dimensions given in applicable
standard. Facings shall be so secured by brass rivet pins in the machined grooves of the
frame and the door and machined and hand finished, that with the door fully shut, a
satisfactory water tight seal is formed on the waterway. The contact between the facings
shall be sufficiently close at every point in the perimeter so as to produce a uniform
bearing all around. The attachment of the facings to the frame and the door shall be so
carried out that when finished they shall remain in place free from distortion or loosening
during effective life of the sluice.
Guides shall be adequately secured to the main frame by stud bolts and provision shall
be made for appropriate longitudinal movement to adjust degree of wedging consistent
with sealing properly. There shall be little lateral movement and tongues, keys, shoulders
or lugs may be provided for the purpose.
The locations of anchor bolts for the gate frames shall be as per the applicable standard.
The diameter of anchor bolts shall not be less than 15 mm. The diameter of anchor bolts
for larger gates shall be 20 mm minimum.
The lifting mechanism shall consist of a pillar mounted manually operated geared or un-
geared head-stock. The pillar shall be provided with a suitable opening with detachable
cover to facilitate easy cleaning and greasing of spindle threads.
The height of headstock shall be sufficient to enable an individual to operate the gate
comfortably without bending from the waist. For smaller gates, the height of hand wheel
from the base of headstock shall not be less than 600 mm. For larger size gates, the
height of hand wheel from the base of headstock shall not be less than 750 mm.
The diameter of hand wheel shall not exceed 750 mm but shall be sufficient to enable
operation of gate under the maximum operating head by a single person with an effort on
the rim of hand wheel, not exceeding 136 Newton-m while crack opening the gate and
not exceeding 68 Newton-m during normal opening after the gate is crack opened. The
face of the hand wheel shall be clearly marked with the words "OPEN” and "CLOSE" with
an arrow to indicate the direction of opening.
The headstock shall be provided with a suitable locking arrangement and gate position
indicator.
The lifting rod shall be provided with square threading, length of threaded portion being
approximately 250 mm more than the height of gate opening.
The lifting rod shall also be provided with a safety stop nut at the top to prevent the
chances of over closing of gate.
The lifting rod shall be provided with sufficient number of rod guide brackets to limit the
unsupported length of rod.
All the nut bolts on the gate assembly and rod guide brackets likely to get submerged in
water shall be galvanised.
There shall be a provision on the gate for preventing free movement of shutter in the
frame during transit, storing and handling. This provision shall be painted with red paint
so that it can be easily noticed and removed immediately after erecting the gate
assembly before an attempt is made to open the gate.
Plate flanges having raised face shall be provided for all the valves and they shall be of
mild steel and conform to the relevant table of IS: 6392.
Black bolts and nuts confirming to IS:1363 shall be provided for the companion flanges.
Rubber gaskets conforming to IS:638 shall be provided for the companion flanges.
Sl.
Description Parameters Values
No.
DM WATER PLANT
1. After activated carbon filter Turbidity <2 ppm
8.14.01 Pipes
Design
Temperatu
Services Pressure, Piping Specification
re
kg/cm2
Filtered water Ambient 7 IS: 1239-Part I 1990. (R.A.1995)
HEAVY GRADE / IS:3589-2001
Cationic water -do- 7 -do- with rubber lining
Degassed water -do- 7 -do-
Cationic water -do- 7 -do-
Degassed water -do- 7 -do-
Anionic water -do- 7 -do-
Dil HCL -do- 7 -do-
Dil NaOH -do- 7 -do-
DM water -do- 7 Stainless steel after DM water
transfer pump discharge
8.14.02 Valves
Working
Tempera
Service pressure Type Material Remarks
ture
kg/cm2
Filtered water Ambient 7 Globe/ CI or gun IS:14846-
Gate metal 2000/IS:778-
1984 (R.A. 1995)
Working
Tempera
Service pressure Type Material Remarks
ture
kg/cm2
check 1984(R.A.1995)
Acid water -do- 7 Diaphrag CI Ebonite
m lined
Dil HCl -do- 7 -do- -do-
Dil NaOH -do- 7 -do- -do-
DM water -do- 7 Globe SS316 DM water pump
outlet
Sampling -do- 7 SS316
valves
Cationic water -do- 5 Diaphrag CI Ebonite
m lined
Degassed -do- 5 -do- -do-
water
Note: Valves in front of vessels/ filters shall be pneumatically operated diaphragm valve.
Approval category
Information category
The quantity of drawings and documents listed above to be submitted to client/ consultant
alongwith the offer and after placement of order shall be as per the general conditions of
contract ( GCC ) of the tender and as per finalisation before placement of order.
For each of the items being manufactured, following test certificates and
documents, as applicable for each of the equipment, in requisite copies including original
shall be submitted to Purchaser/Consultant. All test certificates must be endorsed by the
Manufacturer and Contractor with linkage to project, purchase order and acceptance
criteria.
i) Raw materials identification & physical and chemical test certificates for all
materials used in manufacture of the equipment (except IS 2062-1992 Gr.A
& IS 210-1993,FG-150).
iii) Details of stage wise inspection & rectification records for fabricated items,
castings, forgings and machined articles.
xiv) Diagnostic features of NC/CNC system and test certificates for electrical
items.
xvi) Certificates from competent authority for the items coming under statutory
regulations.
8.16 PENALTIES
The tenderer shall meet the quality of water at various stages as given in Table below
The values given in Table having variation of +2% is acceptable with penalty. The penalty
shall be 1.5% of the total value.
The values having variation of +3% is acceptable with penalty of 3% of the total value
and the values having variation of above +4% is not acceptable.
In general the spares shall include the following as applicable depending upon the
equipment offered by the Contractor. The spares are intended to cover all
wearable/damageable delicate items of the plant.
Further, the following list of spares shall hold good for all the pumphouses, DM
Plant, Soft Water Plant, Water Treatment Plant including Raw Water & Drinking
Water plant, Fire-water pumphouse, Make-up water pumphouse, pumphouse for
ETPs of GCPs of BF & BOF etc. as applicable.
Following spares for each type of pump shall be provided for each pumphouse/
installation:
01 Pumps:
I. Drainage Pumps :
i. Impeller : 02 sets
ii. Shaft complete with all mountings : 02 sets
viz.- intermediate coupling etc.
iii. Bearings (guide & thrust) : 02 sets
iv. Guide bearing housing of : 01 set each
rubber bearings
v. Heat exchanger tubes for thrust : 02 sets
bearing cooling
vi. Motor fan : 01 no
vii. Motor end cover : 1 set
viii. Motor coupling : 01set
03 For one complete set of blowers of various sizes used in the DM plant.
The tools and tackles indicated below shall be supplied for each of the
pumphouses, DM Plant, Soft Water Plant, Water Treatment Plant including Raw
Water & Drinking Water plant, Fire-water pumphouse, Make-up water pumphouse,
pumphouse for ETPs of GCPs of BF & BOF etc.
Sl Description Nos
No.
1. Pipe wrench suitable for pipe 1 no.
size upto 50 NB
2. Slide wrenches, size 8", 12" & 1 no. each
14"
3. Double ended spanner set M-6 1 set
to M-36 size
4. Ring spanner set M-6 to M-36 1 set
size
5. Ratchet & sockets set for 1 set
hexagonal
head screws and bolts size M-6
to M-36
6. Allen key sets size M-6 to M-24 1 set
7. Flaring tools with dice
8. Grease gun 1 no
9. Oil gun 2 nos
10. Screw driver (3 sizes) 2 nos. in each size
11. Sprit level 1 no
12. Feeler gauge 2 sets
13. Screw pitch gauge 1 set
14. 12" flat file 2 nos.
15. 12" square file 2 nos.
16. 12" round file 2 nos.
17. Inside and outside calipers (3 1 no in each sizes
sizes)
18. 12" hand hacksaw 1 no.
19. Hacksaw blade for above 3 dozen
20. Rubber lining patch work kit 2 nos.
21. Cutting pliers 1 no.
22. Nose pliers 2 nos.
23. Spark tester for checking rubber 1 no *
lining
24. Soldering lead with flex 1 kg
25. Steel scale (500mm & 1000mm 2 nos. in each size
long)
26. Hand lamps 2 nos.
27. Taps M-6 to M-32 sizes 1 sets
28. Dies M-6 to M-36 sizes 1 sets
29. Pliers 2 nos.
30. Adjustable wrench 2" to 8" pump 1 no
impeller
31. Tool box for above tools 2 nos
32. Dial gauge with clamps for 2 sets
alignment
Sl Description Nos
No.
33. Micrometer 1 no **
34. Bearing pullers (3 jaw & 2 jaw) 2 each
35. Circlip pliers (internal & external) 1 each
36. Vernier calipers 1 no.
9.01 Fire water pumphouses shall be provided with required nos. of electric motor driven
pumpsets, diesel engine driven pumpsets and jockey to cater to the needs of the water
based fire-fighting system an independent fire fighting network with all associated
electric, instrumentation piping handling and hoisting facilities etc. shall be provided. in
line with the NFPA – 20, FM, UL, TAC requirement 2003. Also a wet riser ring main shall
be provided which will cover the complete plant complex.
9.02 The fire fighting pumps and accessories will be housed in a separate fire fighting pump
house.
9.03 Internal hydrant shall be located at 30m interval and external hydrant shall be located at
45m interval
9.04 Internal hydrant shall be provided on all the floors of the buildings, Junctions houses,
office building, conveyor galleries, other process building etc.
9.06 Filling connection to fire water reservoir shall be provided from the proposed make-up
water line for the plant complex.
9.07 The detail specification of Fire water pump, diesel engine and hydrants are specified
below :-
i) The centrifugal pumps shall be suitable for discharging not less than 150% of the
rated capacity at a head of not less than 65 % of the rated head. The Shut off
head shall not exceed 120% of the rated head.
iii) Horizontal centrifugal fire water pump (electric driven) shall be connected to
alternate power supply.
iv) All the pumps shall be in positive suction.
The hose cabinet shall be fabricated out of fiber reinforced plastic (thickness 2.5 mm) of
size 750 mm x 600 mm x 250 mm. The top shall have pressed edge slightly projecting
outside to prevent water (while cleaning etc.) from entering the cabinet. The cabinet shall
be fitted with glass fronted door. The door shall be provided with a knob and a lock with
duplicated key on the body of the door with a glass cover. The glass of the key box shall
be easily replicable. Suitable hooks, etc, shall be provided in the cabinet to hold the hose
reels etc. mentioned above. Suitable wall mounting bracket shall be provided with the
cabinet. The Tenderer shall provide a fully dimensioned general arrangement drawing
indicating materials of construction, relevant specifications, etc.
Each hydrant shall be provided with 15m long delivery hose (Type B IS636) with SS
coupling and accessories.
Sl.
IS no. Description Quantity
No.
A. INTERNAL HYDRANT
Sl.
IS no. Description Quantity
No.
b) IS:903 (1984 One branch pipe ( Stainless Steel ) -do--
R.A.1990)
c) -do- One 25mm nozzle ( Stainless Steel ) -do-
d) -do- One nozzle spanner ( Stainless Steel ) -do-
B. YARD HYDRANT
The details and specification of pumps, valves, pipes, fitting, pipe supports and
associated civil, structural, electrical, instrumentation, material handling, air-conditioning
& ventilation etc. as specified above and as mentioned in other clauses of this
specification are applicable for this system also.
Flow control /isolating valves, drain valves, air release valves and Compensators,
wherever necessary, shall be provided for the complete in-shop pipe network.
All valves shall be suitable for service conditions i.e. quality of fluid, flow temperature and
pressure under which they are required to operate.
Valves shall be provided on pipe network for isolation of pipe section and equipment,
control of pressure and flow, venting, draining etc. They shall be suitable located
considering ease of operation and maintenance.
All valves shall be provided with hand wheel and position indictor. The face of each hand
wheel shall be clearly marked with words “Open” and “Shut” with arrows adjacent to
indicate the direction of rotation.
Valves shall be provided with suitable extension spindle and head stock assembly
wherever required. In case gears or bevel system are used , these shall be of cast steel
or suitable grade cast iron with machine cut teeth.
Non-return valves shall be Dual Plate zip check type and shall have a permanent “Arrow”
inscription on its body to indicate direction of flow.
Larger size valves shall be provided with by pass and drain arrangement.
Float operated valve shall be preferably be right angled pattern complete with ball float,
level and other accessories.
Butterfly valves shall be of quotable flanged, tight shut of design with angular travel of 90
deg. from open to shut off position.
a) Pneumatic Actuators shall be of double acting type for on/off operation and shall be
directly mounted on the valve. Single acting type shall be considered for fail/safe
operation
• SS tubing of 3.00 m length along with isolation valve and suitable end connections
for connecting it to ½” MS pipe by welding complete with required pneumatic tube
fittings for connection to dump valve and ½” MS Pipe.
• Open and close position, proximity switch, 2-wire, universal type (AC/DC),PLF, IFM
make, wired up-to a junction box.
• Actuator shall be capable of operating the valve when the air pressure is 6 Kg/cm2
and shall be able to operate the valve even when the air pressure drops to 4.5
Kg/cm2.
• Each actuator shall be supplied complete with two or one way solenoid valves of ¼”
pipe size. Material of construction for body shall be Brass.
• Solenoids for all solenoid operated valves shall be suitable for 20 to 240V AC/DC
power (Universal type).
• For termination of cable to the solenoid, proximity switches junction box shall be
provided by supplier. Terminals shall be suitable for terminating 2.5 sq. mm copper
conductors. 20% spare terminals shall be provided in the junction box.
• Apart from other tests, performance test for pneumatically operated valves with
respective actuators mounted in position to show valves opening and closing and
observation of leakage shall be conducted.
Air release valves shall be cast iron, single large orifice type, with flanged ends. Air
release valve shall conform to IS: 14845-2000.
1 MAKE ROTORK/AUMA/LIMITORQUE
2 OUTPUTMOTION ROTARY
3 OPERATION TIME 90 SEC (MAX)
4 SERVICE INLET PR.-8.5 Kg/cm2 (MAX)/ as per System
CONDITION requirement
TEMP.-50 deg.C max.
FLUID – WATER
5 ACTUATOR SHALL BE SUPPLIED COMPLETE WITH THE FOLLOWING
A HANDWHEEL FOR MANUAL OPERATION
B POSITION INDICATOR
C OPEN/CLOSE LIMIT SWITCHES
D TORQUE LIMIT SWITCHES
E EACH LIMIT SWITCH SHALL HAVE 2 NO / 2 NC CONTACT SWITCH FOR
10 AMP. AT 240 V
F MOTOR TERMINALS AND LIMIT SWITCH CONTACTS SHALL BE WIRED
UPTO A TERMINAL BOX TO BE MOUNTED ON THE VALVE ACTUATOR
J) MOTOR SPECIFICATIONS
A) Mechanism
The online strainer shall be of cylindrical body with wedge wire slot tube element housed
in it. For automatic strainer, area will be in the ratio of 1:3 where-as for strainer it will be
1:8. The strainer should start the self cleaning process when the pressure differential
across the screen reaches a preset value or predetermined lapse of time. Cleaning of the
strainer elements is to be carried out by the suction scanner with its spiral rotational
movement.
The strainer control shall be carried out by PLC and MCC system. However, Tenderer
shall furnish functional description / Control write-up, PLC Input/Output list to the
Purchaser / Consultant.
Flush drain valve and vent shall be provided for each unit of the main strainer. The
design of the strainer shall be suitable for easy maintenance and replacement of the
parts and inspection.
Each strainer shall be provided with basket opening area (eight times of pipe cross
section area or bigger) to ensure high flow volumes at low pressure and a long service
life.
Provision shall be made for collection of drainage water from the strainers and shall be
suitably connected to the plant area drainage system.
Along with the offer the Tenderer shall furnish details of the basket strainer such as
make, general arrangement and cross sectional drawings, operating parameters,
materials of construction of various components supported by manufacturer's literature
and catalogues.
Valves to be supplied as part of the strainers shall conform to the following standards.
Pressure rating of all valves shall be 16kg/cm2.
All motors shall be suitable for 415V, 3-Phase power supply. Actuators shall be provided
with travel Limit switches and Torque switches. These switches shall have IP-55 degree
of protection. It shall have 2 NO + 2 NC contacts rated for 10 amps AC
a) Electrically operated built-in change over valves shall be complete with electric
motors, necessary gear drive, position limit switches, torque switches and terminal
box.
b) Motor shall be squirrel cage induction motor with DOL starter at 415+/- 10% 50Hz
+/- 5% having the following:-
c) Arrangement shall be provided on the valve for disconnecting power supply, which
shall operate when valve is opened manually.
d) All end position limit switches and torque switches for open & close position shall
be dust and water proof.
e) All the limit switch contacts shall be wired in a terminal box (part of actuator)
suitable for termination of 14X1.5 mm2 control cable.
Duplex / simplex basket strainers shall be installed on water pipelines to arrest suspended
particles of 1000 microns or bigger size in supply water. In general for the secondary open
circuits 100% filtration through simplex strainers will be provided. Two nos simplex strainers
shall be provided on each line/header complete with isolating valves so that in case of
maintenance/cleaning of one strainer the total flow is through the another healthy strainer.
The simplex strainer shall be of backwash design without the need to take out the strainer
element for backwashing, backwashing shall be achieved through backwash valves’
operation.
For TBS, TGS side-stream filtration of 20% of total flow shall be provided using simplex
strainers.
- Strainers/Duplex arrangement with built-in valves shall be such that one element
will always remain in operation ensuring continuous uninterrupted supply of filtered
water from each strainer. It should not be possible to isolate both the strainers
simultaneously due to even inadvertent rotation of hand wheels for movement of
valve disc during changeover from one basket to another. The changeover valves
shall have manual drive.
- Pressure equalizing connections for both the chambers shall be provided for
smooth changeover.
- Two nos. dial type pressure gauges of size 150 mm dia shall be provided suitably
mounted at the inlet and outlet mains of each strainer.
- Differential pressure switch with alarm contacts shall be provided for each unit of
the main strainer across inlet and outlet for operation at a differential pressure
adjustable within 0-1 kg/cm2 .
- Flush drain valve and vent shall be provided for each unit of the main strainer. The
design of the strainer shall be suitable for easy maintenance and replacement of
the parts and inspection.
- Each strainer shall be provided with basket opening area (eight times of pipe cross
section area or bigger) to ensure high flow volumes at low pressure and a long
service life.
- Provision shall be made for collection of drainage water from the strainers.
Testing and inspection of equipment and materials shall be carried out at the works of the
Contractor or his sub-Contractor during manufacturing and on final product to ensure
conformity of the same with acceptable criteria of Technical Specifications, approved
drawings, authenticated manufacturing drawings and reference Indian/International
standards.
• Material test.
• Dimensional checking.
• Performance test.
11.05 PENALITIES
The pressure drop across the strainer under semi-clogged condition shall not exceed 5
mWC.
The size of suspended solids in outlet shall not exceed 200 microns for on line automatic
backwash strainer and 500/1000 micron for Duplex/ Y strainer.
In the event of a shortfall in the guaranteed performance figures the Purchaser shall have
the right either:
to reject the plant as a whole and in such event the Contractor shall have to pay back the
whole sum paid to him on this account.
Supply of drawings, design calculations and data as detailed below for approval and further
detailed engineering within 4 weeks of placement of order. All drawing shall be drawn in the
project drawing format enclosed herein .
- General arrangement and cross sectional drawing showing overall dimensions and
weight.
- Inspection and testing procedure including QAP and details of shop test for various
components, sub-assemblies.
- Dimension and weight of single largest piece & other information regarding
hoisting and handling required for maintenance.
d) For comments:
EQUIPMENT SPECIFICATION
1. Type of Hose : Single Stainless Steel wire braided corrugated flexible hose
assembly SS AISI 304, fitted with SS female swivel fittings at
both ends (Nut nipple) suitable for connecting pipes. As per
BS: 6501 Part-I with type B flexibility. Alternatively cam lock
connection can also be offered.
2. Size : By Bidder
8. End connection : Female swivel end on both sides (Nut nipple) suitable for
connecting pipes having flanges. Alternatively camlock
connection with quick coupler and adaptors suitable for
connecting to pipes/pipe fittings can also be offered. Final
selection be subject to Purchaser’s / consultant’s approval.
Material specification:
Rubber Expansion Joints shall be made of high grade abrasive resistant natural rubber
compound reinforced with adequate numbers of piles of heavy cotton duck, rayon cord,
impregnated within rubber compound and further reinforced with square metal ring
embedded in it. The outer exposed surface of rubber expansion joints shall be given a
coating of synthetic/neoprene rubber and further painted with chlorinated rubber based
0
paint. Rubber expansion joints will be suitable for design temperature of 50 C and for
handling clear water. Rubber expansion joints shall absorb vibration, shock and axial
compression of 10 mm, axial elongation of 10 mm and lateral movement of 10 mm.
Control unit:
One set of control unit (stretcher bolt assembly) consisting of 2/3 nos. limit rod (material
IS:3657 Gr. 6.6), Stretcher Bolt, Triangular Plate (material IS:226), Nuts (material IS:1363
Gr. 6.O) Steel Washer and Rubber Washer of durometer hardness of 100deg Centigrade
+/- 5 deg Centigrade.
The control unit shall be made suitable to make RE joint and no. of limit rod matched
against each.
4. Tie rod : 3 tie rods per Rubber Expansion Joint for upto
DN400, 4 tie rods for sizes DN450 and above
5. Material of construction
Body : Natural rubber compound
Cover : Neoprene rubber
Tie rod : Carbon steel
Sluice gates shall be supplied as per IS: 3042-1965. Gear box arrangement shall be of
open type for small size and closed type for sizes above 400mm size.
All assembly bolts/studs, nuts, anchor, bolts and washers are acceptable in stainless
steel construction to AISI: 304/ AISI: 410.
Item Nos. of all the gates shall be punched on the gate (at an easily identifiable place)
before dispatch.
i) Type of Mounting: Wall mounted type with head stock. Headstock shall have
geared handle for operation.
iii) Design code: Sluice gates shall be generally as per IS: 3042; 1965
(Reaffirmed 1998). Wedges shall be provided on the sides to
ensure maximum water tightness.
Sl Components Material
No.
The Raw Water Treatment Plant is to be provided to meet the make up water
requirements of various circulation systems.
Influent raw water for the proposed treatment plant will be made available partly from
STPs, Effluent treatment plants and from cooling pond.
It is proposed to install a water treatment plant comprising pre-treatment units for settling
and clarification and filtration for the influent raw water with a view to obtaining an
acceptable quality of make-up water & drinking water for the proposed expansion of the
Plant.
Raw water from the raw water reservoir shall be received in the stilling chambers, from
where it flows to flash mixers. After dosing of coagulants and flocculent in flash mixers,
the raw water flows to the cariflocculators. After clarification, overflow water shall flow to
the clarified water sump near the Make-up water pumphouse.
The underflow of the clarifiers and the waste wash water from the pressure filter shall be
collected in a sludge sump situated near the clariflocculator and shall be pumped to the
sludge pond. Suitable agitation shall be provided in the sludge sumps to avoid settling of
the sludge. Storage of chemicals and their dosing facilities shall be provided inside the
chemical house located besides the clariflocculator.
The tenderer shall provide slurry storage tanks & slurry transfer system alongwith piping.
The capacity of the slurry storage tank shall be adequate for storage of the waste wash
water generated from the back wash in conjunction with the underflow sludge discharged
from the clarifier during the said period. Two nos. of slurry storage tank for each
clariflocculator shall be provided of suitable capacity and 4 nos. (2W+ 2S) of slurry
transfer pumps will be installed for transporting the slurry to the proposed sludge pond.
Sludge recirculation System from underflow of clarifiers shall be provided by the tenderer.
The recirculation System shall be complete with necessary valves, fitting, etc. as required
alongwith sludge recirculation pumps (1W+2R), for each clarifier.
Clarified water from the clariflocculator flows to the clarified water sump. The clarified
water storage tank shall be provided with an adequate storage capacity. Clarified water
pumps, will feed the clarified water to a pressure filter (horizontal filtering mass type) with
sand/dual media for filtration of the clarified water. Filtered water will be received into the
make up water storage tank from where major part of the water will be pumped to the
make-up water network of the proposed Plant and another part will be used for back-
washing purpose of the pressure filter. The make-up water storage tank shall be provided
with an adequate storage capacity of make-up quality water.
Part of the filtered water will be chlorinated through a online chlorinator and pumped to
overhead tank from where it will be supplied through out the plant for drinking purposes.
The design of the treatment plant shall be based on the following considerations:
The maximum TSS after clariflocculator shall not exceed 30 ppm and maximum TSS in
the treated make-up water (after pressure filter) shall not exceed 10 ppm and the pH (at
200C) of treated make-up water shall be in the range of 7.5 to 8.2. With a view to
demonstrate the aforesaid guaranteed performance values, tenderer shall judiciously
carry out the process design calculations based on optimum chemical dosing rates for
each of the aforesaid conditions and include the most appropriate process scheme in his
offer.
15.05 DESIGN
The Contractor shall prepare the detailed working drawings for the complete treatment
plant
The Contractor shall design the complete system following good engineering practices
and standards. The detailed scope of design shall include:
The Make-up Water Treatment Plant shall be designed for an output capacity of design
requirement with a minimum guaranteed output capacity. The proposed treatment plant
shall consist of the following technological units/equipment/sub-systems :
Sl.
No. DESCRIPTION
001 Raw water inlet pipe line
002 Stilling Chamber
003 Flash Mixer
3
004 Clariflocculator Cap : 1700 m /hr (3W+1S)
005 Chemical storage cum preparation / Dosing area
006 Rapid sand gravity filter complete with piping and control valves,
water distributor, under drain collection system, air vents, drain cocks,
manholes, sampling points, instruments etc. with initial charge of
filtering mass.
007 Filter Air Blower
008 Slurry storage tank agitator mechanisms complete with shaft,
paddles, motor, gearbox, base plate, platforms, walkways, handrail
etc.
009 Slurry storage tank fittings viz vertical baffles and wear plates.
010 Sludge pumpsets (1W+1R) and pumping system
011 Raw water pumphouse
012 Raw water sump
013 Pumpsets
Raw water pumpsets (1W+2R)
Clarified water pumpsets (1W+2R)
Make-up water pumpsets (1W+2R)
Drinking water pumpsets ( 1W+2R )
014 Backwash overhead tank of 12m staging height / Alternatively
Backwash pumping system
015 Chlorine house and chlorination system
016 Alum solution preparation-cum-dosing tanks of MSRL construction
with SS-316 dissolving baskets.
Sl.
No. DESCRIPTION
017 Alum dosing pumps 0-200 lph, electromechanical type with SS-316
wetted parts
018 Lime preparation-cum-dosing tanks of MS construction with
dissolving baskets.
019 Lime dosing pumps, 0-200 lph, electro-mechanical type.
020 Polyelectrolyte solution preparation-cum-dosing tanks of MSRL
construction.
021 Polyelectrolyte dosing pumps 0-200 lph, electromechanical type with
SS-316 wetted parts.
022 Alum tank agitator with SS wetted parts complete with drive motor &
accessories
023 Lime tank agitators complete with drive motor & accessories.
024 Polyelectrolyte tank agitator with SS wetted parts complete with drive
motor & accessories.
025 Gate valves, non-return valves, plug valves and needle valves.
026 Clarified water, filtered/make up water, back wash water, waste wash
water piping
027 Chemical dosing piping (HDPE)
028 Underflow slurry piping (MS - heavy duty)
029 Instrumentation as per T.S.
030 Electrics as per T.S.
031 Structural work as per T.S.
2 Nos. Stilling chambers, (one for each clariflocculator) shall be designed to provide
adequate retention time for optimal functioning of the system.
1 no. Flash mixer (one for each clariflocculator) shall be designed to provide adequate
mixing time with the coagulant. Each of the flash mixer shall be capable of taking the
entire load in case one of the flash mixers is out of operation.
As such suitable piping arrangement on inlet side and outlet side of flash mixers is to be
provided along with necessary isolation valves. Pipes leading to clariflocculators,
structural ladders, platforms, hand-railings, etc. shall also be provided. Coagulant
preparation and dosing system shall also be provided. The outflow Pipes shall be
adequately supported.
One portable pH meter shall be provided to measure the pH of water before and after
flash mixer.
15.05.03 CLARIFLOCCULATOR
• The clariflocculator shall also contain overflow weir, peripheral launder for
collection of clarified water, sludge raking arms with MS scrappers and squeezes
attached to the bladder, sludge drainage pipeline with telescopic arrangement,
sludge chamber alongwith necessary instrumentation and protection system.
• Suitable measures for proper cleaning, flushing of the clariflocculator and its
various components shall be provided.
The Contractor shall design the chemical dosing/ storage system ensuring the
following:
• The chemical house shall be of two storied building having minimum two entries.
One entry shall be provided with a ramp for truck entry.
• The ground floor shall be used for storage of chemicals and the first floor shall
have chemical solution preparation tanks.
• Each of the solution tanks shall have a capacity to meet the requirement for a
minimum 8 hrs period considering a dosage of 50 ppm at 10 % concentration for
alum, 25 ppm at 10 % concentration for lime and 1 ppm at 0.5% concentration for
polyelectrolyte.
• One weighing machine shall be provided at the ground floor and weighed amount
of chemicals shall be transported to the first floor. A pallet box shall be provided
for lifting the chemicals. Six pairs of gloves for handling of chemicals along with
measuring jars, dissolving trays etc. shall be provided for safe and proper
handling and measurement of the chemicals.
• Metering pumps with SS internals shall be used for dosing the Alum, Lime and
Liquid Poly-electrolyte solutions to the flash mixer.
• Two pumps (one working + one standby) shall be provided each for dosing alum,
lime and poly-electrolyte (suitable for potable water usage with Purchaser’s /
Consultant’s approval).
• Each of the solution preparation tanks and solution handling tanks shall be
provided with agitators with electric drive. Material for agitator shaft and paddles
shall be stainless steel (AISI 304).
• The valves shall be of CIRL Diaphragm valves for alum & Poly-electrolyte and CI
Gate valves for lime.
• No effluents from the chemical house shall be discharged into the storm water
drainage system after neutralization. The contractor is to provide suitable
facilities to achieve zero discharge of effluents.
• Polyelectrolyte shall be of liquid form and shall be suitable for drinking water
application.
• Tenderer shall fill in the data sheet for chemical solution-cum-dosing tank and
metering pumps.
• Two sludge pumps shall be provided for the each clariflocculators. The capacity
and head of the pumps shall be decided based on the sludge characteristics. The
sludge pumps shall be of Ni hard impeller and casing, SS shaft, non clog,
centrifugal type.
• Sludge pumping system shall be so designed that the pump, pipe network and
valves shall be flushed with industrial water after completing the cycle of
pumping.
• The pumphouse shall be of civil construction having RCC columns and RCC
roof.
• The layout of the various equipment inside the pump house shall be designed by
the tenderer keeping in view the safety of the personnel and accessibility of
equipment.
• Necessary storm water drainage and faecal sewerage system, septic tanks and
soak pits etc. shall be provided for the pumphouse.
• Structural platforms with ladders shall be provided for the operation and
maintenance of the valves.
• The pipe network and valves within the pumphouse shall be adequately
supported so as to avoid undue stress on the pumps.
• Suitable toe drain, connected to garland drain, shall be provided in all the
pumphouses to drain out any spillage of water from the glands etc.
15.05.07 SUMPS
• The water sump shall be designed as per the Hydraulic Institute standards for
providing suction to the pumps. Effective volume of the raw water sump shall be
minimum10 minutes.
• The Raw water and static water sumps shall be of open type. The filtered water
and clarified water sumps shall be of covered type.
• The clarified water tank and makeup water tank shall have two compartments
each with provision to divert the entire flow to either of the compartments when
one of the compartments is under maintenance / repair. Both the compartments
shall have separate inlet pipe along with isolation valve (Sluice Valve), Overflow
and drain connections and shall be designed as per IS : 3370.
• Sump model test shall be carried out by the contractor through government
approved institutions.
• Three twin lobe type air blowers (Two working and one reserve) complete with
accessories and piping shall be provided by the tenderer for air scouring of the
filters. The air blowers shall be of oil free type.
• The air blowers shall be complete with drive motor, D.O.L starter, base plate,
coupling, coupling guard, bolts, nuts and gaskets, air filter, etc.
• The capacity and pressure of the air blower shall be decided to suit the
requirement of the filters. The drive motor shall be selected with at least 15 %
overload margin over the maximum shaft power requirement.
• The chlorine house shall consist of two rooms. One room shall be planned for
chlorine storage and the other room shall be planned for dosing chlorine gas into
the pipeline feeding filtered water to the overhead tank. The chlorine storage
room shall have sufficient space to store one month's requirement of chlorine.
The chlorine storage room shall also house the safety and supervisory
equipment.
• The storage and dosing rooms shall be provided with 2 doors and the doors shall
open outwards. The rooms shall be accessible to truck approach and shall be
provided with ramps.
• Normally natural ventilation and means for cross ventilation shall permit changes
of complete air in the rooms in about 10 to 15 minutes. Ventilators shall be
provided at the bottom, one opposite to the other. The rooms shall be vented to
upper atmosphere and shall be equipped with positive means of exhaust near
the floor level, capable of complete air change within 3 to 4 minutes at the time of
emergency. The ventilation system shall consist of a combination of fresh air inlet
system and exhaust fans. The air fans shall have dry panel filters for supplying
filtered air into the rooms. The supply air fan shall of tube axial type and the
exhaust fan shall be of propeller type.
• Chlorine dosing shall be done with a view to maintain 0.5 mg/lit of free residual
chlorine at the consumption points.
• The chlorine house and chlorine dosing system shall be designed as per IS -
10553 Parts I & II -1983 (RA 1990).
• The following safety and supervisory equipment shall be provided in the storage
room.
- 2 Nos. Gas masks.
- 1 No. Residual chlorine testing kit.
- First aid box and eye wash fountain.
001 2 Nos. agitator assemblies shall be provided for installation in the open topped slurry
storage tanks to ensure the following:
002 The slurry storage tanks will be of RCC construction will be constructed by the Tenderer
having required storage capacity. The tank will receive the underflow sludge discharged
from the clarifier on a continuous basis and shall also receive the waste wash water and
rinse water discharged from the Filter on a batch-basis during the back washing period.
003 The selection of the correct agitator mechanism shall be based on selection of the
appropriate propeller diameter and rotational speed to ensure that sufficient axial force is
developed to maintain the solids in suspension in the storage tank to suit the aforesaid
tank dimensions and the slurry characteristics.
004 The agitator shall be of axial flow, single MIL (minimum induced loss) propeller type
designed for the requisite duty conditions. The propeller shall be specifically designed to
minimise the induced losses that are generated by the vortex sheets created by the
pressure differentials in the liquid near the propeller trailing edges.
005 Each agitator assembly shall consist of a super structure which shall be mounted on the
open topped slurry storage tank and shall support the gear box, motor, V-belt drive, shaft,
propeller, etc. The super structure shall be fitted with necessary walkways and handrails
also.
a) Propeller: - Keeping in view the height: area ratio of the tank and the anticipated
percentage value of solids in the slurry, only one propeller will be used which shall be
located at the bottom of the shaft. The propeller blades shall be made from steel and
bolted to the flange(s) of the agitator shaft. The propeller assembly shall be balanced
within limits, which shall be dictated by the weight and the proposed operating speed.
Tenderer shall recommend whether the propeller blades are to be covered with any
abrasion resistant rubber.
b) Propeller shaft: - The propeller shaft shall be constructed from carbon steel and shall
be provided with flanges welded to it at the top, bottom and intermediate positions (as
required). The dimensions of the shaft shall be so selected that the running speed does
not exceed 50% of the critical speed.
c) Drive: - Gear reducer drive shall be provided to suit to the exact duty requirements for
the agitator. Medium sized propellers may be driven by gear boxes with vertical input
shaft and vertically mounted motors and larger units will be driven by gear boxes with
horizontal shaft and horizontally mounted motors. The gear box will be of multi stage,
helical gear variety and the complete gear and shaft assembly shall be housed in a high
grade cast iron housing. The gear box shall be driven by a standard 4 pole motor via
V-belts and pulleys fitted with tapered bush. The output shaft shall be fitted with a cast
steel half coupling to match the propeller shaft.
General
As part of the water treatment plant, a sludge dewatering plant shall be provided for
handling the underflow sludge from the clariflocculators.
The sludge dewatering plant shall be capable of producing filter cake of low moisture
consistently. Suitable mode of filter cake discharge shall be provided under the sludge
dewatering plant so that the filter cakes can be conveyed by trucks for final disposal.
The dewatering station shall be PLC controlled and operated from a control room located
in the chemical house.
Design Criteria
The sludge dewatering plant shall consist of either 2 nos of plate & frame type filter
presses complete with all ancillary equipment and interconnecting piping or Rotary
Vacuum Drum Filter/ Disc Filter with required accessories.
i Vacuum Receiver
ii Moisture Trap
iii Vacuum Pump
iv Filtrate Pump
vi Steel Seal Pot
vii Etc.
Plate & frame type filter presses type sludge dewatering system shall be suitably
designed so as to conform to the following requirements:
The Filter presses together shall be suitable for continuous dewatering of the entire
underflow sludge received from the two thickeners.
The filtrate from the dewatering station shall be led back to the thickeners.
Filter Press
The capacity shall be provided for general air exchange and for dissipation The filter
press shall conform to DIN # 7129 and shall be of horizontal / vertical configuration.
The filter press shall have high hydraulic capacity and shall be designed for dewatering
the slurry efficiently with proper handling and disposal facilities for dry cake and 100%
removal of filtrate, eliminating all blowback and residual lockup of filtrate.
The overall operating cycle time for each press shall be not less than1hour.
The filter fabric shall be capable of handling the desired slurry with appropriate weave,
breaking strength, air permeability and long durability. The filter cloth shall not warrant
any special cleaning. The filtering area shall be optimum.
The material of construction of the components of filter press shall be matching with the
duty conditions. The filter press shall be completely assembled on an integral structural
base.
Smooth sliding of plates over tie bar shall be ensure by suitable arrangement.
Cam arrangement shall be provided for enabling jerking action on the cake for dislodging
it to the conveyor / hopper installed below the press.
The resulting filter cake shall be consistently thick with low moisture content. Suitable
cam arrangement shall be provided for dislodging of cake to the hopper located below
the filter presses.
The filter press structure shall consist of feed head, moving plate, end plate and tie bars.
The structure shall be MS fabricated of structural steel. The moving plate shall be
mounted on the tie bars by means of rollers.
The filter press frame shall be strong enough to withstand forces of hydraulic cylinder
during the operation of press.
Suitable coupling shall be provided for minimizing misalignment between the movable
head and ram.
Tie bars shall be designed in such a way so that they remain straight and rigid. Tie bars
shall be keyed to the feed head and end plate.
The structure of the press shall be fabricated suitably for providing adequate distribution
of static loads.
Drip tray shall be made up of MS 2mm thickness with hard rubber lining. The proper
sealing between the joint of door shall be done to avoid spillage.
Filters tray shall be shall be constructed in MS with hard rubber lining of 3mm thickness.
Filter plates
Plate shall be rigid in construction for withstanding fluid pressure and hydraulic oil
pressure for tightening during operation of press.
Filters plate shall be of the center feed, four-cornered . Handles shall be provided on the
sides of the plates for getting suitable support from tie bars.
Plate material and filter material shall be selected by the tenderer considering the
pressure, temperature and analysis of the influent slurry.
Air manifold
A manifold shall be provided to allow air blowing through the press for removal of residual
moisture at the end of the filtration cycle. Individual control valves for each of the corner
discharge port shall be provided for the filterate collection header. A common discharge
header shall be provided for collection of filtrate and its conveyance.
After completion of the filtration cycle provision for drying of cake by air compaction shall
be provided.
The hydraulic opening and closing system shall include one double acting hydraulic
cylinder and one hydraulic power pack. The system shall be designed to automatically
compensate for any thermal expansion or contraction of the plate stack as well as
maintain the proper clamping force throughout the process cycle.
The hydraulic cylinder shall be capable of producing sufficient clamping pressure. The
cylinder shall be of the tie rod design. The piston rod shall be covered by a flexible bellow
to protect the rod from contamination and corrosion.
The hydraulic closure system shall consist of an electric motor driven hydraulic pump
control valve, hydraulic pressure relief valve, hydraulic reservoir, and hydraulic cylinder.
The hydraulic closure system shall be of a closed loop style. Press closing pressure shall
be automatically controlled by pressure switches. The relief valve shall be on reverse line
for pressure safety.
Controls
Control panel shall be provided at closing end of filter press. The PLC shall have 20%
spare IOs. the software to program PLC shall be provided.
The control panel shall provide either manual control or automatic control selector switch
in weatherproof enclosure. The panel shall include necessary starter, control relays,
timers. All components shall be prewired to a main numbered terminal strip. The
connection sleeve shall be punched.
The fuse terminal shall be provided with LED display for all solenoids.
Belt conveyor of suitable capacity and material of construction shall be provided for
handling dry solids for final disposal by trucks. The belt conveyor shall be complete with
suitable accessories like skirt board hopper, impact idlers, discharge chute etc.
Appropriate interconnecting pipework between filter presses and the accessories shall be
provided.
15.05.12 STANDARDS
Standards to be followed for pumps, valves, Sluice gates, pipes and fittings etc. are as
follows:
15.05.13 PENALTIES
01 Pumps
During testing each pump along with its auxiliaries shall be tested to establish the
following performance guarantee parameters.
ii) Energy consumed as measured at motor control centre, for each pump for the
above conditions shall not exceed the values quoted during the tender stage.
iii) Noise level at 1 meter from pump casing not exceeding 70 dBA.
iv) Vibration level of pump measured throughout the regime of pump operation shall
be in accordance with the specified international standards.
02 Cascade Aerator
b) Cascade Aerator delivering the water containing iron up to 0.2 ppm (as Fe) is
acceptable without penalty.
b) Cascade Aerator delivering the water containing iron up to 0.3 ppm are acceptable
with penalty.
d) The penalty shall be levied at the rate of 1% of the contract value of Cascade
Aerator for every 0.1 ppm increase of iron in treated water beyond 0.2 ppm
b) Cascade Aerator delivering the treated water containing iron more than 0.3 ppm is
not acceptable.
03 Clariflocculator
d) The penalty shall be levied at the rate of 1% of the contract value for every 1 ppm
increase of suspended solids in filtered water beyond 25 ppm
b) Filters delivering the filtered water containing suspended solids up to 5 ppm are
acceptable without penalty.
c) Filters delivering the filtered water containing suspended solids (scale) in the range
of 5 to 10 ppm are acceptable with penalty.
d) The penalty shall be levied at the rate of 1% of the contract value of filters for every
1 ppm increase of suspended solids in filtered water beyond 5 ppm
e) Filters delivering the filtered water containing suspended solids more than 10 ppm
are not acceptable.
The Tenderer shall submit the offer alongwith the following drawings/schematic diagram
and documents for the water treatment plant.
u) Details of software package for real time trend & historical trends.
v) Technical particulars/literature/catalogues.
w) Process and Instrumentation (P&I) diagrams for each shop/unit indicating all the
field and control room instruments using ISA symbols.
x) List of Instruments clearly indicating measuring principle of the instruments and
whether the said instrument is local gauge, transmitter, and switch or control
room panel mounted.
y) Requirement of Electrical Feeder specifying voltage and current rating.
The following design data, drawings & documents shall be submitted by the successful
tenderer in required copies within six weeks of issuing Letter of intent, for approval of the
Purchaser/Consultant.
b) Process and instrumentation diagram indicating location of all instruments, alarm and
interlock functions using ISA symbols.
d) Layout of piping with plan & sectional views indicating pipe routing, location of supports,
valves and other fittings, as required.
g) Test procedures for preliminary and final acceptance and guarantee tests.
i) Overall schedule indicating all activities such as supply, erection, testing and
commissioning of the plant.
k) All relevant design calculations and supporting documents alongwith projected design
water quality for the treatment plant.
i) Material test certificate for all major equipment and their components.
n) SLD of power distribution , general view, layout drawings with complete dimensions,
weights, foundation details, details of cable openings etc of MCC and accessories etc.
o) Power and control scheme of all the feeders.
p) Bill of material of all panels.
q) Front view with list of inscription.
r) External and internal views with door closed and open condition .
s) QAP
t) Piping and instrumentation (P&I) diagram using ISA symbols.
u) General arrangement drawings of cabinets, consoles, cubicles, desks, peripherals etc.
with sectional views, dimensional and fabrication details.
v) Single line power supply with specifications and bill of quantities of electrical accessories
for instrumentation and control equipment.
w) Bill of quantities of material consolidating loop wise specification of all instrumentation
equipment indicating make, model no., scale range, application, location in tabular form.
This shall also include panels and cabinets, cables, electrical accessories.
x) Specification data sheets included in the specification shall be properly filled in and
submitted with detailed technical literature. The relevant model no. of each instrument
offered should be marked on the technical literature.
y) Quality Assurance Plan for each instrument.
e) Lubrication schedule and quantity and quality of lubricant for one year's normal operation.
f) Schedule of chemical consumption and quantity and specifications of chemicals for one
year's normal operation.
k) "As-built" drawings.
o) Warranty/guarantee certificates.
y) Earthing schemes
bb) Operation and maintenance manual for all the components of the MCC.
dd) Terminal plan, wiring and interconnection diagrams for cabinets, cubicles, junction boxes
etc.
gg) Design data, sizing calculations and fabrication/ assembly drawings for all the flow
sensors. These shall be supported with relevant charts, tables, curves etc., as applicable.
hh) Schedules and specification of all types of instrumentation cables, impulse and protection
pipes.
ii) Test calibration and guarantee certificates for all the instrumentation and control
equipment.
jj) Operation and maintenance manuals for all instrumentation and control equipment.
kk) Quality and quantity of electrical power for instrumentation and control equipment, as
required.
The contaminated water from the gas cleaning plant shall be treated in the Effluent
Treatment Plant (ETP) comprising primarily the thickener units using alum as coagulant,
polyelectrolyte as flocculent and lime for pH correction. Hydraulics of the system shall be
so designed that the clarified water from the thickener will be gravitated to the cooling
tower top. The underflow sludge from the thickener shall be pumped to two nos. sludge
storage tanks, a separate group of pumps shall be provided for disposal of slurry from the
storage tanks.
The slurry pumps along with the facilities for chemical storage and coagulant/ flocculent
dosing and pH correction shall be housed in the sludge pump house-cum-chemical
house to be located near the thickeners.
The design parameter of the slurry from the gas cleaning plant to be treated in the ETP is
furnished in this document.
16.01 GENERAL
Effluent Treatment Plant shall essentially comprise, but not be limited to the following
units/facilities:
Sl.
Description Quantity (Nos)
No.
1. Flash mixer complete with mixer blade, shaft, gearbox, 2 nos
motor, base plate, supports, etc.
2. Sluice gates 2
3. Thickener complete with raker arm, lifting device, feed
well, approach bridge, drive motor gear box, limit 2 nos
switches, common base plate, etc.
4 Underflow slurry pumps in Ni-hard construction complete 2 nos
with drive motor, base plate coupling, coupling guards,
bolts, nuts, gaskets, etc.
5 Sludge storage tank with agitator mechanism complete 2 nos
with paddle, shaft, motor, gearbox, base plate, platforms,
handrails, etc.
6 Alum agitator with MSRL tank, drive motor, coupling, etc. 2
7 PH correction chemical agitator with MS tank, drive 2
Sl.
Description Quantity (Nos)
No.
motor, coupling, etc.
8 Flocculants agitator with MSRL tank, drive motor, etc. 2
9 Metering pumps with drive motor 6
10 Slurry transfer pumps in Ni-hard construction complete
with drive motors, couplings, etc. 2
13. Complete dewatering plant (as per drawing no 114) 1 set
14 Dry solid disposal conveyor complete with all aceessories 1 Set
and drives
15 Dry solids Bunker including all electro-mechnical 1 set
accessories like gates etc.
16 Plug valves, ball valves, gate valves and non return 1 lot
valves
17 Carbon steel slurry pipelines (heavy grade), service
water pipelines (medium grade) and drinking water
pipelines (GI, medium grade) 1 lot
18 Weighing machine in chemical house 1
19 Sealing water pumps As required
20 Materials handling facilities As required
21 Instrumentation 1 lot
22 Ventilation system 1 lot
23 Structural supports, hand railing, etc. 1 lot
24 Electrics 1 lot
• Slurry Launder
Carbon steel slurry launder complete with walkway, hand rails and structural
support, shall be provided from the discharge point of Gas Cleaning Plant up to the
ETP. The cross-section and the slope with available level constraints shall be so
designed as to ensure a self-cleansing velocity (min. 1.5 m/s) to avoid deposition of
solids at the launder bottom. The minimum free board shall be 300 mm to avoid
spillage of slurry during plant operation.
• Flash Mixers
Two units of RCC flash mixers (one for each thickener) with structural ladders,
platforms, hand railings, etc. shall be provided two allow 60 seconds mixing time
with the dosing chemicals. The outflow channels with walkways of removable
chequered plates leading to thickeners shall be provided with gates to control/cut
off the supply to thickeners. Local type pH measurements shall be provided before
and after the chemical dosing. Bowl classifiers shall be provided upstream of
clarifloculators to prevent heavier particles entering the clariflocculator and remove
them there itself. Bowl classifiers shall be complete with slurry collection and its
conveyance arrangement to press-filter / rotary drum filters.
• Thickeners
Each thickener shall have capacity to treat 100% of the total effluent from the gas
cleaning plant. When one of the thickeners is under shutdown the other one should
able to take full load. The thickeners shall be of central drive type. The raker arm
mechanism with gear reduction unit shall be provided. In the event of the raker arm
getting jammed, audio visual signals shall be available at the sludge pump house
control panel. The raker arm shall be provided with lifting device (electro-
mechanical type). Working position of the thickener shall also be depicted in the
pump house. After encountering maximum torque limit, the raker arm shall lift
automatically by 300 mm and continue to rotate in the lifted position. At the preset
torque level, the raker drive motor shall trip.
Sludge chamber shall be provided with manually operated plug valves to connect
to the pump suction lines. Portable type local pH meter shall be provided to
measure the pH of the clarified water.
(i) A two-storey building shall be provided in which the ground floor shall be used for
storing chemicals, locating M.C.C. and slurry pumps. The first floor shall be used
for preparation of chemical solutions and dosing.
(ii) Two slurry pumps (one working and one standby) shall be provided for each of the
two thickeners. The capacity and head of the pumps shall be decided based on
the sludge characteristics. The sludge pumps shall be of non- clog type horizontal
centrifugal in Ni-hard construction having minimum hardness of 500 BHN. Other
specification of the slurry pumps shall be as specified earlier in this document.
(iii) Slurry pumps will take suction from the side of the thickeners.
(b) All valves for slurry operations shall be plugs plate knife edge valves. Electrically
operated valves, if any, shall have local and remote operations.
c) The unintentional tripping of the drive motors, jamming of valves, etc. shall be
accompanied by visual signal at the pump house control panel.
(d) Industrial water connections for flushing the pumps, pipe network and valves after
completing the cycle of pumping.
(a) The storage and handling facilities for the chemicals at the ground/ first floor shall
have capacity for at least 60 days’ consumption.
(b) Each of the solution tanks shall have a capacity of at least 8 hrs consumption.
(c) Metering pumps with SS internals shall be used for dosing the chemical solutions
to the inflow channel/flash mixer. Two pumps (one working & one standby) shall be
provided for each of the dosing schemes. The valves shall be of anti-corrosive
type.
(d) Each of the solution preparation tanks and solution handling tanks shall be
provided with mechanical agitators with electric drive. The solution preparation and
holding tanks shall be of interchangeable type.
(e) The agitators of the solution tanks, chemical pumps shall have both local and
remote controls. The operating position of these shall be indicated in the control
panel of the pump house.
(f) Thickener overflow channel shall be designed with a provision to bleed off extra
overflow, if any, into the area drainage networks as and when required.
• Ventilation Facilities
Wall-mounted propeller fans of adequate capacity shall be provided for general air
exchange and for dissipation of heat generated in the following premises:
The following materials handling facilities shall be provided in the Chemical House-
Cum-Slurry Pump House:
i) 1-tonne capacity electric hoist in the slurry pump house at the ground floor.
ii) 1-tonne capacity electric hoist in the chemical solution preparation room at the first
floor.
General
As part of the ETP, a sludge dewatering plant shall be provided for handling the
underflow sludge from the thickeners.
The sludge dewatering plant shall be capable of producing filter cake of low moisture
consistently. Suitable mode of filter cake discharge shall be provided under the sludge
dewatering plant so that the filter cakes can be conveyed by trucks for final disposal.
The dewatering station shall be PLC controlled and operated from a control room located
in the chemical house of ETP.
Design Criteria
The sludge dewatering plant shall consist of either 2 nos of plate & frame type filter
presses complete with all ancillary equipment and interconnecting piping or Rotary
Vacuum Drum Filter/ Disc Filter with required accessories.
i Vacuum Receiver
ii Moisture Trap
Plate & frame type filter presses type sludge dewatering system shall be suitably
designed so as to conform to the following requirements:
The Filter presses together shall be suitable for continuous dewatering of the entire
underflow sludge received from the two thickeners.
The filtrate from the dewatering station shall be led back to the thickeners.
Filter Press
The capacity shall be provided for general air exchange and for dissipation The filter
press shall conform to DIN # 7129 and shall be of horizontal / vertical configuration.
The filter press shall have high hydraulic capacity and shall be designed for dewatering
the slurry efficiently with proper handling and disposal facilities for dry cake and 100%
removal of filtrate, eliminating all blowback and residual lockup of filtrate.
The overall operating cycle time for each press shall be not less than1hour.
The filter fabric shall be capable of handling the desired slurry with appropriate weave,
breaking strength, air permeability and long durability. The filter cloth shall not warrant
any special cleaning. The filtering area shall be optimum.
The material of construction of the components of filter press shall be matching with the
duty conditions. The filter press shall be completely assembled on an integral structural
base.
Smooth sliding of plates over tie bar shall be ensure by suitable arrangement.
Cam arrangement shall be provided for enabling jerking action on the cake for dislodging
it to the conveyor / hopper installed below the press.
The resulting filter cake shall be consistently thick with low moisture content. Suitable
cam arrangement shall be provided for dislodging of cake to the hopper located below
the filter presses.
The filter press structure shall consist of feed head, moving plate, end plate and tie bars.
The structure shall be MS fabricated of structural steel. The moving plate shall be
mounted on the tie bars by means of rollers.
The filter press frame shall be strong enough to withstand forces of hydraulic cylinder
during the operation of press.
Suitable coupling shall be provided for minimizing misalignment between the movable
head and ram.
Tie bars shall be designed in such a way so that they remain straight and rigid. Tie bars
shall be keyed to the feed head and end plate.
The structure of the press shall be fabricated suitably for providing adequate distribution
of static loads.
Drip tray shall be made up of MS 2mm thickness with hard rubber lining. The proper
sealing between the joint of door shall be done to avoid spillage.
Filters tray shall be shall be constructed in MS with hard rubber lining of 3mm thickness.
Filter plates
Plate shall be rigid in construction for withstanding fluid pressure and hydraulic oil
pressure for tightening during operation of press.
Filters plate shall be of the center feed, four-cornered. Handles shall be provided on the
sides of the plates for getting suitable support from tie bars.
Plate material and filter material shall be selected by the tenderer considering the
pressure, temperature and analysis of the influent slurry.
Air manifold
A manifold shall be provided to allow air blowing through the press for removal of residual
moisture at the end of the filtration cycle. Individual control valves for each of the corner
discharge port shall be provided for the filtrate collection header. A common discharge
header shall be provided for collection of filtrate and its conveyance.
After completion of the filtration cycle provision for drying of cake by air compaction shall
be provided.
The hydraulic opening and closing system shall include one double acting hydraulic
cylinder and one hydraulic power pack. The system shall be designed to automatically
compensate for any thermal expansion or contraction of the plate stack as well as
maintain the proper clamping force throughout the process cycle.
The hydraulic cylinder shall be capable of producing sufficient clamping pressure. The
cylinder shall be of the tie rod design. The piston rod shall be covered by a flexible bellow
to protect the rod from contamination and corrosion.
The hydraulic closure system shall consist of an electric motor driven hydraulic pump
control valve, hydraulic pressure relief valve, hydraulic reservoir, and hydraulic cylinder.
The hydraulic closure system shall be of a closed loop style. Press closing pressure shall
be automatically controlled by pressure switches. The relief valve shall be on reverse line
for pressure safety.
Controls
Control panel shall be provided at closing end of filter press. The PLC shall have 20%
spare IOs. the software to program PLC shall be provided.
The control panel shall provide either manual control or automatic control selector switch
in weatherproof enclosure. The panel shall include necessary starter, control relays,
timers. All components shall be prewired to a main numbered terminal strip. The
connection sleeve shall be punched.
The fuse terminal shall be provided with LED display for all solenoids.
Belt conveyor of suitable capacity and material of construction shall be provided for
handling dry solids for final disposal by trucks. The belt conveyor shall be complete with
suitable accessories like skirt board hopper, impact idlers, discharge chute etc.
Appropriate interconnecting pipework between filter presses and the accessories shall be
provided.
i) Flow rate :*
ii) Total suspended solids : 4000 – 8000 ppm**
iii) pH : 7.3 – 8.1**
iv) Temperature : 60-70 deg. Celsius**
v) Pressure at discharge point : by gravity at about + 10**
m level.
Analysis of suspended solids**
a) Fe2O3 : 71.42%
b) SiO2 : 5%
c) Al2O3 : 1.4%
d) CaO : 6%
e) MgO : 3.2%
f) P : 0.016%
g) S : 0.483%
After completion of erection, cold tests and hot trial runs and fulfillment of performance of
individual equipment and systems, the integrated system performance guarantee tests
shall be conducted by the Contractor to establish the rated output, quality of treated
effluent and power consumption of the Effluent Treatment Plant.
Should the performance values fall below acceptable level, the unit/sub-unit/equipment
shall be rejected by the Purchaser and the Contractor shall be liable, at the option of the
Purchaser, either to replace the unit/sub-unit/equipment or to pay compensation in
addition to the liquidated damage as per the contract or as may be agreed upon.
i) Total suspended solids (TSS) content of the treated effluent from the ETP shall not
exceed 50 ppm.
ii) Energy consumed as measured at motor control centre of the ETP shall not exceed the
values quoted during the tender stage.
iii) No negative tolerance shall be permissible on capacity and quality of the treated effluent
from the ETP. Further, no positive tolerance shall be permissible for power consumption
of the Plant.
The following drgs, curves and information shall be submitted with the proposal for proper
evaluation of the tender. Tenderer giving incomplete information shall not be considered.
d) P & I diagram
e) Data sheets for thickeners, flash mixers and sludge agitators, various
tanks and vacuum filters.
i) Settling time
m) Technical data sheet for the all equipments and drives, instruments.
o) Bar chart showing the complete activities involved in executing the project and their
schedule.
a) Design calculations of the complete system within the scope of the tenderer.
d) Dimensional drawings of the various units & components of the treatment plant
Oil skimmer shall be floating continuous tube type with cantilever boom arrangement.
The oil skimmer shall be designed to continuously move the collective tube over the
complete width of each compartment of scale pit and secondary settling tank.
The oil skimmer shall be dual tube designed so that it can be used for skimming of two
separate compartments simultaneously.
The oil skimmer should consist of MS Vertical Mast, Cantilever Boom with Swivel
0
arrangement suitable for 360 rotation. Cantilever Boom should be fixed to the Vertical
Mast on one side and Tube type Oil Skimmer is mounted on the other side.
The oil skimmer main body/ Housing of the Oil skimmer should be made from weather
proof aluminum casting.
The oil skimmer tube should be made from Oleophyllic polymer and scrapers should be
made from high abrasion resistant ceramic.
Oil scraped from the tube will be gravitated into the container located at 0.00 level
thorough a pipe.
The Tenderer shall furnish the following documents along with the tender:
- Technical particulars of each type of Oil Skimmer (including motor) as per information
indicated in technical specification
- List of special tools and tackles, instruments and accessories required for assembly
and testing at site till preliminary acceptance.
- List of special tools, tackles and other accessories required for erection.
- List of initial fill of lubricants, flushing oil and other consumables with quantities.
- List of tests proposed to be done at shop and site before preliminary acceptance.
- Inspection and testing procedure and details of shop tests for various
components, sub-assemblies of all the pumps and motors.
- All characteristic curves of motor including speed torque curve of the motor
- Terminal box GA drg. With details of cable size suitable for AYY type cable
termination.
b) Feed back data/drawings (Within four to six weeks after placement of order)
- Civil design data and drawings showing bolt hole locations, pocket sizes load,
level of top of bolts and grouting thickness below the base plate. The drawing
shall indicate the level of base, position for anchor pockets, inserts if any, to be
embedded in the concrete and other details enabling the Purchaser to design the
civil foundation.
- Part nos. and description of spares parts. (Within eight to ten weeks after
placement of order)
- As built drawings.
- One set of reproducible and two copies of CD’s all’ As built drawings’ for all
equipment shall be submitted along with required sets of prints (to be supplied at
the time of dispatch of equipment.
18.01 The contractor shall provide Pressure Filters for scale water cycle, Side Stream Filters for
Indirect Cooling Circuit and Filters for Makeup Water as required with the following
accessories
The tenderer shall also provide the entire piping (headers & branches)
a) for the backwash water from the backwash water over head tanks
b) for the air pipelines from Blowers to Filters
c) waste water from the filters to the Waste Water Sump
d) Nitrogen/Instrument Air pipeline from 5m outside the shop to all pneumatic
operated valves.
e) make-up water (unfiltered) pipeline 5m outside the shop to all the Filters for
Make-up water.
f) Filtered water make-up line from the filters to the Filtered water sump.
All termination points shall be flanged end connection and matching flanges are to be
provided by the tenderer
a) Thickness indicated for shell and heads shall be minimum specified thickness after
forming.
b) Pressure for each vessel, shall be specified in the following manner:
i) Operating pressure
ii) Design pressure: Design pressure will be reckoned at the top tangent line of a
vertical vessel and at the highest point of a horizontal vessel and will be 10% or
minimum 1 kscg more than the maximum operating pressure up to 70 kscg
operating pressure, the design pressure shall be 5% more than the maximum
operating pressure. The design pressure at any lower point is to be determined
by adding the maximum operating liquid head and any pressure gradient within
the vessel.
iii) Vessel operating under vacuum shall be designed for an external pressure of
2
1.055 kgf/cm absolute.
iv) First test pressure unless otherwise specified on the drawing, should be at least
equal to 1.5 times the maximum allowable pressure when the vessel is new and
cold provided it does not exceed 90% of the yield point of the material of
construction of any part of vessel.
d) Corrosion Allowance
i) The maximum corrosion allowance for carbon steel and low alloy vessel shall be
1.5 mm unless otherwise specified on the data sheet.
ii) The corrosion allowance shall be added to one side of tray support rings and
other fixed internal non-pressure parts when exposed to corrosive liquid or
atmosphere.
iii) For alloy, lined or clad vessels no corrosion allowance is required on the base
metal behind the alloy. The cladding or lining material (in no case less than 1.5
mm thickness) shall be considered as corrosion allowance for clad plate.
iv) The corrosion allowance for nozzles and manholes shall be at least equal to that
specified for vessel shell.
v) Cladding or lining thickness shall not be included in strength calculations unless
specifically indicated on the drawings.
The pressure filters of the scale water cycle, Side Stream Filters for Laminar Cooling
Circuit, Side Stream Filters for Indirect Cooling Circuit and Filters for Makeup Water
Circuit and the connected equipment shall be designed, manufactured and tested as per
relevant IS/IPSS or as per other international standards acceptable to the Purchaser and
shall be suitable for the duty conditions and capacities as indicated.
The surface loading shall be decided as per quality requirement of filtered water but shall
3 2
not exceed 25 m /hr/m incase of Scale Removal Filters, Side Stream Filters for Laminar
3 2
Cooling Circuit and 10 m /hr/m in case of Side Stream Filters for Indirect Cooling Circuit
and Make-up water Filters.
The design, fabrication, inspection and testing of the pressure filter shall conform to IS:
2825- 1969 (RA 1984).
At least 60% of free board shall be left over the filtering media.
The pressure filters shall have air scouring facility prior to back washing.
Back wash cycle for each filter shall be generally once in every 24 hrs, the same shall be
commensurate with the other vessels, if any, of the system. Over Head Tank with 4
compartments and required capacity having staging height of 15 m shall be provided for
back washing of filters. The tenderer shall provide the complete piping from the
backwash water tank to all the filters for supplying the back wash water. The tenderer
shall provide the complete piping from the filtered water headers to fill the respective
compartments of the backwash water Over Head Tank with filtered water. The tenderer
shall also provide drain and overflow pipelines with valves for all the back wash tanks.
Suspended solids content in the filtered water shall not exceed 5 ppm.
The piping system and control valves shall be provided in front of the vessel for smooth
operation. The same shall include contaminated water inlet, filtered water outlet, back
wash inlet, waste water outlet, drain, air scouring and air vent.
Pressure filters shall be provided with access manholes for filling and charging of gravel,
sand and for maintenance purposes.
Pressure filters shall be of vertical type and shall be provided with built in legs with proper
supports to the concrete.
The filter shall be provided with unfiltered water distributors and header lateral type
under-drain collecting system.
Maximum pressure loss across the filters should not be more than 8 mWc.
18.02.02 Blower
The air blowers shall be complete with drive motor, base plate, coupling, coupling guard,
bolts, nuts and gaskets.
The air blower shall be of oil free type and its material of construction shall be CI.
The capacity and pressure of the air blower shall be decided to suit the requirement of
the filters.
Blower motors shall have a minimum of 15% margin over the rated bhp.
MS Pipes: As per IS:1239 Part I (Medium)- 1990 (RA 1995) for pipes upto dia 150 mm
and for pipes of sizes higher than 150 mm the following shall be followed.
Fittings : As per IS: 1239 Part II - 1992 for dia upto 150 mm and fittings shall be
fabricated from parent pipes for dia 200 mm and above.
18.02.04 Valves
As indicated at 10.00
Plate flanges having raised face shall be provided for all the valves and they shall be of
mild steel and dimensions & drilling shall conform to the relevant table of IS: 6392 - 1971
(RA 1998).
Black bolts and nuts confirming to IS:1363 - 2002 (Old Std. 1992 - RA 1998) shall be
provided for the companion flanges.
Rubber gaskets conforming to IS:638-1979 (RA 1998) shall be provided for the
companion flanges.
Technical information of the pressure filters, blowers, motors, valves, instrument as per
the format given in this specification.
G.A and cross sectional drgs. of the Filter House showing the disposition of various
vessels, Blowers, Waste water sump, Backwash Tank, frontal piping, headers, etc with all
dimensions
G.A and cross sectional drgs. of the pressure filters, blowers, valve and motor details.
Predicted performance characteristic curves of the blowers (Not the family curve)
including power and efficiency curve.
The tenderer shall furnish basic design calculations for sizing of pressure filters etc. for
achieving the required water quality.
List of special tools, tackles and other accessories required for erection.
List of all special tools and tackles and accessories required for start-up, commissioning
and establishing guaranteed parameters.
List of initial fill of lubricants, flushing oil, filtering media and other consumables with
quantities.
List of tests proposed to be done at shop and site before preliminary acceptance.
Proposed tests methods and standards to be followed for vibration and noise
measurement. A copy each of the standards shall be furnished.
Recommended no. of the Contractor’s supervisory personnel and duration of their stay at
site required for supervision of erection of equipment under each stage.
The following technical information shall be furnished along with the tender.
Sl.
Description To be filled in by tenderer
No.
1. Shell dimension: diameter and length, mm
2. Vessel design code adopted
3. Design pressure, kg/cm2
2
4. Hydro-test pressure, kg/cm
5. Guaranteed output between two successive
backwash
6. Guaranteed effluent quality
7. Flow rate, m3/h
Normal
Maximum
Backwash
Rinse
8. Head loss through bed, mWC
Sl.
Description To be filled in by tenderer
No.
Normal
Maximum
Backwash
Rinse
9. Filter Materials
Type
Size of grading, mm
Quantity per filter, m3
Life of filtering material year
10. Bed depth and free board provided
11. Time required for backwash
12. Time required for rinse
Minimum
13. Material of construction of vessel
14. Type and material of inlet distributor and
under drain system
15. Material and detail of nozzle
16. Filter shell and dished End thickness, mm
17. Flooded weight, kg
18. Empty weight, kg
19. Compressed air requirement and pressure
20. Time of air scouring in min.
18.04.02 BLOWER
The Contractor shall furnish the following data/documents / drawings within the time
stipulated. The title block along with drawing numbering system to be followed for
preparation of drawings will be communicated to the successful Tenderer after placement
of order. The Contractor shall follow the system with out fail. Drawings without the
prescribed numbering system and title block shall be liable to rejection and the same
shall be treated as not submitted.
- Civil design data and drawings showing bolt hole locations, pockets sizes,
dynamic and static load, level of top of bolts and grouting thickness below
the base plate. The drawing shall indicate the level of base, position of
anchor pockets, inserts if any, to be embedded in the concrete and other
details enabling the Purchaser to design the civil foundation.
Part No. and details for spare parts including drawings and specifications for wearing ring
impellers, shaft etc. as per the list of required spares
Size in mm Distribution %
5 to 3 0.0009
3 to 1 0.0568
1 to 0.5 0.1257
0.5 to 0.2 0.7284
0.2 to 0.1 0.8000
below 0.1 400 to 1000
TDS 400 to 1000
*The above figures are indicative only. Final figures shall be given by equipment supplier.
pH = 7 to 9
Total hardness = 300 mg/1
Suspended solids (scale) = <5 ppm
Oil + grease = nil
19.02 The sludge scrapper assembly shall be complete in all respects and shall broadly
consist of the following components.
I) Truck assembly
II) Bridge assembly with bridge drive and hoist drive assembly.
V) Control panel.
VI) Cabling
The tenderer shall submit the following along with the tender:
a) filled – in data sheet (see Annexure –A)
b) GA and cross sectional drawing of equipment.
c) Material of construction.
d) List of sub-suppliers for bought-out items.
e) Write –up on control scheme.
f) Quality Assurance Plan filled in prescribed proforma
g) List of drawings proposed to be submitted for approval
h) List of spares recommended for 2 years of normal operation and their price.
i) The tenderer shall furnish basic design calculations for sizing of equipment.
j) Catalogues for each equipment duly identifying the model.
k) List of special tools, tackles and accessories required for assembly and testing at
site till preliminary acceptance.
l) List of special tools, tackles and other accessories required for erection.
m) List of all special tools and tackles and accessories required for star-up
commissioning and establishing guaranteed parameters
n) List of initial fill of lubricants, flushing oil and other consumables with quantities.
o) List of commissioning spares.
p) List of tests proposed to be done at shop and site before preliminary acceptance.
q) Proposed test methods and standards to be followed for vibration and noise
measurement. A copy each of the standards shall be furnished.
r) Indicated whether equipment will be delivered completely assembled or whether it
will be assembled at site.
s) If assembly is at site, proposed number of sub-assemblies and packages.
20.01 CHEMICALS
• Suitable Iron dispersant / anti foulants etc. may be blended in the chemical if
required for any particular system.
• The chemicals shall be continuously into the circulating water by metering pumps
at the required dosage rate.
Tenderer shall indicate the trade name, composition, appearance, odor, pH optimal, pH
after dosage, solubility gravity dosage, feeding dosage, solubility, specific gravity dosage,
feeding procedure at feeding points of the deposit control agent.
B) Corrosion inhibitors
Suitable corrosion inhibitors shall be used for the control of corrosion in open re-
circulating cooling water systems. The corrosion inhibitor shall be fed to the re-circulating
water, wherever found necessary, by means of a metering pump. Corrosion resistant
feeding equipment shall be used.
Tenderer shall furnish the trade name, composition, appearance, specific gravity, pH
recommended dosage, optimal pH after dosage, solubility, freezing point, feeding
procedure and feeding points of the corrosion inhibitor.
C) Anti-foulants
Suitable anti-foulants shall be applied for the prevention and removal of iron oxide and
other metallic oxides in the water re-circulating systems wherever found necessary. The
anti-foulant shall have good dispersing properties.
Tenderer shall furnish the trade name, composition appearance, pH specific gravity,
solubility, freezing point, recommended dosing rate, feeding procedure and feeding
points of the anti-foulants.
D) Biocides
Suitable biocides shall be provided for the control of bacterial, fungal and algal growth in
the re-circulating cooling water systems. The biocides shall have good solvablising and
dispersing properties to ensure good distribution throughout the system and efficient
penetration of the slime masses, to the encountered. Dosing rate and dosing points shall
be judiciously selected taking the following factors into consideration:
i) The nature and extent of the anticipated microbiological contamination for the
different re-circulating water systems.
Tenderer shall furnish the trade name, composition, appearance, odour pH, solubility,
freezing point, recommended dosage and procedure of feeding for the biocide.
• Two types of biocides shall be provided for dosing into each system. Each type
of biocide will be dosed alternately.
• The biocides will be dosed manually in the basin of the cooling tower.
• The biocides shall be selected considering slug dosage after every 15 days.
• The tenderer shall provide all the monitoring chemicals required for monitoring of
system variables which control the dosage of chemicals.
• The system variables will be measured three times a day i.e. once every shift.
• The tenderer shall clearly furnish the list of chemicals along with quantity of
monitoring chemicals proposed for the system.
• These chemicals shall supplied in Kits. Each kit shall have all required chemicals
and measuring jars and instruments etc. for monitoring the variables. One such
kit shall be supplied for each of the pumphouse.
The dosing chemicals shall preferably have a minimum shelf life of one year. The
chemicals shall not degrade while storage in an ambient temperature of 50 0 C.
The chemicals shall not inflame when exposed to sunlight / naked flame.
The chemical shall not produce excessive fumes and odor which are harmful to human
beings.
The material of carbuoys and drums shall be chemically non reactive to the chemical
stored in it.
A structural platform shall be provided by the Contractor in the pump house for stationing
the dosing pumps. This platform shall be constructed at a suitable height so that either
200 lit. drums or small carbuoys can be stationed below the platform and the dosing
pumps shall draw the liquid from the drums / carbuoys and pump it through the pipelines
upto the dosing point.
All chemicals for scale and corrosion inhibition are required to be dosed continuously at a
constant rate and shall be dosed by metering pumps.
2 Nos. metering pumps (1 working & 1 standby) shall be provided for each chemical. No
dosing pump shall be provided for biocides.
Pump flow rate shall be adjustable from zero to 100 percent of the specified rated
capacity even while the pump is in operation. The stroke adjuster shall have requisite
graduations to indicate the set flow rate and shall be fitted with a locking arrangement so
that the preset capacity does not change during pump operation. It shall also have
suitable internal stops to prevent its detachment at settings below zero percent and
above 100 percent.
Pumps shall be driven by electromagnetic power unit consisting of an epoxy molded coil.
The capacity of pump each chemical shall be decided by the tenderer depending on
recommended dosage.
20.05 PIPING
A piping network between the dosing stations and the dosing points shall be provided by
the tenderer.
The tenderer shall supply & install all monitoring apparatus like corrossion coupons,
slides for bio testing etc. required for proper monitoring of each system.
20.07 REPORTS
Test Reports
The test reports shall be furnished at an interval of every 2 months. The report’s contents
shall cover but not limited to the following items :
a) Predicted performance curves for the system with respect to corrosion rates and
scale deposits
c) The details of variation in the various critical parameters being monitored in each
shift for the previous period.
d) The dosage rate maintained during the period and its variation.
Monitoring reports
The monitoring reports shall be submitted every 4 months interval. The monitoring report
shall include but not limited to the following :
The control panel will be common for all the Chemical Dosing pumps of one dosing
system and shall be suitable for mounting inside the Pump House Bay. The control panel
shall be made of 2.5 mm thick CRCA sheet steel with IP-55 enclosure and shall be of
floor / wall mounted type. The Chemical Dosing Pumps shall work in LOCAL made as per
the control philosophy offered by the Tenderer.
The tenderer shall ensure that the pre-cleaning chemical at the designed rate is being
dosed in the flushing water during flushing of the circulating water pipelines.
The tenderer shall ensure that the Chemical quantity in the water during initial filling of
circulating water pipelines is as per the designed quantity to ensure proper passivation of
the piping network.
During normal operation the tenderer shall ensure proper dosage of chemicals inside the
circulating water.
All the manpower, equipments, consumables and chemicals required during testing,
commissioning and normal operation shall be provided by the tenderer.
20.11 MAINTENANCE
The tenderer shall operate and maintain the complete chemical dosing system for a
period of three months from the date of successful commissioning. All necessary
chemicals, consumables, spares, tools and tackles and manpower required for operation
and maintenance during this period shall be provided by the tenderer under his
Contractual obligations.
Uniform corrosion rate of 5 mpy maximum for steel components and 0.5 mpy for non
ferrous components.
In case, the treatment programme provided by the tenderer fails or requires additional
chemicals to achieve the guaranteed performance, the tenderer shall supply the
necessary additional chemicals and shall undertake suitable measures for the successful
execution of the modified programme without any additional cost implication to the
Purchaser. In case, the modified programme requires lesser dosage of the chemicals
than originally quoted, the payment shall be made on the basis of the actual consumption
of chemicals.
The tenderer shall furnish the following documents along with the offer.
Scheme of dosing of each chemical for each circuit showing the parameters of pumps,
dosing rate, specification of chemicals etc.
Calculation for arriving at the total quantity of chemicals required for pre-cleaning,
passivation and regular dosing per day.
List of similar installations where the offered chemicals have been used along with
achieved corrosion rates.
Catalogues of the pumps, pipes, valves and literature for the chemicals clearly indicating
the active group.
For Approval :
- Design calculation of the complete system within the scope of the tender.
- Schematic diagram of the dosing systems indicating clearly the battery limits and
scope of supply.
- Layout drawings of the dosing systems along with the cross sections and details
indicating the installation of various equipments and piping etc.
- GA and Cross sectional drawings for the pumps, dosing tanks, agitators etc.
- Equipment schedule and specification along with the catalogue and literature.
For reference
- Technical particulars.
The following codes shall be referred during the fabrication of pressure vessels and
tanks.
21.02 DESIGN
- Contractor shall furnish the capacity and design calculations for thickness of all
major components like shell, head, nozzles etc. for approval prior to
manufacture/fabrication. In case of any alteration in material or thickness,
Contractor shall seek Purchaser’s / Consultant’s written approval. For CS
vessels, the shell or head thickness exclusive of C.A. shall be taken, even if
pressure/ load requirements may suggest lower thickness. Non pressure carbon
steel parts (e.g. skirt, lugs, Cleats, etc.) shall have a provision of 1.5 mm
corrosion allowance.
- Plates shall be bent along the direction of plate rolling for forming the cylindrical
components of vessel. Plates shall have only positive tolerances on thickness.
- Carbon content of C.S plate shall not exceed 0.25%. One product analysis per
heat shall be supplied.
- All vertical & horizontal vessels shall be provided with lifting lugs.
- All pressure vessels weld joints of category A and B shall be welded with full
penetration and full fusion. Welds shall be as per ASME Code Section VIII
Division 1, Table UW-12, NO.1.
VESSEL SUPPORTS
- The type of supports for vertical vessels shall be as indicated in the specification.
- Access opening in skirt, vent holes and piping opening shall be provided in
supporting skirt as per enclosed standard specification.
- Skirt and adjoining vessel shell outside diameter shall be the same.
- When the inside diameters of nozzles are specified, these shall be maintained.
When the inside diameters of manways are specified, it shall be considered as a
minimum.
- Nozzles, openings and their reinforcements shall be attached to the vessels with
complete penetration welds.
- Nozzle flanges shall be as per ANSI B 16.5 type and rating as specified.
Substitution of W.N. type flanges with Slip-on type will not be permitted.
- All manhole covers shall be hinged or provided with a davit along with suitable
lifting handle. Bolts, Nuts, Gaskets including spares shall be in Contractor’s
scope.
- External reinforcing pads shall have a minimum of one vent hole except those
pads for nozzles greater than 400 mm NB shall have a minimum of 2 vents and
nozzles in excesses of 900mm NB shall have 4 vents. Pads installed by sections
shall have at least one vent per section. All vents shall be tapped for future
plugging and plug shall have ¼” NPT connection (max).
- Class 300 flanges shall be used as a minimum, unless mentioned otherwise for
pressure relief valve connection.
- For heavy wall thickness vessels, integrally reinforced necks are preferred,
although long welding neck flanges and built-up construction are permissible.
- Where 125 Ra is specified for flange surface finish, the range for acceptance
shall be 63 Ra minimum to 250 Ra maximum. Finishes shall be judged by visual
comparison with surface finish roughness standards conforming to ANSI B46.1.
Where flange surface finish is not specified, it is the responsibility of the
contractor for the gasket specified. Fabricator shall ensure suitable protection of
flange faces, threaded connection, and machined surfaces, during transit.
- Lap joint flanges are not permitted in severe cyclic service. An example for sever
cyclic service is defined in paragraph 300.2 of ANSI / ASME B 31.3 piping code.
- All flanges intended for use with spiral wound metal gaskets shall be designed
using the manufacturers minimum gasket seating stress or the ASME Code
value, whichever is greater.
- The Contractor shall give special consideration for the prevention of over
stressing the flange or bolts during gasket seating, when class 300 and lower
flanges are used with spiral wound metal gaskets.
- All opening shall be cut off flush with the inside on the shell and the inside edge
shall be rounded.
- Internals like distributor piping, deflector, vortex breaker, tray support rings,
demisters etc. are in Contractor’s scope, including bolting and spares. Details of
demister such as make, make type etc. shall be subject to Purchaser’s /
Consultant’s approval during detailed engineering.
- Externals like manhole davit, pipe davit, insulation supports, Pipe supports,
stiffening rings, fire proofing supports, name plate, etc. are in Contractor’s scope,
unless mentioned otherwise.
- Sizes of nozzles for safety valve shall be indicated during approval of G.A
drawings by Purchaser/ Consultant. Contractor’s scope shall include supply of
nozzles with flanges, etc.
21.03 MATERIALS
- All materials used in the vessels shall be new and of the type and grade specified
in the specifications / drawings. All plates shall be supplied in normalized
condition.
- Materials of construction of vent stack and seat drum shall be selected as per the
requirement of NACE, MR-01-75.
- Internal support rings shall be of the same material as the shell in killed steel
vessels unless otherwise mentioned, except in lined portions of vessels where
they shall be alloy corresponding to the lining. They shall be continuously welded
on the top and stitch welded on the bottom when carbon steel and continuously
both sides when alloy.
- Plates form 16 to 50mm shall be ultrasonically tested as per SA 435 and above
50mm as per SA 578 for an Acceptance Level-1.
- All bought out items by fabricator shall meet the relevant inspection requirements
and test certificates.
21.04 FABRICATION
- Dished ends in vessels upto 2.0m shall be made in one piece. When a formed
head is made from more than one plate, it shall have a crown plate having
diameter greater than that of the reinforcing pad of any nozzle located at the
center of the head. The central part of cordial seam blank shall be atleast 50mm
or 3 times plate thickness away from the beginning of knuckle curvature. The
inside and outside surfaces shall be MP/DP examined for detection of cracks.
- Fabricator shall check for possible fouling / clash or attachments with each other
and with weld seams. Such fouling shall be resolved in consultation with the
Purchaser /Consultant.
- Skirt and other attachment welds shall have complete fusion for the full length of
the weld, and shall be free from undercut, overlap, or abrupt ridges or valleys. All
internal attachment welds shall be continuous, unless otherwise mentioned.
and the welding edges of dish ends of all thickness shall be checked by MP/DP
examination for detection or cracks, bruntations or segregations.
- Drawings and instruction for fabrication and installation or tray and mesh blanket
supports attached to the vessel shall be furnished by the appropriate supplier of
the vessels internals. The vessel attachments shall be installed in accordance
with the instructions, and specifications, by the vessel manufacturer. It is the
responsibility of the vessel manufacturer to supply, or cause to be supplied, all
materials required for the fabrication of the vessel attachments for the support of
internals.
- Insulation supporting lugs / rings / pins / studs at a pitch of 300 mm over vessel
surfaces shall be provided wherever applicable.
21.05 WELDING
a) All welding shall be done by a metal arc process. Only approved WPS, and
qualified welders shall be engaged.
- Circumferential welds shall be so located that visual inspection can be made with
all internal equipment in place.
- Seams in supporting skirts shall be made with full penetration butt welds.
Connections between skirts and vessel heads shall be made with a smooth flat
faced weld, unless otherwise shown. The width of the weld shall be atleast equal
to the skirt thickness, and its height shall be twice its width.
- All welding directly t the vessel shall be completed prior to final treatment.
- All welded joints for vent stack & seal drum shall be 100% radiographed. As a
minimum requirement all other pressure vessels shall be spot radiographed
(minimum 10%). Each spot radiograph shall be a minimum of six inches (152
mm) in length and in accordance with the ASME code. All welds to be covered by
nozzle reinforcing pads and at least one weld intersection shall be radiographed.
Non-radiographable welds shall be examined by magnetic particle or dye
penetrant as a acceptable alternative.
- For vessel shell thickness 2 inch (50 mm) and greater, 100% ultrasonic
examination is required in accordance with the ASME code, after final post weld
heat treatment.
- Vent stack & seal drum shall be stress relieved after welding to meet the required
hardness etc. as per the NACE stipulations.
- For carbon steel formed components, including dished ends, stress relieving
shall be performed as per ASME Section VIII Div. 1, (UCS – 79).
- In addition, cold formed carbon steel heads and knuckles shall be stress relieved
when their thickness is 16 mm or greater. Hot formed heads shall also be
normalised in case they are formed at temperatures below the normalizing range.
Hot formed dished ends or similar parts, which have not been uniformly heated in
the normalizing range in the final stages of manufacture shall be normalized.
- Vessels in caustic service, amine or sour gas service shall be stress relieved.
21.07 PAINTING
All uninsulated carbon steel surfaces shall be given two coats of epoxy zinc chromate
primer (P-5) with min. DFT of 35 microns per coat followed by two coats of acrylic
polyurethane finish coat (F-2) with min. DFT of 30 microns per coat.
- For insulated carbon steel surfaces, (i.e. Test storage tank) two shop coats of red
oxide zinc chromate primer (P-1) with min. DFT of 35 microns per coat shall be
given.
- Earthing lugs shall only be cleaned by wire brush and not to be painted.
- Sand blasting is not required for internal surfaces of vessels. Only wire brush
cleaning is required for the same. However, wherever internal surface painting has
been specified, i.e. in Test storage tank, sand blasting will be required.
• Mechanical design calculation, thickness calculations as per the design code for
shell & dished ends.
• GA drawings with part list and material of construction. Details break-up of weight
for each part shall be indicated in the detail fabrication drawing. Details of
bought-out i.e. make, type, etc shall be furnished.
• Filled in data sheets.
• Civil load data drawings with civil assignment (for reference)
• Fabrication drawings with internal components.
• Contractor shall furnish any special instruction for storage, handling & erection
for taking care by of the same by Purchaser
A) Commissioning spares
Commissioning spares as required shall be in the scope of supply of the Tenderer along
with the equipment. It shall cover requirement of trial runs and part testing also.
B) Consumables.
The Contractor shall supply consumables like first/initial fill of lubricants, oils, grease,
chemical, resins etc. as required to complete the plant till commissioning. The scope of
consumables shall include electrodes, shims, packing bolts, nuts, gaskets, rivets,
washers etc.
The Contractor shall also indicate monthly and annual requirement of all consumables.
The Contractor shall supply a complete and unused set of all the special tools and
tackles including required number of tool boxes as required for erection, maintenance,
overhaul or complete replacement of the equipment and components required for the
plant.
All the tools shall be supplied in separate containers clearly marked with the name of the
equipment for which they are intended.
E) Completeness
Any equipment, fittings, materials or supplies which may not be specifically mentioned in
the specification or drawings but which are necessary for smooth and normal operation of
the plant and equipment shall be provided by the Tenderer without any extra cost. The
plant must be complete in all respects and shall be in perfect running conditions to
comply with the guaranteed performance.
Before the start of the system/plant, the following conditions shall be fulfilled.
The plant and equipment shall be subjected to tests to prove satisfactory performance as
individual equipment and also as a system on the whole.
Plant and equipment erected shall conform to the approved process flow
diagram/schemes and drawings.
All machines shall be installed correctly as per manufacture’s instructions and drawings
or as directed at site by Purchaser/Purchaser’s authorized representative.
Detailed startup procedure shall be agreed upon between Purchaser / Consultant and the
Contractor before the tests.
j) Direction of rotation
Sl Data to be filled in
DESCRIPTION
No. by Tenderer
1. Application standard
2. Rated power supply
3. Voltage variation
4. Frequency variation
5. Combined variation
6. Ambient temp
7. Relative humidity
8. Rated kW
0
9. Derating factor for rating at 50 C over standard
0
continuous motor rating at 40 C
10. Method of starting
11. Max. permissible winding temp by resistance method
12. Starting current
13. Starting torque
14. Pull out torque
15. Motor overload and over speed capabilities
16. Motor frame size selection
17. Bearing
18. Degree of protection
19. Terminal box
20. Accessories
21. Application
22. Make
23. Quantity
24. RATED kW at 500C
25. Rated speed
26. Rated kW at 400C S1 duty (kW)
27. Motor Frame size selected
28. Full load current
29. Starting current
30. Motor no-load current
31. Ist /Ir
32. Tst/Tr
33. Mounting
34. Duty cycle
35. Overload capacity
36. Class of insulation
37. Max winding temperature by resistance method
38. Direction of rotation
39. Rated voltage & voltage/frequency variation
40. Operation at 80% rated voltage for 5 minutes
41. No. of starts/hr (equally spread) permissible
42. No. of cycles/hr (equally) spread permissible
43. Motor starting torque
44. Locked rotor torque
45. Pull up torque
46. Pull out torque
47. Degree of protection of motor enclosure
48. Degree of protection of terminal box enclosure
49. Motor type & ref. Standard
Sl Data to be filled in
DESCRIPTION
No. by Tenderer
50. Power factor at no load and full load
51. Efficiency at no load and full load
52. Design ambient temperature and relative humidity
53. Double compression Brass Cable glands (Qty & size )
as part of motor supply
54. Space heater
55. Double shaft extension
56. RTDs / BTDs
57. Weight of motor
58. Power terminals
59. Control terminals
60. No. / Cable (AYRY OR AYFY type) size considered
for termination
61. Stator resistance and inductance per phase
62. Size of Terminal box
63. Motor GA drg. for the frame selected (To be submitted
for each type of motor )
64. Motor speed torque characteristic (to be submitted for
each type of motor)
65. Motor performance characteristic curves (to be
submitted for each type of motor)
66. Shear motor overload data/other to be furnished
based on details given by
i) Direction of rotation
Data to be filled in by
S.No DESCRIPTION
Tenderer
1. Type
2. Make
3. Rated kW at 50 0 C s1 duty
4. Rated kW at 40 0 C S1 duty
5. Rated voltage & system condition
6. Frame size
7. Class of insulation
8. Rated speed & direction of rotation
9. Rated current
10. Starting current
11. Operation at 80% rated voltage for 5 minutes
12. Operation at 150% rated current for 2 minutes
13. No. of starts/hr (equaly spread) permissible,
from cold condition.
14. No of starts in quick succession.
a) From Cold Conditions
b) From Hot Conditions
15. Locked rotor withstand time at 110% rated voltage
16. Locked rotor torque
17. Pull up torque
18. Break down torque
2
19. Max. permissible GD of load
20. NEMA Classification for speed-torque characteristics
21. Max. winding temperature by resistance method
22. Type of construction
E. VERTICAL TURBINE PUMP SETS (To be furnished by the Tenderer separately for each
group of pumps)
Data to be filled in by
S.No DESCRIPTION
Tenderer
1 No. of pumps
2 Pump make & model no
3 Pump operating characteristics
i.) Rated capacity of each pump (m3/hr)
Data to be filled in by
S.No DESCRIPTION
Tenderer
xxix.) Recommended crane hook height, mm
xxx.) Maximum length of single piece of column pipe,
mm
xxxi.) Average velocity of water through column pipe,
m/sec
xxxii.) Type of lubrication
xxxiii.) Type of non-reverse ratchet and its details
xxxiv.) Size of suction bowl, mm
4 Type of end connection
• Discharge flange bore mm :
13 Drawings enclosed
a) GA drawing
b) Catalogue
c) Predicted performance curves
d) Speed vs torque curve for pump considering
open valve operation
e) Speed vs torque curve for motor
13 MATERIALS OF CONSTRUCTION
A Impeller
B Casing
C Casing ring
D Line shaft
E Shaft sleeve
F Gland
G Base frame
H Companion flanges
I Column pipe
J Suction strainer
K Impeller lock nut
L Wearing rings
M Impeller shaft
O Line shaft bearings
P Weight
a) Pump assembly, kg
b) Motor, kg
c) Total weight, kg
Q Noise limits, db at 1.6 m distance
Data to be filled in by
S.No DESCRIPTION
Tenderer
1 Make
0
2 Rated kW at 50 C
0
3 Rated kW at 40 C s1 duty (kW)
4 Rated voltage & system conditions
5 Frame size
6 Class of insulation
7 Rated speed & direction of rotation
8 Fl current
9 Operation at 75% rated voltage for 5 minutes
10 No. of starts/hr (equally :
spread) permissible
11 Locked rotor torque
12 Pull up torque
13 Pull out torque
14 Max winding temperature by resistance method
15 Degree of protection of enclosure
Configuration(Inline/Vee)
Cylinders
Removable
Wet or dry
Integral jacket
Crank shaft
Forged welded or cast
Heat treated
Conn rods
Forged
Heat treated
Rifle drilled
Articulated
Valves
No per cylinder
Removable seats
Lifters (hyd) (rollers)
Compression release
Pistons
No oil rings
No compr rings
Cooling method
Cam shaft
Diameter
Type of drive
Fly Wheel
Weight (Kg)
Diameter(mm)
Barring device (hand) (air)
Frame (cast) (fabricated)
Wrist pin (full float)
MATERIALS
Cylinder heads
Pistons
Crankshaft
Frame
Base
Main-shell
Crankpin
Cylinder liner
Connecting rings
Cam shaft
Valves
Lube oil, tank
Bearings
WEIGHTS & DIMENSIONS
Bare engine with flywheel
Dry/operating weight(Kg)
Length/width/height(mm)
Min distance between engines(mm)
Min height to remove pistons/rods(mm)
Oil cooler
Dry/operating weight (Kg)
Length/width/height(mm)
Max maintenance weights
Item Weight(Kg)
Item Weight(Kg)
Item Weight(Kg)
Item Weight(Kg)
SITE CONDITIONS
Altitude
Ambient temp 0C (Min/max)
Air humidity % (Min/max)
Back press (air cooler/radiator) (Kg/cm2)
Electrical supply
Motors (Hz)
Heaters/chargers ( Hz)
Location (In/Outdoor/Roof/Walls)
Fuel type(High Speed Diesel/Gas/Dual)
Winterisation required(Yes/No)
Fuel specification
GENERAL
Name of manufacturer
Manufacturer’s plant location
Tower model no.
Type of tower
Number of cells
Capacity per cell , m3/hr
TOWER OVERALL DIMENSION, m
a) Length
b) Width
c) Height ( to fan deck )
DIMENSION OF EACH CELL, m
♦ Length
♦ Width
♦ Filled height
♦ Louvre height and angle from
horizontal
BASIC PARAMETERS PER CELL
Rated water flow, m3/hr
Design wet bulb temp., 0C
Approach, 0C
0
Cooling range at rated flow , C
Evaporation loss at rated condition,
m3/hr/cell
Temp. of leaving air
♦ Dry bulb
♦ Wet bulb
2
Total air area, m /cell ( full plan area)
2
Total louvred area, m /cell
2
Dry air flow per m of air area, (G)
2
kg/h/m
2
Water flow area, m /cell
2
Water flow rate per m of water area, (L),
m3/h/m2
TOWER FILL
Material
Type of treatment
Expected life, years
Type of flow,
No. of full and partial decks
Equivalent fill decks
Equivalent fill height, m
Number, splash bars in direction of air
flow ( cross -flow)
Size, splash bars, mm ( nominal)
Splash bar position
Splash bar spacing
♦ Horizontal
♦ Vertical
Fill stringer size, m
Total fill volume, m3/cell
Wetted surface area, m2/m3
Splash surface area, m2/m3
Fill performance characteristics
Total vertical water fall height, m
Solidity ratio of fill, cross flow
FILL SUPPORT AND GRIDS
Type
Material
Size
GRID SUPPORT FRAME
Type
Material
Type of treatment, if any
FAN
Type and Make
No. of fans / cell
Diameter of fan, m
No. of blades per fan
Blade tip clearance, mm
Hub diameter, m
2
Net discharge area, m
Blade width at ¾ radius, m
3
Capacity, m /min per fan
Speed , rpm
Fan stack
♦ Height , m
♦ Type ( std or velocity recovery)
♦ Stack exit air velocity, m/sec
(based on NDA)
3
Air density at fan, kg/m
♦ Dry air
♦ Mixture
Fan pressure, mmWC
♦ Louvres
♦ Filling
♦ Eliminator
♦ Velocity head
♦ Total head
♦ Velocity recovery, if any
♦ Net head
Fan efficiency., %
♦ Static
♦ Overall
Brake power kW at motor shaft
Power at fan shaft, kW per shaft
Motor size, kW
Material of construction
♦ Blades
♦ Hub
♦ Fan shaft
Type of connection with gearbox shaft
REDUCING GEAR UNIT
Make
Type
Model No
Reduction ratio
Rated input, kW
Service factor at design point
Material of construction
♦ Gear
♦ Shaft
♦ Enclosure
“No load loss” at gear box
MATERIAL OF CONSTRUCTION
Structural member
Casing and louvres
Inner and outer casing
Fan stack
Distribution header
Hardware
MATERIAL HANDLING SERVICES
Type
Capacity
Material of construction
Protection against
corrosion
S. Data to be filled in by
Description Unit
No. Tenderer
1 General
1.1 No. of Plate heat exchangers Nos.
1.2 Manufacturer
1.3 Model No. / Type Plate type
1.4 Whether single or double pass Single
2 Design
2.1 Design Pressure Bar(g)
0
2.2 Design Temperature C
2.3 Heat Load Kcal/h
0
2.4 LMTD(Corrected) C
3 Guaranteed performance for each Primary Secondary
heat exchanger Side(Soft side(Industria
Water) l water)
3
3.1 Flow rate m /h
0
3.2 Inlet Temperature C
0
3.3 Outlet temperature C
a) In fouled conditions
b) In clean conditions
3.4 Total Pressure drop across heat Bar(g)
exchanger from inlet to outlet
S. Data to be filled in by
Description Unit
No. Tenderer
2 0
4.2 Fouling factor m /hr C
/ Kcal
4.3 Overall fouling m2/hr 0C
/ Kcal
4.4 Overall heat transfer coefficient Kcal /
2
hr/m /
0
C
a) In fouled conditions
b) In clean conditions
2
4.5 Total Effective heat transfer area per m
heat exchanger
4.6 Average velocity m/s
a) Through ports
b)Through plate channels
4.7 Pressure drop in ports Bar(g)
a) In clean conditions
b) In fouled conditions
4.8 Pressure drop in channels Bar(g)
a) In clean conditions
b) In fouled conditions
4.9 Maximum differential pressure Bar(g)
between hot and cold fluids in plate
channels(Operating)
5 Heat transfer Plates
2
5.1 Area of each plate m
5.2 Dimension(Width x height) mm x
mm
5.3 Thickness mm
5.4 Material and chemical composition AISI 316
S. Data to be filled in by
Description Unit
No. Tenderer
5.12 Port Size(Diameter) mm
6 Plate Gaskets
6.1 Type Glued
6.2 Material and chemical composition Nitrile Rubber
7.3 Size
7.4 Material CS IS:2062 with SS
Cladding
8 Guide bar
8.1 Type of construction Stdd. I section beam
8.2 Number per heat exchanger Nos
8.3 Size
8.4 Material CS IS 2062
9 Frame plate
9.1 Type of construction Fabricated - profile cut
9.2 Material CS IS:2062
10 Pressure plate
10.1 Type of construction Fabricated - profile cut
10.2 Material CS IS:2062
11 Supporting columns
11.1 Type of construction Std I section beam
11.2 Material CS IS:2062 GR B
12 Clamping / Gasket compression
arrangement
12.1 Type of arrangement Tie rod type
12.2 Bolt size and material ASTM 193 B7
12.3 Nuts size and material ASTM 194 2H
13 Inlet and outlet nozzles Primary Secondary
Side(Hot side(Cold
fluid) Fluid
13.1 Size mm
13.2 Rating 150 Class 150 Class
13.3 Facing and drilling standard Weld neck ANSI B
RF 16.5
13.4 Flange material ASTM 105
13.5 Are all nozzles counter flanges, Yes(Studded end
bolts, nuts and gaskets etc. included connections)
in the offer
S. Data to be filled in by
Description Unit
No. Tenderer
14 Cleaning frequency of the heat months
exchanger for assumed fouling
factor
15 Is backwash necessary NO
16 Are all auxiliaries and accessories YES / NO
included in the offer
20.1 Location
20.2 Type and size
20.3 End details
20.4 Materials
a) Body
b) Trim
20.5 Pressure rating
20.6 Number per heat exchanger Nos
20.7 Manufacturer
21 Are all counter flanges, bolts, nuts Yes(Studded end
and gaskets etc. for all terminal connections)
points included in the offer
S. Data to be filled in by
Description Unit
No. Tenderer
22 Are all heat exchangers supplied Yes
with necessary foundation plates,
anchor, bolts, sleeves, inserts, lifting
lugs etc., as specified
23 Shot tests & Inspection
23.1 Whether all tests and inspections as All standard tests will be
detailed in specification / quality plan carried out
will be carried out
23.2 Hydrostatic test
a) Test Pressure bar(g) 15
b) Test duration min. 20
23.3 Are all plates checked for cracks and 10 % Dye penetrant test
other defects by penetration
method? If not, what percentage is
checked
23.4 whether hardness test will be Test reports of sub vendors
conducted for plate gaskets will be provided
24 Details of painting
24.1 Exterior surface YES
a) Surface preparation
b) Primer
c) Finish Preparation
24.2 Interior surface
a) Surface preparation
b) Primer
c) Finish Preparation
25 Weight of each heat exchanger Kg
a) Empty
b) Flooded
26 Overall Dimensions
Length x breadth x height mm x
mm x
mm
27 Withdrawal space min. 1 m from all sides
28 Other information (If any)
B Base Exchangers
C Blowers
B Cation Exchanger
C Anion Exchanger
E Degasser Tower
F Storage tanks
G Measuring Tanks
I Blowers
J Pumpsets
Pumpsets (Contd….)
K Regeneration Flow
1. Required nos.
A. Simplex Filter
B. Duplex Strainer
with SS strips.
11. Ratio of free flow area to 8:1
nozzle area
2
12. Pressure loss (kg/cm ) at a) Clean condition -
maximum flow 2
Not more than 0.1 kg/cm .
b) 50% clogged condition -
2
Not more than 0.5 kg/cm .
13. Differential Pressure Gauge 1 no. per strainer
14. Drain with valves 2 Nos. per strainer, size – 25 NB
(Plug type valves)
15. Vent with valves 2 nos. per strainer of size 15 mm dia.
16. Pressure equalising 1 no. per strainer , size – 25 NB
arrangement with plug type
valve
17. Materials of construction
(main components)
Body Carbon Steel as per IS 2062 : 1992 Grade B
Strainer element (including SS 304
handle) & wire Mesh.
Inspection hole covers, Carbon Steel as per IS 2062 : 1992 Grade B
Drain covers, Top & bottom
covers.
Spindles EN 8
Valve disc IS:210-1978 (reaffirmed in 1990) FG 300/or M.S.
Valve seating IS:318-1981 (reaffirmed in 1991) LTB-2 Gr.2
Gaskets sealing rings CAF
Companion flanges at inlet IS:6392/1971, Table-17 (RA88)
and outlet
C Y - Strainer
Material Of Construction
• Nos. offered :
• Design flow rate :
• Detention time :
• Size of flash mixing tank :
• Material of construction of tank :
• Type and details of mixer mechanism :
• Material of construction of mixer :
• Ratio of impeller diameter
to tank diameter :
• Rotational speed of impeller :
• Velocity gradient :
• Details of drive :
• Rated kW of motor :
• Motor rpm :
• Nos. offered :
• Chemical to be handled :
• Nominal capacity :
• Dimensions of tank :
• Material of construction & thickness :
• Interior surface protection :
• Mixer/Stirrer Mechanism
i) Number :
ii) Manufacturer :
iii)Speed (rpm) :
• Material of construction of
i) Propeller/agitator :
ii) Shaft :
iii)Fixing bracket :
• Drive details :
• Rated kW of drive :
Note : Separate data sheet shall be furnished for each type of the above tanks.
• Nos. offered :
• Type, make :
• Capacity (lph) :
• Discharge head :
• Material of construction of
i) Casing :
ii)Impeller :
• Drive details :
• RPM :
• Rated kW of motor :
(Note : Separate data sheets shall be furnished for each type of the above pumps)
• Type :
• Nos. offered :
• Design flow rate
i) Normal (m3/h) :
3
ii) Maximum (m /h) :
iii)Back wash :
iv) Rinse :
• Quality of influent water :
i) Total suspended solids (ppm) :
ii) pH :
• Guaranteed effluent quality
i) Total suspended solids (ppm) :
ii) Micron size :
iii)pH :
3 2
• Filtration rate (m /h /h) :
• Vessel dimensions
i) Shell diameter (mm) :
ii) Straight length (mm) :
iii)Overall length (mm) :
• Plate specification and thickness
i) Shell :
ii) Dished end :
• Vessel design code :
• Design pressure (Kg/cm2) :
• Test pressure (Kg/cm2) :
• Filtration area :
• Filter media
i) Type :
ii) Effective size (mm) :
3
iii)Volume per filter(m ) :
iv) Life of filtering media :
• Media depth (mm) :
• Free board (mm) :
• Type & MOC of inlet distributor :
• Type & MOC of under drain collection system :
• Back-wash cycle period :
• Guaranteed output between
3
two successive backwash (m ) :
• Duration of air scour (minutes) :
• Specific consumption of scour
3 2
air (m /h /h) :
• Pressure of backwash water (mWC) :
• No. of blowers :
• Type & make :
• Capacity (m3/h) :
• Total pressure (mmwg) :
• Speed (rpm) :
• Efficiency :
• Drive details :
• Material of construction
a) Impeller :
b) Casing :
c) Shaft :
d) Gears :
e) Suction filter :
f) Silencer (suction/discharge
side) :
• Nos. offered :
• Type and make :
• Design considerations
i) Slurry viscosity (CP) :
ii) Max. solid size (mm) :
iii)Max. dry solids sp. gravity :
iv) Max. liquor sp. gravity :
v) Max. solids content (by weight) :
• No. of propellers :
• Propeller diameter :
• No. of blades :
• Tip speed
• Power (kW) at tip speed :
• Weight (kg) :
• Details of agitator features :
• Details of drive system :
• Material of construction for
i) Propeller blades :
ii) Propeller shaft :
iii)Gear box housing :
iv) Output shaft :
v) Bearing (upper/lower) :
vi) Bearing housing :
CONSTRUCTION FEATURES
MATERIAL OF CONSTRUCTION
• Main frame :
• Filter plates :
• Filter cloth :
• Operation :
• Distributor (opening/closing) :
• Relief valves :
• Lower pressure pump :
• Flow rate / pressure (max) :
• High pressure pump :
• Flow rate / pressure (max) :
• Pump assembly :
• Assembly position :
• Electric motor :
• installed power :
• RPM :
• Power supply voltage (service tension)
• Protection :
• Oil tank :
• No of pressure transmitter :
• Connections to piston :
PUMP
HP DIRECT COOLING
S1. No. Item No.
PUMPS
2 Type
3 Service(working medium)
4 Quantity(no.
5 Capcaity m3/h
6 Discharge head mWc
7 Drive (Direct / belt driven)
8 Motor Speed
9 Pump speed
10 Weight of pumpset kg
pump
Motor
Base Frame
o
11 Working temperature C
o
12 Ambient temperature considered C
13 Accessories
Companion flanges, bolts, nuts & Gaskets
18 Make:
Pump
Motor
Coupling
bearings
19 Test pressure & Duration
20 Conforming standard / code for tests to be
conducted
1. No of assemblies
2. Name of foreign collaborator (if any)
3. a) Distance between rails
b) Size of rails
4. Dimension of equipment
5. Bridge drive
a) type of motor
b) K.W
c) Motor speed
d) Output RPM
e) Class of Insulation/degree of protection
6. Hoist drive
a) Type of motor
b) kW
c) Motor speed
d) Output RPM
e) Class of Insulation/degree of protection
7. Scrapper speed
8. Skim speed
9. Type of Brakes
10. Type and make of gear boxes
11. Power Transmission arrangement.
12. a) Make of control panel
b) Degree of protection
c) Type of panel
d) Location of panel
13. Over load protection system
14. Materials of construction of various components
15. G.A drawings and cross section enclosed or not
16. Write-up on control scheme enclosed or not
17. List of drawings proposed to be submitted for
approval enclosed or not
18. Quality assurance plan as submitted in prescribed
Performa or not
19. a) time bar chart submitted or not
b) Delivery period
20. List of 2 year’s spares and commissioning spares
submitted or not.
A.C MOTORS
1. Make
2. Type
0
3. kW , at 40 deg. And at 55 C and R.P.M
4. Voltage
5. Frequency
6. Frame size
7. Duty
8. Class of Insulation
9. Enclosure Class
D.O.L STARTERS
1. Make
2. Enclosure Class
3. Make of components
4. Sheet Steel thickness
5. Compliance with T.S
LIMIT SWITCHES
1. Type
2. Make
3. Enclosure Class
4. No. of N.O + N.C Contacts
CABLES
Power Cables/Control cables/Festoon Cables
1. Make
2. Conformity with T.S
(combined variation
10%) 50 kA fault level
6. Frame size
7. Class of insulation
8. Rated speed & direction of rotation
9. Rated current
10. Starting current
11. Operation at 80% rated voltage for 5 minutes Suitable/ not suitable
12. Operation at 150% rated current for 2 minutes Suitable/ not suitable
13. No. of starts/hr (equally spread) permissible, from
cold condition
14. No. of starts in quick succession
c) from cold condition
d) from hot condition
15. Located rotor withstand time at 110% rated voltage
16. Located rotor torque
17. Pull up torque
18. Break down torque
19 Max. permissible GD2 of load
20. NEMA Classification for speed-torque
characteristics
21. Max. winding temperature by resistance method
22. Type of construction
23. Whether casing feet is integral with the frame
24. Degree of protection of enclosure
25. Material of stator frame
26. Number and size of aluminum cables that can be
terminated
27. Earthing sound provided inside terminal box
28. Detail of thermal protection
- passivation
- regular operation
Dosage frequency Continuous / Once in 15 days
Dosing point Cold sump / Hot sump / CT Basin /
Suction
Total chemical consumption for
Precleaning Kg
Passivation Kg
Regular dosage Kg
Dosing method By metering Pumps / Manual Pouring
Metering Pumps
No.
Make
Model
Capacity
Power requirement
Capacity adjustment
Carbuoy / Drum
Capacity lit.
Total weight Kg
Size
CONSTRUCTION FEATURES
• Cake thickness :
• Design service pressure :
• Feed inlet pipe size :
• Filter outlet :
• Plate movement : cam
• Drive for movement : hydraulic motor
• Filter cloth size :
• Filter plate type :
• Plate thickness :
• Cake removal method :
• Total installed power :
MATERIAL OF CONSTRUCTION
• Main frame :
• Filter plates :
• Filter cloth :
• Operation :
• Distributor (opening/closing) :
• Relief valves :
• Lower pressure pump :
• Flow rate / pressure (max) :
• High pressure pump :
• Flow rate / pressure (max) :
• Pump assembly :
• Assembly position :
• Electric motor :
• installed power :
• RPM :
• Power supply voltage (service tension)
• Protection :
• Oil tank :
• No of pressure transmitter :
• Connections to piston :
PUMP
HP DIRECT COOLING
Sl. No. Item No.
PUMPS
2 Type
3 Service(working medium)
4 Quantity(no.
5 Capacity m3/h
6 Discharge head mWc
7 Drive (Direct / belt driven)
8 Motor Speed
9 Pump speed
10 Weight of pumpset kg
pump
Motor
Base Frame
11 Working temperature oC
12 Ambient temperature considered oC
13 Accessories
Companion flanges, bolts, nuts & Gaskets
HP DIRECT COOLING
Sl. No. Item No.
PUMPS
17 Pumps rotating parts are both statically &
dynamically balanced
18 Make:
Pump
Motor
Coupling
bearings
19 Test pressure & Duration
20 Conforming standard / code for tests to be
conducted
1. Type of valve
2. Constructional length, flange to flange with
tolerances.
3. Height of hand wheel from centre line of valve
4. Fixing of seat rings to body and gate.
5. Hand wheel diameter
6. Force required on hand wheel/ chain for opening
and closing of valves.
7. Number of hand wheel revolutions for full opening.
8. Height of lift per revolution.
9. Spindle diameter
10. Type of spindle threads
11. No. of starts of spindle thread
12. Weight of each valve
13) Pressure drop
MATERIAL OF CONSTRUCTION
1. Body
2. Bonnet
3. Yoke
4. Wedge/Disc
5. Spindle
6. Seat ring
7 Yoke Sleeve
8 Hand Wheel/Chain wheel
9 Gland Bush
10 Gland Packing
11 Gland Flange
12 Body Bonnet Gasket
13 Bonnet Bush
14 Bonnet Stud
15 Bonnet Stud Nut
16 Hand Wheel Nut
17 Lifting Lugs
18 Companion Flanges
19 Gasket for Companion Flanges
20 Fasteners for Companion Flanges
21 Type of Wedge for Gate Valve
B. NON-RETURN VALVE
1. Body
2. Cover
3. Hinge
4. Hinge Pin
5. Hinge Pin Spacer
6. Disc
7. Seat ring
8. Disc Nut
9. Disc Washer
10. Cotter Pin
11. Cover Stud
12. Cover Stud Nut
13. Gasket for Cover
14. Companion Flanges
15. Gasket for Companion Flanges
16. Fasteners for Companion Flanges
Testing
a. Brief description
b. Allowable leak rates for pneumatic & hydraulic tests.
GENERAL SPECIFICATION
FOR
ELECTRICAL SYSTEM
(GS – 03)
MECON LIMITED
RANCHI - 834002
No. MEC/S/1901/11/38/0/00/00/F1889/R2 JULY, 2007
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CONTENTS
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35.0 1.01.16 Spares Philosophy 21
36.0 1.01.17 Uninterrupted Power Supply (UPS) 21
37.0 1.01.18 Colour coding of equipment 22
38.0 1.01.19 Drawings and documents 22
39.0 1.02 EQUIPMENTS 23
40.0 1.02.01 TRANSFORMER 23
41.0 1.02.02 VCB (Transformer Isolation) 32
42.0 1.02.03 415V Switchgear 36
43.0 1.02.04 LT busduct 45
44.0 1.02.05 Power Distribution Board (PDB) 48
45.0 1.02.06 Motors & Field devices 49
46.0 1.02.06.01 Low voltage squirrel cage induction motors 49
47.0 1.02.06.02 Low voltage slip ring induction motors 51
48.0 1.02.06.03 Roller Table Motors (Torque motors) 54
49.0 1.02.06.04 High voltage squirrel cage induction motors 54
50.0 1.02.06.05 Synchronous Motors 57
51.0 1.02.06.06 LT Inverter Duty Motor 59
52.0 1.02.06.07 DC Electromagnetic brake 63
53.0 1.02.06.08 Field Switches 64
54.0 1.02.06.09 Power Resistance 64
55.0 1.02.07 Individual Drive Control Level 65
56.0 1.02.07.01 Variable Frequency Drive (VFD) 65
57.0 1.02.07.02 AC Line Reactor 73
58.0 1.02.07.03 Load Commutated Inverter (LCI) 73
59.0 1.02.08 Intelligent type MCC 75
60.0 1.02.09 Stand Alone Starter 83
61.0 1.02.10 Soft Starter 86
62.0 1.02.11 Specifications of major components 91
63.0 1.02.11.01 Moulded Case Circuit Breaker (MCCB) 91
64.0 1.02.11.02 AC Contactors 92
65.0 1.02.11.03 Current transformers 93
66.0 1.02.11.04 Control transformers 93
67.0 1.02.11.05 Indicating instruments 93
68.0 1.02.11.06 Thermal Overload Relays 94
69.0 1.02.11.07 Magnetic Overload Relays 94
70.0 1.02.11.08 Push Buttons 95
71.0 1.02.11.09 Indicating Lamps 95
72.0 1.02.11.10 Miniature Circuit Breakers (MCB) 96
73.0 1.02.11.11 Selector Switches 97
74.0 1.02.12 Local Control Stations 97
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75.0 1.02.13 Control Desk 98
76.0 1.02.14. Control System Concept And Philpsophy 100
77.0 1.02.15. Automation System 101
78.0 1.02.15.01 General 101
79.0 1.02.15.02 Programmable Logic Controller (PLC) 111
80.0 1.02.15.03 Human Machine Interface (HMI), Work Station & 120
Engineering Station
81.0 1.02.15.04 Server 122
82.0 1.02.15.05 Software 123
83.0 1.02.16 Large Screen Display System 126
84.0 1.02.17. Uninterrupted Power Supply 127
85.0 1.02.18 Electronic Weighing System 135
86.0 1.02.19 CABLES 141
87.0 1.02.19.1 HT Cables 141
88.0 1.02.19.1.i 33 kV kV(UE) XLPE cables 141
89.0 1.02.19.1.ii 6.6 / 11 kV (UE) XLPE cables 142
90.0 1.02.19.2 LT CABLES 143
91.0 1.02.19.2.i 1.1 kV Power Cable 143
92.0 1.02.19.2.ii 1.1 KV Grade Control Cable 144
93.0 1.02.19.2.iii 1.1 KV Grade Screened /Special Cable 145
94.0 1.02.19.2.iv Heat resistant cable 147
95.0 1.02.19.2.v Trailing cable 147
96.0 1.02.19.2.vi Flame Retardant Low Smoke (FRLS) Cables 148
97.0 01.02.20 EOT Cranes 148
Trolley lines and power supply arrangements for
cranes
98.0 1.02.21 Erection Specification 164
99.0 1.02.21.01 Guidelines for design of system and engineering the 164
layout of electrical equipment.
100.0 1.02.21.01.01 General 164
101.0 1.02.21.01.02 Electrical premises 164
102.0 1.02.21.01.03 Control rooms/pulpits 165
103.0 1.02.21.01.04 Cable tunnels 165
104.0 1.02.21.01.05 Cable shafts 166
105.0 1.02.21.01.06 Clearances inside the electrical rooms 166
106.0 1.02.21.01.07 Transformer rooms 167
107.0 1.02.21.02 Guide-line for erection of Electrical equipment 167
and accessories
108.0 1.02.21.02.01 General 167
109.0 1.02.21.02.02 Rotating machines 168
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110.0 1.02.21.02.03 Sheet metal enclosed panels, open control panels, 169
control desks and boxes
111.0 1.02.21.02.04 Static converters 170
112.0 1.02.21.02.05 Transformers and reactors 170
113.0 1.02.21.02.06 Battery installation 171
114.0 1.02.21.02.07 Busbar 171
115.0 1.02.21.02.08 Crane Trolley Lines 171
116.0 1.02.21.02.09 Resistance Box 171
117.0 1.02.21.02.10 Cables Installations 172
118.0 1.02.21.02.11.1 Laying in tunnels/surface ducts/on structures 172
119.0 1.02.21.02.11.2 Structures for cable laying 173
120.0 1.02.21.02.11.2 Cable Joint/termination accessories 176
121.0 1.02.21.02.12 Exposed conduits 177
122.0 1.02.22 Earthing and lightning protection 177
123.0 1.02.22.01 Earthing 179
124.0 1.02.22.02 Conductor sizes for ground connections 179
125.0 1.02.22.03 Earthing electrodes 179
126.0 1.02.22.04 Lightning protection 180
127.0 1.02.23 Repair network 181
128.0 1.02.23.01 General 181
129.0 1.02.23.02 Switch socket outlets 181
130.0 1.02.23.03 Cables 181
131.0 1.02.24 Ventilation and Air-Conditioning of Electrical 182
Premises/Control Rooms
132.0 1.02.24.01 General 182
133.0 1.02.24.02 Switchgear rooms, MCC rooms, Cable cellar 182
134.0 1.02.24.03 Electrical rooms with electronic equipment 182
135.0 1.02.24.04 Central Control rooms, Rooms for PLC, Servers, 183
Computers and Level-1/2 automation system
equipment.
136.0 1.02.24.05 Small local Control Rooms/pulpits 183
137.0 1.02.24.06 Cable tunnels and basements 183
138.0 1.02.25 Testing 183
139.0 1.02.25.01 Type & Routine 184
140.0 1.02.25.01.01 Transformers 184
141.0 1.02.25.01.02 Busduct 184
142.0 1.02.25.01.03 Power Control Centre and LT switchgear 185
143.0 1.02.25.01.04 Load Break Isolator 185
144.0 1.02.25.01.05 Current Transformer and voltage transformer 185
145.0 1.02.25.01.06 Final Test of Materials of Grounding and lightning 186
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system
146.0 1.02.25.01.07 Cables 186
147.0 1.02.25.01.08 Motors 187
148.0 1.02.25.01.09 Site tests and checks 188
149.0 1.02.25.01.09.01 General 188
150.0 1.02.25.01.09.02 Trial Run Test 188
151.0 1.02.25.01.09.03 Acceptance test 188
152.0 1.02.25.01.09.04 Site Tests 188
153.0 Appendix – 192
Selection of Power Components & Wiring for
Continuous Duty Cage Motor Drives
154.0 1.02.26 Illumination 193
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10.0 ELECTRICAL
1.01 General
1.01.01 Standards
In case, the tenderer is not in a position to comply fully with certain IS / IPSS
specifications or in respect of certain items for which there are no IS / IPSS
specifications, the tenderer may base his proposals on IEC recommendations or other
reputed national or international standards subject to the approval of the Purchaser.
The components and materials used and the equipment supplied shall conform to high
standards of design, engineering and workmanship and shall be suitable for efficient
operation and reliable service in steel plant conditions .
All equipments supplied and all work done including system design and detailed
engineering shall also comply with the statutory requirements of Govt. of India and the
respective governments of state in which the plant is situated . The installation shall
also confirm to Indian Electricity Act and Indian Electricity Rules.
In case of any contradiction between the data given in the Technical Specification (TS)
and this General Technical specification (GTS), data given in the Technical
specification (TS) shall prevail.
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Sl.No Environmental condition Data
4.0 Environment Dusty & Corrosive
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The equipment offered should be suitable for smooth, efficient and trouble free service
in the tropical humid climate prevailing at plant site and under the ambient temperature
conditions indicated above for the different shops and areas. In hot areas of higher
temperature conditions, the equipment shall be adequately protected against damage
from radiant heat and hot air.
The equipment shall be designed to give efficient and reliable performance under
heavy steel plant conditions and shall be such that the risks of accidental short-circuits
due to animals, birds or vermins are avoided.
In case the standard voltage levels to be adopted in the plant are specified in the
Technical specification, it shall be followed. In absence of any details indicated in the
Technical Specification, the following standard voltage levels shall be adopted.
Sl.No Description Data
1 HT AC 11 KV / 6.6 KV , 3 phase, 50 Hz,
unearthed neutral .
2. LT AC 415V, 3 Phase, 50 Hz, 4 wire, solidly
earthed
3. AC control and signaling 240V, AC + 10% obtained using suitable
voltage control transformers with auto
changeover facility.
4. DC supply voltage 220 Volts / 110 Volts
5. DC control and signaling 220 Volts / 110 Volts
voltage
6. Control voltage for HT 110 V DC from battery in HT S/S area.
switchgear equipment 220 V DC from battery in MSDS area.
7. Special socket outlets for 24V, single phase, 50 Hz, AC obtained
portable lamps through suitable transformers
8. DC Electro-magnetic brakes 220V, DC, obtained through individual
rectifiers
9. Solenoid valves 24V DC, unearthed
10. Machine tools lighting 24 V AC
11. Sockets for Welding purposes 415V, 100A, 3 pin plus earth with plug
interlocked switch
12. Sockets for hand tools 240V, 15A, 2 pin plus earth with plug
interlocked switch
13. Illumination system 240 V AC for general application.
24 V AC for confined & semi confined
area. (as per IPSS).
14. PLC power supply 240 V AC, 50 Hz, obtained through UPS
(for processor , RIO chassis ,
© #
Sl.No Description Data
interrogation voltage and output voltage )
240 V AC , single phase from MCC (for
aux. voltage )
15. Monitoring and signaling in 24V, DC
electronic installations, mimic (Through PLC output for PLC control
panels boards / desks)
16.
PLC DI interrogation voltage 24 V DC
17.
PLC DO voltage 24 V DC
The three phase symmetrical short-circuit ratings of the switchgear at the different
voltage levels shall be as follows unless specifically indicated in the Technical
specification:
The system / unit / plant / equipment shall be designed so as to be suitable for the
following variations in voltage and frequency unless specifically indicated in the
Technical specification:
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Description Voltage Frequency
with rated performance
and control quality
maintained
Permissible voltage dip at For LT system :- Frequency Variation for both
the HT and LT switch -15% HT & LT shall be
gear bus during starting of For HT system :- considered as +4%, -6%.
HT and LT motor - 10%
1.01.04 Criteria for selection of voltage levels for motors & Power devices:
• AC squirrel cage induction motors of ratings up to 200 kW and slip ring motors up
to 250 kW shall be fed at LT, 415V, 3 phase , 4 wire , 50 Hz with DOL.
• AC motors of ratings in excess of 200KW upto 1000 KW and beyond 1000 KW
shall be connected to 6.6 KV U/E and 11 KV U/E power supply system
respectively for DOL starting. The HT voltage level shall be as specified in the
Technical specification.
• AC squirrel cage induction motors of ratings up to 200kW may be fed at LT, 415V,
3 phase 4 wire 50 Hz, with VFD where speed control is required.
• For motor rating more than 200 KW up to 1000 KW shall be provided with VFD
where speed control is required , the rated voltage of the motor shall be 690 V .
• Soft starters with DOL bypass shall be provided for drives ratings ranging from 90
KW to 200 KW where full torque load starting and speed variation is not required
The power distribution system shall meet the following guide lines:
Suitable numbers of 415V LT Substation (LTSS) shall be provided for feeding
different Motor control centers and auxiliaries power distribution boards as required
for the plant.
The MCC / PDB / MLDB shall be fed from LTSS.
Suitable numbers of 415V Motor control centers shall be provided for feeding
power supply to motors of rating 90 KW and below.
Field located Power supply panels (MCB DB / Local Starter Panels) shall be fed
from MCC.
Electronic relays with display (for motor rating of 37 KW and above) shall be
considered in place of thermal overload relays as follows :
o Electronic over load relay protection for motors below 15 KW for crane
application and for reversible drives. Electronic over load relay / MPCB
protection for motors below 15 KW for other application
o EOCR for OC & EF , unbalance protection for motors rated 18.5 KW to 90 KW
o Composite motor protection relay with OL , OC ,EF , unbalanced & locked
rotor protection with digital display for motor rated 110 KW and above .
o EOCR shall be used only for non intelligent feeders .
Motor of rating above 90 kW shall be provided with independent Motor control
Panel (MCP) which shall be fed directly from LTSS. Power devices like MCCB,
©
Contactors, intelligent motor control relays / microprocessor based MPR (for non
intelligent controllers) etc. shall be located in independent MCPs. Each MCP shall
be located in MCC room by the side of the respective group MCC.
VFD’s shall be provided for process fans / pumps as per technological requirement
A dedicated MCC with two incomers (one from PCC and other from DG set or any
emergency power source) and bus coupler shall be provided for catering to all
emergency loads of the shop/unit.
MCCB, contactor and overload relay rating for the low voltage general purpose
induction motors shall be selected as per type-2 coordination chart of selected
manufacturer. However the minimum contactor rating shall be 32A.
All the important drives (all 6.6 KV , 11 KV & 690 V motors) should be provided
with suitable CBM systems such as vibration monitoring, current signature,
temperature etc. Information from CBM systems to be interfaced to HMI system as
well as plant-wide CBM system.
1.01.05.02 The capacities of the transformer shall be selected as per the following guidelines:
MD of MCC, shall be calculated as per the guidelines given in clause no. 1.01.08 of
the General Technical Specifications.
Load factor of 0.9 shall be considered for motors being fed from 415V LTSS . The
load factor shall be applied on the kW rating of motors. Only working motors shall
be considered.
Load of lighting transformer shall be considered as per the kVA rating of
transformer.
Where ACDB is provided along with the LTSS, then load of ventilation system with
0.9 load factor shall be considered.
Diversity factor of 1.1 shall be used on the summation of MDs of various MCCs,
motors, lighting transformers and ACDB.
Spare capacity of 20% shall be provided for future use.
Each LTSS shall be fed from two identically rated transformers.
In case of outage of any transformer, the remaining transformer shall be loaded up
to 80% of their rating.
Transformer shall be selected from standard rating of 1000/2000 KVA only
It shall be ensured that when all the loads are in operation and the largest motor is
started, the voltage drop at the motor terminals shall not be more than 15%.
1.01.05.03 The rating of outgoing feeders of LTSS shall be selected from standard circuit breakers
ratings of 800A, 1000A & 1600 A only considering the load requirement and derating
factors due to ambient temperature as well as for the mounting of the component in the
switch board. CTs shall be selected considering the actual loads.
1.01.05.04 11kV / 6.6 kV panel mounted load break switches with earthing switches of adequate
rating shall be provided before feeding the transformer . Transformer pens shall also
be provided with push button station for switching ON/OFF the corresponding 11kV /
6.6 kV upstream feeding circuit breaker.
In case of transformer of rating 5 MVA and above , following arrangement shall be
followed:
• LBS (isolator) shall be provided in the transformer room, when transformer is fed
from remote HT switchboard.
• Lockable type PB shall be provided in transformer room when transformer is fed
from HT switchboard located in the same building.
©
1.01.05.05 AC squirrel cage induction motors shall be used for drives requiring speed control.
For all electrical machines wherever strip wound coils are used detail drawing is to be
provided in soft copy.
Use of DC motors, AC slip ring motors shall be avoided to the extent possible.
Manufacturing drawing for parts – stator coils, slip ring, brush, brush holder in slipring
motor’s and drawings of parts of– armature coil, commutator, brush and brush holder
in DC machine shall be provided in soft copy.
Sizes of conductors used in motors shall be preferred sizes as per IS.
Sufficient spares of parts of all electrical machines shall be provided..
1.01.06 Cabling
Tenderer shall note the following regarding cabling:-
Sl. No. Requirement Remarks
1.0 Inter shop cable routing Through overhead cable gallaries /
structure or walkable cable tunnel.
2.0 Substation building RCC cable basement of minimum 3.0
metres clear height .
3.0 MCC room RCC cable trench / false floor at
bottom of MCC
4.0 Illumination system cable laying in 1. Unarmoured FRLS cables through
all units. MS black conduits in open area.
2. Armoured FRLS without conduit in
covered area.
3. Unarmoured FRLS cables through
concealed MS black conduits in
buildings like control room, office
building etc.
Voltage drop at the terminal of other equipment shall be as per the minimum voltage
required for proper functioning of the equipment recommended by their manufacturers.
©
1.01.08 Maximum Demand of MCC
Maximum demand (MD) of the MCC shall be calculated considering the following:
1. Working load of the MCC shall be calculated based on the motor kW rating.
2. The load factor shall be considered as follows:
1. All ACB I/C shall be intelligent type having standard protocol for
communication
2. Incomer of the MCC shall be ACB / MCCB having fault level of 50 kA for 1 sec.
MCCB shall be provided for ratings 630A and below. Standard ratings of ACB /
MCCB shall be provided.
3. Continuous current rating of the incomer shall be corresponding to MD of the
MCC.
4. In case of PMCC where MCC is directly fed from transformer, Continuous
current rating of Incomer shall be equal to current rating of transformer.
5. In case ACB / MCCB is rated for 40 deg.C then continuous de-rated current in
enclosure and for ambient temperature shall be more than MD / transformer
current rating.
6. Main bus bar rating of MCC shall be equal to incomer rating.
7. Voltage rating of the breaker shall be equal to the incomer voltage of the
system with rated tolerance (as mentioned in the relevant chapter).
8. Each MCC shall be provided with manual operated, draw out two nos.of
incomers and one no. of bus coupler . Incomers and bus coupler shall be ACB
/ MCCB. ACB / MCCB shall be provided with overload, short circuit, earth fault
and under voltage releases.
9. Each incomer and bus coupler shall be provided with indicating lamps for each
phase for incoming supply and digital ammeter and voltmeter for measuring
current in each phase and line to line voltages of MCC bus. ON, OFF and
TRIP indicating lamps shall also be provided.
10. Incomer and bus coupler shall be mechanically interlocked in such a way that
at any given time only two breakers can be closed. Electrical interlocks shall be
provided as follows:
©
When both incomer ACBs / MCCBs are ON then bus coupler ACB / MCCB
can not be switched ON.
When incoming power to one of the incomer is not available then bus
coupler can be switched ON manually.
When incoming power to the incomer breaker is restored then incomer can
be switched on manually and bus coupler will trip automatically.
Bus coupler closing is not permitted if the incomer trips on fault.
1.01.10 Outgoing Feeder Selection for MCC
In case power factor correction at LT level is specified in specification then APFC shall
be provided in PMCC / LTPDB. The capacitor bank shall be so designed that the
overall power factor of the system shall be 0.95.
©
IS:1554. In case copper conductor cables are used then the maximum & minimum
size of cable shall be one size lower than as indicated above for aluminium cables.
For motors rated up to 2.2 kW and actuators of motors of valves and dampers
cable size of 4x2.5sq.mm. of type YRY as per IS:1554 shall be used.
For calculating the current rating of power cables de-rating factor of 0.65 shall be
used.
.05 General
Minimum size of the cables used in LT power circuits shall be 6sq.mm per core if
with aluminium conductor or 4sq.mm per core if with copper conductor. Maximum
cable size shall be 240sq.mm for incomers to MCCs, PCCs etc. The minimum
cable size selected for applications in the power circuits of cranes and other
moving mechanisms shall be 6sq.mm per core copper. All power cables shall be
3.5 / 4 cores.
For power supply to moving mechanisms subject to vibrations, flexible copper
cables preferably of single core should be used. In these cases, a separate core
should be provided for earthing. For hoists with flexible / festoon cable system,
power supply shall be through butyl rubber / EPR insulated PCP/CSP sheathed
flexible cables. Cables used for circuits of tacho generators, brakes, solenoids,
field windings and secondary windings of measuring transformers shall be copper
conductor with cross-sectional area not less than 2.5sq.mm per core.
For control circuits, PVC insulated and PVC sheathed multicore cables with copper
conductors having a minimum cross-sectional area of 2.5sq.mm per core shall be
used. The number of cores may be standardized as 3, 5, 7, 10, 14, 19, and 24.
© !
Each core of control cable with 7 core and above shall be numbered at every 1-
meter interval.
For signals like mA and mV, special screened/shielded cables shall be used.
20% spare cores shall be provided with minimum 1 spare core in multi-core control
and signal cables.
1.01.13 Ventilation and Air Conditioning
The various electrical rooms of the plant shall be provided with ventilation and air
conditioning facilities, as indicated below. Air dryer units to be provided wherever air is
being used for purging / cleaning purposes .
All HT/LT substations, switch gear rooms and MCC rooms, cable basement/cellars
which do not house any electronic equipment but contain only electrical equipment,
shall be pressurized up to 2-3mm water column with cooled air washer system to
maintain the room temperature at 45 deg.C irrespective of ambient temperature.
Suitable capacity fan and pumps (1W+1S) shall be provided for each unit.
The electrical rooms housing electronic equipment like PLC , computers, Servers,
Level –II systems, Remote I/Os, AC and DC variable speed drives , soft starters , UPS
, electronic weighing panels , telephone exchange equipment etc. shall be installed in
air-conditioned environment with pressurization to maintain the following conditions:
Room temperature : Shall not be more than 35deg.
Relative humidity : 50 to 60%
Pressurization : 2-3 mm WC
Temperature gradient : 2 Deg. C/h
For central control rooms standby air conditioners shall also be provided.
Separate room, as part of control room shall be provided with window AC units.
©
These shall be ventilated with fresh filtered air to maintain exit air temperature at
40deg.C.
Cable tunnel ventilation shall be sectionalized to maximum length of 150 m.
Temperature rise shall be limited to 3-5 deg.C above atmospheric dry bulb
temperature subject to a maximum of 40deg.C at the exit of air from these
premises.
Partition door between basement and the cable tunnel shall be air tight and of fire
retardant material.
All cable tunnels shall be properly ventilated.
.05 General
The Automation system shall be designed with geographical & functional distribution of
hardware in a multi-level hierarchy, viz. Level-0, Level-1, level-2, level-3 etc, as
© "
applicable, to meet specific plant requirements for monitoring, control, process
visualization & optimization of all the plants/ shop units.
Level - 0
This level, also called field level, is functionally responsible for generation,
transmission & conversion of signals for the process parameters compatible to the
higher level equipment as well as signal based activation for the final control
elements.
This level is realized based on the primary sensing elements, proximity switches,
converters, microprocessor based intelligent systems and final control elements.
The components of this level shall be grouped and distributed geographically
around the plant as per main process equipment location.
Level-1
This level, also called supervisory level, is functionally responsible for supervision
of the individual process equipment & functions, monitoring, control, visualization
and regulation of process parameters to the desired level based on the signals
generated from the field level. This level is also responsible for processing of
signals for generating compatible control commands to control the process
parameters by activation of the final control elements.
This level is realized based on the controllers & systems, input & output systems,
data base units, data communication, visualization system (HMI stations) and
interface units for connectivity to the other levels of the automation system. In
addition to routine PID functions, advanced process optimization functions
comprising special control algorithms, mathematical computations etc. will be able
to permit distribution of control and data acquisition functions throughout the entire
plant.
Level-2
This level is functionally responsible for the process control functions through the
Level-1 automation system by process guidance & optimization and control of
process parameters to the desired level of perfection based on the available
signals from the supervisory level. This level is also called process control level
and is responsible for generating set points / control commands to the Level-1
equipment based on the pre-loaded process specific mathematical models. This
level is realized based on the process computer & its own data base units, input &
output systems, data communication systems, visualization system (HMI stations)
and interface units for connectivity to the other levels of the automation system.
Level-2 automation system has been covered under a separate General
Specification.
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The following modes of operation shall be provided, it shall be in line with changes
suggested in respective TS.
A. Local
Local Control Station (LCS) shall be provided for all motor and actuator drives.
LCS shall have required numbers of push buttons for operation of drive .
In Local Mode, operation of single drive / equipment from LCS shall be
provided. This mode of operation will generally be for test and repair
purposes. To enable the testing of individual equipment all the interlocks shall
be bypassed in this mode. However all critical equipment / drives shall be
provided with hard-wired interlocking in MCC.
However for failsafe operation, potential free contact of Push Button from LCS
and a potential free contact of field safety sensor shall be hard wired to MCC
for safety reasons.
Drive can not be started from any place if the selector switch is in OFF
position.
B. Remote
In Remote mode, the equipment can be started from control room only. This
remote mode is further divided into following three modes:
Operator mode
Auto mode
Computer mode (Level-2 system)
Once the remote mode of operation is selected then from HMI with help of key
board / mouse / soft keys above three modes of operation can be selected.
Operator Mode
Under this mode it shall be possible to monitor & control the plant based on set
points / commands given by operator through keyboard and the control,
sequential operation of various mechanisms in the required sequence shall be
executed by PLC with all interlocks. In this case all the changes / operations
are operator initiated.
Auto Mode
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This is the normal mode of operation of the plant. In this mode, the desired
values (set point) of the parameters of process control loop will be set via
keyboard of the HMI and sequencing and logic functions will remain operative
through the PLC as per application software.
There shall be a provision for group start of drives in individual section with the
required interlocks, logic and sequencing between the individual drives.
Computer Mode
In this mode the entire plant will be controlled through level-2 system. All the
required set points will be generated by level-2 computer as per the
mathematical model calculations based on the inputs received from the field.
In case of failure of the level – 2 system all the set points will be automatically
shift to operator mode of operation.
1. LTSS, MCC, PDB and MLDB shall be provided with 20% spare feeders or one of
each type whichever is higher with minimum of two numbers in each section
2. LDB, MCBDB for lighting and MCB DB for utility sockets shall be provided with
minimum 9 nos. of spare feeders.
3. DC MCB DB shall be provided with 8 nos. of spare feeders.
4. ACDB of UPS shall be provided with 40% spare feeders.
5. 20% spare terminals shall be provided in each module of MCC, MCP and each
ACB panel.
6. 20% spare terminals shall be provided in all junction boxes, LCS and local
control panels / local starters.
7. Control desk and control cabinet shall be provided with 30% spare terminals.
8. Marshalling panel of MCC and PLC shall be provided with 30% spare
terminals.
9. Relay panels / relay modules shall have 20% spare relays of each type fully
wired up to the terminal blocks.
10. 20% spare interposing relays fully wired up to the terminal blocks shall be
provided in PLC panels.
11. 10% spare components of each type shall be provided in each control desk
/control cabinet / signaling panel.
12. Spare I/O philosophy for PLC shall be as follows:
Min. of 20 % of I/O modules used (with at least one module of each type)
for input and output shall be offered as spare for each programmable
controller and the same shall be mounted and wired to the terminal block
in the cubicle suitably.
No. of spare Channel per card shall be 20 %.
Provision shall be provided with empty slots for future expansion for 20%
I/O modules.
Minimum 50 % spare memory capacity shall be available in the system for
Purchaser’s use after loading of application and system software.
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01 nos. of DI & DO card per PLC shall be provided as spare .
1. Hot standby dual redundant UPS system shall be provided. Each UPS shall be
rated for full capacity and under normal condition one UPS shall be sharing the
total load. In case of failure of any UPS second UPS shall take the full load.
2. Spare capacity of UPS shall be 60 %.
3. Load factor or diversity factor shall not be considered while calculating the load on
UPS.
4. Two separate power supply from different sources shall be provided to UPS – one
for UPS and the other for Bypass.
5. Bypass supply to equipment shall be through constant voltage transformer.
6. UPS and SMF batteries shall be located in air conditioned room.
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SL. DESCRIPTION OF EQUIPMENT COLOUR PAINT SHADE NO. AS PER
No. IS 5 : 1991 EQUIVALENT
RAL CODE
4. 415 V Welding sockets Brilliant green 221 6010
5. 230 V Power sockets Light orange 557 2000
6. 24 V transformer sockets, lamp sets Canary yellow 309 1016
etc.
7. Earthing strip Black
All the electrical drawings shall be prepared on CAE (computer aided engineering)
packages e.g. Si–Graph or any equivalent software package . The package shall have
the facility to connect all the relevant drawings with ERP / SAP package .It must be
OODB(Object Oriented Data Based) type.
The package shall have the facility to interface the most different systems in the plant
establishment and operational process. It shall have the facility to accommodate the
mechanical, civil, structural drawings also.
1.02 EQUIPMENTS
1.02.01 DRY TYPE TRANSFORMER
.1 Standards
Transformers shall comply with the following Indian Standards.
.2 Mechanical Design
.01 Transformer enclosure shall be welded/ bolted sheet steel construction, free standing,
with suitable size of louvers backed with wire mesh. Base shall be suitably reinforced
to prevent any distortion during lifting. Base channels shall be provided with flat wheels
with pulling eyes and lifting hooks to facilitate handling.
.02 All fasteners and bolts etc. shall be galvanised or zinc passivated. All surfaces to be
painted shall be thoroughly cleaned, made free from rust and given a primary coat of
rust resisting paint followed by two finishing coats of approved shade. Paint shall be
suitable to withstand specific climatic conditions.
.03 The transformer shall be provided with separate weatherproof HV/LV terminal boxes
and disconnecting links on the side of transformer so as to facilitate withdrawal of
transformer without disturbing the HT and LT cables connected to transformer.
.04 Tank shall be suitably designed to withstand harmonics available in the system as well
as generated by the transformer.
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.3 ELECTRICAL DESIGN
i) The transformer shall be cast resin dry type transformer, AN cooled suitable
for indoor installation( in a covered room).
ii) Generally as per IS 2026 – Part 1, 2 & 4 of 1977 and Part 3 of 1981.
iv) Rated output, voltage ratio, vector group shall be as specified in technical
particulars for design.
vi) Insulation level shall be designed according to the voltages specified below.
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xi) The maximum temperature at the end of the short circuit duration shall not be
more than 250°C with the temperature prior to short circuit
corresponding to maximum permissible overload.
xii) Transformer shall be designed for minimum no-load and load losses within the
economic limit.
xiii) Designed for suppression of harmonics, especially 3rd and 5th.
02. WINDINGS
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03. INSULATION
i) Inter-turn and inter-coil insulation shall be designed such that di-electric stress is
uniformly distributed throughout the windings under all operating conditions.
ii) The winding shall be provided with class F insulation or better (as applicable to
dry type transformer as per IS: 2026 part – II). However, temperature rise in
winding and core shall be limited to class B insulation.
ii) Designed for sustained over current of at least 150% of the rated current of the
winding
vi) Shall not occupy any intermediate position between clearly marked tap position.
05. TERMINATIONS
It shall be possible to withdraw the transformer easily after disconnecting the
connections without disturbing the cable terminations. Cable termination box shall be
bolted type and supported from bottom so that after withdrawing the transformer, it
remains at its same position.
Winding shall be brought out and terminated on external /cable boxes as specified in
the Technical Particulars.
i) Cable termination
a) Air insulated cable end box suitable for the type and number of cables
specified.
b) Air insulated disconnection chamber with inspection opening
c) Compression type brass cable glands with finned copper lugs of non
soldering crimped type.
d) Bolted type gland plated ( non magnetic material wherever specified).
e) Sealing kits with associated accessories like stress reliving , insulating
type, bi-fercating boot, HT insulating tape etc.
ii) Bus duct termination
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a) When bus duct termination is specified, flanged throat shall be provided to
suit the bus duct. Flange ends and inspection openings shall have
weather proof gaskets.
06. Bushings
i) Conforming to IS 3347 part-1,2 & 3 – 1979, Part 3&4-1988 and IS:2099-1986
for HT and IS 7421 for LT system.
ii) Minimum rated current of line end bushings shall be 1.5 times rated current of
the corresponding windings.
iii) Clamps and fittings made of steel or malleable iron shall be hot dip galvanized.
iv) Bushings rated 400 amps and above shall have non- magnetic clamps and
fittings only.
v) Bushing shall be solid porcelain type.
vi) Neutral bushings shall be provided as required for earthing of neutral point.
This shall be connected to brass/tinned copper bar and brought to outside the
body through porcelain insulator.
.07 NEUTRAL CURRENT TRANSFORMERS
i) Removable at site without opening transformer enclosure cover/active part.
ii) Secondary leads shall be brought to a weatherproof terminal box and from
there to the Marshalling box with 4 sq.mm copper armoured cable.
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.10 RATING PLATE
Each transformer shall be provided with a rating plate giving the details as per IS:2026
(Part-I). The marking shall be indelible and the rating plate shall be located on the front
side. Exact value of transformer % impedance, as determined by tests shall be
engraved on it and also on the final submission of name plate drawing.
.11 NOISE
Noise level shall be low and shall be within limit depending on the rating of the
transformer as per IEEE-141.
.12 Earthing
i) All metal parts of the transformer with the exception of individual core lamination
core bolts and clamping plates shall be maintained of fixed by earthing.
ii) Two nos. of tinned copper earthing terminals shall be provided.
iii) One end of bushing CTs shall be earthed.
.13 List of Fittings and Accessories
i) Off-circuit tap switch as specified.
ii) Dial type winding temperature indicators operated by RTD elements.
iii) Bushing CTs as specified.
iv) Bi-directional rollers/flanged wheels with loading arrangement.
v) Lifting lugs and jacking pads
vi) Rating and diagram plates.
vii) Earthing terminals.
viii) Inspection cover
ix) Identification plate
x) Pockets for thermometer for winding temperature indicator.
xi) HV, LV and Neutral bushings
xii) Marshalling box.
.4 TESTS
The equipment shall be subjected to all the routine tests at the manufacturer works in
accordance with latest version of IS2026 Part I and III or, the relevant IPSS (where
specified), in presence of purchaser or his representative.
Test of all equipment shall be conducted as per latest BIS. Test shall also confirm to
International Standards IEC/VDE/DIN/BS.
The tenderer shall submit type test certificates for similar equipment supplied by him
elsewhere. In case type test certificates for similar equipment is not available, the same
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shall be conducted in presence of Purchaser or his representative if Purchaser so
desires, without any financial implications to purchaser.
The transformer should pass the non-hygroscopic test according to DIN VDE-0532 and
confirm to class E2 to prevent formation of moisture creepage path and resulting in
failure of transformer.
The transformer should withstand the extreme load variation without any cracking of
the casting. For this test certificate according to DIN VDE 0532 is to be furnished.
All the equipment shall be tested at site to know their condition and to prove suitability
for required performance. The site tests and acceptance tests to be performed by
manufacturer are detailed below.
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- Recommended procedure for routine maintenance
- Tests for checking of proper functioning
- Diagnostic trouble shooting/ fault location charts
c) Storage, conservation and re-commissioning Manual
d) Safety Manual
.6 TECHNICAL PARTICULARS
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Sl. Particulars 1000/ 2000 kVA
No.
14. Neutral grounding Effectively earthed
15. HV Unearthed
System earthing
LV Effectively earthed
16. Percentage impedance 5% or 6.25% (as applicable)
17. Cable end box suitable for
termination of XLPE aluminium
HV
cables, with air insulated
Termination disconnecting chamber
Suitable for termination of
LV
Busduct with disconnecting
chamber
18. Temperature rise over 50°C ambient temp
a) In winding (measured by Resistance method) 80°C
b) Core and other adjacent parts of winding 80°C
Within safe limit of core and
c) Core and other parts not adjacent of windings
adjacent materials.
19. Bushing mounted CT’s
CT in LV Neutral bushing for standby E/F Ratio : 500/5 A
protection Class : 10P15
20. Off circuit tap changer Bolted Link type
a) Range ±5%
b) Total tap positions 5
c) Taps above nominal voltage 2
d) Taps below nominal voltage 2
e) Voltage per step variation 2.5 %
f) Tap change controls Manual
21. Impulse test withstand voltage As per IS 2026, Part III – 1981
22. One minute dry and wet power frequency - do -
withstand voltage
23. Short circuit level on HV side 40 kA for 3 Seconds
24. Time duration to withstand 3 phase short circuit 5 Secs.
at secondary terminals, without any injury.
25. Auxiliary supply voltage 240 V AC
26. Parallel operation Suitable for parallel operation
with transformers of similar
ratings
27. Overload capacity As per IS 6600 –1972
28. Paint & Paint shade Epoxy based (Shade 632 as
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Sl. Particulars 1000/ 2000 kVA
No.
per IS – 5)
Salient technical parameters to which the Circuit breaker panel shall conform
are as follows:
Service voltage 6.6/ 11 kV +6%, -9%
System Frequency 50 Hz +4%, -6%
Degree of enclosure protection IP 4X
Fault level in MVA 450/ 750MVA for 3 seconds
Type of CB Sulpher hexa fluoride (SF6)/
Vacuum Circuit Breaker(VCB)
Rating 1250A
No. of poles 3
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No. of breaks/pole 1
Location Indoor, floor mounted
Nominal current rating of bus bars same as main bus bar rating of
existing HT switchboard
Permissible temp. rise over ambient 45 oC
for switch board
Operating Mode Manual
Spring charging mechanism Manual
Cable termination Heat shrinkable termination kits
Connection of outgoing feeders Cable
2) The circuit breaker shall be maintenance free and shall have adequate
capacity, insulation and mechanical strength to withstand
a) In-rush magnetising currents of transformers
b) Starting currents of drives
c) Transient surges developed during various abnormal operating
conditions
d) All electrodynamic stresses developed during abnormalities like
faults in the system.
e) Frequent start/stop duty of the industrial load. Normally, 2 (two)
quick succession cold starts and one restart from hot condition or
3 starts per hour shall be considered for design duty.
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of a breaker on a single closing command shall be ensured. All circuit
breakers shall preferably be interchangeable.
4) The 6.6/ 11kV breaker shall be provided with electrical and mechanical
trip free features and an emergency mechanical push to trip the breaker.
All the features of the equipment shall ensure complete safety of the
operation and shall be complete with approved safety devices to protect
against potential hazards to operating personnel or to the equipment
around. The design shall include all reasonable precautions and
provisions for the safety.
5) All 6.6/ 11kV breakers shall be provided with at least 4 potential free
Aux. contacts to be used by Employer for their interlocking/signaling
purposes. Contact arrangement may be 2 NO + 2 NC and these shall be
rated for 10 amp current duty on the control and auxiliary voltages (both
AC & DC). Further, the following features shall be ensured in each 6.6/
11kV breaker panel:
a) Control plugs provided shall be mounted in horizontal fashion.
b) Mini bus earthing with proper interlocks.
c) All supporting insulators shall have increased creepage distance
as per IS and shall suit highly polluted atmosphere of steel
industry.
.2 Bus Bars
1) The Power Bus Bars of 6.6/ 11kV breaker panel shall be made of high
conductivity, electrolytic copper of purity 99.9% as per IS:613-1984 in
rectangular sections.
2) Horizontal and vertical bus bar shall be designed manufactured and
supported to withstand thermal and dynamic stress corresponding to
rated short time and peak withstand current as specified above.
3) Bus bar arrangement shall be as per IS:5578-1985 & IS:11353-1995.
Bus bar shall be sleeved with proper grade of insulating sleeves and of
proper colour code for each phase. Care shall be taken to obviate corona
formation at the joints and connections. All joints and connecting
terminals shall be tinned.
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4) Bus bar shall be housed in a separate bus bar chamber with adequate air
clearance and bushing. The insulators/ bushing shall be cast resin type to
offer higher mechanical strength, during short circuit fault.
5) The clearance between bus bars shall be maintained as per standard. The
bus bar chamber shall be provided with detachable side covers for
regular maintenance and inspection and have provision of extension on
both sides.
.3 Cable Chambers
The cable end termination chamber for each panel shall have adequate space for
the termination of required number, type and size of cables and shall be
provided with suitable bracings to support the weight of the cables without
undue stress on the terminals. These chambers shall be complete with all
accessories and shall form integral part of the cubicle and shall be freely
accessible for cable connection.
1.02.03.01 General
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• The 415V switchboard shall comprise air circuit breakers & shall be metal clad,
indoor type floor mounted(in fully drawout execution).Switchboard shall be in single
tier execution for incomers & buscouplers & two tiers for outgoing feeders.
• Relative position of incomers shall be as per the equipment layout requirement.
• Sheet steel shall be CRCA of minimum 2.0 mm thickness.
• Circuit breaker shall be mounted on fully drawout truck with service, test and
isolated positions and complete with following safety interlocks and safety shutters
with padlock facility :
It shall not be possible to move the truck in or out of cubicle when the
breaker is closed.
CB compartment door shall be mechanically interlocked so that it will not be
possible to close the CB in plug position when the door is open.
It shall not be possible to push the truck in close position if either of the
safety shutter is not free and not in close position.
• The position of various control switches, push buttons, levers etc. requiring manual
operation, shall be at a height not less than 450mm and shall not exceed 1850mm
from the finished floor level.
• Name plate for each incoming bus coupler, and outgoing feeder at front and back,
both on the fixed portion of the panel.
• All panels shall have space heater with switch and cubicle illumination lamp with
door switch
• All breakers of similar rating shall be interchangeable.
1.02.03.04 Busbars
• Busbars made of EC grade aluminium alloy equivalent to E91E WP as per IS
5082, 1981, size adequate for specified rated continuous and SC current.
• Jaw contact to be mounted on ACB and fixed contact to be mounted on the bus
side (as per the manufacturer’s standard).
• Three phase, neutral (with atleast 50% rating of main buses) and continuous earth
bus. Bus bar shall be provided with proper grade & colour of heat shrinkable
sleeve.
• Rating of horizontal buses shall be same as that of incomer circuit breakers and
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vertical run shall be same as that of outgoing breaker rating
• Temperature rise of bus bars shall not be more than 40 deg. C above an ambient
of 50 deg. C.
1.02.03.07 Relays
• Flush mounted
• Mechanically operated flag indicators with all relays capable of being reset
without opening casing
• Shall withstand impulse voltage in accordance with IS/IEC recommendation.
• Test facility by plug from panel front.
• CT secondary shall be shorted on relay withdrawal.
• Diagram plate at the back of case to identify connections.
• The relay shall be microprocessor based numerical and communicable type.
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• Auxiliary contacts : 6 NO + 6 NC minimum, convertible from NO
to NC and vice versa at site.
Ratings :
Continuous 10 amps
AC 11 4 amps at 240 V
DC 11 0.5 amps at 110 V
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• It shall be possible to open the door only when
breaker is OFF and
is in 'Isolated' position.
• Remote closing of breaker is not permitted with door open.
• Insertion of breaker into 'Service' position shall not be possible if the shutters are
not free.
• All connections external to a feeder, all the auxiliary contacts of the LT breaker,
and all spare contacts of the relays shall be wired on to the terminal blocks.
• Interconnection between panels of adjacent shipping sections to be brought out to
a separate terminal block, wires for interconnection properly labeled, looped and
bunched inside the panel for connection at site.
• Not more than two connections shall be carried out on one terminal.
06 External Terminations
06.1 Control Terminations
• 650V grade multiway terminal blocks of non-tracking moulded plastic complete
with insulated barriers, stud type terminals, washers, nuts and lock nuts and
identification strips.
• Power and control terminals segregated.
• Control terminals of minimum rating 10 amps suitable to receive 2.5 sq. mm
copper conductor.
• 20% spare terminals in each control terminal block.
06.2 Power Terminations
• Suitable for accepting cables/bus trunking as specified in the technical particulars.
• All spare contacts wired upto terminal block of the panels
a) Protective relays - withdrawable type
b) auxiliary, timer relays - fixed type
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07.02 Protection
The control unit shall offer the following protection functions as standard:
1. Long-time (LT) protection with an adjustable current setting and time delay;
2. Short-time (ST) protection with an adjustable pick-up and time delay;
3. Instantaneous (INST) protection with an adjustable pick-up and an OFF position.
4. Earth-fault protection with an adjustable pick-up and time delay.
.07.04 Communication
The circuit breaker shall be capable of communicating the following data through a
bus:
Circuit-breaker status (open/closed, connected/disconnected/test, tripped on a
fault, ready to close);
Control-unit settings, including protection setting parameters.
Tripping causes;
The measurements processed by the control unit: current, voltage, frequency &
power(active & reactive).
It shall be possible to remotely modify circuit-breaker settings:
Settings within the range defined by the switches on the front panel of the control
unit;
Settings of the protection functions and the alarms.
It shall be possible to remotely control the circuit breaker of identified
feeders only.(Viz. all incomers & buscouplers)
Communications functions shall be independent of the control unit.
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value.
10. Contactors
Contactors shall break without damage 8 times rated current upto 100 amp rating and
6 times rated current for above 100 amp rating. Continuous current shall not exceed 2
amp and initial pick up shall be limited to 9 amp. Class of insulation shall be E or better.
Drop out voltage shall be 45-65% of rated voltage and pick up shall be 85-110%
contactor duty shall be AC3 unless otherwise specified in design parameters.
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14. Indicating Lamps
i) LED cluster type.
ii)LEDs used shall be of the colour of the lamp.
iii)Color shall be as follows:
ON : RED
OFF : GREEN
CIRCUIT HEALTHY : WHITE 15.
FAULT/WARNING : AMBER C
SPRING CHARGED : BLUE o
n
trol and Selector Switches
• Control switches for circuit breaker ON/OFF control 3 position spring return to
neutral with lost motion device and pistol grip handle.
• Other control and selector switches - stay put type with wing type knobs.
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19. Auto Changeover Scheme
• Usually both the incomers shall be ‘ON” with bus-coupler in the ‘OFF’
condition.
• In case of failure of one of the supply feeders (say by upstream fault), it will be
sensed by the under-voltage relay which in turn will trip the incoming breaker
after a pre-set time delay.
• Through the normally closed auxiliary contacts of the tripped incoming
breakers, the bus-coupler breaker shall close provided the other section is
“Healthy”.
• The automatic transfer scheme shall be such that the automatic closing of the
bus section can be done only once and in case the bus coupler breaker trips
during auto changeover, no further auto closing shall be permitted. Auto
changeover shall not take place if the incomer breaker trips on fault. The
restoration of power shall be manual.
• The automatic transfer circuit shall be controlled through an auto manual
changeover switch.
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Outgoings Air circuit breakers
(Mounted in two tier arrangement)
Feeder requirement To be decided by the tenderer
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Sl. No. Schedule of components equipment Type of Feeder
specification B/C Incomer Out going
ACB Feeder
14. Impulse switch for tripping 6.6 kV or - 1 -
11kV breaker
15. Two position, two contacts stay put - 1 -
switch with pistol grip handle for
closing permission of upstream 6.6 kV
or 11kV breaker
16. ON/OFF indication lamp for upstream - 2 -
breaker.
17. Inter tripping push button to trip the - 1 -
upstream breaker
18. Analog Voltmeter with selector switch 1 2 -
19. Analog Ammeter - 3 -
1.02.04 LT BUSDUCT
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terminal box with heat resistant cables.
• Silica gel breathers at appropriate locations.
• Horizontal bends to be avoided by positioning the switchboard incomers at
appropriate place.
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di-electric strength, with an anti-tracking contour.
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- Board shall be single front, metal clad, front matched dust and vermin proof,
fully compartmentalized and extensible on both sides, IP51 type enclosure.
- Degree of protection for enclosure IP 52 or better for indoor installation, and
IP55 for outdoor part.
- Shall have base channel of size ISMC 75.
- Shall have isolated busbar chamber for main busbar at the top, running
through out the length of the board. Chamber shall have removable cover.
- Cable alley shall have sufficient space for aluminium power cables and bottom
cable chamber shall be left free completely isolated from the vertical busbars.
- Busbars shall have same cross section through out the length. Rating of the
neutral busbar shall be 50% of the main busbar. Earth bus bar shall run in
bottom chamber throughout the length of the panel.
- Shall have moulded case circuit breaker triple pole, air break type with
independent manual quick make and quick break type. MCCB shall be capable
of breaking rated current at .3 pf at rated voltage. MCCB shall withstand the
fault current envisaged for 415V system.
- All feeders shall have ON/OFF lamps and 96 sq.mm size ammeter.
- Incomers of board and outgoing shall be MCCBs with E/F protection .
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(vii) Bearings - For motor of rating upto 5 kW, ball bearings shall
be used for both DE & NDE end.
- For ratings above 5 kW the DE end shall be
provided with roller bearing and NDE end shall be
provided with ball bearing.
- Bearings for motors shall be of C3 clearance .
- Bearings shall be suitable for running of motor in
either direction.
(viii) Hazardous Area safety design As per requirement
(ix) Canopy To be provided for all outdoor motors .
(x) Greasing point At DE & NDE sides .
(xi) Paint shade Light grey shade 631 as per IS:5 or RAL 7030 (grey).
(xii) Direction of Rotation For crane and mill duty motors : reversible
For general purpose continuous duty motor :
Bidirectional (New point)
3.0 Terminal box
(i) Location Location on top preferably
(ii) Suitability - 4 Core Aluminium Cable
- Extension shall be done to receive the aluminium
cables to avoid cramping of the cables in the
terminal box .
(iii) Rotation 4 X 90 deg.
(iv) Earthing stud Inside Terminal Block
4.0 Cooling - TEFC
- Effective irrespective of direction of rotation
5.0 Quality of operation
(i) Vibration intensity Shall be limited as per IS 12075-1986.
(ii) Noise level As per IS: 12065-1987
(iii) Balancing Motors shall be dynamically balanced with full key on
the shaft- end and fan
6.0 Electrical design
(i) Power Supply • 415 V +10 & - 15%
• 50 Hz +/- 6%
• 3-phase, 4-wire AC
• 50 kA for 1 second, solidly earthed.
(ii) Starting DOL
(iii) Min Voltage for Start & Run 85 % of rated voltage at terminal
(iv) Starting Torque >= 160 % Rated Torque
(v) Breakdown or pullout torque Minimum 275 % of the rated torque
(vi) Starting current <= 600% Rated current
(vii) Duty S1/ ……or as specified in TS
For crane duty S5 40% with 150 start/hour.
For conveyor application S-3 and 6 starts / hr
For continuous duty- efficiency class EFF-1.
(viii) Starts/Hour permissible 3 equally spread or 2 in quick succession from cold or
one hot start, under rated load condition..
(ix) Max speed permissible 120% over speed for 2 minutes
(x) Overload capacity Capable of withstanding 60% Overload for 15 sec.
(xi) Efficiency All continuous duty motor (S1-100%) shall be of high
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efficiency confirming to eff2 class as per IEEMA-19-
2000 .
(xii) Derating Motor designed at 50 deg.C shall be derated suitably
for mentioned ambient temperature .
(xiii) Motor connections Motor with frame size 90 shall be connected in star
and of frame sizes more than 90 shall be connected in
delta .
For delta connected motors 6 leads shall be brought
out .
(xiv) Insulation Class F
(xv) Minimum Permissible Limited to class 'B' (120 deg absolute)
temperature rise
(xvi) Torque Type Normal / High / High slip type / Stall Torque type
(as required for the specific application)
(xvii) Space Heater Out door motors above 45 kW
Indoor Motor above 110 kW
(xviii) No. of Poles 4 pole
(unless specific drive requirement or economics call
for other poles).
(xix) Testing As per approved QAP during engineering stage .
(xx) Mounting Normally horizontally foot mounting .
Other type of mounting as per specific requirement .
02. Low voltage slip ring induction motors (Only for cranes and mill duty) :-
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(v) Protection for Motor & Bearing IP55 degree of protection as per IS : 4691.
(vii) Slip rings − All motors to have continuously rated slip rings.
− Phosphor bronze or steel slip rings shall be
provided .Cast iron slip- rings shall not be used .
− Brush holders shall be in a complete assembly
unit .
− Slip ring unit shall have a cover with inspection
window .
− For higher range of motors, separate disc is
provided between the slip ring and rotor
windings to prevent carbon dust ingression into
windings.
(viii) Bearings - For motor of rating upto 5 kW, ball bearings shall
be used for both DE & NDE end.
- For ratings above 5 kW the DE end shall be
provided with roller bearing and NDE end shall be
provided with ball bearing.
- Bearings for motors shall be of C3 clearance .
- Bearings shall be suitable for running of motor in
either direction.
(ix) Hazardous Area safety design As per requirement
(x) Canopy To be provided for all outdoor motors .
(xi) Greasing point At DE & NDE sides for online greasing facility without
dismantling the motor.
(xii) Paint shade Light grey shade 631 as per IS:5 or RAL 7030 (grey).
4.0 Terminal box
(i) Location On top preferably
(ii) Suitability - 4 Core Aluminium Cable
- Extension shall be done to receive the aluminium
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cables to avoid cramping of the cables in the
terminal box .
(iii) Rotation 4 X 90 deg.
(iv) Earthing stud One earthing stud shall be provided in the terminal box
and two terminals on mounting feet.
(v) Stator and rotor connections Separate and distinctly marked terminal box to be
provided for stator and rotor connections.
(vi) Protection class IP 55 in all the cases .
(vii) Cable glands Suitable for double compression type cable glands .
5.0 Cooling - TEFC design only
- Effective irrespective of direction of rotation
- The cooling code of motor is IC 411 as per IS :
6362.
6.0 Quality of operation
(i) Vibration intensity Shall be limited as per IS 12075-1986.
(ii) Noise level As per IS: 12065-1987
(iii) Balancing Motors shall be dynamically balanced with full key on
the shaft- end and fan
7.0 Electrical design
(i) Power Supply • 415 V +10 & - 15%
• 50 Hz +/- 6%
• 3-phase, 4-wire AC,
• 50 kA for 1 second, solidly earthed.
(ii) Starting DOL or thyristor converter (ASTAT or SIMOTRAS or
equv.) Soft starter feature through static voltage
control/VVVF as per application
(iii) Min Voltage for Start & Run 80 % of rated voltage at terminal
(iv) Breakdown or pullout torque Pull out torque of the intermittent duty motors to be not
less than 300% of the rated torque at 40% duty factor.
(vi) Starting current <= 600% Rated current
(vii) Duty Duty cycle shall not be less than S4-40% , with a
minimum of 150 starts per hour (600 starts / hour for
charging cranes and other process cranes) .
For conveyor application S-6 duty.
(viii) Starts/Hour permissibe Mechanically and electrically shall be suitable for
required number of switching / reversals or starts per
hour.
(ix) Max speed variation 250 % of rated synchronous speed at high
accelerating rates and rapid reversals .
(x) Max speed 250 % of rated speed or 2000 rpm whichever is less .
(xi) Rated synchronous speed Motors shall be of low synchronous speed for ease of
dynamic balancing of hoist rotating unit .
The motor speed preferably shall be as follows :
Upto 37 KW :- 1000 rpm
Above 37 KW upto 90 KW :- 750 rpm
Above 90 KW :- 600 rpm
(xii) Overload capacity 1.5 times the rated current for 2 minutes
(xiv) Void
(xvi) Derating Motor designed at 50 deg.C shall be derated suitably
for mentioned ambient temperature .
(xvii) Insulation Class H
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(xviii) Torque Type Normal / High / High slip type / Stall Torque type
(as required for the specific application)
(xix) Space Heater Out door motors above 45 kW
Indoor Motor above 110 kW
(xx) Over temperature detection and Slip ring motors for essential drives to be provided with
protection. Pt 100 resistance thermometers / thermocouples or
thermistors .
(xxi) No. of Poles Not applicable
(xxii) Testing As per approved QAP during engineering stage .
(xxiii) Mounting Normally horizontally foot mounting .
Other type of mounting as per specific requirement .
(xxiv) Derating Motors shall be derated considering all the factors
− variation in voltage and frequency .
− Ambient temperature
− Thermal ability due to constant and variable
losses of the motor
− Type of load driven
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iv) Motor body Grey iron casting as per IS:210-1978
v) Casing Feet Integral with the motor frame
vi) Body Design Prevent breakage or other failures due to vibrations
normally encountered in heavy industries
vii) Protection for Motor & Bearing IP – 55 as per IS 4691-1985.
viii) Shaft Forged Steel shaft
ix) Bearings (below 1000kW ) Anti-friction Bearing with Regreasing facility & with
grease quantity controllers
Bearings - Pedestral type sleeve bearing with forced oil
(1000kW & above) lubrication. (Arrangements to be incorporated to
prevent lubricating oil from reaching the windings)
.
- Bearing temperature, lubricating oil temperature
and pressure to be measured and monitored .
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important HT motor .
− In case no differential protection is required, star
point of the winding may be formed inside the
neutral terminal box to be provided on one side of
the motor. The phase segregated terminal box
shall be placed on other side of the motor.
v) Suitability − Termination of XLPE cables with heat shrinkable
cable end seals.
− Each terminal box to have two inlets to
accommodate any parallel cables as required.
vi) Reversible To suit cable entry from Top / Bottom
vii) Earthing stud Inside TB for protective earth conductor termination
viii) No. of terminal boxes Separate for Space heaters, RTDs / BTDs , Vibration
monitor etc
ix) Fault withstand (Min.) Rated Short circuit level of the system voltage for
0.25 sec
4.0 Cooling TEFC / CACA / CACW
CACW system shall be complete with temperature
and pressure monitoring devices.
5.0 Quality of operation
i) Vibration intensity Limited to 37.5 micron peak to peak.
ii) Noise level Continuous noise level should not exceed 85 db A at
a distance of 1.0 m from the motor body as per IS:
12065-1987.
iii) Balancing Dynamically balanced with full key on shaft end and
fan
6.0 Electrical design
i). Efficiency High efficiency design of 96% at Full load
ii) Starting DOL
iii) Min Voltage for Start & Run 80 % of rated voltage at terminal
iv) Starting Torque As specified in application
v) Starting current <= 600% Rated current
vi) Duty S1
vii) Starts permissible 3 successive start from cold condition OR 2
successive start from hot condition.
viii) Starts / hour 3 equally spread in normal Voltage, Frequency & Load
ix) Max speed permissible 150 % rated for 2 minutes
x) Differential protection Required for1000 kW & above
xi) Insulation Class F & confirming to IEC 34 - 15/1990
xii) Insulation Material Cast resin rich / VPI
xiii) Minimum Permissible Limited to class 'B' (120 deg absolute)
temperature rise
xiv) Space Heater Required & automatically off during RUN
xv) No. of Poles 4 (or as mentioned specifically)
xvi) Locked rotor current withstand 5 sec longer than starting time under rated load
time condition.
xvii) Surge protection As specified
xviii) Operational design Suitable to VCB Breaker
xix) Motor winding and inter turn Shall be fully insulated using mica insulation. For such
insulation, connections and motors surge absorbers (with non-linear resistance)
©
leads: shall be provided within 10 to 15 meters from the
motor terminals to limit the over voltages.
OR
In case mica is not provided in motor insulation, both
surge capacitors and surge absorbers (with non-linear
resistance) shall be provided within 10 to 15 mtrs from
the motor terminals to limit the over voltages and rate
of rise of voltage.
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xv) Vibration monitoring − Vibration monitoring (online) shall be provided at
the DE end of motor bearing for motors of ratings
1000 kW and above and it should be connected
to PLC for online monitoring .
xvi) Paint shade − Light grey , shade no. 631 as per IS 5
3.0 Terminal box
i) Protection IP - 55
ii) Type Phase segregated
iii) Location − RHS viewed from DE / On top
− 01 nos. each on opposite sides of motor in case
of Differential Protection (or not) / Neutral TB
opposite to main TB
v) Suitability − Termination of XLPE cables with heat shrinkable
cable end seals.
− Each terminal box to have two inlets to
accommodate any parallel cables as required.
vi) Reversible To suit cable entry from Top / Bottom
vii) Earthing stud Inside TB for protective earth conductor termination
viii) No. of terminal boxes Separate for Space heaters, RTDs / BTDs , Vibration
monitor etc
ix) Fault withstand (Min.) Rated Short circuit level of the system voltage for
0.25 sec
4.0 Cooling TEFC / CACA / CACW
CACW system shall be complete with temperature
and pressure monitoring devices.
5.0 Quality of operation
i) Vibration intensity Limited to 37.5 micron peak to peak.
ii) Noise level Continuous noise level should not exceed 85 db A at
a distance of 1.0 m from the motor body as per IS:
12065-1987.
iii) Balancing Dynamically balanced with full key on shaft end and
fan
2.0 Design Motors shall be of cylindrical design with brush less
excitation system and automatic voltage and power
factor regulation.
3.0 Power factor 0.9 or better.
4.0 Motor winding Motor stator winding braced for full voltage starting.
Squirrel cage type winding with short circuited rotor
bars for producing starting torque and accelerating
torque to bring the synchronous motor upto the speed
All the three windings stator , rotor and exciter shall
be VPI (Vacuum pressure impregnation) .
5.0 Bearings Small frame size motors shall have endshield
bearings and large motors shall have pedestral
bearings .
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6.0 Cooling All the three modes of cooling arrangement as per
requirement
• Open air (for the areas where air is relatively
clean e.g water supply pump houses)
• Air to water (in closed cooling circuit)
• Air to air cooling (ID fan etc.) . A shaft
mounted fan or a separate fan to be provided
for air circulation .
7.0 Excitation method Brushless excitation system (Integral exciter and
rotating rectifier assembly to eliminate the need for
brushes and slip rings both on exciter and motor
respectively) .
8.0 Automatic system power factor Motor field to have micro processor based thyristor
correction. controlled static excitation system (for automatic
system power factor correction).
9.0 Motor synchronism protection Field monitor relay to be provided for monitoring the
power factor of the system which in turn trips the
motor and the exciter field off if synchronism is not
achieved within a specific length of time or if the
motor pulls out of step .
10.0 Insulation class Class F insulation for field windings as well as for
stator with temperature rise limited to 70 deg. C (as
measured by resistance method) over an ambient of
50 deg. C.
11.0 Locked rotor withstand time Motors shall be capable of withstanding locked rotor
current for atleast 5 second longer than starting time
under rated load condition.
12.0 Starting method DOL / Auto transformer starting method / Load
commutated inverter (LCI)
13.0 Space Heater Space heater to be provided.
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- 10:1 constant torque speed range motors may
exceed frame standard by one frame rating.
B Motor body Grey iron casting as per IS:210-1978
C Motor Feet Integrally cast with the stator
D Body Design - Prevent breakage or other failures due to
vibrations normally encountered in heavy
industries .
- Motors shall be of weather proof construction.
- Designed to operate in the humid air stream .
E Protection for Motor & Bearing IP - 55
F Motor Shaft Shall be provided with an external recessed slinger at
the drive end of the motor to provide additional
(minimum IP-54) protection from moisture and
foreign material.
G Shaft ends & Extension - Cylindrical as per requirement
- Shaft shall be extended for encoder / tacho.
mounting , accordingly suitable hole shall be
drilled and tapped .
H Internal Encoder Motors with speed variation of 1000:1 at constant
torque shall have internal builtin encoder for speed
feedback
I Bearing - Roller type bearing upto 5 kW .
- Ball Bearing at NDE end for above 5 kW .
- All motors shall have fully re-greasable, anti-
friction bearings.
- All motors shall have cast iron inner bearing caps.
- Bearings shall be oversized .
- All motors shall have a charged lubrication system
to inhibit moisture condensation.
- Standard motors shall have extended grease
fittings on the opposite drive-end to facilitate re-
lubrication. Grease ports shall be located on the
periphery of the motor endshield.
- Motor shall be fitted with a shaft slinger or V ring
seal on the drive end for a minimum of IP-54
protection (to help protection of bearing from
ingress of dust , dirt or fluids) .
J Hazardous Area safety design NA
4.0 Terminal box
A Location RHS viewed from DE / On top
B Suitability - 4 Core Aluminium Cable
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- The terminal box shall be oversize as compared to
NEMA requirements .
C Rotation 4 X 90 deg.
D Earthing stud Inside Terminal Block
E Miscellaneous - Shall be gasketed between the terminal box
halves.
- The conduit box shall be field convertible to cast
iron.
- External screws and bolts shall be grade five, hex
heads and be plated to resist corrosion.
5.0 Cooling - TEFC, Effective bi-directional
- TENV (for roller table duty)
- Motor with 1000:1 speed range and constant
torque shall have external fan .
- External fan motor shall be 3 phase , 415 V AC
- Thermistors shall be provided in the windings.
6.0 Quality of operation
A Vibration intensity - Shall be limited as per IS 12075-1986.
- Shall not exceed .08 inches / second velocity.
B Noise level As per IS: 12065-1987
7.0 Electrical design
A Power Supply 415 V +10 & - 15% , 50 Hz +/- 6% , 4-wire AC, 50 kA
for 1 second, solidly earthed.
B Starting Variable Frequency Drive
C Service factor - 1.0 for VFD power .
- 1.15 for sine wave power .
D Peak transient voltage 1600 V
E Minimum rise time 0.1 microsecond
F Starting Torque 200 % rated torque for 1 minute below base speed
G Constant horsepower operation 1.5 times base speed .
H Duty Application dependent
I Max speed permissible 150 % rated for 2 minutes
J Derating for VFD As per above mentioned standard
K Insulation Class H limited to class F .
L Load Type Constant Torque / Variable Torque
(As per application)
M Space Heater - Out door motors above 45 kW
- Indoor Motor above 110 kW
N No. of Poles 4/6/8
8.0 Operating Characteristics
A Operation with variation in the Motors shall operate successfully under running
© !
voltage or the frequency conditions at rated load with variation in the voltage
or the frequency not exceeding the following
conditions:
• +/-10% rated voltage at rated constant V/f ratio
except for specific torque boost situations.
Motors shall operate successfully under running
conditions at rated load and V/f ratio when the
voltage unbalance at the motor terminals does not
exceed one percent.
B Torques Motors shall meet or exceed the minimum locked
rotor (starting) and breakdown torques specified in
NEMA Standard MG1 Part 12 for Design B for the
rating specified when on sine wave power.
C Operating speed range - Zero to base speed in case of VT.
- 1000: 1 for CT (with blower cooling)
- 10:1 , 6:1 , 4:1 for CT .
D Locked rotor (starting) currents Shall not exceed NEMA Design B values for the
specified rating on 5:1 constant torque or less and
variable torque motors. NEMA Design A values are
allowed for 6:1 constant torque or higher value
constant torque rated motors.
Motors shall be capable of a 20 second stall at six
times full load current without injurious heating to
motor components.
E Efficiency - Shall have a nameplate minimum and nominal full
load efficiency for motors when tested in
accordance with NEMA standard MG1 Part 12,
IEEE Test Procedure 112 Method B, using
accuracy improvement by segregated loss
determination including stray load loss
measurements.
9.0 Motor location Outdoor / indoor installation .
1.0 Painting For indoor motors :
Total thickness of painting shall be 140 microns.
For outdoor motors:
Total thickness of painting shall be 240 microns.
11.0 Nameplate - Shall be of corrosion resistance stainless steel .
- In addition to standard nameplate information
following informations shall be included :
o Nominal efficiency .
o Bearing identification numbers.
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o Power factor.
o Torque values with speed range and amps for
that torque value.
o Full Load Slip RPM.
o Magnetizing amps
o Encoder PPR and Voltage rating (if included).
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• Manual / hand release shall be provided in case
of power failure or other failure in the system .
13.0 Maintainability of brake coil Brake coil connection brought to appropriate
terminal box for ease in maintenance and terminals
covered for protection against accidental touch.
14.0 Residual magnetic gap To increase the residual magnetic gap for reducing
adjustment brake application time anti magnetic shim shall be
provided .
15.0 Brake panel Necessary rectifier and brake forcing equipment
shall be included for DC electro-magnet brakes
used with AC system.
16.0 Installation of brake panel DC electromagnetic brake panel shall be installed in
MCC room
1.0 Enclosure protection All field switches to have enclosure class IP-65 in covered
area & IP-67 in open area.
2.0 Contacts Minimum separate contacts 2NO & 2NC for interlocks and
as required for process.(with external JB)
1.0 Resistor design To meet arduous heavy duty industrial and steel works
application, unbreakable, rigid, resilient & rust less.
2.0 Material Fechral edge wound
3.0 Duty rating 10 minutes rating of BS: 587 and conforming to IPSS No. 1-
10-002-82 and addendum No 1 to IPSS (March 1985).
4.0 Construction Every turn of every grid is fully supported so that adjacent
turns and adjacent grids can neither vibrate nor distort so
as to make mutual contact.
The complete grid is spot welded to its neighbors thus
eliminating slacken support due to heating and cooling and
is mounted on mica insulated high tensile steel tie-rod and
mica creepage washers.
A tripping point is formed on each grid by a hole in the
welded portion which is double thickness and absolutely
flat.
All grids shall have either zinc alloyed or cadmium plated
surface for permanent weather proofing. Highest quality
mica and porcelain insulated terminals are to be used
© !
throughout.
The thermal loading of the resistance box should be
uniform.
5.0 Painting All metal works for the housing shall be degreased,
derusted and passivated before applying two coats of
stove enamel.
6.0 Terminals The terminals shall be easily accessible at the lower most
stack.
7.0 Enclosure class IP-30 or better for outdoor application and IP-11 for indoor
application
8.0 Testing Testing shall be carried in accordance to BS: 587.
9.0 Power resistors for Shall be of Fechral edge wound resistance boxes .
crane control The element design shall be either circular (Russian
design) or elliptical (BHEL design) .
Punched grid resistance boxes shall not be used for crane
control .
1.0 Basic design particulars - Digital control technology with vector control (with /
without PG as per requirement) .
- IGBT based with sine coded PWM control.
- VFD shall communicate to basic automation system on
system communication bus .
- Suitable for variable torque or constant torque
applications requiring harmonic control as defined by
IEEE 519-1992.
- The drive shall have an internal EMC filter capable of
meeting the Second Environment levels for the EMC
directive without the need for additional components.
- Shall confirm to IEC 146 - International Electrical Code.
- For 4 quadrant operational drives , active front end type
VFD shall be provided .
- Where speed control I desired for production and quality
control VFD isto be provided .
- Where speed control is not required sof t starter or motor
intelligent controllers are to be provide.
2.0 Drive controller - Software configurable to either V/Hz (single or multi
© !
technology motor) mode or Sensorless Dynamic Torque Vector
mode (single motor).
- Full, closed loop flux vector control shall be available for
constant torque applications.
- Operating the drive with motor disconnected.
- Adjustable PWM carrier frequency within a range of 3 –
15 KHz.
- Suitable for use on both CT & VT loads.
- Multiple programmable stop modes including - Ramp,
Coast, DC-Brake, Ramp-to-Hold and S-curve.
- Multiple acceleration and deceleration rates.
3.0 Type of connection - Three full wave diode rectifiers supplied by phase shifted,
three phase AC to provide a fixed DC voltage.
- DC bus inductor on all ratings
- DC link capacitors
- Insulated Gate Bipolar Transistor (IGBT) power section,
shall be rated for variable / constant torque applications.
The power section shall use vector dispersal pulsewidth
modulated (PWM) IGBT gate control algorithm and soft
switching IGBT’s to reduce motor terminal dv/dt and allow
longer cable length from drive to motor without output
filters.
- The Main Control Board shall be the same for all ratings
to optimize spare parts stocking and exchange
- Common control connection for all ratings.
4.0 Overload capacity - 110% of the rated current for 1 minute , 30 seconds at
150% (with inverse characteristics proportional to time)
for variable torque applications . Repetition interval shall
not be less than 9 minutes
- 150% of the rated current for 1 minute overload , 30
seconds at 200% (with inverse characteristics
proportional to time) and 200% of rated current for 0.5
sec. for constant torque applications . Repetition interval
shall not be less than 60 minutes .
5.0 Efficiency More than 97% or better at full speed and full load.
6.0 Input power supply - 415 V AC +10% & -15%
- 3 phase .
- 50 Hz + / - 6 %
- 4 wire neutral earthed system .
7.0 Voltage variation - Voltage variation of (+/-) 0.1 % with an input variation of
+10% - 15%.
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- Steady state regulation of (+/-) 0.25% guaranteed against
100 to 200 % load disturbance and + 6% & -6% input
supply frequency variation.
- The drive should be designed to operate on an AC supply,
which may contain line notching, and up to 10% harmonic
distortion.
8.0 Environmental conditions
8.1 Storage ambient Upto to 70º C (-40º to 158ºF).
temperature range
8.2 Operating ambient IP42 & above : 0º C to 50º C (0º to 122º F)
temperature range
without derating.
8.3 Relative humidity Upto 100% non-condensing.
8.4 Operating elevation Up to 1000 Meters (3,300ft) without derating.
8.5 Shock 15G peak for 11ms duration
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10.4 Output frequency 0.01 Hz.
resolution
11.0 Reflected wave Maximum of 3.15 times the bus voltage or 1600V, whichever
is less, up to cable lengths of 200 metres.
12.0 Starting torque 150 % / 0.3 Hz. (without PG)
150 % / 0 RPM (with PG)
13.0 Torque accuracy +/-5%.
14.0 Speed control accuracy + / - 0.02 % .
IR compensation to be provided for drive without PG .
15.0 Ramp rate - Linear acceleration and deceleration adjustable
independently from 0 to 3600 seconds .
- Provision of remotely selectable Accel / Decel settings
should be accessible through digital inputs also.
16.0 Main power - ACB / MCCB with 50 KA rating
components in - Matching input isolation transformer / line reactor for
incoming AC side harmonic and noise suppression . For input isolation
transformer , the K factor shall be 4.0 or less.
- AC line surge suppression network .
- Input contactor .
17.0 Converter –Inverter - Diode / Thyristor bridge for AC/DC.
Equipment - DC link circuit with reactor/capacitor
- IGBT bridge for Inverter for DC/AC.
- Harmonic transformer .
- Main PLC to take care of interlocking and sequencing etc.
- Mimic panel (where drive is HT)
18.0 Load side components - Filter network
- Electronic over-load relay for each motor (with display).
- Line contactors in output side (if required).
- Output reactor / terminator (if required)
19.0 Terminal blocks - Separate for control and power wiring.
- Power terminal blocks to withstand a minimum of 90 ºC
and marked for both inputs and outputs .
- Uniform color-coding to be followed for cabling, TB, etc.
20.0 By-pass Arrangement By-pass arrangement shall be provided to operate the motor
in case of failure of VFD.
21.0 Diode Bridge Minimum ratings of Diode cells.
- PIV rating : 2.5 times the peak value of line voltage
- dv/dt rating : 200V/microsecond for voltage control and
1000V/ microsec. for
inverter control.
- di/dt rating : 100A / microsecond.
22.0 Input / Outputs - Hard-Wired I/O
© !
• Hardwired I/O should be provided via separate I/O cards
- Standard I/O Card
• The “Standard I/O board should consist of both digital
and analog I/O. It should be available in two versions;
one for 115/240 VAC digital I/O and one for 24V AC/DC
digital I/O.
- Analog I/O
• Differentially isolated ±10V (bi-polar) / 20mA analog
inputs .
- Digital Outputs
• Relay outputs – Minimum 04 nos.
• Contact output ratings should be 240V AC / 24V DC,
Maximum 2.0 Amp
23.0 Protective features AC line surge suppression network and overvoltage
protection .
- Under voltage in supply network
- Phase sequence protection and monitoring
- Single phase failure
- Motor loss
- Under voltage in DC bus
- Over voltage in DC bus
- Over speed protection in the event that the output
frequency exceeds the maximum reference by a specified
amount.
- Over load
- Earth fault
- Instantaneous over current
- Transformer fault ,If applicable
- Cooling fan failure
- Stall monitor for motor alarms
- Controlled shut down, when properly fused, with no
component failure in the event of an output phase to
phase or phase to ground short circuit and annunciation of
the fault condition.
24.0 Annunciations Following faults shall be annunciated in keypad of the drive /
HMI .
- AC line surge suppression network and overvoltage
protection .
- Under voltage in supply network
- Phase sequence protection and monitoring
- Under voltage in DC bus
- Over voltage in DC bus
- Over speed monitor
- Over load
- Earth fault
© !"
- Instantaneous over current
- Transformer fault ,If applicable
- Cooling fan failure – Stall monitor for motor alarms
- Motor fault (winding / bearing temperature, vibration) as
applicable
- Loss of frequency command
- Shall be able to store at least 16 previous faults in memory
on FIFO sequence .
In addition to annunciations in keypad , a separate
annunciation window shall be provided on front door of
the VFD panel .
25.0 Meters - Output voltmeter and ammeter with selector switches.
- Input volt meter and ammeter with selector switches .
- Output frequency meter (digital type).
- KW meter for drive ratings above 200 KW.
All digital display shall be programmable .
26.0 Other features
26.1 Bus Regulation DC Bus regulation should be available to reduce the
possibility of drive overvoltage trips due to regenerative
conditions.
26.2 Load dependent current Programmable current limit from .1 amps to 150% of drive
limit rated amps. Current limit to be active for all drive states;
accelerating, constant speed and decelerating.
26.3 Dynamic Braking The drive shall have an internal, built in 7th IGBT for use as a
dynamic braking chopper. This IGBT shall have enough
capacity to handle greater than or equal to 100%
regeneration power from the output, continuously. The drive
shall also have a “drive mounted” dynamic braking resistor
for low level braking applications and interactive software to
protect the “internally” mounted resistor from abuse.
26.4 Fault Memory 16 nos. of faults to be stored on FIFO basis for fault analysis .
26.5 Ride Through The control logic should be capable of "riding through" a
power outage of at least 0.5 seconds in duration. The inverter
section should be shut off after an 18% drop in bus voltage
to conserve power for the drive logic.
27.0 Selector switches - Local / Remote .
- Auto / Manual .
- Main / Bypass .
All the selector switches shall be of 10 A rating .
28.0 Pushbuttons - Trip reset .
- Start.
© !#
- Emergency stop.
29.0 Lamps - Drive ready .
- Drive trip .
- R , Y , B phase power ON .
- Control supply ON .
All the lamps shall be of cluster LED type having low voltage
glow protection..
30.0 Regulation & control - Reference speed setter
facilities - Ramp generator
- Speed feed back
- Current feed back
- Flying start
- Trigger module
- Pulse transformers
-Logic control module
- Sequence module
- PID control
- Zero speed / over speed monitor as applicable
- Momentary power loss restart .
- Auto tuning .
- Current limiter
- Skip Frequency
- Counter current / regenerative braking unit as applicable
- Active electronic components used shall be of industrial
grade hermetically sealed .
- Output signals for fault alarm , frequency arrival , running
signal .
32.0 Remote control facilities - Shall have transducer to monitor the outputs like motor
speed at remote place / HMI .
- Facility to accept speed reference from HMI / engineering
station.
33.0 Auto / Manual Mode - The HIM should utilize the ALT function key to transfer
the drive from Automatic mode to Manual mode and
back.
- When in Auto mode, the drive to receive its frequency
command from the programmed source.
- When in Manual mode, control of the frequency
command to be transferred to the HIM speed control
keys (or potentiometer).
- The user should have the choice of preloading the HIM
with the current “auto” frequency reference before
transferring control to allow for smooth transitions
without speed “jumps”.
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34.0 Communication Bus RS485 (ModBus, ProfiBus-DP, DeviceNet) bus
Internally mounted interfaces shall be provided to connect to
different buses .
35.0 Test points Two electronic test point parameters should be available to
examine data within the drive memory that is not available
through other parameters.
36.0 Operator panel Shall be mounted on the front door of the unit .
IP 66 protection class .
- All adjustments to be made with the door closed.
- Status and Power LEDs viewable through the cover
- Status LEDs for communications status, including
embedded DPI status, adapter health and
communications network status, viewable through the
cover .
37.0 Membrane keypad - The keypad shall be logically designed for two operating
areas with required number of keys.
- Local operator control like
- local start /stop ,
- jog forward / reverse .
- Programming .
Facility to run the drive without HIM shall be provided .
38.0 LCD display - Display shall be black lighted , enabling viewing in
extremes of lighting conditions
- Display shall be in alphanumeric (in English only)
- 21 characters , 7 lines .
- All the faults stored in memory shall be displayed by
scrolling .
39.0 Construction features - Floor mounted, free standing
- Dust and vermin proof
- Sheet steel clad
- Minimum 2.5 mm thick for panels.
- Minimum 2.0 mm thick for doors and side covers.
- Suitable to withstand vibrations to be encountered in steel
plant application.
- Cubicles with illumination lamps, door switches, space
heaters and adequate sockets for soldering.
- All control blocks plug–in-type with necessary test sockets.
- Units shall be self contained and serviceable.
40.0 Enclosure and - Enclosure conforming to IP-42 or better with weather
ventilation proof enclosures
- Units shall be provided with cooling fans and louvers at the
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bottom sides with filters.
All louvers shall have fine mesh filter behind them.
- Ventilation through individual ventilation ducts from
bottom not acceptable.
- For larger drives cooling fans of drives shall be powered
from different power source .
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1.0 Standard IEC 146-1-2
2.0 Power System Input 3 Phase AC , +/- 10% of rated voltage
3.0 Input voltage dip 30 % of rated voltage without tripping
4.0 Frequency 50 Hz. , +/- 6%
5.0 Operating environment 50 deg. C , with 95 % RH non condensing
6.0 Type of motor to be Synchronous motor
controlled
7.0 Efficiency More than 99%
8.0 Isolation transformer - Indoor installation
- Oil or dry type as per IEC 76-2
- Typical winding configuration :
• 6 pulse LCI :– Delta-Wye
• Pulse LCI :- Delta-Delta-Wye
- Taps : 2x2.5% above and below nominal voltage .
- Winding conductor : Copper
- Insulation class : Class H (In case of dry type)
9.0 Bridge device Thyristor
10.0 Configuration
(i) Source bridge AC fed 6 or 12 pulse SCR , regenerative with N+1 devices
(ii) Load bridge 6 or 12 pulse output configuration with with N+1 devices .
11.0 Output speed control 10 – 160% of rated speed .
range
12.0 Overload 150% overload for 1 minute / every 10 minutes (for CT loads)
110% overload for 1 minute / every 10 minutes (for VT loads)
13.0 Control • Forced commutation below 10 % of rated speed .
• Load commutated above 10 % of rated speed .
• Torque regulated .
• 4 quadrant speed control .
• Volt / Frequency control
• Field excitation control
• Programmable acceleration / deceleration ramps
14.0 Control accuracy Without tacho With tacho
(i) Speed regulation 0.1 % 0.005 %
(ii) Max. starting torque 0.75 PU 2.0 PU
(iii) Max. forward speed 1.0 PU 1.0 PU
(iv) Max. reverse speed 0.5 PU 1.0 PU
(v) Constant HP speed Base to top Base to top
range
(vi) Constant torque speed 0.1 to base 1.5 Hz to base
range
15.0 Torque reversal DC link voltage reversal by firing of anti parallel thyristors in
principal the bridge .
No contactor is to provided for the same .
16.0 Protection • Overcurrent
• Overvoltage
• Earthfault
• Over temperature
• Motor bearing and winding temperature measuring and
protection
17.0 Cooling • Water cooled with deionized water
• Redundant cooling pump with automatic control
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18.0 Auxiliary power supply 415 V AC , 3 phase , 50 Hz.
19.0 Reliability N+1 SCR redundancy (extra SCR in each bridge circuit) for
full power output even in the event of a device failure .
21.0 Loudness Less than 70 Db at 1 metre from enclosure
22.0 I/O • Standard I/O’s as per manufacturer .
• In addition to standard I/O’s , a dedicated PLC in the drive
panel for sequencing and interlocking of all the hardware
interlocks of the LCI .
23.0 Metering • Analog meters mounted on drive panels .
• For remote monitoring required transducers/ converters for
transmission of signals in HMI .
24.0 Feedback devices • Encoder for position feedback
• Tacho for speed feedback
25.0 Communication bus • Profibus / Controlnet / Modbus compatibility.
In case of making compatible with PLC communication bus ,
required hardware and software to be provided .
26.0 Cable entry • Top or bottom cable entry with no additional cubicle
A. General
1.0 Type Metal clad .
Non drawout type
2.0 Construction Modular construction .
Fully compartmentalized with metal / insulating material
partition.
3.0 Enclosure class IP52
IP 54 for non intelligent MCC’s installed in non airconditioned
environment .
4.0 Type of execution Single front.
©
on one side and screwed at other side .
• All the components shall be accessable from front .
• Motor controller shall be flush mounted on the respective
door .
• Interchangeable facility of same type of feeder modules
• Each module to have covering at the bottom.
• ACB cubicle door shall close when the ACB is in isolated
position.
4.0 Interlocking & Module door interlocked with main power isolating devices.
protection Power circuit isolation device to have pad locking in the OFF
position with door closed.
5.0 Operating height Minimum :- 300mm
Maximum :- 2000 mm.
6.0 Gland plate Undrilled removable bottom gland plates (3 mm thick)
7.0 Miscellaneous Neosprene rubber gasket shall be provided for all the doors ,
removable covers & between adjacent covers
Lifting hooks for all the shipping sections
Doors shall have concealed hinges .
8.0 Labelling Clear legible identification labels (anodized aluminium with
white letters engraved on black background ) with letter sizes
of :-
25-50 mm for MCC panel in front and back side of the panel .
5 mm for components and module name plates.
Danger board on front and rear sides in English , Hindi .
9.0 Earthing Two separate earthing terminals will be provided.
Bolted joints with tooth spring washers for good earth
continuity.
Earth bus to run in all cable alley of the panel .
10. Shipping length To be limited to 2.4 M.
©
1.0 Arrangement Three phase & neutral.
6.0 Busbar configuration Red-yellow-blue from front to back or top to bottom or left to
right as viewed from front.
7.0 Busbar insulation Heat shrinkable PVC
R,Y,B coloured sleeves for phases
Black for neutral.
8.0 Busbar supporting Non-hygroscopic
insulators Flame retarded
Track resistant
High strength
Sheet moulded compound or equivalent polyster fibre glass
moulded type .
9.0 Max. temp. rise of bus Not to exceed 40 deg. C. above ambient of 50 deg.C.
© !
2.0 Size Minimum 25 x 3 mm .
(iv) Power supply bus for motor controller (from UPS)
1.0 Voltage 240 V AC , 50 Hz.
1.0 Material Copper.
2.0 Size Minimum 25 x 3 mm .
D. Insulation level
1.0 Rated insulation voltage 1100 V
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Controller power supply healthy
11. Communication Each motor controller (motor / feeder) unit shall communicate
on the communication bus (Devicenet / Modbus / Profibus)
with PLC directly or through Data concentrator / CN2DN
converter or any equivalent module / converter .
The communication protocol (bus) for intelligent MCC and
package PLC shall be same for ease of communication .
12. Communication Port 2 nos. RS 485 serial port
13. Communication Trunk line configuration ( with dual redundancy) in horizontal
configuration wireways.
Dropline configuration (with dual redundancy) in vertical
wireways .
Each Data concentrator / CN2DN converter or equivalent
module shall communicate with PLC on higher level
communication bus e.g Controlnet / Profibus / Modbus etc .
14. Communication speed 9.6 Kbps minimum (100 m distance)
15. No. of nodes (without Minimum 32 nos.
repeaters)
16. Control From 16 character keypad and backlit LCD alphanumeric
display provided on the controller.
From HMI (located in control room).
The keypad shall have the facility to start and stop the motor
through a separate key (touch screen type) or separate PB’s
are to be provided for the same on the front door of the
module .
17. Software All the configuration and monitoring shall be done through
inbuilt software .
All the required software required for operation and
communication shall be provided with latest version available.
F. Feeder arrangement
Incomers and Buscoupler
1.0 Isolating Equipment 3 pole manual ACB
4 pole manual ACB (for DG source as second Incomer)
Both the Incomers and Buscoupler shall be drawout type .
2.0 Quantity Two incomer
3.0 Bus coupler Required.
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5.0 Interlocking type Electrically .
Mechanical (through castle key)
6.0 Indication Lamps LED cluster type indicating lamps for :-
MCCB / ACB ON/OFF/TRIP.
Power ON R / Y / B .
Lamps will be of M/S Binay optoelectronic make of 22.5 mm
dia.in all cases . However model shall be freezed during
detailed engineering .
7.0 Meters and selector 96 sq.mm size voltmeter with 7 position selector switches
switches 96 sq.mm size ammeter with 4 position selector switches
8.0 Current transformer 3 numbers for protection .
3 numbers for metering .
1 number neutral CT .
I number interposing CT (if required)
9.0 Potential transformer 1 number
10.0 Relays (mounted in Microprocessor based relay with
each ACB) O/L
S/C
E/F
protections .
The relays shall have communication facility with PLC on
communication bus.
F. Outgoing feeder arrangements
(i) Motor Starter feeders
1.0 Circuit breaker Three pole MCCB .
Three pole ACB (for rating above 630 A) .
2.0 Power contactor AC3/AC4 as per requirement.
3 pole.
Minimum 32 A at AC-3 duty.
Contactor coil rating for 240 V AC .
2NO + 2NC auxiliary contacts.
Mechanically interlocked for reversible drives.
3.0 Auxiliary contactors Required nos. as per scheme.
4.0 Control supply isolation MCB
device
5.0 Test PB Inside module for testing of power contactor when the module
incoming power breaker is OFF
6.0 Space heater power For motor feeders of 45 KW and above :-
provision Through separate MCB and interlock with main power
contactor .
7.0 Ammeter in LCS Interposing CT shall be provided in the feeder module for
© #
motor rating 37 KW and above.
8.0 Thermal overload relay Electronic type (with indication for motors of rating 37 KW and
(for non intelligent above)
MCC’s)
9.0 Motor controller
A. Protections Thermal overload
Adjustable overload prealarm
Earth fault
Stalling
Unbalance
Short circuit
Single phase prevention
Under current
Too many starts
Under voltage
Under voltage lockout
Breaker or contactor failure alarm
Trip failure alarm
Over temperature
Winding and bearing temperature (for motor of rating 160 KW
and above).
B. Display data Voltage
Frequency
Power factors
Power consumption , KW
Thermal capacity
Temperature
Phase and average Amp.
Earth fault current
% motor load
% unbalance
Peak current during starting
Starting time
Pre trip values
C. Fault / alarm history No. of trips
description No. of operations ( Forward / reverse)
Hours run
Hours run last start
Kilowatt hours
Kilowatt peak demand
Alarm / trip history (with date and time)
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Alarm / trip description
Reference start curve (in graphics)
Start curve (in graphics)
Time to trip / reset
(ii) Power supply feeders
1.0 Circuit breaker Three pole MCCB.
Three pole ACB (for rating above 630 A) .
2.0 Indications ON/OFF/TRIP indication lamp.
3.0 Earth fault protection Yes
required
G. Panel wiring
1.0 Power / current 1.1kV grade single core , black colour PVC insulated ,
transformer circuit stranded copper conductor of minimum size 2.5 sq.mm.
For feeder rating 100A and above all the power circuit shall
be through rigid busbar .
2.0 Control and potential 1.1kV grade single core
circuit Black colour PVC insulated
Stranded copper conductor of minimum size 1.5 sq.mm.
3.0 Ferrules Numbered plastic/ceramic ferrules.
Self locking type.
4.0 Marking Wiring will be properly marked as per relevant IS.
5.0 Spare contacts All spare contacts of relays selector switches & contactors will
be wired upto the terminal block.
Each components shall have at least one potential free spare
contacts.
6.0 Terminals - Power & control terminals shall be segregated by
insulating material like hylam/bakelite sheet.
- Power terminals will be stud type.
- Control terminals will be ELMEX type suitable for
connecting two cores of 2.5 sq.mm wires.
- Minimum 20 % spare terminals will be provided.
- The minimum rating of control terminal shall be 10 Amps.
- Color coded wires, TB’s of different voltage rating to be
provided .
- Uniform color-coding to be followed for cabling, TB, etc.
7.0 Cable glands Double compression cable glands for receiving external
power and control cables
H. Control Supply
1.0 Control transformer 1 nos. of 415V/240V control transformer of minimum 2.5 KVA
in each section.
Secondary unearthed.
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2.0 Input and output side Input side :- MCCB
isolation device Output side :- MCB
3.0 Control supply Control supply auto and manual changeover through
changeover system contactor logic and through selector switch respectively
(Sel.sw. shall have a contact rating of 25 A at 240 V AC)
A. General :-
1.0 Type - Metal clad .
- Non drawout type.
2.0 Construction - Modular construction .
- Fully compartmentalized with metal / insulating material
partition.
3.0 Enclosure class IP52.
4.0 Type of execution Single front.
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11.0 Panel space heater In each panel with thermostat , MCB .
C. Busbars
1.0 Arrangement Three phase & neutral.
6.0 Busbar configuration Red-yellow-blue from front to back or top to bottom or left to
right as viewed from front.
7.0 Busbar insulation Heat shrinkable PVC
- R,Y,B coloured sleeves for phases
- Black for neutral.
8.0 Busbar supporting - Non-hygroscopic
insulators - Flame retarded
- Track resistant
- High strength
- Sheet moulded compound or equivalent polyster fibre
glass moulded type .
9.0 Max. temp. rise of bus Not to exceed 35 deg. C. above ambient of 50 deg.C.
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1.0 Pollution Degree Pollution Degree 3
as per IS-13947 (Part-1) : 1993 ;
unless otherwise stated
F. Components
1.0 Isolating Equipment 3 pole MCCB (upto 630A)
3.0 Meters and selector - 96 sq.mm size voltmeter with 7 position selector switches
switches - 96 sq.mm size ammeter with 4 position selector switches
7.0 Auxiliary contactors - Shall be provided for logic operation and operating
sequence .
- Shall have minimum 2NO+2NC auxiliary contacts.
G. Panel Wiring
1.0 Power / current 1.1Kv grade single core , black colour PVC insulated ,
transformer circuit stranded copper conductor of minimum size 2.5 sq.mm.
1.0 Power / current 1.1Kv grade single core , black colour PVC insulated ,
transformer circuit stranded copper conductor of minimum size 2.5 sq.mm.
2.0 Control and potential - 1.1Kv grade single core
circuit - Black colour PVC insulated
- Stranded copper conductor of minimum size 1.5 sq.mm.
3.0 Ferrules - Numbered plastic/ceramic ferrules.
- Self locking type.
4.0 Marking - Wiring will be properly marked as per relevant IS.
5.0 Spare contacts - All spare contacts of relays selector switches & contactors
will be wired upto the terminal block.
- Each components shall have at least one potential free
spare contacts.
6.0 Terminals - Power & control terminals shall be segregated by
insulating material like hylam / bakelite sheet.
- Power terminals shall be stud type.
- Control terminals shall be suitable for connecting two cores
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of 2.5 sq.mm wires.
- Minimum 20 % spare terminals shall be provided.
- The minimum rating of control terminal shall be 10 Amps.
- Color coded wires, TB’s of different voltage rating to be
provided .
- Uniform color-coding to be followed for cabling, TB, etc.
7.0 Cable glands Double compression cable glands for receiving external
power and control cables
I. Control Supply
1.0 Control transformer 1 nos. of 415V/240V control transformer of minimum 2.5 KVA
Secondary unearthed.
2.0 Input and output side Input side :- MCB
isolation device Output side :- MCB
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- Shall have bypass mode . Motor can run in
bypass mode in DOL .
- Soft starter mode or bypass mode can be
selected through selector switch mounted on
front side of the panel .
- In auto mode soft starter shall start / stop after
getting command from PLC.
- Shall have the facility of kickstart .
- Shall be able to communicate to PLC on dual
redundant communication bus . Accordingly
suitable cards / modules shall be mounted .
12.0 Protections - Short circuit
- Overload .
- Under voltage protection
- Current monitoring in each phases
- Transient voltage suppressor (MOV)
- Heat sink overtemperature protection
- Over temperature switches on each pole.
- RC Snubber ckt.
- Semiconductor fuse to be provided before the
soft starter controller .
- Single phase protection
13.0 LED Indications - Power ON (green)
- RUN (amber)
- Fault (red)
- O/C trip (red)
- Phase loss trip (red)
- Auxiliary trip (red)
B. General :-
1.0 Type - Metal clad .
- Non drawout type.
2.0 Construction - Modular construction .
- Fully compartmentalized with metal / insulating
material partition.
3.0 Enclosure class IP52.
4.0 Type of execution Single front.
5.0 Mounting - Floor mounting.
- Free standing with ISMC 75.
6.0 Installation Indoor.
C. Constructional Features :-
1.0 Sheet steel
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Thickness - 2 mm for load bearing members.
- 1.6 mm for non load bearing members.
Material CRCA
2.0 Cable entry - Incomer :- Bottom cable entry.
- Outgoing :- Bottom cable entry.
3.0 Design - Rear access through removable rear hinged
cover door.
- All the components shall be accessable from front
4.0 Interlocking & protection - Module door interlocked with main power isolating
devices.
- Power circuit isolation device to have pad locking
in the OFF position with door closed.
5.0 Operating height - Minimum :- 300mm
- Maximum :- 2000 mm.
6.0 Gland plate Undrilled removable bottom gland plates
(3 mm thick)
7.0 Miscellaneous - Neosprene rubber gasket shall be provided for all
the doors , removable covers & between adjacent
covers .
- Lifting hooks for the panel .
- Doors shall have concealed hinges .
8.0 Labelling - Clear legible identification labels (anodized
aluminium with white letters engraved on black
background ) with letter sizes of :-
25-50 mm for panel .
- 5 mm for components and module name plates.
- Danger board on front and rear sides in English ,
Hindi and local language .
9.0 Earthing - Two separate earthing terminals will be provided.
- Bolted joints with tooth spring washers for good
earth continuity.
10.0 Paint shade Shade No. 631 as per IS-5:1992./ RAL 7035
11.0 Panel space heater In each panel with thermostat , fuse , switch.
D. Busbars
1.0 Arrangement Three phase & neutral.
2.0 Material High conductivity electrolytic aluminium alloy
confirming to grade E91E as per IS-5082 –1981.
3.0 Phase Busbar Rating Shall be able to carry continuously the connected
load (considering all derating factors) plus a 25%
margin .
Max. current density shall be
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1.0 A/sq.mm for Aluminium
1.5 A/sq.mm for Copper .
4.0 Neutral Busbar Rating 50 % of phase busbar rating
5.0 Short circuit rating 50 KA for 1 sec.
6.0 Busbar configuration Red-yellow-blue from front to back or top to bottom
or left to right as viewed from front.
7.0 Busbar insulation Heat shrinkable PVC
R,Y,B coloured sleeves for phases
Black for neutral.
8.0 Busbar supporting insulators Non-hygroscopic
Flame retarded
Track resistant
High strength
Sheet moulded compound or equivalent polyster
fibre glass moulded type .
9.0 Max. temp. rise of bus Not to exceed 35 deg. C. above ambient of 50
deg.C.
10.0 Air clearance for bare busbar Phase to phase :- 25.4 mm (minimum)
Phase to earth :- 19.0 mm (minimum)
11.0 Joints and tap off points Busbar joints and tap off points shall be shrouded
and bolted ( with cadmium coated bolts with plain
and spring washers and locknuts).
Bimetallic connectors for connection between
dissimilar metals .
Antioxide grease for all bus connections .
12.0 Neutral bus isolation Through disconnecting link .
13.0 Busbar access Rear side
(ii) Earth bus
1.0 Material GI.
2.0 Size Minimum 50 x 6 mm with extension at both ends .
(iii) Control bus
1.0 Material Copper.
2.0 Size Minimum 25 x 3 mm .
E. Insulation level
1.0 Rated insulation voltage 1100 V
2.0 Impulse withstand voltage 4 Kv as per IS-13947 (Part I) 1993
3.0 One minute power frequency 2.5 Kv for power circuit & 500 V for control circuit
withstand voltage
F. Pollution Degree
1.0 Pollution Degree Pollution Degree 3
as per IS-13947 (Part-1) : 1993 ;
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unless otherwise stated
G. Components
1.0 Isolating Equipment 3 pole manual ACB
2.0 Indication Lamps LED type indicating lamps for :-
ACB ON/OFF/TRIP.
Incoming power R / Y / B .
Auto / Remote / Local .
Soft starter mode / bypass mode .
Motor ON / OFF / TRIP.
3.0 Meters and selector switches 96 sq.mm size voltmeter with 7 position selector
switches
96 sq.mm size ammeter with 4 position selector
switches
4.0 Power contactor AC3 duty of rated capacity .
5.0 Thermal overload relay Electronic type
CT operated
Shall be connected in bypass mode .
6.0 Auxiliary contactors Shall be provided for logic operation and operating
sequence .
Shall have minimum 2NO+2NC auxiliary contacts
suitable for 5A DC .
7.0 Door mounted operating devices Start / stop operating PB.
Reset PB.
Selector switches :-
Auto / Remote / Local .
Soft starter mode / bypass mode .
H. Panel Wiring
1.0 Power / current transformer circuit 1.1Kv grade single core , black colour PVC insulated
, stranded copper conductor of minimum size 2.5
sq.mm.
2.0 Control and potential circuit 1.1Kv grade single core
Black colour PVC insulated
Stranded copper conductor of minimum size 1.5
sq.mm.
3.0 Ferrules Numbered plastic/ceramic ferrules.
Self locking type.
4.0 Marking Wiring will be properly marked as per relevant IS.
5.0 Spare contacts All spare contacts of relays selector switches &
contactors will be wired upto the terminal block.
Each components shall have at least one potential
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free spare contacts.
6.0 Terminals Power & control terminals shall be segregated by
insulating material like hylam / bakelite sheet.
All control field wiring terminals shall be front access
.
Power terminals shall be stud type.
Control terminals shall be suitable for connecting
two cores of 2.5 sq.mm wires.
Minimum 20 % spare terminals will be provided.
The minimum rating of control terminal shall be 10
Amps.
Color coded wires, TB’s of different voltage rating to
be provided .
Uniform color-coding to be followed for cabling, TB,
etc.
7.0 Cable glands Double compression cable glands for receiving
external power and control cables
I. Control Supply
1.0 Control transformer 1 nos. of 415V/240 V control transformer of
minimum 2.5 KVA .
Secondary unearthed.
2.0 Input and output side isolation Input side :- MCCB
device Output side :- MCB
3.0 MCCB for motor MCCBs for motor feeders shall be motor protection type
feeders conforming to type-2 co-ordination. (MCCB without overload
not available. EOCR is being used)
4.0 Short circuit rating 50 kA (Minimum) (Ics =Icu).
5.0 Service Short circuit 100% of rated ultimate short circuit breaking capacity (Icu)
breaking capacity (Ics)
6.0 Operating handle Yes
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Padlocking in ON/OFF position
8.0 Withstand capability Rated short time with-stand current (Icw) will be 12 times
maximum rated operational current for 1 sec.
9.0 Utilisation category AC23B
10.0 Electrical features - S/C , O/C, E/F protection for power supply feeders &
crane trolley line feeder MCCB’s.
- Features to minimise the let-through energy (I2t) in the
event of short circuit on load side.
- Complete with continuous electronic / microprocessor
based adjustable thermal and magnetic releases.
- MCCB’s for motor feeders shall be of motor duty class
with magnetic trip only . Overload protection shall be
through electronic overload relays .
11.0 Auxiliary contacts 1 NO + 1 NC
Alarm contacts.
12.0 Miscellaneous Can be used in load side or line side vice versa.
Shunt trip coil .
02. AC CONTACTORS
1.0 Service Indoor within steel cubicle for maximum system voltage,
starting of motors and miscellaneous loads
2.0 Standard Shall conform to IS / IPSS
3.0 No. poles 3 pole air break .
4.0 Operating type Magnetic coil operated at 240 V AC.
No economy resistors.
Insulation for coils shall be class 'E' or better
5.0 Rating 32A (Minimum) , Rated for 125% of full load motor rated
current for DOL motor feeders and 150% of motor rated
current for RDOL motor feeders.
6.0 Interrupting capacity Ten times the rated current for rated size upto 100A and
eight times the rated current for larger sizes.
7.0 Duty According to IEC 158-1
- AC 1 duty :- Non inductive or slightly inductive loads .
- AC 2 duty :- Slip ring motors : starting , plugging
- AC 3 duty :- Squirrel cage motors : starting , switching off
motors during running
- AC4 duty :- Squirrel cage motors : Plugging , inching.
Derated AC4 ratings shall be selected for inching and
plugging operation of the drive (crane duty).
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8.0 Utilisation category AC23A for unidirectional motors
AC24A for bi-directional motors
9.0 Aux. contact - Minimum 4 NO +4 NC contacts with minimum rating of
requirement - 10A , 415 V.
- 2A , 220 V for rated duty DC-11.
- Shall have the facility of adding add-on contact blocks.
10.0 Closing (pick-up) 85% to 110%
11.0 Dropout Will not be higher than 75% and lower than 40% of rated
control supply voltage
12.0 Miscellaneous For RDOL feeders the power contactors shall be
mechanically interlocked.
1.0 Type Bar type primaries and 5A (max) secondary with thermal and
dynamic ratings corresponding to the units with which they
are used.
2.0 Accuracy class - Measuring CT accuracy class 1.0.
- Protective CT accuracy class 10 P 10.
1.0 Basic details - Shall not damage by passage of fault current or existence
of over voltage for the maximum permitted duration of
fault conditions.
- Ammeters for drives above 30 kW shall be CT operated.
- Voltmeters protected by fuses placed as close to the
busbar as possible.
- Maximum reading 600% of IFL for motor feeders .
2.0 Mounting Flush mounting, square dial with zero adjusting device for
external operation .
3.0 Accuracy class 1.5
4.0 Size - Size of voltmeter and ammeter for incomer 144 x 144 mm
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for incoming feeders.
- Size of ammeter for motor feeders 96 x 96 mm.
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actuator for "EMERGENCY STOP" application and key
"STOP" application for "LOCK-OUT" application shall be
provided.
- Mushroom actuator for Emergency Stop shall be latched
type.
- Press to latch in operated position and turn-to- release in
unactuated position.
- Double break parallel contact design or other suitable
design feature enhancing contact reliability required in
circuits with electronic interfaces involving low voltages
and small currents shall be adopted.
3.0 Size - 22.4 mm diameter
4.0 Contact rating - Minimum 2 NO + 2NC contacts with following current
ratings .
• Continuous - 10 A
• AC 11 - 1.5 amps at 240V
• DC 11 - 0.5 amps at 110 V DC, L / R - 40 ms
- All contact faces of contacts shall be of silver or silver
alloy.
- Facility of adding add on contact blocks to be provided
5.0 Colour • Accept - Blue
• Test - Yellow
• Reset - Black
6.0 Protection class - IP 66/ 67
- The P.B. switches shall be with higher contact reliability,
electronics compatibility .
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indication.
- General purpose indication, : White
motor `AUTO TRIP’.
Other colours may be adopted depending upon particular
application as approved by the Purchaser.
6.0 Protection class IP 66/ 67
7.0 Layout of indication • Indicating lamps shall be located just above the associated
lamps on boards / push-button / control switches.
panels • Red lamps shall invariably be located to the right of green
lamps.
• In case a white lamp is also provided, it shall be placed
between red and green lamps along the centre line of
control switch/ push button pair.
• Blue and Amber should normally be located above the Red
and Green lamps.
• When associated with push buttons, red lamps shall be
directly above the green push button and green lamp shall
be directly above the red push button.
8.0 Legend plates Anodised aluminium
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as per the circuit and control/operational requirement.
- The contacts shall be designed for higher contact
reliability and electronics compatibility involving low
voltage and small value of currents.
- The operating handle shall be robust and strong.
- One number of potential free switching contact for each
position shall be provided as spare.
- Control switches for circuit breaker ON/OFF control 3
position spring return to neutral with lost motion device
and pistol grip handle.
- Other control and selector switches - stay put type with
wing type knobs.
3.0 Contacts 2 NO + 2 NC contacts with minimum rating of
- All the selector switches shall be of 10 A rating
- 25A for sturdy applications .
- 1 NO & 1 NC contact / poles shall be potential free for
PLC inputs .
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Shrouded type .
11.0 Lamp details (if any) High density LED type .
12.0 Location of selector Local / Remote selector switches shall be installed in the LCS
switches
13.0 Terminal blocks - Shall be able to terminate wires of 2.5 sq.mm size .
- Not more than two wires shall be terminated in a single
terminal block .
- Shall be mounted on D-channels .
- 30 % spare terminals shall be provided .
- Colour of TBs for different voltages shall be different.
- Uniform color-coding to be followed for cabling, TB, etc.
14.0 Miscellaneous LCS shall act as field junction box also for wiring termination
from Limit switches, PCS, BSS and other field devices.
Facility for termination of minimum 5 nos. 19X2.5 core shall
be provided.
15.0 Provision of ammeter. For motors of more than 45 KW ammeters along with 4
position selector switches shall be provided .
16.0 Earthing Earthing studs shall be provided on two opposite sides .
Internally the earthing studs shall be connected with the body
through green colour PVC insulated copper flexible wire .
17.0 Paint Shade no. 631 of IS : 5 - 1992.
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requirement.
• Construction and switch layout to provide comfortable
operation .
9.0 Lamp test PB To be provided
10.0 Contact details of • All the components like ON/OFF PB's , selector switches
components . etc. shall have 2NO + 2NC contacts / poles of 10 A rating.
• 1 NO & 1 NC contact / poles shall be potential free for
PLC inputs .
11.0 Emergency stop push • Emergency stop push button shall be installed on top right
button details side of the control desk .
• Emergency PB shall be :-
o RED in colour.
o Mushroom headed.
o Press to lock and turn to release type .
12.0 Start push button • GREEN in colour.
details • Shrouded type .
13.0 Lamp details High density LED type .
14.0 Terminal blocks • Shall be able to terminate wires of 2.5 sq.mm size .
• Not more than two wires shall be terminated in a single
terminal block .
• Shall be mounted on D-channels .
• 30 % spare terminals shall be provided .
• Colour of TB’s for different voltages shall be different.
• Uniform color-coding to be followed for cabling, TB, etc.
15.0 Spare switches • At least 02 nos. of each types of switches and indication
lamps are to be provided as spare in each desk .
• Two numbers of drilled holes are to be provided . The
holes shall be plugged with rubber cap .
16.0 Earthing Earthing studs shall be provided on two opposite sides .
Internally the earthing studs shall be connected with the body
through green colour PVC insulated copper flexible wire .
17.0 Paint Shade no. 631 of IS : 5 – 1992 or RAL 7032
01 The electrical control system shall be laid on distributed hierarchical concept with a
great extent of decentralization of control functions so that individual system shall be
autonomous in operation as far as possible.
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The system shall be sufficient to perform all the functions required of them & shall be
designed to achieve high degree of accuracy of control functions.
Two hierarchical levels has been envisaged as indicated below :-
• Individual drive control level (Level-0)
• Functional group control level (Level-1)
This shall comprise of motors, field devices, HT/LT Switchgears, Intelligent MCC's,
Local control stations, speed control equipment etc. which are to be connected to
Level-1 System.
All process drives shall be generally be controlled from Central control room through
Operator workstations / VDU's and keyboards. Use of Control desks / Control Cabinets
shall be restricted to specific drives / emergency operation only.
All drives shall be provided with sel.switch for local operation / maintenance. LCB’s shall
be provided with start & stop PBs, Local / Remote Selector switch, any other devices /
lamps for the operation of the equipment. Stop PB shall be lockable type with key to
release.
For all motors, drive status (ON/OFF, open/close, forward/reverse) tripping due to O/L,
earth fault, equipment fault, process faults etc. shall be displayed in VDUs.
Where speed control of process drives are envisaged, the speed indicator shall be
provided in VDU.
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1.02.15. Automation System :-
01. General
A. Automation System Architecture
1.0 System - Client server architecture
Architecture
2.0 Redundancy - Dual redundant CPU with hot standby mode (Application
software based redundancy is not acceptable).
- Dual redundant communication bus with dual
communication cards / dual redundant interface module
for the communication bus and each I/O chassis to be
installed in each I/O rack / scanner units and
synchronizing modules .
- Two numbers of servers shall be provided with hot
redundant mode .
- Power supply redundancy .
- Respective I/O rack shall act as a node to the I/O bus for
interfacing with processor rack and shall not be interfaced
through back plane extension between two or more I/O
racks.
3.0 Speed of commn. Preferably 5 MBPS or better .
interface at I/O Data loss shall not be more than 4 % .
level
4.0 Connecting ports - Cat.-5, UTP cable with provision for 2 nos. additional UTP
ports .
- Two ports for connection to Level-2 network shall be
considered for the network.
5.0 Level-2 network In place of industrial ethernet, any other deterministic
communication bus network of 10 MBPS or better (Bus based on open protocols
at minimum 4 OSI layers) may also be considered in which
case, separate gateway interface with two UTP ports with
TCP/IP protocol on Ethernet shall be provided for Level-2
network.
B. General
1.0 Control Philosophy - All process data acquisition & monitoring functions,
process control (PID), interlocking, logic & sequence
controls of drive and various systems shall be performed
by the PLC.
- PLC’s shall be connected to two different bus levels in the
network . It shall communicate with RIO’s , intelligent
MCC’s , VFD’s , Soft starters, weigh panels etc. on
Profibus / Modbus / Controlnet while with HMI’s and HMI
cum ES on high speed Ethernet bus through server . The
Ethernet switch provided shall be manageable type .
- The automation system shall cover all the sections of the
entire plant .
- A separate server shall be provided for MIS terminals to
be located in welfare building of the individual shop
through communication link switch .
- Communication gateway shall be provided for
communicating the system with plant network system of
the plant .
- For displaying the alarms and faults in the mobile handset
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of the authorized person a modem for GSM shall be
provided in the network .
- PLC installed in mobile equipments like stacker cum
reclaimer etc. shall communicate with the main server
through wireless communication . All the required
hardware and software shall be provided for the same .
2.0 Data signals - The PLC envisaged in this package shall exchange
exchangeability signals with RIO / Instrument panel / VFD / MCC's /
with PLC Weigh Feeder Panels / dedicated position control system
panels (if any) / Level 2 system computers / other PLCs of
the plant.
- However all the critical equipment / drives shall be
provided with hardwire interlocking in addition to the
interlocks through PLC .
- The Tenderer shall include multi-vendor connectivity with
all requisite hardware , communication interfaces &
required software for exchange of signals with other PLCs
of different make on high speed communication bus.
- OPC server shall be provided for communication between
the OEM PLC (of different make) and main system PLC .
3.0 Operational control - Provision of the visualisation of the system shall be
mechanism through human-machine interface HMI , for the control
and operation of the complete plant .
- In addition to the normal workstations, at least two
numbers of 42” or higher plasma/LCD display units and
one overhead LCD projection system to be provided in
each central control room.
- Plasma/LCD display units along with AV switching unit to
output AV signal from any machine in the control room
4.0 Operational The Graphic interface to the operator shall have the following
facilities in HMI minimum features with user friendly navigation keys .
• It shall be possible to display dynamic graphic of different
section of plant on the TFT screen & large display system
.
• Graphic displays shall be field configurable only through
engineering key-board with standard / user defined
graphic symbols.
• Different plant sections dynamics shall be displayed on
different pages.
• The graphic display on the HMI clients shall also include
extensive process, system and equipment diagnostics in
graphical form for troubleshooting. The PID and other
such settings to be available on operator workstation for
viewing and editing.
• Graphic display shall be interactive type through which it
shall be possible to control process. Following process
control functions will be initiated via the HMI :-
- Operation mode (Auto / Remote / Manual ) selection
- Control mode (Auto / Semi-Auto / Local ) selection .
- Selection of drive and control loops
- Set point selection.
- It shall also be possible to send motor start / stop
and shutdown, valve open / close command , control
mode selection command from this display.
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- It shall be possible to go from any graphic page to
related graphic page or any group view or alarm
summary in single keystroke using soft key function.
- Process diagnostic system to provide status & fault
signals of the process along with process error
displays.
- The details of graphic screens shall be finalised as
required during detailed engineering and
commissioning.
5.0 Operational menus • Opening page with project description, name of supplier,
in HMI name of consultant .
• Sub-menus like command menu, report menu etc.
• Command menu in the form of buttons for start and stop
of each equipment / group of equipment .
• Operation mode
• Display of auto / local selection of each mechanism .
6.0 Reporting and data • Summary of faults with description, date and time of
logging occurrence .
• Shift wise, daily, monthly, yearly hierarchical logging of
report/faults/data with process values / production figures
and other process data. However, same shall be finalised
by the Purchaser during detailed engineering process.
• Automatic log sheet – operation & maintenance – shift &
day.
• The system shall comprise of a standard library of control,
logic and computational functions that are
preprogrammed and stored in memory. During the
system configuration, user shall be able to select the
appropriate functional blocks from the library, link them
together, set the various inputs and tune parameters
associated with each block.
• Real time recording of data for important equipment shall
be provided (e.g high speed recorders etc.)
• All logging in ORDBMS. Logging and reporting also to be
provided batch-wise, campaign-wise, etc. Reporting to
include analysis tools.
• Historical data storage & trending.
• Along with graphic generation, trending, and alarm
generation, EVENT LOGGING also to be included. Event
logging means data related to an event happening in the
process or field. It will also include the user activities vis-
à-vis operation through the automation system.
7.0 Mode of operation A Local Mode :-
of the plant • Operation of single drive / equipment
• Start / Stop from LCS shall be done only for test and
repair purposes .
• To enable the testing of individual equipment all the
interlocks which are not at all necessary shall be
withdrawn in this mode .
• However all personnel / equipment safety interlock
are effective for safety reasons also in local mode .
• LCS are provided for all motors , drives and
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actuators for valve operation as near as possible .
B. Semi Auto :-
• Under this mode it shall be possible to monitor &
control the plant based on set points / commands
given by operator through keyboard (for individual
equipments or individual group for group control
drives) and the control, sequential operation of
various mechanisms in the required sequence shall
be executed by PLC i.e.; in this case all the changes
are operator initiated.
C. Auto Mode :-
• This is the normal mode of operation of the plant . In
this mode , the desired values (set point) of the
parameters of process control loop will be set via
keyboard of the HMI and sequencing and logic
functions will remain operative through the PLC as
per programme.
• There shall be a provision of group start of the
individual sections .
• In the individual sections there shall be provision of
interlocks , logic and sequencing between the
individual drives
9.0 Process graphic • Process status overview (On/Off status of process and
displays with plant)
dynamic process • Operation status of Drives (Position and status of drives)
variables • Group display of Loops
• Control Loop display & Configuration of Control Loops
• Real time trending (Bar graph displays and / or
numerical display)
• Historical trending. Historical trending for 7 days for 1
minute scan rate for all analog inputs
• Fault message indications
• Operational/ event message indication.
• Data and time synchronization on the complete HMI
system shall be ensured .
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• High speed (1msec scan) recorder of 12 channels to be
provided for real time recording of data for important
equipment (at least 02 nos. for each packages) .
10.0 Process graphic • Graphic Display will contain static and dynamic
display operation components. The dynamic components display the
actual state of the plant section. Dynamic components
will be actual binary states (e.g. drive “on”) or actual
values . Values will be represented as bar charts and /
or numerical.
• Critical plant status will be highlighted by different
colours or by blinking. Description in clear text will be
provided to simplify Operator understanding.
• Double clicking on any of the control valve in any of the
menu / submenu pages shall invoke the corresponding
PID loop display screen with real time trend. PID loop
display screen shall show controller facia and displaying
status and parameters of each controller. Each facia
shall be able to display process value, set value and the
manipulated variable. The remote manual functions and
change of set points under auto mode shall be possible
to be performed from these facias.
• Graphics should also include very comprehensive
diagnostics on process, plant, equipment, system etc.,
enabling the user to pinpoint exact reason of any
problem faced.
• In case of Cascade/ Ratio control, it shall show all the
controllers facia with the facility of maximising one of
them. PID parameters can be changed only after
validation of software password.
• Clicking on any mechanism like valve will invoke a
small screen showing following (software lamps)
indications for remote manual operation :
o Local
o Remote
o Auto
o Open (Blinking with opening color during opening )
o Closed (Blinking with closing color during closing )
o O/L Tripped
o Torque switch actuated
o Control supply Healthy
o Valve Open Timer Time Out
o Valve Close Timer Time Out
o Local Stop
• Clicking on any mechanism like fan / pumps will invoke a
small screen showing following (software LED)
indications for remote manual operation:
o Local
o Remote
o Auto
o Run Feed-back
o Elect. Fault
11.0 Colour Codes • The display of the process will occur on full graphic color
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process terminals.
• In Graphic display sheets color of the process line shall
be as per the color code followed by the Purchaser.
• However all fans / pumps color will be RED in ON
condition, color will be GREEN in OFF condition and
valves will be PINK (with blinking) in the intermediate
position.
• Client approved standard color-coding to be followed for
graphics.
• Uniform color-coding to be followed for cabling, TB, etc.
12.0 Trending In any menu/ sub menu page double clicking on any tag
will invoke the trend menu of that particular tag. Based
on the selection by the Operator either Historical or Real
Time Trend menu will be displayed. Provision shall be
there so that Operator can add trends by entering the tag
nos. , for another 7 nos. of tags in the same page ,using
the same time base for comparison purpose.
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• Operator scalable X-axis from 8 hours to one
month (for one month history, trend shall be
stored as 10 minutes average value for each
variable).
• XY Plots also to be included. Storage frequency,
maintenance, sizing, etc. to be done in
consultation with client.
• Current of all motors to be available on L-1
automation system for monitoring /trending etc for
all process related drives.
13.0 Interlocking The interlock scheme shall be as per the technological
requirement based on process flow diagram , P&I diagram
and functional chart .
• All emergency conditions like stop push button,
emergency stop command, torque switches , level
switches etc. shall be interlocked to the main power
contactors of the drives.
• Provision of providing interlocking of different equipment
(which are controlled from different PLC) based on I/O
exchange from that PLC .
• Further the system shall be provided with pre-starting
audio-visual alarm at equipment platform before starting
of mobile equipments like conveyors , turret , tundish
cars etc
• Interfacing with subsystems : All outside auxiliaries and
supporting units for process related system shall be
interfaced.
However, all facilities to be provided in the central control
room which shall be finalised during detailed engineering
stage keeping in view the process / technological
requirement.
14.0 Alarms and alarm • The use of multi-media system in HMI shall be
management envisaged for audio-visual signaling for faults & alarms.
• There shall be dedicated key as a provision for
acknowledging the faults. The usability of the operator
interface shall be further enhanced with features such as
sound cards, touch screen, track balls etc.
• Alarm list / event list and operator action list and its
logging for minimum one month .
• Alarm Performance
• Irrespective of Operator activity and choice of display, an
alarm situation shall always have priority and shall be
brought to the attention of the Operator, quickly and
automatically.
• The display containing the alarm shall be selected by a
single keystroke action. Alarms should automatically
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update in the event of an alarm operating i.e. it should
not require operator intervention to update alarms either
on process mimics or alarm summary format.
• Alarm messages shall be time tagged to within 100
milliseconds (from detection at input card or receipt from
data link) or less and are required to be displayed within
two seconds of the field device operating. System
resolution for the orderly detection of successive alarms
shall enable those alarms to be displayed in order of
occurrence, and/or priority.
• In order to facilitate easy recognition of alarm status by
operators, annunciator colours and audio tones shall be
easily distinguishable. All alarms and trips shall be
annunciated by a screen message and an audible alarm.
• Critical process alarms shall come in the form of small
size popup window on the HMI screen . Individual area
wise alarm shall display in the corresponding HMI
station.
• The alarms and trips shall flash in a highlighted form
(e.g. reverse video) until acknowledged. When
acknowledged from any HMI, the flashing and audible
tone shall stop on all HMIs. When an alarm returns to
normal, flashing shall return to normal on all HMIs
provided the alarm has been acknowledged.
• Alarm Category Colours
• The following colours shall be used for the process
control system screen alarms, on a black of gray
background:
• Fire & Gas : Red
• ESD : Magenta
• Fault alarm : White
• Process alarm : Orange
• These are proprietary colours and shall be confirmed
during detailed engineering. The use of yellow colour
(traditionally a gas alarm) and green colour (associated
with normal conditions) shall be avoided for alarms.
• Audible Alarm Category
• There shall be audible differentiation between the fire
and gas alarms (noise X), and process alarms and faults
(noise Y and Z), where X, Y and Z noises have to be
defined.
• Analogue Alarms
• All process variables and composed points shall have
the possibility of being assigned at least two levels of
high and two levels of low alarm values. All control loops
shall have the possibility of being assigned high and low
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deviation alarm values. All alarms shall have a user-
definable dead band. An alarm shall be provided when
analogue signals are less than 3.8 mA or greater than
20.2 mA. Rate of change alarms and set point deviation
alarms shall be provided.
• Filtering based on plant, equipment, time-span etc. shall
be possible
• The system will be engineered such that it is anticipated
that at least 4 levels of alarm priority will be used:
o Low
o Medium
o High
o Critical
• According to guidelines, which will be developed in detail
engineering, the Alarm/ event logging facilities will be
provided using Automation System based logging rather
than printers.
• Discrete Alarms
o All discrete inputs shall have the possibility of being
assigned a change of state alarm. Discrepancy
alarm indicating failure of control action shall be
provided.
• Alarm Analysis
o It shall be possible to inhibit alarms by point of priority
when the initiating device is faulty or being
maintained. While inhibited, the point must still be
scanned and archived. The removal of the inhibit
shall be logged. A summary display containing all
inhibited points shall be provided on demand. Alarm
inhibition shall be permitted from any of the work
stations with level 3 or 4 access level only. Facilities
shall be provided to mask out alarms from equipment
(such as pumps) that is shutdown. These alarms
shall be automatically or manually via keyboard,
reinstated when the equipment is put back into
service. Initiation and removal of inhibition shall be
logged as an event and printed.
• Alarm Display
o Alarm displays shall take the form of a summary
display of all points in alarm, and/or integrate the
alarm message with associated item, group or
overview data. Alarms shall be listed in order of
occurrence, and for specific alarm displays the most
recent alarm shall be shown at the top of the display.
All alarms shall be identified by tag, description and
the date and time of the occurrence, in hours,
minutes and seconds. A banner type display
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showing a summary of alarms shall always be
present at the top of the screen irrespective of main
display.
• Alarm Grouping and Priority
o Alarms from an area shall be capable of being
grouped in one or more Alarm Groups. A minimum
of 30 Alarm Groups shall be provided. At least four
levels of alarm priority shall be available, with
configurable presentation/ background colour. A
global alarm acknowledge and reset facility shall be
available. If unacknowledged, Alarm message stays
on display until it is cleared.
• Diagnostic Alarms
o The Automation System shall have a comprehensive
self-diagnostic alarm information shall identify the
faulty device down to board level, with its location
and provide a diagnostic code. Individual circuit
boards shall be provided with LED indicators or
equivalent, to positively identify a faulty board. The
failure of any single item of equipment shall not
generate erroneous alarms.
• Alarm Handling Capacity
o In addition to the alarms included in the point count,
the Automation System shall be capable of handling
alarms and status points received via any data link
to which it is connected.
• Alarm Flooding
o The Tenderer shall outline his approach, to over
come the problem of alarm flooding.
15.0 Configuration • For Instrumentation system a separate dedicated PLC
shall be provided (as mentioned in TS) .
• If the PLC is common for the process a separate
dedicated remote I/O panel shall be provided for the
instrumentation system .
General Features
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auxiliary power supply e.g fans , panel lamps , power
sockets etc.
- Both UPS power supply units shall have auto changeover
facility as well as manual changeover facility through
selector switch .
- Redundant 24 V DC regulated power supply unit shall be
provided for interrogation voltage and output voltage .
- Separate power supply bus shall be provided for
interrogation voltage supply for all inputs and output
respectively (even if the input interrogation voltage and
output voltage is same)
- Power supply unit shall be provided with diode multipliers
for input interrogation & output voltage for driving outputs
(interposing relays, solenoid valves ,lamps etc.).
- DP MCBs shall be provided for each rack of the PLC
system .
- 20 % spare DP MCB shall be provided in each panel .
1.02 Built-in power - Suitable for the power supply system as specified above.
supply units - Following power supply unit shall be provided for following
units :
• Redundant 24 V DC power supply units (with multiplying
diodes for powering field instruments (2-wire
transmitters).
• Separate power supply modules, to be supplied by the
Tenderer for each segment of Foundation Field bus
system, shall be of Type 132: Non-I.S. power supply
intended for feeding a non-I.S. barrier. Output voltage
shall be 32 V DC maximum. Power supply module shall
have in-built power conditioner. DP MCBs shall be
provided for each segment of the Foundation Field bus
system.
- Redundant regulated power supply unit of proper rating
shall be provided for special control module ( if any
required).
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appropriate communication module).
- The CPU system shall have facility of bumpless transfer
in case of failure of one .
- CPU shall have crystal clock generator .
- Redundant CPUs to have extensive in-scan
synchronization. Time synchronization from designated
time server
- Peer to peer communication through I/O channels shall
be possible .
- Backup system communication (redundant
communication bus) shall be provided.
- The processor shall have proper communication
modules (for each CPU) for communicating with
redundant processor , remote I/O modules and for
communicating with other communication bus protocols
like ethernet bus / profibus / modbus / controlnet / field
foundation bus etc. (no proprietary bus, for any sort of
communication including fieldbus, to be used.
- The processor shall have in-built provision for software
timers , counters , examining input conditions, compare,
compute, logical, conversion from/ to BCD, bit
manipulation, block memory manipulation, diagnostic,
shift, sequencing, conditional jumping, subroutine
instructions etc.
- CPU shall be capable of handling PID functions including
mathematical functions ,weighing and batching functions.
- CPU shall be capable of handling 30 % additional (future)
I/Os over and above 20 % spares (installed) I/Os
indicated in basic configuration diagram. Maximum CPU
loading shall be limited to 60 % for the intended
applications.
- The CPU shall have the facility of initializing a
synchronizing pulse to the server periodically (Minimum
once in a day).
- CPU loading shall not exceed 60% .
3.0 Timers The timers shall be OFF delay, ON delay ,retentive type timer
with a range from few millisecond to few hours .Accuracy
shall be +/- 0.1% of the set value .
4.0 Counters The counters shall be of counter up and counter down type .
It shall have the range from 0000-9999 .
5.0 Memory units - Modular and plug-in type
- Word length 32 bit
- Expandable in blocks of 4K Words
- Minimum size 20MB .
- EPROM/ RAM with battery power back-up
- Back-up battery shall be as follows :-
• Rechargeable Ni-Cd batteries with necessary charging
circuit / Lithium or any other internationally acceptable
type.
• Able to retain memory for a minimum of 1 year with no
power applied to the controller.
6.0 Input Units - High density, modular, rack based (channel based I/O
not acceptable) and plug-in type.
- Insulation level of 1.5 KV
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- Input interrogation voltage 24 V DC.
- Individual fuse for each unit shall be provided for
protection against cable fault/earth fault .
- For critical applications all inputs (analog, digital, others)
to have individually isolated channels.
6.1 Digital Input Digital input units shall have the following features :-
Modules • 16 / 32 inputs per module.
• Time delay of about 10 millisecond to filter out noise
and contact bounce .
• Optocoupler to galvanically isolate each input device
from the decision making logic of the controller
• LED status indication
• BCD input units suitable for four digit input
• Pulse inputs ( Incremental encoder / digital tacho )
• Absolute / incremental encoder inputs.
• High speed counter type inputs
• All the cards shall be compatible of receiving digital
signals from field sensors and switches directly .
• All the control modules / cards shall be lacqured .
6.2 Analog input Analog input units shall have the following features:
Modules • Shall be 8 channels, rack based & plug–in type..
• Suitable for 4-20 mA / 0-10V DC / RTD /
thermocouple / weighing signal inputs.
• With necessary A/D converter having at least 12 /
14 bit resolution based on application.
• Suitable for J/K/S type thermocouples & for PT100,
2- wire / 3 wire
• Galvanically isolated differential inputs with insulation
level of 1.5 kV.
• For 4 – 20 mA analog inputs, fused TB with blowing
fuse shall be provided.
• Healthiness of every input shall be monitored & LED
indication shall be provided.
• Analog module shall have the facility to be
configured in voltage or current mode and differential
or single ended inputs mode .
• Pulse/ frequency input module shall have range upto
50 kHz. For very high frequency applications, the
range shall be upto 1 MHz.
• All the cards shall be compatible of receiving analog
signals from field sensors and switches directly . If
not suitable converters shall be provided .
7.0 Output units - High density, modular, rack based (channel based I/O
not acceptable) and plug-in type.
- Insulation level of 1.5 KV
- Individual fuse for each unit shall be provided for
protection against cable fault/earth fault.
- For critical applications all outputs (analog, digital, others)
to have individually isolated channels.
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7.1 Digital Output Digital output units shall have the following features:
modules • 16 / 32 digital outputs per module .
• High Density modular and plug-in type .
• Isolated outputs with two separate terminals for each
outputs .
• Rated for 24 V DC
• With insulation level of 1.5 KV
• The output module shall be able to drive interposing
relays (24V DC coil), solenoids, annunciation lamps,
LEDs, Instrumentation control equipments etc.
• Power devices like contactors etc. shall be actuated
through interposing relays. The interposing relays
shall be mounted in the same panel. Proper surge
suppressor shall be mounted across the coil of the
output relays. However as far as possible interposing
relays to be avoided.
• Any special requirement e.g position control to
control field devices shall be met by using separate
interface modules.
7.2 Analog output Analog outputs shall have the following features:
modules • Shall be of 4 / 8 analog output channels .
• Suitable for 4-20 mA / 0-10V DC / +/-10V DC outputs
• With necessary D/A converters having 12 bit
resolution
• With insulation level of 1.5 KV
• Each output shall be galvanically isolated.
8.0 Foundation Field • The Foundation Field bus interface modules (FIM) of the
Bus Interface PLCs shall be chasis based modules. These modules
modules (FIM) shall completely integrate Foundation Field bus devices
with the PLC controller & HMI software. These FIM
modules shall deliver system wide integration of data
access, control, connections, diagnostics and alarms
with the PLC system. LED indication of power, error
condition & status shall be provided in each FIM module.
• PLC shall provide graphical support to the Field Bus
Interface module to perform the functions of Link Active
bus scheduler for a network. This will allow the system
configuration engineer to see what’s going on and shall
provide complete flexibility to adjust schedules based
upon the needs of the control scheme. PLC shall also
support Back-up Link active scheduler.
• All Foundation Field bus (FF) devices (to be procured
under separate Instrumentation package) shall be
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registered with the Field bus Foundation at level ITK 4.0
or higher. Field bus interface modules & Field Bus
Library manager shall be compatible with ITK 4.0 or
higher version compliant devices. Tenderer shall also
provide Field bus usage license. All FF devices provided
shall be polarity insensitive. All FF cables shall be of
Type A.
• The PLC offered shall be certified for the Foundation
Field bus Host Inter operability Support Testing (HIST)
from Foundation Field bus organisation. HIST
procedures provide a common methodology for
assessing host inter-operability with registered devices.
• PLC Software shall have the capability either to directly
read Device description (DD), files from the Field bus
devices and add these DDs/ Files to the library for Off-
line & On-line configuration, or it shall perform this task
through a separate software tool, Field bus library
manager. It shall be possible for PLC based automation
system to upload field device configuration changes
implemented in the field. Once the configuration
information is stored in the automation system, it shall be
possible to download it to any other similar device,
whether a new or replacement device.
• In case of a new device added to a Foundation Field bus
segment, its presence shall be immediately shown in that
segment. Important information about the new device
including tag name, address, model and revision shall be
immediately available.
• Downloading new software to Foundation Field bus
devices shall be possible from the PLC. There shall be
no need to physically change the firmware and to
disconnect or remove devices for updating to the latest
available revision. It shall be possible to simultaneously
download the latest firmware to multiple field devices.
• Each Foundation Field Bus interface module shall
support minimum two segments.
• The Terminators shall be impedance matching modules
to be used at or near each end of a segment. There shall
be two terminators per segment. The terminators
prevent distortion and signal loss and shall be supplied
as a pre- assembled, sealed module. Tenderer shall
provide the Terminators as per the requirement.
• The power for each Foundation Field bus segment shall
be provided through a power conditioner to prevent the
communication signal from being attenuated by the
power supply & to eliminate cross talk between FF
segments through a common power supply.
• Power supply modules to be supplied by the Tenderer
shall be of Type 132: Non-I.S. power supply intended for
feeding a non-I.S. barrier. Output voltage shall be 32 V
DC maximum.
• For Field bus use, a power supply impedance matching
network shall be provided. This shall be a resistive/
inductive network and built into the Field bus power
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supply module.
• Connectors as coupling devices shall be employed to
connect the wire medium to a field bus device or to
another section of wire. Standard field bus connectors
shall be used. Specification shall be as per annexure A
of the ISA physical layer standard and annexure A of the
IEC physical layer standard.
• Couplers shall be the physical interface between
segment and spur or segment and Field bus device.
Field bus couplers shall be as specified in the IEC/ ISA
physical layer standard and provide one or several points
of connection to a field bus segment.
• Grounding: The instrument signal conductors shall not
be used as a ground. Instrument safety ground shall be
made through a separate conductor outside of the signal
cable. The conductor may be in the same cable as the
instrument signal conductors and shield, but shall be
located outside the shield within this cable. Field bus
devices shall not connect either conductor of the twisted
pair to ground at any point in the network. The Field bus
signals are applied & preserved differentially throughout
the network. Network cable shield shall be earthed/
grounded in one location only, at the field termination
assembly (Host) end. At any field instrument, cable
shield shall not be connected to the instrument earth/
ground or chassis. The cable shields from different
networks shall not be attached together in a field junction
box. This will create ground loop & noise onto the
network.
• Lightning/ Surge protection: Surge protection shall be
provided for all field devices. The surge protection shall
consist of low capacitance silicon avalanche diodes or
spark gaps, wired for both normal & common mode
protection and connected to the electrical safety ground
grid. Surge suppressors shall be so selected that they
shall not measurably attenuate the FF signal. To avoid
any chance of short circuit, surge suppression devices
shall be connected through a series fuse.
# NN MM P
• #: Indicates the plant/area number to which the segment
shall be connected.
• NN: Indicates the node number / controller name.
• MM: Indicates model number/ card number.
• P: Indicates segment or port number.
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Spur Naming convention :-
All spurs shall be labeled with Instrument tag name.
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- 01 number each of DI+DO cards per each PLC shall be
provided as spare .
Spare capacity of the spares mentioned above shall be
applicable at the time of handing over of the plant .
11.0 Self diagnostic - Parity errors, cycle errors and under voltage
features - Failure in central processor unit, memory and power
supply.
- Indication of type of failure
- Automatic turning OFF of all outputs or optionally holding
of all outputs in their last state on failure detection.
- Fault detection upto card level .
- Communication failures – all types
- Fuse failure indication for outputs
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- Dust and vermin proof
- Anti vibration pads to be provided to withstand vibrations
as per application.
- All modules plug-in type.
- Panel illumination with door interlock limit switch.
- Switch-socket outlet for maintenance.
- Suitable fans & inlet air filters shall be provided at the
bottom/ top of each panel for proper air circulation.
- Empty slots of the racks shall be provided with dummy
cards for protection against dust & damage.
- Colour shade outside and inside shall be RAL 7035.
- All panels shall be of Rittal make.
17.0 Data sheet to be Tenderer shall submit the data sheet of the PLC system .
furnished by the The following informations shall be at least mentioned in the
data sheet :
tenderer
• CPU processing speed
• I/O handling capacity
• CPU in built communication port
• CPU programming memory capacity
• Minimum scan time achievable
• CPU self and diagnostic features .
03. Human Machine Interface (HMI) Work Station & Engineering Station
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Type -Shall be console type PC based colour graphic Work
1.0 Station
- Commercial grade latest available in the market.
- Industrial grade latest available in the market (for
installations in the plant bay e.g. on casting platform in
MOP)
- In addition to the normal workstations, at least two
numbers of 42” or higher plasma/LCD display units and
one overhead LCD projection system to be provided in
each central control room.
2.0 Interfacing card / Proper interfacing card / module with related communication
module required protocol shall be installed in the programming unit so that it
can communicate with the network (i.e PLC processor ,
server , HMI , printers) smoothly
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provided for all analog inputs).
- Report generation and periodic logging.
- Developing of graphic symbol library as per
ISA – 5.1 and 5.3. in addition to standard industrial
symbols.
- Printing of alarm conditions with parameter identification.
- Online editing of :-
• Scan sequence
• Identification number
• Engineering units
• High and low alarm limits
• Alarm dead bands
• Addition / Deletion signals
• Removal / introduction of analog and digital points in
scanning.
04. Server :-
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2.0 Make - Servers shall be of COMPAQ/ DELL/ IBM make.
05. Software :-
1.0 PLC System software The PLC programming software shall be latest, Windows
(Windows based, menu driven and shall support the following minimum : -
Programming) - Cyclic, Time Controlled, Interrupt controls.
- Retentive / Non Retentive Timers, Bi- Directional counters,
latches, etc.,
- Internal Flag generated by the PLC.
- All Boolean Logic Functions
- Data Transfer, Block Transfer
- Sub Routines
- Arithmetic functions & formula Calculations
- Communication functions with Remote I/O as well as Work
stations
- Closed loop PID control functions including nested and
cascaded loops.
- Output of PID controllers shall be 4-20 mA DC.
- Control valve position (in 4 – 20 mA) shall be made
available in PLC.
- PID Controller shall have auto tuning facility
- Totalisation of flow inputs.
- Linearisation function blocks and other useful function
libraries
- Linearisation function block shall be such that a table of
values (X against Y) can be entered in a menu driven
manner and for any particular field input X, the value of Y
can be calculated using the values of table by interpolation
method. Maximum 30 point linearisation function block
shall be considered. Below 30, point of linearisation shall be
user selectable.
- Built-in ambient temperature compensation for
thermocouple inputs from field.
- Broken sensor detection etc.
- Simulation facility / software shall be supplied for
programme testing without disturbing the working PLC .
- Minimum no. of PID Control Loops: 40.
- The complete PID blocks shall be transferred to HMI work
station in place of split bits .
- All computer shall have anti – virus software.
The Software shall be suitable for PC based Programming Unit .
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2.0 Application - Shall be as per process control requirement.
Programme - The application programme software shall be written in
software Ladder logic / block diagrams / statement form.
- Online programme editing facility shall be available.
- Troubleshooting manual for all application software, system
software, configuration, hardware, network, etc. to be
provided, spelling out possible causes, checks and
measures for corrective action.
3.0 HMI software - Window based, latest version (at the time of
implementation) of HMI software.
- HMI software package shall have the facility to perform
multitasking, data acquisition, supervisory control,
monitoring, control development and routine software.
- HMI software shall also have the features for alarming,
trending, data logging, production backup history, operator
action list , creation of shift reports after every shift, online
printing of events.
- Number of graphic pages shall not be a limit .
- HMI software shall have the facility of handling unlimited
tags (Digital as well as analog).
- HMI software shall be capable of curve fitting, co-relation &
regression functions.
- In the engineering workstation & servers, development
version of HMI software & Foundation Field bus system
software (licensed versions) shall be provided.
- In the operator workstations, runtime version of HMI
software & Foundation field bus system software (licensed
versions) shall be provided.
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Test equipments, tools, software, etc. for all relevant hardware and/or software
systems/subsystems shall be provided .
Special tools to include tools in sufficient number for tracing, location, testing, jointing, fault
location & rectification, termination etc. for all cables including special cables (network and
FO cables) in all major units of the expansion projects.
Tenderer shall indicate the list of special tools and tackles .
07. Documentation :
All drawings, designs, configurations, software, numbers, models etc. listed in TS and
GTS are indicative and minimum only. Bidder may suggest a better and more
comprehensive solution.
08. Standardization :
09. Training :
All the shops shall have a conference room in the new welfare building . Following
gadgets shall be provided in the conference room by the tenderer :-
• In conference room, ceiling mounted projector with automatic screen and good
quality music system, also to be included. Projector and music system also to be
interfaced thru AV switching unit to all the computers in the room.
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1.02.16 Large Screen Display System :-
Large screen display screen system shall be provided in the control room of the plant .
The display system shall have linear setup in the control room .
The display system shall consist of a matrix of rear projection modules for high overall
resolution, a controller unit based on either MS-Windows or Linux , and optional wall
management software. Rear projection modules shall have DLP (Digital Light
Processing) technology .
Size of the display system shall be 5m (length) x 3 m (width) . Distance from the screen
to operator shall be minimum 5 metres . The cube configuration shall be considered
based on the above size of the screen . The display unit shall have following features :
• Full viewing angle : 180 degrees .
• Half gain angle(Horz. / vertical) : 35 deg. / 35 deg.
• Seam size screen : less than 0.2 mm
• Aspect ratio : 4 : 3
Operating condition :
• Humidity : upto 90 % non condensing
• Temperature : upto 50 deg. C.
• Optical dimming with dynamic feedback : Yes
• Power supply :- 240 V AC , 50 Hz.
• EBU Colour triangle
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• Inputs : Shall have all options of multi input module: DVI-D, DVI-I, Multi Sync RGB
input (VGA upto UXGA), Video Input (PAL, NTSC, SECAM)
Projection unit shall have : -
• Single chip DLP technology .
• High resolution
• High contrast .
• Egronomic luminance
• Integrated optical dimmer
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In addition to static bypass switch , a manual
changeover switch (MCCB) of adequate rating
shall be provided to supply the load directly
(bypassing the rectifier/charger, inverter, and
static transfer switch) from the mains instead of
through the UPS system .
(viii) Maintenance bypass Maintenance bypass shall be provided in parallel
to the static bypass line with an isolation device .
The contacts of the isolation device shall be of
“make before break’ type .
(ix) Battery bank • Sealed maintenance free (SMF) batteries
shall be provided for the battery bank .
• The batteries shall be housed in a separate
battery cabinet located adjacent to the UPS
panel.
• The battery power pack shall include SMF
battery housed in a separate cabinet . Battery
cells shall be mounted on slide-out trays for
ease of maintenance.
• A battery disconnect circuit breaker with
undervoltage release (UVR) shall be included
for isolation of the battery pack from the UPS
module.
• The UPS shall automatically be disconnected
from the battery by opening the breaker when
the battery reaches the minimum discharge
voltage level.
• Casters and leveling feet shall also be
provided with the battery power pack cabinet
for ease of installation.
• The battery bank shall be installed in separate
panel beside the UPS panel in the
airconditioned environment located in the
control room itself .
(x) Battery backup Battery shall be suitable to maintain the power
supply for at least 30 minutes (throughout the total
duration) in the event of mains failure with rated
capacity of the UPS at full load
(xi) Battery management UPS shall have latest ‘Battery Management
system System’ to charge / discharge the entire battery
automatically
(xii) UPS management UPS shall have latest ‘UPS Management System’
to load / unload the UPS automatically .
(xiii) AC DB Necessary distribution board for distribution of
power from UPS output to individual consumers
(xiv) Loading capability UPS shall be capable of taking 100 % non linear
loads
(xv) Interchangeability of sub The UPS shall be constructed of replaceable
assemblies subassemblies. PCB's shall be plug-in type . Like
assemblies and like components shall be
interchangeable
(xvi) Noise level Maximum noise level shall be less than 60 dB at
a distance of 1 m from the body of the UPS
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(xvii) Efficiency The efficiency values of UPS under 50%
unbalanced load & 100 % linear loads shall be as
near as possible to normal efficiency
(xviii) Isolation transformer The isolation transformer shall be of dry type and
shall be provided on both input side , output side
and static bypass side of the UPS
(xix) Grounding • The AC output neutral shall be electrically
isolated from the UPS chassis.
• The UPS chassis shall have an equipment
ground terminal. Provisions for local bonding
shall be provided.
• Component mounted doors shall be seperately
earthed through 2.5 sq.mm PVC insulated
green/green-yellow color flexible copper wire .
(xx) Communication port The UPS shall have inbuilt RS 485 port for display
of online status of UPS on HMI .
3.0 Rectifier • Dual rectifier with each unit rated for supplying
both inverter load and battery charger load in
different modes.
• Rectifier unit shall consist of minimum six pulse
bridge connection .
• Active front end rectifier set to reduce the
harmonic distortion .
• With necessary smoothing reactor and filters
• Automatic boost and float charging control.
• Equalizing mode for compensating the charge
lost by the battery after a discharge automatic
changeover from equalizing mode to float
mode and vice-versa .
4.0 Protective features • Maximum current limiting .
• Automatic reduction of current limit in the event
of cooling fan failure .
• Boost charging and float charging current
limiting
• Surge suppressor in output side of the UPS .
5.0 Inverter • With input circuit consisting of battery
contactor, battery filter and smoothing reactor .
• DC/AC converter for voltage control .
• Inverter proper and control electronics .
• Series reactor and parallel filter .
• Output transformer
6.0 Protection • Abnormal output voltage (over voltage & under
voltage) .
• Abnormal link voltage .
• Over current on output .
• Over current on input or commutating failure .
• Low battery voltage .
• High transformer temperature .
• Auxiliary supply failure .
• Fan failure
• Logic failure
• Clock failure
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• Fast acting HRC fuse for inverter circuit and
control circuit
• Reverse power protection for parallel inverters .
7.0 Static by-pass switch • Static switch automatically switches the load to
the reserve power supply for the mains
whenever there is failure in inverter supply to
the load .
• Fast acting inverter contactor shall connect the
inverter output to the load.
• High speed fuses shall be provided for
protecting the thyristor against accidental
overload.
8.0 Indicating meters to be • Input voltmeter with selector switches .
provided on the ACDB • Input ammeter with selector switches
panel • DC voltmeter with selector switches
• Centre zero type DC ammeter for
measurement of charging/discharging current
from the battery .
Digital type meters shall be provided for the
following :
• AC output voltmeter with selector switch
• Separate frequency meter to see Input and
Output frequency .
• AC output ammeter with selector switch
• AC voltmeter with selector switch for bypass
circuit .
• AC ammeter with selector switch for bypass
circuit .
• Frequency meter for bypass circuit .
9.0 MIMIC on UPS panels • MIMIC of the system power flow diagram as
single-line diagram of the UPS shall be
provided on UPS panels front door with long-
life LED's integrated within the single line
diagram to indicate the operating status of
different components/sections of the UPS.
10.0 Display and Operating • The UPS shall be provided with a
system microprocessor based keypad and display unit
mounted on UPS panels front door for
operating and viewing the UPS status for
convenient and reliable user operation .
• The monitoring functions such as metering,
status and alarms shall be displayed on an
alphanumeric LCD display.
Additional features of the monitoring system shall
include:
• Menu-driven display with text format
• Real time clock (time and date)
• Alarm history with time and date stamp
(minimum upto 16 faults in memory with FIFO
sequence)
• Battery back-up memory / condenser charged
back up memory .
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11 Metering The following parameters shall be displayed:
• Input AC voltage line-to-line and line-to-neutral
for each phase .
• Input AC current for each phase
• Input frequency
• Battery voltage status
• Battery charge/discharge current
• Output AC voltage
• Output AC current
• Output frequency
• Percent of rated load being supplied by the
UPS
• Battery time left during battery operation .
12 Alarm Messages • Input power out of tolerance
• Input phase rotation incorrect
• Incorrect input frequency
• Charger in reduced current mode
• Battery charger problem
• Battery failed test
• Low battery voltage warning or blown battery
fuse
• High battery voltage
• DC bus overvoltage
• Bypass frequency out of range
• Load transferred to bypass
• Excessive retransfers attempted
• Static switch failure
• UPS output not synchronized to input power
• Input power single phased
• Input voltage sensor failed
• Inverter leg overcurrent in X-phase
• Output undervoltage
• Output overvoltage
• Output overcurrent
• System output overloaded
• Load transferred to bypass due to overload
• Fan failure
• Overtemperature shutdown
• An audible alarm shall be provided and
activated by any of the above alarm conditions.
13 Status Messages • Normal operation
• Load on maintenance bypass
• Load on UPS
• Load on static bypass
• System shutdown
• UPS on battery
14 Controls • UPS start-up / shutdown shall be done by push
button / rotary control switch
• Normal operation / bypass operations shall be
done by a single rotary control switch.
• An advisory display and menu-driven user
prompts writeup sticker (pasted inside the
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panel door) shall be provided to guide the
operator through system operation without the
use of additional manuals.
• Pushbuttons shall be provided to display the
status of the UPS and to test and reset visual
and audible alarms.
15.0 Constructional features The UPS system shall consist of a dedicated
ACDB panel consisting of Incoming and Outgoing
terminal blocks, MCCB’s, power and auxiliary
contactors, isolation transformers.
(i) Isolation devices • MCCB (upto 630A) in incoming side
• TPN/SPN MCB (of adequate rating) in outgoing
side.
• Power circuit isolation device to have pad
locking in the OFF position with the door closed
(ii) Installation • Metal clad , indoor installation
(iii) Mounting • Floor mounting with base channel of ISMC-75
(iv) Enclosure protection • Totally enclosed dust and vermin proof.
• IP - 42
(v) UPS housing • Each UPS system shall be housed in a
separate cubicle, complete with an individual
front and back access door with concealed type
hinges.
• For UPS panel all the switches, indication
lamps and meters shall be flush mounted on
the respective compartment door.
• For ACDB panel the input MCCB’s and output
MCB’s shall be operated from outside the panel
door .
(vi) Back access • Each panel shall have a door on back side . All
the doors shall have neosprene gasket .
• Natural rubber gasket shall be provided
between adjacent panel doors and removal
covers .
(vii) Lifting hooks • Lifting hooks for each panel shall be provided
(viii) Designation plate for Inscription plate for each panel :-
UPS • Name plate shall be provided at top centre of
the UPS panel .
• Name plates will be of Anodised Aluminium
with white letters engraved on black
background and in English language.
• Letter height for UPS designation plate shall be
in the range of 25-50 mm .
• Individual components shall be identified with
identification plate and shall match with the
identification tags mentioned in the drawing .
• Danger board shall be provided on front and
rear side of the UPS both in Hindi , English
languages.
(ix) Thickness of sheet • Load bearing members : 2.0 mm
steel (CRCA) • Non load bearing member : 1.6 mm
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(x) Door earthing • Hinged door at front and back with flexible
earthing connection .
(xi) Cable entry • Incomer :- Bottom cable entry
• Outgoing :- Bottom cable entry
(xii) Gland plates • Undrilled removable bottom gland plates
( 3 mm thick)
(xiii) Output power • Auxiliary contactors shall be provided in output
indication side of the UPS for potential free contacts for
indication of UPS and non UPS power supply
at different location .
• Proper transducers shall be provided for
voltage and frequency indication at different
locations .
(xiv) Cooling of panels • Panels shall have fan installed vertically at top
for forced air draft and louvers with screen
protection in bottom .
• Fans shall be powered from input supply of the
UPS . Low velocity fans shall be used to
minimize audible noise output .
• The thermal design, along with all thermal and
ambient sensors, shall be coordinated with the
protective devices before excessive component
or internal cabinet temperatures are exceeded.
• The UPS shall be installed in air conditioned
environment.
(xv) Bolts , nuts & cable • All bolts and nuts for terminations shall be
glands cadmium coated .
• Double compression cable glands for receiving
external power & control cables.
• Compartment door interlocked with the
isolating device for safety with provision for
defeating it by authorised person
(xvi) Indicating lamps • All indicating lamps shall be of LED cluster high
density type.
(xvii) Finish • Interior and exterior :- RAL 7035
(xviii) Terminal block • Terminal block for incoming cable shall be
located in back side and outgoing cables shall
be in front side of the ACDB panel .
• All incoming terminal blocks shall be fully
insulated for the working voltage.
• The terminal blocks shall be sleeved color
coded Red , Yellow , Blue , Black for R,Y,B,N
respectively using heat shrinkable PVC sleeve .
• All outgoing terminal blocks shall be sleeved
color coded Red and Black for line and phase
respectively using heat shrinkable PVC sleeve .
• Colour coding shall be provided for TB’s and
wires for different voltages level .
• All the terminal blocks shall be shrouded .
• Not more than two connections shall be made
at one terminal.
• Terminal blocks shall be suitable to connect
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two cores of minimum 2.5 sq.mm .
• There shall be 20 % spare terminal blocks
(xx) Output power bus • The solid output power bus shall be of bare
copper with a minimum rating of 100 A at 240
V AC (1 pair).
(xxi) Earth bus • The main earth bus shall be of 50 x10 mm GI
with extension at both ends of switchboard for
connection to safety grounding network . Earth
busbar shall run continuous throughout the
UPS panel at bottom .
(xxii) Panel internal wiring The panel internal wiring shall be carried out by
1100 V grade , single core , black color PVC
insulated , stranded copper wire of following size
• Current transformer circuit :- 4.0 sq.mm
• Control and potential circuit :- 2.5 sq.mm
• Identification of wire shall be numbered by
plastic/ ceramic ferrules.
• Ferrules shall be self locking type.
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1.02.18 Electronic Weighing System
This section covers electrics for belt weigh feeders, loss in weigh feeders, load cell
based bunker level measuring system & belt weigh scales.
1.1 Microprocessor based Individual Weighing Controller (IWCs) with digital display and
keyboards – for Belt weigh feeders/ Loss in weigh feeders
1.2 VFD drive for speed control of AC motors of belt weigh feeders with necessary
switchgears, incoming choke, output reactors if required, protective devices,
communication links with IWC, input/output for remote start/stop, interlocking,
indication lamps, controls, metering, potential free contacts for remote status indication
like ON/OFF/TRIP/ converter fault (to be wired to PLCs), motor protective devices at
field etc. Technical features of VFD drive shall be as per General specification for
electrical system(GS-03).
1.3 Individual Belt Weigh feeder panels housing IWC (Intelligent weighing controllers)
controller & VFD drive, DOL starters for vibrating hoppers interlocked with belt weigh
feeders.
1.4 Microprocessor based Bin weight measuring panels with digital display and keyboards
with auto taring and auto calibration facility. Bin Measurement panels housing IWC
controller (IWC Controllers for mote than one Bin can be combined in one panel.
1.5 Beltweigh scale panels (if any as per Mechanical scope) housing microprocessor
based measuring indicator with digital display and keyboards with auto taring and auto
calibration facility.
Belt Weight feeder IWC, Bin weigh measuring controller & Belt Weigh Scale IWC shall
be able to communicate 100% with purchaser’s PLC/DCS on the plant communication
bus as selected (like Profibus DP) by Tenderer.
1.7 Load cells, techogenerators, field junction boxes, limit switches etc. for Belt weigh
feeders, Bin level measuring systems, Belt weigh scales (if any).
1.8 Common local control station for Belt weigh feeders & Vibrating hoppers (as
applicable) housing Local /Off/Auto selector switches, Start/stop push buttons, speed
increase/decrease, TPH indicators etc.
1.9 Local Indicator panels for Bin weighing control & Belt weigh scales (if any)
1.12 Supply of dummy load cells for various Bunkers (BLMS system)
1.13 Features for Belt slip detection in case of weigh feeders, like tail end tacho or other
suitable measures shall be provided by Tenderer.
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2.1 DESIGN BASIS FOR BELT WEIGH FEEDER/LOSS IN WEIGH FEEDER
The consistency of the feed rate shall be guaranteed within +/- 0.5% of the set value
within the operating range of 10% to 100% of rated capacity.
The weighing control shall be totally automatic with close loop control. The feed rates
of different materials shall be calculated by the computer and set points of Belt weigh
feeder shall be set by the computer through PLC. In case of computer failure manual
setting (remote manual) and operation of feeders shall be possible.
Load cell shall be globally reputed make, confirming to OIML/NTEP Standard and
preferably digital type, side mounted and easily replaceable type.
Weighing system shall be mounted in the horizontal portion of the conveyor with multi
idler/weigh carriage system.
Equipments shall be provided with anti sway, anti sagging and anti slip devices.
Auto zero track, annunciation and diagnostic facility shall be provided.
Surge, radiation, EMF & RF protection devices shall be provided.
Test weights for different range of calibration should be provided with each equipment.
Redundant electronics shall be provided.
Special tools & tackles shall be provided with the equipment. Such as HBM/Molen load
cell calibrator – 2 nos., Portable think Pad based software programmer – 2 nos.
Universal Source HP/Fluke – 2 nos. High precision Digital Multimeter minimum 4 ½
digit Philips/ HF/Fluke 2 nos. Professional Toolkit RS – 2 nos. Quard, Triple output DC
Power supply make ISO Tech – 2 nos. WMD1 Multi Digital Power Unit with Soldering
Station, make Weller – 2 nos. USB to 2xPS/2 Converter alongwith USB IrDA Infrared
Adaptor – 2 nos.
Two years maintenance spares shall be included.
Compress air and high pressure water injection facilities to be provided for cleaning of
weighing area.
Training on maintenance aspect is required for Inst. & Weighment personnel.
The IWCs for control of Belt weigh feeders/ LIWs shall be microprocessor based
having automatic weighing and calibration facilities. The system shall be complete with
protection against overloading. Accuracy of Belt weigh feeders shall be +/-0.5% or
better of preset feed rate.
It shall be possible to operate the Belt weigh feeders under the following modes:
Local - Volumetric
Local - Gravimetric
Remote - Gravimetric (remote manual/PLC automatic)
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Microprocessor shall be provided with each IWC as per standard design/ system requirement. IWC
shall generate signal for material feed rate in t/hours. The IWC shall compare the actual feed rate
with the set point feed rate and generate a suitable correction for the VVVF converter of belt drive.
The signal shall change the belt speed and accordingly provide the desired feed rate. It will be
complete with auto calibration, auto tare, auto belt slip/ drift monitoring facilities etc. The stored
values after calibration shall not change due to power failure.
Belt Weigh feeder panel housing above IWC & VFD drive shall also be provided with following
control equipment /facilities.
Following displays and messages shall be possible for all the operating and calibrating
functions:
- Set point.
- Normal/Maintenance/Calibration modes.
- Actual feed rate.
- Belt load (Platform load).
- Belt speed.
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- Totaliser value.
- Deviation error between set and actual feed rate.
- Service data such as measured value, controller output, control signal level etc.
- Event messages/fault messages.
The above shall be available on each IWC on digital display unit in central control room.
Display and messages listed above shall also be made available on VDU of PLC/DCS.
Equipment shall comply with statutory requirement of Weights & Measures Deptt. of Govt. of India.
Load cell shall be of globally reputed make, confirming to OIML/NTEP Standard & preferably digital
type. Load cell shall be easily replaceable type, provided with safely devices from impact load, vibration
and lifting arrangement facility. Lightning & Surge protection devices shall be provided in load cells,
JBs, electronics & main electrical power supply.
Load cells shall be of high precision strain gauge type, hermetically sealed, robust in design, shock proof
and insensitive to overload, temperature, vibration, electrical noise etc. Enclosure class shall be IP 67 /
IP 68 .
Load cell shall be provided with ambient temperature compensating device upto 55 deg. C.
Provision shall be kept to neutralise the error caused due to application of transverse forces.
Max. Measurement error permitted is +/- 1%
Weighing system shall be auto zero & auto calibration facilities.
Test weight for calibration shall be provided.
The weighing system shall be hooked up with customer host computer and shall support remote
monitoring on BSP’s Existing Plant Wide Network.
Bin level measurement system shall be microprocessor based having automatic weighing, taring and
necessary calibration facilities. The system shall be complete with protection against overloading.
Accuracy of weighing +/-0.1% or better.
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The controller shall have digital display and keyboards, indication, alarm, annunciation etc. It will be
complete with auto calibration, auto tare facilities etc. The stored values after calibration shall not
change due to power failure.
The controller shall be complete with built in power supply unit, CPU, program memory, A/D & D/A
converters, etc. The above will be of modular design using standard PCBs and connectors.
It should communicate actual weight/level, conditions for bin empty, level low, level high etc to
Automation system.
One no. large display unit for outdoor display shall be provided.
Compress air and high pressure water injection facilities to be provided in weighing area.
The IWPs for control of belt weigh scales shall be microprocessor based having automatic weighing and
necessary calibration facilities. The system shall be complete with protection against overloading.
Accuracy of belt weigh scale shall be +/-0.25% or better of flow rate.
Microprocessor as per standard design/ system requirement shall be provided each IWC. Microprocessor
shall multiply load cells and conveyor speed signal in digital form to generate signal for material
conveying rate in T/Hours. It will be complete with auto calibration, auto tare etc. The stored values after
calibration shall not change due to power failure.
The following displays and messages shall be available for all the operating and calibrating functions:
The above shall be available on each IWC on digital display unit. Display and messages listed above will
be made available on VDU of in central control room.
It will be of robust construction and designed to give guaranteed accuracy of feed rate. It shall generate
consistent output pulses of positive or negative polarity as applicable by accepting shaft rotation. The
output pulses shall be suitable for feeding into high impedance electronic circuit/instrument for digital
measurement and control. The enclosure class shall be IP 67. It will be provided with ambient
temperature compensating device.
Arrangement of mounting of techogenerators and its coupling with AC motor shall be decided
considering ease of maintenance.
6.0 LOCAL CONTROL BOX (LCB) FOR BELT WEIGH FEEDERS/LOSS IN WEIGH FEEDER &
LOCAL INDICATION BOXES FOR BLMS & BELT WEIGHERS.
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Each belt Belt weigh feeder/Loss in weigh feeder shall be supplied with a local box with following
features.
Each local indication box for BLMS/Weigh Scales shall have digital indication of Bunker level/feed rate.
- Load cell shall be imported reputed make as per OIML / NTEP standards with surge protection.
- Compression type suitable for weigh hoppers and material presence detectors on charging
conveyor.
- Enclosure class IP 67 / IP68
- Hermetically sealed, stainless steel precision strain gauge / digital type.
- Maximum usable load: 200%
- Destruction load: >500%
- 300% over load capacity.
- Suitable for maximum 70ºC.
- Temperature compensation range: - 40°C to 70°C
- Capacity of the Load cell for BLMS system shall be as per details given under mechanical part.
However, final rating of load cells shall have safety margin of minimum 150% of the rating
calculated.
- Load cell accuracy 0.04%
- Combined error: ± 0.03%
- Excitation: 10 to 50 V dc
- Zero balance: ± 1% of R.O.
- Insulation resistance: >5000M
- Complete with excitation source, transmitter, amplifier, junction boxes, special cables, etc.
1.02.19 CABLES :
1. HT Cables
(i) 11 kV (UE) XLPE cables
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Sl.No. Parameter Description
1.0 Voltage Grade 11 kV (UE)
2.0 Duty type Heavy duty
3.0 No. of cores 3 cores
4.0 Reference standard IS:8130 – 1984
IS:5831 – 1984
IS:3975 -1988
IS:1554, part - 1, 1988
IS:3961 (Part-II) - 1967.
IS:7098 Part-I & II
IEC-60502
5.0 Conductor type Compact circular stranded (rm/V) aluminum
conductor, with conductor screening of extruded semi
conducting material . Conductor construction class-2
as per IS 8130-1984.
6.0 Insulation type XLPE insulated and insulation provided with shielding
of extruded semi conducting compound over individual
core followed by lapped semi conducting material and
copper tape (non magnetic) metallic screen , cores
stranded together with a holding tape provided with a
common covering of extruded inner sheath of type
ST2 compound .
Thickness of the insulation shall be 5.5 mm for size
3x185 sq.mm as per table-2 IS 7098 (part-II) 1985.
7.0 Armour Galvanized steel wire armoured .
For multi core cables , armouring shall be applied over
the inner sheath by flat steel wires strips( formed wire).
Round steel wire armouring can also be offered.
For single core armoured cables non-magnetic armour
consisting of hard drawn flat or round aluminium wires
shall be provided.
8.0 Outer sheath Overall PVC outer sheath of type ST-2 compound as
per IS 5831/1984. Outer sheath should be applied
with extrusion only cables to be ISI marked.
Thickness of the outer sheath shall not be less than
3.6 mm for size 3x185 sq.mm as per table –5 of
IS:7098 )part-II)/1985 & IS:10462 (part-I)/1983). The
sheath shall be black in colour .
Suitable chemicals shall be added into the PVC
compound of the outer sheath to protect the cable
against rodent and termite attack.
9.0 Miscellaneous Copper screen shall be suitable to carry 1 KA E/F
current for one second.
10.0 Temp. rise on continuous 90 deg.C
load
11.0 Oxygen index of outer sheath Shall not be less than 29 at 27 ± 2 deg. C.
material for XLPE Cable
12.0 Temperature index Not below 250°C.
13.0 Max. conductor withstand 250°C
temperature during short
circuit.
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Sl.No. Parameter Description
1.0 Voltage Grade 6.6 kV (UE).
2.0 Duty type Heavy duty
3.0 No. of cores 3 cores
4.0 Reference standard IS:8130 – 1984
IS:5831 – 1984
IS:3975 -1988
IS:1554, part - 1, 1988
IS:3961 (Part-II) - 1967.
IS:7098 Part-I & II
IEC-60502
5.0 Conductor type Compact circular stranded (rm/V) aluminum conductor,
with conductor screening of extruded semi conducting
material . Conductor construction class-2 as per IS 8130-
1984.
6.0 Insulation type XLPE insulated and insulation provided with shielding of
extruded semi conducting compound over individual core
followed by lapped semi conducting material and copper
tape (non magnetic) metallic screen , cores stranded
together with a holding tape provided with a common
covering of extruded inner sheath of type ST2 compound .
Thickness of the insulation shall be 5.5 mm for size 3x185
sq.mm as per table-2 IS 7098 (part-II) 1985.
7.0 Armour Galvanized steel wire armoured .
For multi core cables , armouring shall be applied over the
inner sheath by flat steel wires strips( formed wire) .
Round steel wire armouring can also be offered.
For single core armoured cables non-magnetic armour
consisting of hard drawn flat or round aluminium wires
shall be provided.
8.0 Outer sheath Overall PVC outer sheath of type ST-2 compound as per
IS 5831/1984. Outer sheath should be applied with
extrusion only cables to be ISI marked. Thickness of the
outer sheath shall not be less than 3.6 mm for size 3x185
sq.mm as per table –5 of IS:7098 )part-II)/1985 & IS:10462
(part-I)/1983). The sheath shall be black in colour .
Suitable chemicals shall be added into the PVC compound
of the outer sheath to protect the cable against rodent and
termite attack.
9.0 Miscellaneous Copper screen shall be suitable to carry 1 KA E/F current
for one second.
10.0 Temp. rise on continuous 90 deg.C
load
11.0 Oxygen index of outer Shall not be less than 29 at 27 ± 2 deg. C.
sheath material for XLPE
Cable
12.0 Temperature index Not below 250°C.
13.0 Max. conductor withstand 250°C
temperature during short
circuit.
2. LT CABLES
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(i) 1.1 kV Power Cable
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- Power cables shall be selected from core sizes of 6,
10, 16, 25, 50, 70, 120, 150, 240 & 300 sq.mm
(Aluminium conductor).
11.0 Temp. rise Shall be limited to 90 deg.C.
12.0 Core identification - Cable identification will be provided by embossing on
the outer sheath the following:
• Manufacturer’s name & trade mark
• Voltage grade
• Year of manufacture
• Type of insulation
- R,Y,B for phases .
- Black for neutral (fourth core)
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colouring of insulation.
- For cables having more than 5 cores, core identification
shall be done by numbering insulation of core
sequentially.
- All the numbers shall be of same colour, which shall
contrast with the colour of insulation.
- Numbers shall be written in figures and words both
- The numerals shall be legible and indelible.
- The numbers shall be repeated at regular intervals
along the core, consecutive numbers being inverted in
relation to each other.
- When number is a single numeral a dash shall be
blacked underneath.
- If the number consists of two numerals, these shall be
disposed one below the other and a dash placed below
the lower numeral.
- The spacing between consecutive numbers shall not
exceed 100 mm.
9.0 Spare Cores - 20% spare cores but not less than 2 spares shall be
provided in all the multi core cables .
10.0 Reference standard As per relevant IS with latest amendments
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11.0 Miscellaneous - The Tenderer shall furnish necessary calculations to
show that the selected cable satisfy the criteria
including for voltage drop.
- Cables for temperature detectors shall be screened
type of required technical parameters with core size not
less 1.5 sq.mm.
- The special twisted paired cables shall be of the type to
provide balanced signal transmission and shall have
good noise immunity.
12.0 Core identification - Cable identification will be provided by embossing on
the outer sheath the following:
• Manufacturer’s name & trade mark
• Voltage grade
• Year of manufacture
• Type of insulation
- Cores of the cables upto 5 cores shall be identified by
colouring of insulation.
- For cables having more than 5 cores, core identification
shall be done by numbering insulation of core
sequentially.
- All the numbers shall be of same colour, which shall
contrast with the colour of insulation.
- Numbers shall be written in figures and words both
- The numerals shall be legible and indelible.
- The numbers shall be repeated at regular intervals
along the core, consecutive numbers being inverted in
relation to each other.
- When number is a single numeral a dash shall be
blacked underneath.
- If the number consists of two numerals, these shall be
disposed one below the other and a dash placed below
the lower numeral.
- The spacing between consecutive numbers shall not
exceed 100 mm.
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respective TS)
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Temperature Index : Minimum 250 deg. C
Smoke density : Minimum average light transmission of
40%
Acid gas generation : HCl gas released 20% maximum
Flammability test on
group of cables : As per standards mentioned
Flammability test : As per standards mentioned
Fire resistant test : As per standards mentioned
01. Trolley lines and power supply arrangements for cranes (DSL System)
Power to all the bays shall be fed from crane LTSS through PDB’s installed in respective
bays . Number of panels shall be decided as per requirement (to be indicated by the
tenderer . Isolator (MCCB) for each feeding section will be provided in each bay .
All the PDB’s shall have 02 incomers and 01 buscoupler . Normally both the incomers will
be charged and buscoupler will be OFF . In case of power failure or any fault power will be
fed from either of the incomers . Incomers , buscoupler and busbars shall be designed to
take care of entire load of the cranes .
Crane trolley lines feeding cranes in major production units shall be sectionalized with two
separate feeding points. Two fully rated MCCB / ACB shall be provided for each incomer
feed point to crane DSL. Sectionaliser shall be provided between the two incoming ACBs
with necessary padlocking arrangement.
Isolator (MCCB) panels shall be provided for the repair section for maintenance by the
tenderer .
In case of circuit breaker rating more than 630A , ACB’s shall be provided . All the ACB’s
shall be installed in a PDB which shall in turn be installed in the bay / shop floor . In case of
circuit breaker rating is 630A or less , than the MCCB (as isolator) with earth fault
protection and magnetic over current release shall be mounted in the respective column of
the feeding bay in a separate enclosure at manheight level .
Signal lamps shall be provided just below the trolley lines at 60m intervals as well as at the
beginning and end of each section/repair section to indicate whether the trolley lines are
energized or not.
Insulation air gap between two sections of a sectionalised trolley line shall be minimum 50
mm for voltage levels upto 500V, but in no case should be greater than the length of the
current collector on the crane.
Maintenance Bay
When two or more cranes are fed from the same trolley line, maintenance bays (repair
sections) shall be provided with sectionalizing isolator so that repair or maintenance of any
crane can be carried out without disturbing the operation of the other cranes. Necessary
DSL arrangement for repair section shall be provided by Tenderer.
Isolator panels shall be provided for each repair section for maintenence. Dead zones shall
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be provided with isolator arrangements to prevent collision between cranes and momentary
paralleling to two incomer supplies. Incomer ACB's shall be provided with earth fault
protection and magnetic over current release. The DB,s shall be located suitably on the
shop floor.
For end zones, minimum length of maintenance bay shall be 2 m plus the crane width. For
middle zone, the length of hospital bay shall be 4 m plus the width of crane.
Repair section shall be provided with red lamp steady/flashing fixtures at four corners.
These fixtures shall be located at crane gantry with manual ON/OFF provision.
Boarding or access platform shall be arranged within the limits of each repair section for
approach to be crane.
The Power conductors or down shop lead (DSL) shall have 4 conductors, 3 phase, 4
trolley line system ( 3 power + 1 earth) .
Trolley power conductors shall be of mild steel angel sections / rails .
For cranes/hoists upto 10 t capacity, the DSL shall have 50 x 50-x 6 mm MS angle. For
cranes above 10t upto 100 t, the DSL shall have 75 x 75 x 6-mm MS angles. For cranes
above 100 t, the DSL shall have to maintain rail size of 75 lb.
Expansion and section gaps shall be provided in rails at every 30m. The gaps shall be
cut at an angle of 30 degree to the rail and shall be 50mm wide. The gaps shall be
provided with flexible joints. The conductors shall be supported at 3000 mm intervals by
insulators mounted on brackets welded to crane girders.
Looping cables shall be used in parallel with the conductor rails and aluminium equalising
strips shall be provided, wherever necessary, for limiting the voltage drops. However,
aluminium equalising strips shall not be used in the hot areas like slag / liquid steel / slab
/ slab yard etc. In such areas, copper cable looping shall be used.
In order to provide electrical continuity across the expansion joints the power conductors
on both sides of the joints shall connected by stranded aluminum conductor jumper, fitted
with steel Aluminum strap and lugs suitable for the steel angle sections .
The power supply feeder and trolley line conductors/looping cables shall be selected so
as to limit the voltage drop to within 15% of the rated voltage at the crane motor
terminals for the short time peak current corresponding to the starting of the largest
capacity motor and the maximum continuous operating current of the rest on the system.
Expansion and section gaps shall be provided in rails at every 30m. The gaps shall be
cut at an angle of 30 degree to the rail and shall be 50mm wide. The gaps shall be
provided with flexible joints.
The section shall be straight, unbranded and smooth on the running surface. Joints
between lengths of angles shall be welded and all welds shall be finished flush with
parent metal. The conductors shall be painted with anticorrosive paint, except for contact
surface. Parallel aluminum buses shall be provided as specified. The jointing of standard
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lengths shall be made by 100% but welding and top surface finished smooth by grinding
to get free movement of the current collectors.
The insulators used for the manufacture of trolley line holders shall be preferably steatite,
tufnol or porcelain insulation material having substantial mechanical strength specifically
against blows and vibrations. They shall be capable of withstanding the impact and shocks
resulting from operation of the machine. The creepage distance of the insulators shall not
be less than 80 mm.
The insulators used in the LT/AC system shall have the following minimum flashover
value and mechanical strength :
Dry flashover voltage : 25 kV
Wet flashover voltage : 12 kV
Ultimate mechanical strength : 1000 kg.
The trolley line holders shall generally conform to the design shown in the drawing to
be furnished to the successful Tenderer. All sharp edges shall be ground smooth. The
porcelain insulators shall be manufactured and tested as per IS: 1445 –1997
The trolley line conductors shall be mounted on holders. The holders shall be bolted on to
brackets which in turn shall be welded on to crane girder at stiffeners at regular intervals. In
normal run, intermediate type of brackets shall be used, but when sectionalizing gaps or
expansion joints are provided, sectionalizing type of brackets shall be provided.
These are meant for connecting parallel aluminium bus, at expansion joints, power supply
cables from load break switch. They shall be complete with MS cadmium coated bolt nuts,
spring washers, lugs etc.
Signal lamp assembly shall be industrial, heavy duty dust tight and water proof in
construction suitable for indoor or outdoor locations. The units shall comprise three lamps
for three phase with red glass lens and reflectors. The lamp shall be provided with dropper
resistance connected in series with the lamp and the resistance shall be rated for
continuous inclusion in the circuit. Alternatively, a built-in transformer may be provided to
suit the lamp voltage.
These buses shall be of E.C. grade aluminium. They shall be free from any deformity in
profiles.
08 Current Collectors
2 nos. current collector shall be provided per trolley line each rated for 100% of total rating
. The collector shoe will be of heavy duty design and chamfered at both ends, each rated
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for 100% of total crane rating. Double collectors on each earth trolley line shall be provided
and these shall be different from those on power trolley line. Collector shall be multi hinged
for self – aligning. Collector will be designed in such a way that load is transmitted not no
the insulators but on the insulator stud to avoid damage to insulators.
One adequately rated isolator (MCCB/ACB) with locking facility shall be provided
immediately after current collectors on incoming line on the crane. The isolator shall be
capable of carrying current of two largest motors.
Power from the isolator shall be taken to the air circuit breaker to be provided in operator’s
cabin. In case of pendant operated cranes, this circuit breaker shall be located in protective
panel located at bridge platform.
The breaker shall be provided with under voltage, over load and short circuit releases. The
breaker shall also be with earth fault protection . The breaker can be closed only when :
Flexible trailing cable systems mounted on retracting support system shall be used. The
system shall consist of insulated multi-conductor or several single conductor cable with
permanent termination on the bridge and on the trolley. The flexible trailing cables shall
have ample length and shall be supported by means of properly designed movable clamps.
These clamps shall be fitted with rollers and shall run freely on a guide rail allowing relative
movement of bridge and trolley without undue stress or wear on the suspended cable.
Provision later stage in case of necessity. The flexible cable shall be butyl rubber or EPR
insulated CSP sheathed type.
For rotating trolley cranes, power supply shall be through festoon cable arrangement
slipring or cable basket. Cable reeling drum or cable basket shall be used for power supply
to the magnet from the trolley. Two spare turns of cable provided on cable reeling drum.
The cable reeling drum shall be directly driven by hoist mechanism, a clutch shall also be
provided to disconnect the drum from hoist mechanism.
Flexible cables system mounted on latest PVC linked chain system in normal area &
metallic chain systems in hot area. (New point)
11. Meters
Ammeter and voltmeter with selector switches shall be provided on the incoming line in
operator’s cabin.
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12. Control features
All controls shall be fully magnetic, operated through master controllers. All travel motions
shall be provided with plain rotor resistance control with plugging. For long travel drives, the
electrical control shall be grouped for the individual pair of motors separately in case of four
motor drive and each pair of motors shall be able to drive the crane at reduced
acceleration and speed. As an anti-skewing measure, out of a pair of motors for LT., if one
drive motor trips, the other drive motor shall also be switched off. For pendant control,
plugging shall be avoided for travel motion.
Synchronization of separate drives where required shall be done with the used of solid
state thyristor control.
For all hoist motions, except where creep speed is required, plain rotor resistance control
shall be provided on all master controller notches in the hoisting direction. The rotor
resistance shall be cut out gradually when moving from lower to higher notches such that
current peak of 2 times the rated current is not exceeded. In the lowering direction of the
motion, controlled lowering shall be provided using one/ two plugging notches, one single
phasing notch and one/ two super synchronous power lowering notches. For obtaining
creep speed, conventional methods like planetary gear system, DC. injection (where
requirement calls for creep speed in lowering direction only) etc. may be offered.
Hoist control circuit shall also be provided with anti-drop feature i.e., whenever the master
controller is brought back to zero position from higher notches in both directions, the motor
shall automatically be connected to hoisting direction for some time (time adjustable
through timers) to avoid the downward drift of the load. Brakes shall be clamped in zero
position of the master controller.
Tenderer shall supply one no. of Ground Control Post in Pedestal for installation in PCM
control room. The control post shall have following facilities:
a) Control on PB- This shall transfer the control of CT and auxiliary hoist from cabin ,
master controller to ground control post and will not allow LT motion from cabin.
b) For CT and aux. Hoist 4 push buttons each (total 8 PBs) shall be provided on ground
control post for following application:
c) 10% speed of hoist & lower
d) 30% speed of hoist & lower
e) 10% speed of CT forward & reverse
f) 30% speed of CT forward & reverse
The control post shall be connected to the main control of cabin on crane through hear
resistance flexible cable with copper conductor arrangement and plug and socket system.
The socket shall be fixed to the cabin. The no. of pins for socket, no. of additional aux.
Contactor, no. of cores for flexible cable to achieve the above control shall be decided by
the Tenderer during detail engineering and shall be included in the scope of supply of
Tenderer.
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Further, Tenderer shall quote radio control system to achieve the above control
requirement as an optional feature. Cost for the radio control option shall be indicated
separately.
Thyristor control shall be provided for all the cranes operating in areas where ambient
temperature is more than 50 deg. C . Control shall be achieved through master controllers
for each direction. Rated and creep speeds are to be provided in each direction i.e.,
hoisting and lowering. Creep speed shall be 10% or lower as per operational requirements
of rated speed.
The thyristor regulator shall be fully controlled and suitable for four quadrant operation.
Speed control of the slipring motor shall be achieved through regulation of stator voltage
with resistance in the rotor circuit, if necessary. The reversal of direction shall be through
magnetic contactors which shall open and close at zero current.
The continuous rating of the thyristor converter shall be at least 2.0 times the motor rated
current at the mechanical KW and the converter shall be designed and rated for load
requirement taking care of peak currents during acceleration, normal operation and
regeneration conditions. The dv/dt and di/dt rating of the thyristors shall be suitably
selected.
The repetitive PIV rating of semi conductor devices shall not be less than 2.5 times the
peak of normal system voltage. Thyristor bridges shall include R.C. snubber circuits across
the thyristor, high speed semi-conductor fuses with micro-switches for monitoring of failure.
Closed loop regulation suitable for the system with various feed back such as speed,
current etc. shall be provided. Speed feed back shall be through tacho-generator of
permanent magnet type mounted on the non-driving end of the motor shaft. The regulation
shall include ramp generators, potentiometers for various setting, various regulators, signal
conditioners, logic command module sequence, module, trigger module, zero and over
speed monitor, torque less protection module etc. as per the requirements. The control and
regulation equipment shall be able to maintain their rated performance and control quality
even under conditions of variation of +10% and - 15% in voltage and +5% in frequency. A
zero current sensing device shall be incorporated. The reversing of stator contactor shall
be done at zero current. Braking down to zero speed shall be electrical with mechanical
brake setting only at zero speed. Protective features like anti-drop etc. shall be
incorporated to prevent load setting. The circuitry shall also provide for the protection
against failure of motor torque such that the mechanical brake sets in such cases. All other
features of conventional crane controls shall also be built into the scheme. The following
shall also be provided on the A.C. side.
- Surge suppressor
- Over current protection
- Overload protection
- Single phase protection
- Phase sequence protection
- Ammeter and voltmeter with selector switches
- Isolating switches
Control and auxiliary supply shall be provided with separate transformer and under voltage
protection.
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The test shall be performed as per IEC : 146.
Details of the system offered shall be furnished along with necessary single line diagrams
and block diagrams.
All the control modules shall be grouped in a sheet steel enclosure. The control module
cards shall be made of epoxy glaze and suitable for plugging into the racks. The cards shall
be locked into the rack, which carries a sealing bar and assists locking of the cards thereby
cutting down on the wear of the printed circuit connector contacts which can be subjected
to high rate or vibration and further avoid the disconnection of cards from the connector.
The thyristor panel shall be suitably mounted so that little vibrations are reflected to the
components and connection.
The cables for the thyristor controller and associated equipment shall be laid and clamped
separately on the crane.
VFD control shall be provided for cranes operating in areas where operating temperature is
50 deg. C . Control shall be achieved through master controllers for each direction. Rated
and creep speeds are to be provided in each direction i.e., hoisting and lowering. Creep
speed shall be 10% or lower as per operational requirements of rated speed.
The VFD shall be fully controlled and suitable for four quadrant operation (active front end
type) . Other details of VFD shall be as per respective clause for VFD in the GTS.
16. Panels
There will be separate panels for each motion in addition to the protective panels and
resistance panels.
Power and control terminals shall be segregated. 10% spare terminals shall be provided in
each panel.
Equipment in the panel shall be so mounted that their removal or replacement from the
front is easy.
The panels shall be mounted along the girder facing the hand railing. Sufficient clearances
shall be provided between the panels. A minimum clearance shall be provided in front of
the panels for walkway and approach as per I.E. Rules. The panels shall be supported in
the back from the girder to avoid vibrations. Open type panels may be used for installation
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inside the box girders. In this case, adequate lighting and ventilation shall be provided for
the room.
17. Switchgears
Each mechanism motor shall be provided with MCCB, contactors on stator and rotor sides,
Electronic over load relays and suitably rated rotor resistances. In case of thyristor
controlled drive, each mechanism motor shall be provided with breaker / switches,
transformer, thyristor, rotor resistances, contactors on stator and rotor side etc. Each motor
shall be fitted with a tacho-generator for speed feed back. The speed range shall be 0-
160% of rated speed.
Rating of contactor selected for any mechanism shall be at least 50% higher than the
respective motor full load current for the mechanism at 40% duty cycle. The minimum
rating of the contactor used shall be 32A and the life of each contactor shall not be less
than 10,000 hrs. of operation.
Reversible directional contactors shall be inter locked both mechanically and electrically.
18. Motors
Heavy duty reversible crane service, totally enclosed fan cooled, foot mounted, wound rotor
motor conforming to latest edition of IS:325-1996 shall be used for various drives. Class of
insulation shall be F/F (Stator/Rotor) with temperature rise limited to that for ‘B’ Pullout
torque to the not less than 225% and 275% of full load torque corresponding to 40% CDF
for class 1 & 2 and class 3 & 4 duty cranes respectively.
All motors shall have the terminal box at top. Frame sizes shall conform to IEC Standards.
While selecting the motor rating following shall also be taken into consideration :
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- Type of controls used
- Inertia of the motor and mechanism
- Ambient correction factor
- Service factor
- Derating for thyristor control
- Wind pressure
]
Maximum permissible operating speed shall be 250% of synchronous speed or 2000 rpm
whichever is less. Over load capacity 150% of full load current for 2 minutes without damage or
permanent deformation.
19. Brakes
Brakes shall be D.C. electromagnetic type , confirming to AISE standard. The brake coils shall
be made of copper and of insulation class ‘F’.
Brakes shall be designed to fail safe whenever the current is interrupted either intentionally or
by failure of the main supply.
Brake circuit forcing shall be provided for D.C. brakes. D.C brake circuit shall be switched off
on D.C. circuit for quick operation of brake.
A separate set of parking brake for L.T. motion shall be provided for each out door crane.
Power supply for these brakes shall be obtained from protective panel.
Roller lever operated, resetting limit switches shall be provided for all travel motions. For each
hoist motion, a rotary cam type over hoist and over lower, self resetting limit switch shall be
provided. This limit switch shall have independently adjustable cams for hoisting and lowering
motion. The cams shall have adjustability such that end limit can be set to within 100 mm of the
hoisting or lowering motion. In addition to this, a back up ultimate limit switch of series/ shunt
gravity type shall be provided to prevent over hoist. The later shall be of manual reset type. In
case of cranes handling hot metal, the gravity limit switch shall preferably be of series type.
Provision shall be made to bridge the gravity type limit switch contact by push button/ switch or
any other means to lower the load. An indication shall be provided to the operator whenever
this limit switch has operated. Suitable limit switch shall be provided for slack rope, gate/door
opening, slew mechanism, grab closing/ opening etc. wherever necessary. Protection class of
the limit switch shall be minimum IP 65 .
In cranes where two or more cranes are operating in the same bay( at same or different level )
all cranes shall be provided with suitable Anti- collision system. Anti-collision device shall be
electronic type.
A sound signal shall be provided to the crane operator when they are at certain safe distance
apart ( distance to be adjusted as a function of speed at site) and crane shall stop. After few
seconds, it shall be possible to run the cranes towards each other ( or only one crane can move
towards the other) till buffers of the cranes meet by providing “by pass’ in the operators cabin.
Anti-collision shall also be provided on trolley for twin trolley cranes along with suitable by pass
arrangement.
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22. Resistances
Air cooled, robust, heavy duty, corrosion resistant fechral edge wound resistance. Resistance
shall be in single phase execution. In a particular box the rating of resistances shall be the
same. Resistance shall have vibration proof only.
Rated for 10 minutes duty. Continuous duty rating of resistances shall be provided in case of
hoist motions controlled by thyristor converters.
Maximum temperature (absolute temperature) of resistor elements shall be limited to 335 deg
C at desired duty. Suitable tapping points shall be provided.
Resistance boxes shall be mounted in racks that permit independent removal of any selected
box.
Cam type master controller with joy stick type lever shall be used.
Duel master controller operated with single handle shall not be used.
Master controller for each motion controls shall have four/ five notches in each direction.
Master controller for electro- shall have three positions i.e Lift- Off-Drop. It shall have spring
return from drop position to Off position.
Lighting shall be provided in operator’s cabin, stair cases, platforms and working areas.
Minimum 4 nos. 400 watts high pressure sodium vapour flood lights equally spaced (under
crane girders) about the crane span shall be provided along with shock absorbing and anti-
swing suspension arrangements. More numbers of fittings shall be provided if required for
cranes with longer span and/or longer height of lift.
Fluorescent lamps with necessary fittings shall be used for operator’s cabin, staircases,
platforms etc.
Adequate number of hand lamp socket outlets ( 2 Pin, 10A, 24V) and power socket outlets ( 3
Pin, 20A, 240V) shall be provided along with switches socket & switch shall be interlocked
suitably. A hand lamp( 160W SLS lamp with enclosed type battery and wire guard) along with
sufficient length (15m) of cable with a plug shall also be provided for each crane.
25. Electromagnets
All magnets shall be suitable for steel plant application and shall be welded construction.
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Magnets shall be rated for 230 V DC and suitable transformer – rectifier units shall be provided
for feeding them. Rectifiers shall also be suitable protected by suitable protective device.
Magnets shall be class ‘H’ insulated, at least 50% rated, copper conductor would and shall
have surge suppressor box and separate in terminal box for termination of cable. Magnets for
production cranes handling hot products shall be 75% rated. Surge suppressor shall be
compact , non-linear resistor silicon carbide thyrector, variator or metrosil type.
Wherever specified, a set of batteries, a battery charger, one annunciation system and other
accessories shall also be provided along with magnet so that the magnet can hold the full load
for atleast half an hour in case of power failure.
a) In case of pendant controlled crane following shall be included on the pendant unit :
Push button for : Hoist slow, hoist fast, lower slow, lower fast, left cross
traverse, right cross traverse, forward long travel,
backward long travel, emergency stop conditions.
- Master controllers for all the motions and magnet (wherever applicable).
- Emergency stop push button.
- Foot switch for alarm or bell.
- Switches for all lighting equipment on crane.
- Switches for air conditioner, exhaust fan and for cabin fan.
- A fire extinguisher.
- Insulating mat and operator’s chair.
- Cabin light.
Annunciation panel with indication lamps for power ‘ON’ control ‘ON’ emergency corner
switch operated, ammeter and voltmeter with selector switches.
In this case there should be the facility of controlling the crane from the control pulpit .
All the control facility available in case of operating from the operator's cabin is duplicated
in the control pulpit through the cable .
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d) Radio remote control :-
The system shall have capability to provide range of 1.5 times the long travel distance of
the crane .
In the case of signal failure, all motion shall come to a safe stop.
(i) Slow speed on the first step of the breaker contact / pushbutton of the radio remote
control representing the first or second notch of the master controller.
(ii) Full speed on the second step of the breaker contact / pushbutton of the radio
remote control representing the final notch of the master controller.
Transmitter :-
Receiver :-
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Receiver shall have following features :-
- Upto 20 functions exclusive safety relays (for transmitting preset reference values to
VFD in the crane).
- 2 safety relays (for control of main contactor)
- Power supply suitable for 240 V AC ,6 A.
- Minimum 16 different operating frequencies.
- Two redundant microprocessors for monitoring each others .
- Cyclically redundancy check check for high secutity of transmitted radio messages .
- Frequency scanning in the receiver .
- Memories last 10 users .
- Interlocking of the relays .
- Momentary or latched relay functions .
- Two hand up start ( to avoid unintentional start).
- Protection class : IP - 65.
- Casing material : Aluminium profile for fast mounting on DIN rail .
- Operating temperature range :- Min. 10 deg.C to Max. 60 deg.C
27. Cables
All cables shall have stranded copper conductors. Control wiring shall be with 2.5 mm2
copper; minimum size of power cable shall be 6.0 mm2. Fixed wiring on cranes shall be
carried out with PVC insulated. PVC sheathed armoured cable or EPR insulated CSP
sheathed cable or better.
All flexible cables (i.e. cables for magnet, trolley, feed, pendant unit etc.) shall have copper
conductor, EPR insulation and CSP sheathing or better.
All cable shall be suitably de-rated for grouping and higher ambient temperature.
All accessories like cable glands, clamps, pipes, wire and terminal marks etc. shall also be
provided.
Cable laying and terminations shall be such that the chances of cables getting damaged is
remote.
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In all passages and on trolley the cable shall be laid in trays and shall be covered by similar
trays and properly clamped & fixed.
01 LT Power Cable
1.1 kV, heavy duty power cable, 4/3.5 core with stranded sector shaped (sm) or with
compact circular stranded (rm/V) or circular stranded (rm) Copper conductors as
applicable, PVC insulated suitable for 70°C operation as per IS:5831-1984, core stranded
together provided with a common covering of PVC inner sheath, galvanized round steel
wire armoured and PVC outer sheathed, multi core conforming to IS:1554 (Part-I – 1988)
Type TWY.
02 Control Cables
1.1 kV, circular stranded (rm), annealed copper conductor, PVC insulated suitable for 70°C
operation, as per IS:5831-1984, cores stranded together provided with a common covering
of PVC inner sheath, galvanised round steel wire armoured and PVC outer sheathed, multi-
core similar to IS:1554- (Part-I)-1988, Type YWY.
1.1 kV grade, heavy duty type with tinned annealed high conductivity flexible copper
conductors, ethylene propylene (EPR) insulated and chlorosulphorated polyethylene (CSP)
sheathed conforming to IS:8130-1984, IS:6380-1984 and IS:9968 (Part-I)-1988.
28. Earthing
A ring earthing system shall be provided on the crane. Each and every electrical equipment
shall be connected to this earthing at least at two points. However the electronic circuit
insulated earth wire shall run in panel and terminate at main earth connection only at one
point. The earthing shall be connected to the fourth trolley line in DSL system through 2 nos
of current collector. Additionally current collectors shall also be provided on crane rails for
earthing on crane . All these collectors shall be connected to earthing ring.
An earth core shall be provided in trolley feed cable and the magnet. The cable reeling
drum shall have a separate slipring for earthing purpose.
Rubber mattings shall be provided in front of the protective and control panels.
All bonds between earth conductors and crane parts shall be welded if possible, or rivetted
and soldered. Where screwed bonds are made, care shall be taken that there is
satisfactory contact surface and nuts shall be locked to prevent their loosening. Earth
connections to equipment shall be made by means of multi strand flexible conductor to
adequate section.
The earth ring on the crane/ machine shall be connected to the plant earthing system
through to gantry rails. Each end of each gantry rail shall be bonded to the plant earthing
system.
In addition, intermediate earthing bond shall also be provided on the rails at every 60 m in
case of longer tracks.
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Flexible copper bonds shall be provided across any gap in the running gantry rail.
For mobile equipment with flexible cables, one separate copper conductor of adequate size
shall be provided for earthing.
Electronic weighing system including calibration equipments, cables, load cells and panel
mounted associated electronics (microprocessor based) with communication capability with
PLC on bus.
Cranes & hoist (as per scope of supply) including their complete electrics & control (as
given in relevant chapter) including power supply, power conductor lines (DSL) , Load
break isolators (to be located in bay) & cables .
Crane weighing system to be connected to ground station by Radio link module. Necessary
hardware & software including cables for above as well as communication of ground station
with main automation network of shop automation system to be considered.
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each weigh unit, power supply unit etc. the Amp. Hour of the battery shall be adequate
enough for minimum one month working.
ii) Hand held unit based on radio frequency signal with toggling facility for current and
cumulative weight display complete and charger, long range antenna ( as per site
requirement ), wireless communication interface, provision for entering product and
customer details. This unit will have calibration facility with password protection.
iii) Wireless Transreceiver at PC end (with IP65 enclosure), power cable, antenna (if
required as per site condition)
iv) Commercial grade PCs.
v) The required tools and testing instruments for normal maintenance and operation of
the equipment.
vi) The weighing system shall have real time connectivity to the plant MES / ERP through
plant wide network.
vii) Supply of following tools and testing equipments:
a) Digital Multimeter 4 ½ digit- 2 nos. (make: Philips / HP / Fluke)
b) Portable Think pad based software programmer (make: HP / IBM / SONY) - 1 no.
c) Universal calibrator (make: HP / Fluke)-1 no.
d) Professional tool kit (make: RS / Philips)
viii) Integration of subunits.
ix) Supply of complete data, design calculations, technical literature and documents,
erection / maintenance and operation manuals, erection drawings, Quality Assurance
Plan (QAP) and as built drawings.
x) Supply of special tools and tackles, commissioning spares.
xi) Component level training to maintenance staff of BSP at the tender’s works.
xii) Earthing.
xiii) Stamping and verification at the manufacturer’s works by the tender as required under
Weights and Measures Act.
xiv) Suitable safety devices for the protection of the weighing and processing system
against impact loading.
1.02.21.01 Guidelines for design of system and engineering the layout of electrical
equipment.
001 General
The tenderer shall prepare the layout drawings for civil assignment and civil drawings for
construction of the substation buildings and civil buildings for other electrical premises
taking into consideration the requirement listed below. In case of total turnkey contract
the civil aspects mentioned in following specification shall be adhered to while planning /
executing civil work.
• All electrical premises shall have adequate space to accommodate the electrical
equipment from the point of view of operation and maintenance, and conform to IE
Rules & Regulations.
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• The clearance between the ceiling of the electrical room and top of the tallest
equipment shall not be less than 1m, 2m where the equipment are to be
maintained from top and additional height of lifting tackle wherever required.
• Lifting/handling facilities shall be provided. Rolling shutters shall be provided to
facilitate transportation of the equipment into and out of the electrical room, MCC
rooms.
• Electrical room located on the top floors shall have erection openings and landings.
• All electrical rooms shall have cable basement/cable galleries /cable trenches as
per equipment layout in the electrical rooms . The clear height of the
basement/cable gallery walkways shall be minimum of 2.2 m for cable tunnels and
3 m for basement/galleries.
• The wall of the basement shall have water proofing and draining facilities below
ground level.
• All electrical rooms shall be constructed with heatproof material at the roof if it is
exposed to sunlight .
• Cable basement/galleries shall be provided with suitable lighting/ventilation
facilities.
• 24V AC sockets fed from dry type L.V. transformers shall be provided for hand
lamp connection throughout the premises including basement and cable tunnels.
• Airtight double door arrangement shall be provided for electrical rooms and
basement. The stairs to the basement shall be from inside the electrical room.
• Welding power socket outlets shall be provided within basement at intervals of
60m with minimum of one, where basement is less than 60m long.
• Electrical room and cable galleries/basement shall be considered fire hazardous.
• Roofs of the electrical premises shall be fully watertight and moisture proof.
• Erection openings with removable cover plates shall be provided on the floor of the
electrical rooms connecting the basement/cable gallery.
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004 Cable tunnels
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(in mm)
1.0 Back clearance 1250
2.0 Front to front clearance between drawout / semi- 2500
drawout panel boards
3.0 Between two panel boards installed in a row 1000
4.0 Between front of the panel to the wall of the room 2000
5.0 Between the wall and end of the switchgear / MCC 1000
6.0 Back to back clearance 1500
7.0 Back to front clearance 2000
8.0 Between the bottom of the ventilation duct and top of As per statuory
the electrical equipment requirement and
regulation
• Resistance boxes shall be floor mounted and shall be placed on the floor near the
respective MCC.
• Disposition of control desk, mimic boards, instrumentation panels shall be properly
located for visibility and operational convenience.
• Profile & dimension and painting of control desk / mimic panels shall be same as
for control room for aesthetic design
• In any other case, the layout shall confirm to provide clearances as per Indian
Elect. Rules.
All mineral oil filled transformers shall have oil soak pit around it. These soak pits in
turn shall be connected to a common catch pit for collection of oil. The capacity of
catch pit shall be equal to 1.2 times of the oil content of the biggest transformer.
In case oil filled transformers are located inside the shop, the catch pit shall be outside
the shop connected to soak pits by pipes. Also the transformer room shall
be enclosed on three sides. Access side may have steel framed gate with expanded
metal jali doors with wicket door provision.
All mineral oil filled transformer shall be separated from switchgear/electrical rooms
with partition wall. All transformers and heavy equipment shall have adequate
transportation and lifting facilities.
There shall be minimum 1m clearance all around the transformer. The ceiling height of
the rooms shall be 1.5 m above the conservator. The minimum dimension of
transformer room shall be 6mx6mx5.0m(H).
001 General
All the electrical equipment shall be installed with proper care and as per layout
drawings. Minor modifications required at site shall be made by the contractor with
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approval of purchaser representative/Consultant for installation of the equipment. Care
shall be taken for proper handling of equipment and undue vibrations shall be avoided
particularly in case of sensitive (instrument mounted on panels) equipment.
The contractor shall have valid electrical contractor's license valid for State Govt. and
as well supervisory licence. He shall have in his employment sufficient number of
electricians and supervisors holding valid licenses for HV and LV installations. It will be
the responsibility of the Contractor to get the installation cleared and relevant drgs.
Certified / approved by Electrical Inspectors , Factory inspectors, Insurance agencies
and other statutory authorities. The Govt. fees and necessary commercial aspects will
be taken care by the Contractor.
The erection work of motors shall include checking of all motors before installation
including thorough cleaning and checking of bearings, replacement / rectification of
defective items, greasing of bearing, if required, making minor modifications in its
mounting arrangement, wherever required, assembling and its mounting on the motor
base plate or on mechanical equipment, as the case may be, including levelling and
alignment, checking insulation resistance and improving the same, if necessary,
checking of internal connections etc.
All work associated with revisioning of motor shall also be included such as uncoupling
and removing of motor from mechanical equipment, disassembling, cleaning, checking
of insulation resistance and improving the same, if necessary, regreasing and replacing
defective items/bearings on foundation, wherever required, reassembling, placing,
levelling, aligning and fixing of coupling of the revisioned motor with mechanical
equipment.
The contractor shall check different parts and assemble the motor at site in correct
sequence wherever the motors are delivered in a dismantled state i.e. base frame,
bearing pedestals, armature, field frame etc. in separate packages.
Erection, alignment and securing shall be done under expert technical supervision.
Straight edges, feeler gauges, dial gauges etc shall be used for aligning purpose.
The height of the shaft of the motors shall correspond to the machine to be driven, if
discrepancies are encountered these shall be compensated by inserting machined
metal sim plates under the supports of the motor.
The motors mounted on the movable base frames / base plates shall be connected via
intermediate terminal boxes with flexible cables.
After the complete installation of the motors, all bolts and bolted joints of the
mechanical and electrical equipment shall be checked to ensure that they are done up
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tightly by torque wrench. A further check shall be made to ensure that the armature
can be easily rotated.
The insulation resistances of the coils and connecting leads within the machine shall be
checked against earth by a suitable megger. Insulation resistance if found less, the
machine shall be dried to achieve the desired value.
Space heaters of main drive motor required to be installed in motor foundation pits
shall be suitably and firmly mounted.
For handling the machine with the crane, the slings, lifting cables etc. shall not be
secured around the shaft. However, the armature of disassembled machines may be
lifted or supported by the shaft.
The machine shall be lifted or lowered without shocks or quick jerks to avoid any
damage.
Handling facilities of the motors shall be provided at places where direct crane
approach is not possible .
The system components delivered in separate packages like tank, gear pumps, filters,
pressure switches, thermometer, flow regulators, centrifuge etc. shall be assembled at
site and installed as per supplier's drawings. The supply and return pipelines along with
their supporting structures from the lubrication system to the motor bearing shall be
laid/erected by the contractor as per the relevant pipeline routing drawings. Meters and
gauges shall be fixed and wired.
003 Sheet metal enclosed panels, open control panels, control desks and boxes
The base frames of all panels, desks, posts etc., shall be welded to structures or to the
civil inserts provided on the floor/walls. Fabrication of supports/frames, wherever
required, shall be done by the contractor.
The shipping section shall be placed in position before removing the protective
covering to eliminate scratch/damage. The shipping section shall be moved by using
rollers under the shipping skids wherever lifting cranes are not available. The
contractor shall do the assembly at site as per manufacturer's general arrangement
drawings and installation instruction. While assembling a complete board comprising
several unit type cubicles, the board as a whole shall be aligned. The panels shall be
properly leveled prior to grouting the holding down bolts or welding the panels to the
inserts. All interconnection of busbars and wiring between the panels shall be done as
per manufacturer's instructions and drawings. Welding work on the panels shall only be
carried out after consultation with the purchaser. Damage to the paint due to welding
shall be rectified by the contractor.
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wiring of intermediate terminal strips between two panels, wherever disconnected for
transport, shall also be connected.
Each post shall be mounted at the place of installation in such a way that the operator
has both the plant and the post before him.
In cases where the control posts / boxes are separately mounted near the equipment,
the contractor shall manufacture a structural support for the same before mounting the
control posts/box.
The installation shall be carried out as per manufacturers' instructions & equipment
layout drawings.
The preservative grease from the metallic parts shall be removed by petrol and with
clean markin cloth. Grease from copper parts shall be removed with ethanol and wiped
with clean dry markin cloth.
The base frame of panels shall be welded to the civil inserts.
The panels supplied in separate shipping units shall be assembled at site as per
manufacturer's drawings / instructions. The unit installation shall be started with the
main converter. All the cabinets shall be aligned in a perfectly straight row and each of
them exactly leveled. All inter-connections shall be done as per manufacturer's
drawings/instructions.
Before the transformer is filled/topped with oil, oil samples shall be checked by the
contractor from each container. The oil shall possess the dielectric strength as per
relevant IS/CEA. Oil shall be filled upto the mark shown.
The contractor shall also test the oil from each transformer to determine its suitability
for use. If required, the contractor shall carry out drying and filtering operations as per
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IS code of practice to ensure that moisture is completely removed and the oil is free
from impurities. This may be carried out by using oil filtering equipment to be provided
by the contractor having vacuum as well as heating arrangement. Only after the
dielectric strength of oil and other parameters are checked and approved, the external
connections shall be made to the transformers.
The dial thermometers shall be screwed to the thermometer pockets after removal of
the blind plugs.
All necessary cabling shall be connected before charging of the transformer. This will
include signaling cables upto marshalling box and from marshalling box to meters, if
not already done, as well as inter cabling between surge suppressor cubicle and
transformer secondary.
Any modifications to HT and LT terminal box to accommodate the number of cables to
be terminated shall be carried out by the contractor.
Naked light and flame shall never be used near the transformer.
Reactor shall be suitably shielded to avoid magnetic interference to electronic circuit.
007 Busbar
Busbar installation shall be commenced from the middle section and the buses shall be
fastened without tightening the bolts. The buses shall lie freely on the insulators without
warping and if necessary, suitable packing shall be provided at the insulators.
Final tightening of the bolts shall be done after the complete laying of buses. Approved
means shall be used for tightening of the bolts.
While sectionalising, one middle safety section shall be arranged slightly in excess of
the crane braking distance so that it can act as a buffer and prevent the danger of
crane collector bridging the isolator gap and leading to accidents on other section
under repair or maintenance.
Boarding or access platform shall be arranged within the limits of each repair section
for approach to the crane.
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In the middle of the run between two expansion joints and at sectionalising gaps, the
rails shall be rigidly fastened/supported.
The resistance boxes shall be installed on frames to be welded to civil inserts already
provided.
Interplant cabling shall be done in cable tunnel. Overhead cable bridges / concrete
cable channels can be considered in case of lesser number of cables. Cables laid
overhead using separate structural cable bridge with suitable walkway of minimum
800mm wide for laying of cables. Cables of small in numbers and cables for drives/field
switches inside shop units shall be laid along the structures and columns of the shop /
buildings. Cables may run partly in walkable cable tunnels or underground trenches
and/or surface ducts in the shops and partly along the structures and columns of the
buildings.
In case of space constraints/restrictions, cable shall be laid in walkable cable tunnels.
Where the number of cables to be laid calls for walkable tunnels and cable shafts,
same shall be provided. Underground walkable cable tunnels shall have hydro sealing
to prevent water seepage.
For multi-layer installation, overhead cable bridge/walkable cable tunnels shall be used
depending upon the number of cables to be laid.
Laying of cables directly in underground or in trenches shall be avoided. However, it
may allowed in special case with permission from site in charge. In such case, cable
shall be laid in one layer only, more than one layer is not permissible.
Cables in trenches shall be laid on 8 cm of riddled sand and covered with 8 cm of
riddled sand. RCC slabs shall be provided for covering these trenches. The maximum
trench depth shall normally be 1.5 m and thickness of top cover of 75 mm. If the trench
is to cross railway tracks/roads or any load bearing area the cables shall be taken
through suitable GI conduits/pipes/ducts.
For crossing the road / rail track, cables shall be laid in concrete cable ducts, heavy
duty GI pipes . 25% spare conduits / pipes / duct openings shall be provided.
Installation of cables directly buried in ground shall generally conform to the
requirements given in IS: 1255 –1983.
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Ladder type cable racks and trays shall be provided to lay cables in
tunnels/shafts/cable basements. Cables shall be laid in separate racks according to
the voltage / application classification. Fireproof partitions such as asbestos sheets
shall be provided between trays carrying LT & HT power cables, control and screened
cables , communication cables , instrumentation cables & telecommunication cables.
The cables shall be laid from top to bottom in order of HT on top rack followed by LT
cables and other cables on lower racks.
All communication cables shall be laid through separate conduits to be installed in
different routes with suitable separation from the other electrical cables .
Conduits carrying special cables shall be painted, coded, marked as per plant norms.
All necessary frame works and fixings for the support of cables and accessories shall
be supplied.
Cables shall be suitably protected against heat, and mechanical damages.
Cables at fire partition wall crossings shall be painted with heat resistant paint 2 m on
either side of wall.
Power cables shall be laid on ladder type cable trays. Ladder type cable trays shall be
selected from sizes 300 mm, 450 mm & 600 mm and shall be fabricated from 50x50x6
mm MS angles for longitudinal members and 25x5 mm flats for cross members placed
at an interval of 250 mm along the length of cable tray. Control cables shall be laid on
perforated trays.
Supporting vertical racks and horizontal hooks shall be of 50x50x6 mm MS angles.
Cable racks and hooks shall be of welded construction.
To avoid damage during cable laying, cable structures shall have no scales, abrasive
or rough surfaces or cutting edges.
The over head cable bridge structure shall be designed considering future cable laying
and shall have 30% spare space for installation of future cable trays.
Walkway of minimum 800mm wide shall be provided for laying of cables.
Two numbers additional cable trays and 20% extra space on each cable tray for future
use shall be provided as far as possible .
Cable shall be fixed to racks or trays or cleats as required for proper support,
accessibility and neatness of installation. Hanging of cables racks over panels shall
not be permitted rather no cable shall be laid/pass over any electrical equipment e.g.
transformer, switchboards etc. Cable tags shall be provided at a regular interval of
30M. For cable run shorter than 30M one cable tag shall be provided in the middle.
These tags shall be in addition to end cable tags. The cable tags shall be marked with
cable number, size and voltage grade. Middle tag shall be indicated with destination.
The end tag shall be with second terminal point.
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Cables shall be clamped rigidly at an interval of not more than 1000 mm in horizontal,
and 500 mm in vertical & inclined run and at bends.
Small cables may be bunched together under one saddle provided that in any bunch all
cables have sheaths of the same material. The number of cables shall not exceed four
wide and two deep.
Not more than one cable shall be drawn into one conduit unless otherwise agreed.
After the cable has been drawn in, the conduit shall be sealed by an approved means.
After complete installation of racks and trays etc. it shall be painted with a primer of
red oxide(zinc chromate)and a top coat of finishing paint as approved.
All cables shall be tested for proper insulation before start of laying work.
Cables shall be laid in conduits, racks/trays, cable tunnels/trenches, along with
structures or buildings, as per cable routing drawing and cable list.
Suitable adjustment shall be made in cable routes, if required at site, with a view to
avoid any interference with any part of building, structures, equipment, utilities and
services with the approval of the purchaser.
While laying cables, care shall be taken that kinks, twists or mechanical damage do
not occur to the cable.
All bends in cables shall be made with due consideration to the minimum permissible
bending radius of the cables.
©
Loops shall not be allowed to be formed during the laying of the cables. When being
pulled, the cable shall not be allowed to drag drawing along the ground or over a
second cable already laid. Special care shall be taken while pulling through an opening
where other cables have already been laid. Only approved cable pulling devices shall
be used.
No joints shall normally be made at any intermediate point in through run of cables
unless the length of the run is more than the standard drum length. In such cases
where jointing is unavoidable, the same shall be made inside proper bases having
plastic moulds and shall have moulded epoxy resin construction. Provision shall be
made for earthing continuity at the joint. Cable splicing and jointing shall be done in
accordance with the relevant IS, code of practice and manufacturer's instructions.
Insulation resistance of cables shall be checked before cable jointing.
Adequate length of cables shall be pulled inside the switch boards, control panels,
control desks, etc. so as to permit neat termination.
All cables shall be neatly dressed without interlocking or cross overs. While laying the
cable vertically, these shall be clamped at suitable intervals. Horizontal runs shall be
rigidly secured to trays on racks/hangers in all the places where the direction of the
route changes as well as at cable terminations or joints. The clamps shall not be done
up so tight that the insulation is damaged or deformed.
Cable markers shall be provided on either side of road crossing at each turning and at
30 m intervals at straight runs for underground cables.
Where cables are required to cross roads, surface drains and water, oil, gas or other
pipe lines, they shall be taken through reinforced spun concrete or steel pipes.
Entry of cables from underground to the buildings or trenches shall be through pipe
sleeves. After laying of cables, the sleeves shall be sealed with bitumen or epoxy
compound with sand matting and cement plaster to make them fully water tight.
Special consideration shall be given for protection of cables against chemical and
mechanical damage.
All cable entry openings in the equipment shall be sealed and made vermin proof. All
cable openings in walls and floors shall be sealed after laying of cables by a weak
mixture of asbestos and cement mortar.
All cables shall be provided with identification tags indicating the cable number in
accordance with cable lists. Tags shall be fixed at both ends of the cable and at 15 m
spacing for straight runs as well as on both sides wherever cables are crossing
walls/floors. The tags shall be of aluminium/PVC with numbers punched/painted on
them and securely attached to the cables by non-corrosive wires. The shape of tags
©
shall be round, triangular and rectangular for control, medium voltage and high voltage
cables respectively.
Glanding shall be done for direct entry of both power and control cables into the panels
by the contractor. Compression type brass or aluminium alloy cable glands shall be
used.
The cables shall be terminated in accordance with relevant connection diagram.
Termination and clamping shall be carried out in such a manner as to avoid strain on
the terminals.
All power cable terminations shall be by means of crimping type cable lugs. For
flexible conductors, soldered termination shall be adopted. In case of aluminium power
cables termination on copper bus bars, suitable aluminium copper bimetallic washers
shall be used. Corrosion inhibiting grease shall be used for aluminium cable
terminations. All 1.5 sq.mm screened cable/ 2.5 sq.mm control cable termination shall
be made by crimping using pin / fork type (as decided during engineering stage)
insulated copper lugs. The 1.5 / 2.5 sq.mm copper lugs shall be supplied by the
contractor.
Suitable numbered and coloured letter interlocking type ferrules shall be provided for
end termination of power and control cables. Cross ferruling shall be used for control
termination as far as possible
Control cable entering switch boards, control panels, control desks etc. shall be neatly
bunched and strapped with PVC perforated straps and suitably supported to keep it in
position at the terminal blocks. All spare cores of each cable shall be segregated,
marked spare, neatly dressed and suitably tapped at both ends.
When the cores of two or more multicore cables take a common route in side
equipment, cores of each cable shall be separately bound and the separate bundles
neatly bound together.
Individual cores of control cables shall have plastic interlocked type coloured ferrules
with engraved numbers at both ends of the circuit for identification.
The contractor shall be responsible for correct phasing of motor power connections
and shall interchange connections at the motor terminals box, if necessary, during
each motor is test run.
The trays shall be earthed and rendered electrically continuous by welding the trays to
the grounding strip at not less than two places from both sides of the tray.
The cable accessories shall include end termination kits, straight through joints and
also any special tool and tackles and accessories required for making the
joints/terminations.
©
The straight through joint/termination arrangement shall be complete with all fittings
and consumables. The joint shall have electrical and mechanical withstand capability,
same as that of the associated cable. For all cables, a minimum extra length of 2
metres will be left before jointing.
01 Earthing
Entire system shall be earthed in accordance with the provisions of the relevant IEC
recommendations/ IS code of practice IS 3043-1987 and Indian Electricity Rules, so
that the values of the step and contact potentials in case of faults are kept within safe
permissible limits.
©
Parts of all electrical equipment and machinery not intended to be alive shall have two
separate and distinct earth connections each to conform to the stipulation of the Indian
Electricity Rules and apparatus rated 240 V and below may have single earth
connections.
All shops and buildings as well as the electrical sub-stations and electrical rooms shall
be provided with a ring main earthing system each. Individual ring main earthing
systems shall again be interconnected as a network.
The ring earthing system around each building shall be laid at a distance of
approximately 1.5 m from the building and at a depth of approximately 0.8m. The ring
shall be bonded at intervals to the building steel structures, reinforcement of building
columns and also to pipes, wherever they are crossing. The earth ring shall further be
connected at intervals to deep earthing electrodes to achieve a combined earth
resistance of less than one ohm.
For the purpose of dimensioning the earthing lines/conductors, the duration of the earth
fault current shall be taken as 0.3 seconds.
For different floors in a building, localized ground mats shall be formed and connected
to the ground earthing ring through vertical risers. The earthing mat shall be common
to both power and lighting installations.
For protective earthing separate conductor shall be used for flow of earth fault current
as elaborated below.
The LV side neutrals of the Power distribution transformers shall each be connected to
two separate earthing electrodes. They shall also be connected with the neutral bus of
the corresponding switchgear and the switchgear neutral bus shall be connected to the
earthing ring at two different and distinct points. The fourth core or armour of cables
and all conduits for cables shall also be connected to the earthing mains. A continuous
earth strip shall be run in each side of cable tunnel and in cable ducts and trenches.
The power supply cables (LT) from the sub-station and the distribution cables to
individual motors shall have 4/3.5 cores.
LT power supply cables shall have four cores and the fourth core shall have cross-
sectional area of 50% of the other cores generally. The fourth core of the main supply
lines shall be connected to the solidly earthed neutral bar in the substation switchgear
as well as at the earth bars in MCC/distribution boards.
Separate electonic earthing system shall be provided for all electronic equipment like
PLC"s, weighing panel, computer etc.
©
Earthing scheme to be finalized before basic engineering, in consultation with the client
and approval of OEM.
For equipment ground connections, the minimum conductor sizes used should be as
follows:
02.1 High voltage systems :-
75 x 5 mm GI flat :
02.2 LT system where the voltage does not exceed 650V normally :
Motors and starters upto and including 2.2kW, Light fitting, JBs, etc.
Instruments and miscellaneous small items protected by fuses of ratings not
exceeding 15A.
Motors and starters above 3.7 kW and upto and including 15 kW.
25 x 3 mm GI flat :
50 x 6 mm GI flat :
03 Earthing electrodes:
© !
computers and microprocessor based equipment/ PCs shall be distinct and separate
from the power and lighting equipment earthing system.
Earthing of electrical equipment on cranes and travelling machines:
Every electrical equipment shall have double earthing.
A ring earthing system shall be provided within the crane/machine to which every
electrical equipment shall be connected at least at two places.
The earth ring on the crane/machine shall be connected to the plant earthing system
through the gantry rails. Two sets of earth collector brushes shall be provided on each
side of crane/machine to connect its earth ring to the gantry rails.
Each end of each gantry rail shall be bonded to the plant earthing system.
In addition, intermediate earthing bond shall also be provided on the rails at every 60 m
in case of longer tracks.
Flexible copper bonds shall be provided across any gap in the running gantry rails.
For mobile equipment with flexible cables, one separate copper conductor of adequate
size shall be provided for earthing.
04 Lightning protection
All buildings and plant structures vulnerable to lightning strokes owing to their height or
exposed situation shall be protected against atmospheric flash-overs and lightning
strokes in such a manner as to eliminate any danger to the personnel employed
therein. Stipulations of IS : 2309 - 1969 shall be followed.
A 'Faraday Cage' made of hot galvanised strip steel connected to all buried pipes and
steel structures crossing this cage ring shall be laid around each main building or plant
unit as earthing device. This shall be separate from the electrical equipment earthing
ring main.
All lightning arrestor earth leads of the buildings and plant units shall be connected to
this cage ring.
Air termination network should cover all salient points of the structure. All metallic
chimneys, ducts and the like above the roof of the structure shall be bonded to and
form part of the air termination network. Vertical air termination points shall project at
least 30 cm above the object on which it is fixed.
Down conductors shall follow the most direct path possible between air termination and
earth termination avoiding sharp bends. Down conductor shall have a testing point
adjacent to the earth electrode. Each conductor shall have an independent earth
termination. All earth terminations shall be interconnected.
Earthing electrodes and grid for lightning protection will be distinct separate from the
earthing system for earthing of electrical equipment and at no place will be connected
to other earthing system.
Earthing connection to equipment subject to movement, vibration and shocks, shall be
through flexible stranded conductors.
©
The termination of strips to the equipment shall be done by bolting and the wires shall
be terminated by compression lugs. Jointing of strips shall be done by welding for
proper continuity. All contact surfaces shall be thoroughly cleaned of dust and oil and
after jointing, the joints shall be given bitumen paint.
Earthing conductors laid directly in ground, shall be coated with one coat of bituminised
paints, be wrapped with one layer of bitumaetic tape laid on half lapped and shall have
a final coat of bituminised paint to prevent corrosion.
Earthing conductors run on walls/floors/cable and equipment structures etc. shall be
supported at suitable intervals and painted with black oxide paint.
All joints in the branch connections except at earthing electrode shall be welded and
painted black.
At road /rail crossings earthing strips shall be laid through conduits /concrete ducts.
Special earthing shall be provided for all electronic equipment as per manufacturer's
recommendations / practice.
01 General
A repair network shall be laid to cover all the units/buildings of main technological plant
for providing power to maintenance tools, tackles and telphers.
Welding switch socket outlets shall be provided at every 60m distance in conveyer
galleries and atleast one at every working platform of junction houses. The number of
welding socket outlets for main technological plant units shall be decided based on
requirement, approach etc. Generally the socket outlets shall be provided in such a
manner so that using 30m flexible cable with welding set, total plant area can be
covered. Upto three switch socket outlets can be looped per feeder circuit. Sheet
metal clad switch units shall be provided for feeding power to telphers.
03 Cables
- Outgoing feeders to switch sockets 3.5 x 70 sq. -mm for 100A sockets,
© "
- Outgoing to telphers as per requirement.
01 General
The control rooms shall be provided with air conditioning system. For central control
rooms of standby air conditioners shall also be provided.
Rooms for shift in-charge and office in-charges shall be provided with package AC units.
Necessary safety interlocks shall be provided to stop the fans/AC system in case of fire
and to prevent spread of fire.
Window / package Air conditioners: Energy savers with temperature sensors / Time
switches for switching ON/OFF of compressor motors.
The equipment shall meet the requirement listed in equipment specification under part-I.
All HT/LT substations, switchgear rooms and MCC rooms, cable basement/cellars which
do not house any electronic equipment but contain only electrical equipment, shall be
pressurised with cooled washed air to maintain the room temperature within 45 deg.C
irrespective of outer temperature . This shall match with the duty conditions of electrical
equipment in the rooms. Where a large number of electrical equipment are involved,
adiabatically cooled air washer system shall be provided to maintain room temperature at
40deg.C. Suitable capacity fan and pumps (1W+1S) shall be provided for each unit.
Necessary ducts shall be supplied by tenderer.
The electrical rooms housing electronic equipment, Remote I/Os, electronic weighing
panels including telephone exchange equipment shall be air-conditioned with
pressurisation to maintain the following conditions:
© #
- Room temperature : 30 Deg.C
- Pressurisation : 2-3 mm WC
04 Central Control rooms, Rooms for PLC, Servers, Computers and Level-1/2
automation system equipment.
These shall be ventilated with fresh filtered air to maintain temperature of air at exit so
as not to exceed 45 deg.C and pressurised - ventilation of cable basements and
tunnels shall not be combined with other premises.
Cable tunnel ventilation shall be sectionalised to maximum length of 150m.
Temperature rise shall be limited to 3-5 deg. C above atmospheric dry bulb
temperature subject to a maximum of 45 deg.C at the exit of air from these premises.
Ventilation and air conditioning system shall be interlocked with fire detection system
for safety.
1.02.25 Testing
Test of all equipment shall be conducted as per latest ISS/ IPSS applicable. Tests shall
also confirm to International Standards IEC/VDE/DIN/BS (in case corresponding test
are not mentioned in ISS/ IPSS).
© "
All routine test shall be carried out at manufacturer’s works in the presence of
purchaser or his representative.
The tenderer shall submit type test certificates for similar equipment supplied by him
elsewhere. In case type test certificates for similar equipment are not available, the
same shall be conducted in the presence of purchaser or his representative if
purchaser so desires, without any financial implications to the purchaser.
All the equipment shall be tested at site to know its condition and to prove suitability for
required performance. The site tests and acceptance tests to be performed by
Contractor are detailed below.
The Contractor shall be responsible for satisfactory working of the complete system in
an integrated manner and its guaranteed performance.
.02 Busduct
A. Routine Tests
i) One min. power freq. withstand voltage
© "
ii) Measurement of insulation resistance
iii) Measurement of resistance and reactance of busbars
B. Type Tests
i) Heat run test
ii) Short time rating test (thermal & dynamic)
iii) Impulse withstand test
iv) Tests for degree of protection for enclosures
© "
ii) Temp. rise test of contact
.05 Current Transformer and voltage transformer
A. Routine Tests
i) Assembly inspection
ii) Power-frequency tests on primary windings
iii) Power-frequency tests on secondary windings
iv) Over-voltage inter-turn tests
v) Dielectric test
vi) Ratio & polarity test
vii) Measurement of ratio error & phase angle error
viii) VI characteristics
ix) PT winding resistance
x) Final documentation check
B. Type Tests
i) Short-time current test
ii) Temperature rise test
.06 Final Test of Materials of Grounding and lightning system
i) Visual check
ii) Dimensional check
iii) Accessories fitting check
iv) Mechanical and electrical test (where applicable)
v) Final documentation check
07 CABLES
1. Shop Tests
B. PACKING
1. Cables will suit barrel diameter and securely clamped/fixed. The barrels must
be sufficiently strong to withstand mechanical shocks and shall effectively
protect against transit.
© "
2. Both ends of cable will be metal capped to prevent moisture ingression.
Ends shall be kept inside the cable drum in a manner so that these are
accessible for testing.
a) Makers name
b) Consignee’s full address
c) Type size and length of cables
d) Net and gross weights
e) Any other marking for shipping
f) Drum Markings
C. Drum Lengths
2. For 90% cable drum of each item of cable permissible tolerance is in length
+ 5% For 10% balance cable drums, Contractor shall ensure that each 500
m capacity drum contains at least 250m and each 1000m capacity drum
contains at least 500m cable lengths. Overall tolerance for each item of
cable is + 1% of total length.
08. Motors :-
A. Routine Tests
The following are the routine tests carried out on each and every motor :
1.0 Measurement of resistance.
2.0 Insulation resistance test .
3.0 Motors are tested at 1/3 times the rated voltage for checking the ability of the
motor to run upto full speed , when switched in either direction .
4.0 No load test .
5.0 High voltage test .
B. Type Tests
1 Measurement of rotor resistance .
2 No load test
3 Locked rotor test .
4 Full load reading of voltage, current , power input and slip.
5 Temperature rise test.
6 Momentary overload test .
7 Insulation resistance test .
8 High voltage test .
9 Polarisation index test (for HT motors)
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09 SITE TESTS AND CHECKS
001 General
All the equipment will be tested at site to know their condition and to prove suitability for
required performance.
The test indicated in following pages will be conducted after installation. All tools,
accessories and required instruments will have to be arranged by contractor. Any
other test that is considered necessary by the manufacturer of the equipment,
Contractor or mentioned in commissioning manual has to be conducted at site.
In addition to tests on individual equipment some tests / checks are to be conducted /
observed from overall system point of view. Such checks are highlighted under
miscellaneous tests but these will not be limited to as indicated and will be finalised
with consultation of client before charging of the system.
The Contractor will be responsible for satisfactory working of complete integrated
system and guaranteed performance.
All checks and tests will be conducted in the presence of Client’s representative and
test results will be submitted in six copies to Client and one copy to Electrical Inspector.
Test results will be filled in proper proforma.
After clearance from Electrical Inspector, system / equipment will be charged in step by
step method.
Based on the test results clear cut observation will be indicated by testing engineer with
regard to suitability for charging of the equipment or reasons for not charging are to be
brought by the Contractor.
IR test on each winding to ground and between winding and check for polarization index.
1
Turns ratio test on each tap
2
Polarity and vector group test
3
Measurement of winding resistance for windings by Kelvin bridge.
4
Heating and drying and checking with heating and cooling curve.
5
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Checking of earthing wrt transformer tank (flexible from top cover to tank) other parts,
6
neutrals and tank to electrodes of LAs (for LAs located near transformer)..
Testing of Buchholtz relay for alarm and trip conditions
7.
For bushing CTs, tests applicable will be as for current transformers.
8.
Calibration and setting of oil/winding temperature indicators, level gauge
9.
Check insulators for cracks.
10
Checking for oil leakage and arresting of leakages (if required)
11
Checking of operation of all valves.
12.
Checking of open operation of all valves (except drain and filter set)
13
Filtration of oil by using line filter and heater set
14
BDV test on Oil samples from top & bottom
15
Checking of Oil for acidity, water content and tan delta as per IS 335.
16
Measurement of magnetising current and no load loss.
17.
Checking of silica gel breather.
18.
Checking of noise level at no load and at full load.
19.
Checking of air circulation conditions for indoor transformers.
20.
Conducting magnetic balance test.
21.
Checking of other points given in manufacturer’s commissioning manuals.
22.
IR, wiring and operational tests on all control devices in control cabinet, oil level indicator
23.
winding and oil temp. indicators, oil pump, cooling fan etc.
HT ISOLATOR
© "!
Check working of shunt trip (if applicable)
8.
Checking of CTs, PTs (if applicable) as per the details given in HT board.
9.
Contact resistance/ millivolt drop test
10.
LT SWITCHBOARD
1. IR test
2. HV test with 2.5 kV megger
3. Functional test for all feeders
4. Testing and calibration of all meters
5. Checking and calibration of overload relays and protective relays by primary injection
method.
6. Check operation of contactors from local and remote points.
7. Checking of interlocking between incomers/ bus couplers and other feeders
8. Test of prove interchangeability of similar parts.
9. Test to prove correct operation of breakers at minimum and maximum specified control
voltages.
10. Checking operation of RC circuit (if there) for tripping of circuit breaker after
disappearance of control voltage.
11. Checking of earthing connection for neutral-earth bus, cable armour, location of E/F CT
etc. as per the scheme.
12. Checking of tests, service and drawout position of all the breakers and operations of
mechanical flag indicator and electrical indication lamps.
13. Checking the functioning of various electrical schemes like auto change over, signaling
etc.
14. Contact pressure test
BUS DUCTS
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Checking for inspection openings and accessibility for replacement of insulator etc.
8.
Check tightness of earthing connections on enclosure.
9.
Checking of silicagel breather (if there).
10.
Checking of working of space heater.
11.
Hot air blowing to remove moisture if required.
12.
Cables
Visual check
1.
Checking of continuity and IR values for all the cables before and after HV test.
.2
HV test and measurement of leakage current after termination of cable kits (for HT
.3
cables).
Checking of earth continuity for armour and fourth core (if applicable)
.4
Check for mechanical protection of cables.
.5
Check for identification (tag number system) distance placement of cable marker, cable
.6
joint etc. as per the cable layout drawing.
Check earthing of cable structures.
.7
Check safe head room in tunnel and basement area.
.8
Check clearance from ventilation duct and light fittings for cable structures.
.9
Check proper fixing of cable structures.
.10
Check for proper drainage and removal of water (if any).
.11
Lightning Protection
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Measurement of earth loop resistance for E/F path of biggest LT drive.
.5
Miscellaneous
APPENDIX
TABLE - I
SELECTION OF POWER COMPONENTS & WIRING FOR CONTINUOUS DUTY CAGE MOTOR
DRIVES
Motor rating at S1 Minimum rating Minimum rating Minimum size of Minimum size of
duty (kW) of MCCB in of Power Cu wire / flat in sq. Power cable (Al.)
Amps (AC23) contactor Amps mm for internal termination in
(AC3) power connection sq.mm.
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Up to 3.7 (DOL) 32 32 4 4x2.5 Cu.
Up to 3.7 (RDOL) 32 32 4 4X2.5 Cu.
5.5 32 32 4 4X6
7.5 63 32 4 4X6
11 63 45 6 4X10
15 63 45 10 4X16
18.5 63 70 16 4X35
22 125 70 16 4X35
30 125 110 35 3.5X50
37 125 110 35 3.5X50
45 250 170 50 3.5X95
55 250 170 70 3.5X120
75 250 250 95 3.5X185
90 250 250 30X5 Flat 2(3.5X120)
110 400 400 30x5 Flat 2(3.5x120)
125/132 400 400 30x5 Flat 2(3.5x120)
160 400 630 40x5 2(3.5x185)
180/200 630 630 30x10 3(3.5x185)
1.02.27 ILLUMINATION
1.0 General
The lighting system inside and outside plant units are designed based on the desired
illumination levels recommended by IS and the practices followed in industries,
architectural arrangement, building dimensions including mounting height, environmental
considerations, ease of maintenance and reliability of the lighting distribution network.
2.0 The illumination system shall be designed as per IS:3646-1992. The level of illumination,
type of fittings, maintenance factor to be considered is as given below:
© #
complex and cable tunnels / suitable for 70W HPSV lamps, similar to
cellars Philips type SDL-23/70 or equivalent
Pump house - do - 200 0.6
Flood lighting Weather proof flood light fittings for 70 0.5
1x400W HPSV lamps Philips type
H/SVF12 or equivalent
Pipeline tunnel Industrial fittings for 24V, 2x50W halogen
lamps “Sigma” make deck lights or eqvt.
Casting Bay High bay HPSV industrial incandescent 200
(1000 W) equivalent to HDK /SDK of
PHILLIPS make
Conveyor Houses / Fluorescent / incandescent industrial type 70 to
conveyor gantries / junction fitting equivalent to TPW / NXC of 100
houses PHILLIPS make
Aviation obstruction Aviation obstruction light fittings, flame
retardant type consisting of multi ultra high
intensity 60 mscp LED module, without
flashing module, steady in red colour,
having omni directional capability and
shall be suitable to deliver maximum light
output in the zone between 70° above and
10° below the horizontal with a maximum
of condition at 20° above the module.
Illumination: Electronic ballast having third harmonic distortion less than 6 % and total harmonic
distortion less than 12 % with high luminous tube lights are to used. Time switches, reduced
voltage controllers, group solar lighting sections for remote areas shall be provide wherever
feasible. Lighting Fixtures and Accessories shall be energy efficient
© #
Group - A1 Important traffic road 30 Cut off / semi cut 0.6
carrying fast traffic off
MF : Maintenance factor
The light fittings shall be complete with all accessories like electronic ballast, reflector etc.
External area lighting including street/road lighting / tower lights shall be fed from MLDB through
separate SLDB located at suitable places. Automatic switching ON/OFF of these circuits shall be
done through timers. Flood light towers shall be fed through 415/240V, 3 phase, 4 wire circuit with
individual fittings distributed at 240V, single phase, with control and protection located at bottom
of each tower. Rewireable fuse in a sheet steel box shall be provided near each fitting to facilitate
removal of lamp in off position.
In high bays walkway shall be provided for maintaining light fittings. At other places suitable
ladder/platform/approach shall be provided for maintaining/replacement of light fittings.
B. Power distribution
1.0 The distribution of lighting power supply for the individual areas shall be done at 415V, 3 phase,
4 wire bus system through Main Lighting Distribution Boards (MLDB) for the area. The MLDB
shall be fed through a lighting transformer . The outgoing feeders of the MLDB shall feed the
required numbers of Sub Lighting Distribution Boards (SLDB) for lighting. Each SLDB shall
receive power at 415V AC, 3 phase, 4 wire and distribute it into 240V, 1 phase circuits for
connection to the lighting fixtures and 240V receptacles. The SLDB shall be located in the
rooms, bays etc. covering the respective zone. The SLDB shall be located in the electrical
rooms in the respective area.
In case of indoor illumination, separate lighting circuit shall be provided as emergency lighting
circuit. Emergency lighting circuit shall be through emergency MCC/PDBs so that in case of
failure of power in lighting DBs circuit, these lights can continue to glow. 20% lights shall be
connected to this circuit. Balance lights shall be connected through lighting circuit.
Portable Emergency lighting including built-in battery, battery charger & lamps shall be provided
in strategic areas like control rooms, staircases, entry of cable tunnels/basements, escape
routes, etc. for safety.
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Flood lights for area lighting shall be mounted on towers/poles or building structures. Tower
height shall be kept to an average of 22m.
Street/road lighting and boundary wall lighting shall be provided with HPSV/fluorescent lamp
fittings mounted on poles of 9m to 11m height.
Neon aviation obstruction lights shall be provided on chimneys and other such tall installations
as per regulation. M/S Binay or equivalent make aviation obstruction lights( LED type ) shall be
provided . For street lighting necessary control gear shall be provided for reduced voltage
running during off peak traffic for energy conservation .
C. SPECIFICATIONS :-
1 Lighting Transformer
A. General
1.0 Type - Metal clad .
- Non drawout type.
2.0 Construction - Modular construction .
- Fully compartmentalized with metal / insulating
material partition.
3.0 Enclosure class IP52
4.0 Type of execution Single front.
5.0 Mounting - Floor mounting.
- Free standing with ISMC 75.
6.0 Installation Indoor.
B. Constructional Features :-
1.0 Sheet steel
Thickness - 2 mm for load bearing members.
- 1.6 mm for non load bearing members.
Material CRCA
2.0 Cable entry - Incomer :- Bottom cable entry.
- Outgoing :- Bottom cable entry.
3.0 Design - Separate bus alley and cable alley on opposite side of
the outgoing modules .
© #
- All the components shall be accessable from front .
- Each module to have covering at the bottom.
4.0 Interlocking & protection - Module door interlocked with main power isolating
devices.
- Power circuit isolation device to have pad locking in
the OFF position with door closed.
5.0 Operating height - Minimum :- 300mm
- Maximum :- 1800 mm.
6.0 Gland plate Undrilled removable bottom gland plates
(3 mm thick)
7.0 Miscellaneous - Neosprene rubber gasket shall be provided for all the
doors , removable covers & between adjacent
covers .
- Lifting hooks for the panel .
- Doors shall have concealed hinges .
8.0 Labelling Clear legible identification labels (anodized aluminium
with white letters engraved on black background ) with
letter sizes of :-
- 25-50 mm for MLDB panel
- 5 mm for components and module name plates.
- Danger board on front and rear sides in English ,
Hindi and local language .
9.0 Earthing - Two separate earthing terminals will be provided.
- Bolted joints with tooth spring washers for good earth
continuity.
- Earth bus to run in all cable alley of the panel .
10.0 Shipping length To be limited to 2.4 M.
11.0 Limiting dimensions - Width of MLDB :- 2400 mm
- Depth of MLDB :- 500 mm
- Width of Cable alley :- 300 mm
- Width of Bus alley :- 300 mm
- Height of module :- 400 mm (min)
12.0 Paint shade Shade No. 631 as per IS-5:1992.
C. Busbars
(i) Main horizontal & vertical busbars
1.0 Arrangement Three phase & neutral.
2.0 Material High conductivity electrolytic aluminium alloy confirming
to grade E91E as per IS-5082 –1981.
3.0 Phase Busbar Rating - Shall be able to carry continuously the connected
load (considering all derating factors) plus a 25%
margin .
- Max. current density shall be
- 1.0 A/sq.mm for Aluminium
- 1.5 A/sq.mm for Copper .
4.0 Neutral Busbar Rating 50 % of phase busbar rating
5.0 Short circuit rating 50 KA for 1 sec.
6.0 Busbar configuration Red-yellow-blue from front to back or top to bottom or
left to right as viewed from front.
7.0 Busbar insulation Heat shrinkable PVC
- R,Y,B coloured sleeves for phases
- Black for neutral.
8.0 Busbar supporting - Non-hygroscopic
insulators - Flame retarded
© #
- Track resistant
- High strength
- Sheet moulded compound or equivalent polyster
fibre glass moulded type .
9.0 Max. temp. rise of bus Not to exceed 35 deg. C. above ambient of 50 deg.C.
10.0 Air clearance for bare Phase to phase :- 25.4 mm (minimum)
busbar Phase to earth :- 19.0 mm (minimum)
11.0 Joints and tap off points - Busbar joints and tap off points shall be shrouded
and bolted ( with cadmium coated bolts with plain
and spring washers and locknuts).
- Bimetallic connectors for connection between
dissimilar metals .
- Antioxide grease for all bus connections .
12.0 Neutral bus isolation Through disconnecting link .
13.0 Vertical busbar Rear side
(ii) Earth bus
1.0 Material GI.
2.0 Size Minimum 50 x 6 mm with extension at both ends .
(iii) Control bus
1.0 Material Copper.
2.0 Size Minimum 25 x 3 mm .
D. Insulation level
1.0 Rated insulation voltage 1100 V
2.0 Impulse withstand voltage 4 KV as per IS-13947 (Part I) 1993
3.0 One minute power 2.5 KV for power circuit & 500 V for control circuit
frequency withstand voltage
E. Pollution Degree
1.0 Pollution Degree Pollution Degree 3
as per IS-13947 (Part-1) : 1993 ;
unless otherwise stated
F. Feeder arrangement
Incomers
1.0 Isolating Equipment 3 pole MCCB (for rating upto 630 A)
(with E/F protection).
2.0 Quantity Two incomer
3.0 Autochangeover - Through contactor logic with suitable timer.
- Normally only one Incomer shall be ON .
4.0 Indication Lamps LED type indicating lamps for :-
- MCCB ON/OFF/TRIP.
- Power ON R / Y / B .
5.0 Meters and selector - 144 sq.mm size voltmeter with 7 position selector
switches switches
- 144 sq.mm size ammeter with 4 position selector
switches
© #
G. Panel wiring
1.0 Power / current transformer 1.1Kv grade single core , black colour PVC insulated ,
circuit stranded copper conductor of minimum size 2.5
sq.mm.
2.0 Ferrules - Numbered plastic/ceramic ferrules.
- Self locking type.
3.0 Marking - Wiring will be properly marked as per relevant IS.
4.0 Terminals - Power & control terminals shall be segregated by
insulating material like hylam / bakelite sheet.
- Power terminals will be stud type.
- Control terminals will be ELMEX type suitable for
connecting two cores of 2.5 sq.mm wires.
- Minimum 20 % spare terminals will be provided.
- The minimum rating of control terminal shall be 10
Amps.
5.0 Cable glands Double compression cable glands for receiving external
power and control cables
© #!
- Doors shall have concealed hinges .
6.0 Labelling Clear legible identification labels (anodized aluminium
with white letters engraved on black background ) with
letter sizes of :-
- 5 mm for components and module name plates.
- Danger board on front and rear sides in English ,
Hindi and local language .
7.0 Earthing Two separate earthing terminals will be provided.
8.0 Limiting dimensions - Width of SLDB :- 800 mm
- Depth of SLDB :- 300 mm
- Height of SLDB :- 400 mm (min)
9.0 Paint shade Shade No. 631 as per IS-5:1992.
C. Busbars
1.0 Arrangement Three phase & neutral.
2.0 Material High conductivity electrolytic aluminium alloy confirming
to grade E91E as per IS-5082 –1981.
3.0 Phase Busbar Rating - Shall be able to carry continuously the connected
load (considering all derating factors) plus a 25%
margin .
- Max. current density shall be
- 1.0 A/sq.mm for Aluminium
- 1.5 A/sq.mm for Copper .
4.0 Neutral Busbar Rating 50 % of phase busbar rating
5.0 Short circuit rating 50 KA for 1 sec.
6.0 Busbar configuration Red-yellow-blue , black for neutral .
7.0 Busbar insulation Heat shrinkable PVC
- R,Y,B coloured sleeves for phases
- Black for neutral.
8.0 Busbar supporting - Non-hygroscopic
insulators - Flame retarded
- Track resistant
- High strength
- Sheet moulded compound or equivalent polyster
fibre glass moulded type .
9.0 Air clearance for bare Phase to phase :- 25.4 mm (minimum)
busbar Phase to earth :- 19.0 mm (minimum)
F. Feeder arrangement
Incomers
1.0 Isolating Equipment 3 pole ELCB
ELCB shall be of AC 23 duty category conforming to IS:
13947-1993 having fully shrouded contacts.
2.0 Quantity One
3.0 Indication Lamps LED type indicating lamps for :-
- Power ON R / Y / B .
Outgoing feeder arrangements
1.0 Circuit breaker DP MCB
G. Panel wiring
1.0 Power / current transformer 1.1Kv grade single core , black colour PVC insulated ,
circuit stranded copper conductor of minimum size 2.5
sq.mm.
2.0 Ferrules - Numbered plastic/ceramic ferrules.
- Self locking type.
3.0 Marking - Wiring will be properly marked as per relevant IS.
© #
4.0 Terminals - Power & control terminals shall be segregated by
insulating material like hylam / bakelite sheet.
- Terminals shall be ELMEX type suitable for
connecting two cores of 2.5 sq.mm wires.
- Minimum 20 % spare terminals will be provided.
- The minimum rating of control terminal shall be 10
Amps.
5.0 Cable glands Double compression cable glands for receiving cables .
© #"
All socket outlets will be supplied with heavy-duty type
plug and cap with chain.
4.0 Isolation Switch rotary type switch mounted flush in the socket outlet
box.
The isolating switches will be manually operated
industrial type of category AC 22.
5.0 Protection Operating handle of the rotary switch will be fixed in
such a manner that it will not be possible either to insert
or withdraw the plug without switching off the supply.
6.0 Cable entry Suitable for cable entry through 20mm dia. conduit.
7.0 Mounting Wall / column mounting
8.0 Inscription Inscription plate will be provided indicating the voltage
and current rating of the switch socket outlet.
9.0 Miscellaneous In hazardous area, flame proof switch socket outlet will
be provided.
© ##
from the same SLDB and shall run along with the phase conductor throughout the length of
the cable run upto the luminaires.
02 All lighting cables for the entire complex shall be PVC insulated with copper conductors .
C. Lighting Fixtures and Accessories
01 All the luminaires will be designed, manufactured and tested in accordance with the Indian
Standards in so far as they are applicable. Lighting Fixtures and Accessories shall be energy
efficient
02 All the luminaires will be industrial type. Specification for the various types of sodium vapour
and fluorescent fittings mentioned in the schedule of quantities will be followed. All the
lighting fixtures will be complete with all parts along with lamps/tubes, control gears and
accessories for installation and efficient performance whether specifically mentioned in the
specification or in the schedule of items or not.
03 Individual light fittings will be provided with suitable gland arrangements for 3x2.5 sq.mm
armoured copper cable entry unless otherwise specified. Terminals of all fittings will be
suitable for taking 3x2.5 sq.mm, copper conductor PVC insulated and PVC sheathed cable.
04 All fittings will be supplied with all interconnections made and fully wired upto the terminal block.
05 All live parts will be provided with suitable sleeves to prevent accidental contacts. The earthing
terminal in the fitting will effectively earth the body of the entire luminaire.
06 Dust and vapour tight fittings will have the enclosures suitably designed to withstand the heating
effect.
07 The fixing arrangement of various components and lamps will be in such a way that the
maintenance and replacement jobs can be easily carried out.
08 All flameproof equipment will be provided with flameproof plugs.
09 Flame proof fittings and control gearboxes will be provided as per relevant IS in hazardous
area.
D. ILLUMINATION FITTINGS
1.0 OUTDOOR LIGHTING FITTINGS.
All road lighting fittings will be mounted on steel tubular poles with single/ double or triple
outreach brackets having sodium vapour lamps. The fittings will be cut-off / semi cut-off
distribution and integral type.
For lighting of open areas self-supporting steel towers shall be provided with flood light fittings
and sodium vapour lamps.
2.0 FLUORESCENT FITTINGS
2.01 DECORATIVE FLUORESCENT LIGHT FITTING
Decorative type fluorescent tube light fitting complete with stove enamelled mounting rail,
polyester filled ballast, spring loaded rotor lamp holders, starter holder and starter, power
factor correction condenser to improve the power factor to 0.95 and acrylic diffuser. Provision
will be made for mounting the fitting end to end in continuous row and/or for mounting
individually using high impact black polystyrene end plate. All the fluorescent tube lights
fixtures shall have electronic ballast having third harmonic distortion less than 6% and total
harmonic distortion less than 12 % .
2.02 INDUSTRIAL TYPE FLUORESCENT LIGHT FITTING
©
The fitting will have channel and reflector made of CRCA sheet steel with white cover plate.
Channel and reflector will be finished with light Grey stove enamelled outside and white stove
enamelled inside. The fitting will be complete with all electrical accessories like polyester filled
ballast, starter, spring loaded rotor lamp holders, starter holder, power factor improvement
capacitor to improve the power factor upto 0.95 etc. All the fluorescent tube lights fixtures shall
have electronic ballast having third harmonic distortion less than 6% and total harmonic
distortion less than 12 % .
All types of fluorescent fittings will be suitable for mounting on wall/ceiling/conduit suspension.
2.02.1 WELL GLASS FITTINGS
Well glass lighting fitting will be fitted with sodium vapour or mercury vapour lamps. These
fittings will be suitable for hanging by means of hangers, brackets, hooks etc. as required. All
fittings will be integral type.
2.02.2 FLOOD LIGHT FITTING
• Sodium vapour flood light fittings are required for area lighting as specified in schedule of
quantities.
• The Flood light fitting will be weatherproof and suitable for outdoor duty. The
housing/enclosure will be of die cast Aluminium alloy and finished with hammertone Grey.
The enclosure of the luminaries will be provided with a flat toughened glass in the front.
Adequate gasketting will be provided with synthetic rubber for making the luminaries
completely weatherproof. The fitting will be provided with facility to position the luminaries
for effective lighting at the target area. The fitting will also be provided with graduated
protractor to aid accurate aim and ensure a con-trolled light distribution.
• High quality polished Aluminium will be used in the reflector to ensure powerful light beams.
The reflector will be anodised to enhance the longevity and contoured in multiple segments
for optimum optical performance. The fitting will be provided with GES porcelain lamp
holder. The control gear housing (separate control gear-non-integral type) will be housed
with copper wound ballast, perfected improvement capacitor and terminal block. An
electronic igniter will be provided in the luminaries.
• All the control gear components will be pre-wired in all respects and terminated to the
terminal block for incoming cables. The fitting will be provided with earthing terminal and
wiring will be done by multi-strand copper conductor. All the fasteners will be electroplated
and passivated. The fitting will be suitable for twin/Single 400 watts HPSV lamps.
2.02.3 STREET LIGHT FITTING
• Street light fittings will be suitable for outdoor duty in weatherproof, single piece die cast
Aluminium enclosure, finished with epoxy paint outside and stove enamelled inside. The
fitting will be provided with GES porcelain lamp holder, and anodised Aluminium reflector
with facility for obtaining cut off as well as semi-cut off light distribution. These will also be
provided with high transparency clear acrylic cover with neoprene rubber gasket to make
them absolutely dust and weather proof. Control gear compartment will be provided with
detachable CRCA steel, pre-wired with ballast, capacitor, igniter and terminal blocks for
incoming supply, Fittings will be provided with earthing terminals and wiring will be done
with multi-strand copper conductor.
• All the fasteners will be electroplated/passivated and mounting arrangement will be suitable
for direct mounting on poles having maximum 65 mm. OD with provision for holding the
pipe in extended portion of control gear by means of clamps
2.02.4 FLAME PROOF FITTINGS
©
Flame proof type fittings will be well glass type luminaries suitable for use with HPLN 250W
(High pressure Mercury Vapour) lamp with separate control gear complete with copper
ballast, power factor improvement capacitor, terminal block enabling loop-in-loop out
connection. Both fittings & control gear will be of cast Aluminium alloy LM6 or cast iron
stove enamel, Grey hammertone finish outside and white inside.
The control gear box and enclosure for fittings will have certification from CMRS, Dhanbad
and will be suitable for gas groups IIA & IIB as per IS 2148-1981. The fittings will be
designed as per IS 2206 (Part-I) -1987. The material for cable gland will be brass/stainless
steel/aluminium alloy LM6 and will be double compression type suitable for indoor/outdoor
use. These are must for every flameproof fittings and accessories.
©
The street light poles of 9M height will be conforming to: 410-SP-29
The street light poles of 7M height will be conforming to : 410-SP-3
All erection consumables like bricks, sand, cement stone chips etc. for foundation of poles
will be supplied & erected
©
At the top docking position, combined guides and stops will ensure concentricity between
the lantern carriage and the masthead. The stops will also help to ensure proper levelling
and positioning of the lantern carriage at its top position. All the lower docking position, the
lantern carriage will rest firmly at a maintainable height from the ground level with the help
of stoppers for ease of maintenance.
During lowering/raising operation the design will ensure that there is no damage caused to
the mast surface and any other parts installed.
4.05 Winch Assembly
The winch will be self sustaining and self lubricating type specially designed without the
need of breaks, springs or clutches, and will consist of two drums fabricated from steel with
machined grooves and mounted inside the mast at a convenient height from the base.
The wire rope will be wound on the drum with one end attached to the lantern carriage
while the other end is clamped to the winch drum. The design will ensure no inter winding
of the fitting ropes.
At least four turns of rope will remain on the drums when the lantern carriage is fully
lowered.
4.06 Support Ropes
The support ropes will be of stainless steel and will be capable of safely handling the
lantern carriage load.
4.07 Supply cables.
Power supply cables will be class B insulated with required number of cores provided with
multi-pin heavy duty locking type male/female connectors at the end. Pulley assembly will
accommodate extra cable for emergency supply.
Test load will be of 5-meter length 5-core 2.5-mm2 copper conductor cable with multi-pin
heavy duty locking type male/female connectors at the ends. Under no circumstances the
test lead will travel through the mast.
4.08 Foundation
The design and construction of foundation for high mast lighting tower will be included in
the scope of the contractor. The contactor will consider the following indicative data as
design parameter for high mast. However the actual data will be indicated during tender
scrutiny.
a) Soil bearing capacity at 1-Metre depth :- As per data supplied by Purchaser (BSP)
b) Wind speed :- As per data supplied by Purchaser (BSP)
c) The Contractor will submit the design drawings for approval of MECON for high mast
based on soil bearing capacity and wind speed. The Contractor will be responsible for
safe & efficient erection of the mast.
4.09 Electric Drive & Fittings
The drive will be 3 phase, 415 volt, 50 Hz, class B insulated, flameproof type induction
motor/geared motor with suitable torque limiter.
The motor will be mounted on MS hot dip galvanised plate inside the mast with a possibility
of adjusting its position. The drive will be capable of taking the load of whole lantern
carriage with luminaries, control gearboxes, aviation obstruction light mounted on it.
Manual handle will be supplied along with power tool for operating the winch manually in
case of power failure. Reversible type starters for motor, contactors for lighting circuit, MCB
isolator switch etc. will be provided in a flame proof & weatherproof enclosure.
©
4.10 Light Fittings
The light fittings will be of flood light type with twin 400-watt HPSV lamps. The quantity,
mounting position/angle and optical characteristics will be decided on the basis of the
following illumination requirement.
Minimum 30 lux illumination will be achieved at a horizontal distance of 30 meters from the
bottom of the mast all around. Illumination level of 10 lux will be sufficient at plant boundary
wall , parking area, Administrative Building, etc. Minimum of 3-5 lux is required to be
achieved at a horizontal distance of 125 Metre from the bottom of the mast towards all
area. Minimum 20 lux will be achieved in the areas adjoining at the perimeter of 40 meter
(approx.) radius considering the mast base at the centre.
All lighting performances will be checked holding the lux meter in horizontal plane at ground
level.
©
FORM NO. 11.20 (DQM) F-09, REV-0
INSTRUCTIONS FOR FILLING UP : CODES FOR EXTENT OF INSPECTION, TESTS, TEST CERTIFICATES & DOCUMENTS :
1 QAP shall be submitted for each of the equipment separately w ith break Code Description Code Description Code Description DOCUMENTS :
up of assembly / sub-assembly & part/component or for group of equip-
ment having same specification. 1. Visual(Welding etc.) 19. Sponge test 34. Internal Inspection report D1. Approved GA draw ings
2. Dimensional 20. Dust/Water Ingress test by Contractor D2. Information and other reference
2 Use numerical codes as indicated for extent of inspection & tests and 3. Fitment & Alignment 21. Friction Factor Test 35. Hardness test drg / stamped drgs released
submission of test certificates & documents. Additional codes & des- 4. Physical Test(Sample) 22. Adhesion Test 36. Spark test for Lining for manufacture
cription for extent of inspection & tests may be added as applicable for 5. Chemical Test (Sample) 23. Performance Test/ 37. Calibration D3. Relevant catalogues
the plant and equipment. 6. Ultrasonic Test Characteristic curve 38. Safety device test D4. Bill of Material/ item no./
7. Magnetic Particle Test(MPT) 24. No. Load/Free Running Test 39. Ease of Maintenance identification.
3 Separate identification number w ith quantity for equipment shall be 8. Radiography test 25. Load/Overload Test 40. Thickness measurement D5 Matchmark details
indicated w herever equipment having same specification belonging to 9. Dye Penetration Test 26. Measurement of speeds of Zinc coating D6 Line/Layout diagram
different facilities are grouped together. 10. Metallographic Exam. 27. Accoustical test D7 Approved erection procedures
11. Welder's Qualification & 28. Geometrical Accuracy D8 Unpriced sub P.O.w ith
4 Weight in tonnes (T) must be indicated under column 5 for each item. Weld Procedure Test 29. Repeatability and Positioning specification and amendments
Estimated w eights may be indicated w herever actual w eights are not 12. Approval of Test and Repair Accuracy if any
available. Procedure 30. Proving Test D9. Calibration Certificate of all
13. Heat Treatment 31. Surface Preparation measuring instrument and
ABBREVIATIONS USED : 14. Pressure Test 32. Manufacturer's Test Certificates gauges.
15. Leakage test for bought out items D10. Ordering Specification
CONTR : CONTRACTOR 16. Balancing 33 IBR/Other statutory agencies'
17. Vibration Test compliance certificate
MFG : MANUFACTURER 18. Amplitude test
1 QAP shall be submitted for each of the equipment separately w ith break Code Description Code Description Code Description DOCUMENTS :
up of assembly / sub-assembly & part/component or for group of equip-
ment having same specification. 1. Visual 14. Impalse Test. D1. Approved GA draw ings
2. Dimensional 15. Partial Discharge Test. D2. Approved single line /
2 Use numerical codes as indicated for extent of inspection & tests and 3. Fitment & Alignment 16. Heat run test/Temp. rise Test. schematic diagram.
submission of test certificates & documents. Additional codes & des- 4. Physical Test(Sample) 17. Enclosure protection Test. D3. Catalogues / Approved data sheet
cription for extent of inspection & tests may be added as applicable for 5. Chemical Test (Sample) 18. Calibration. D4. Approved bill of materials.
the plant and equipment. 6. Ultrasonic Test 19. Noise & Vibration. D5. Unpriced P.O. copy.
7. Magnetic Particle Test(MPT) 20. Test Certificates for bought D6. Calibration Certificate of all measuring
3 Separate identification number w ith quantity for equipment shall be 8. Radiography test out components. instrument and gauges
indicated w herever equipment having same specification belonging to 9. Dye Penetration Test 21. Tank pressure Test.
different facilities are grouped together. 10. Measurement of IR Value : 22. Paint shade verification.
a) Before HV Test 23. Short time rating.
4 Weight in tonnes (T) must be indicated under column 5 for each item. b) After HV Test 24. Operation & functional
Estimated w eights may be indicated w herever actual w eights are not 11. High voltage test/Dielectric check.
available. test. 25. Overspeed Test.
12. Routine test as per relevant 26. Flame proof Test
ABBREVIATIONS USED : IS/other standard. 27. Clearance and creepage
13. Type tests as per relevant IS/ distance.
CONTR : CONTRACTOR other standard. 28. Acceptance Tests
as per relevant IS
MFG : MANUFACTURER
01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply/fabrication of Air Conditioning System with all accessories required to be installed for
HVAC application to achieve desired performance in all respect. Specific technical requirement of
Air Conditioning System if any shall be mentioned in the job specification/data sheet as furnished
along with the Technical Specification.
Brief description of Air Conditioning System is given below under clause No. 02. The point wise list
of data to be furnished by the tenderer along with the offer is mentioned below under clause No. 03.
02. Description
This specification specifies general requirement of refrigeration and air-conditioning system for different
application.
In general following types of air – conditioning units and accessories are required to be installed:
Design Consideration:
For Design Ambient Temperature, internal heat load due to equipment, lighting, solar radiation,
occupancy and inside design conditions refer job requirement of technical specification. The air-
conditioning system will be designed to operate continuously round the clock twenty four (24) hours a
day for all seasons of the year.
Following Indian Standards shall be followed for designing Air Conditioning System:
© 2007 MECON Limited Air Conditioning, Ventilation & Air Pollution Control System GS-08
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Page 1 of 104
General Technical Specification
The following design data shall be considered for selecting and sizing various equipment for chilled
water plant, air conditioning and ventilation systems :
In general the different air conditioned served electrical premises shall be maintained at 23+2 C and
55+5 % RH.
All glasses in Air-conditioned served premises shall be double glass type with airtight double door entry
provision .
For improved water quality in refrigeration system chemically treated water shall be considered as
make-up for corrosion protection. Alternatively soft water plant shall be installed for make-up water
supply to A/c system .
© 2007 MECON Limited Air Conditioning, Ventilation & Air Pollution Control System GS-08
All rights reserved
Page 2 of 104
General Technical Specification
For better distribution of chilled water in the network, ring main shall be considered. Alternatively
reverse return line shall be considered for vertical chilled water distribution at different floor. At the
end of main supply and return chilled water line provision shall be kept with isolation valve for
hooking up with adjacent plant chilled water network. Interfacing of chilled water network form one
plant to other shall be done by Purchaser separately depending upon equirement.
3
Preferable Exhaust fan rpm shall not exceed 900. All pumps ( above 15m /hr capacity) shall be
horizontally split type with maximum RPM of 1,500. Monoblock pump can be used for capacity less
than 15 m3/hr
Remote monitoring from central control room through main automation system for all critical areas
under AC systems shall be provided . Provision for monitoring of chilled water flow quantity ,
temperature and served premises temperature shall be kept from central control room station .
Chilled water plant shall be selected such that it shall have 20 % more capacity rating than design
calculation for future scope and interconnection with other adjacent plant.
The following velocities will be maintained in duct line for different air conditioning systems.
Noise level generated in Central plant, Package AC plant, AHU and duct line shall not be transmitted to
the served premises. Noise level in the served premises will not exceed 65 dB (A).
For control of temperature and dehumidification of the conditioned premises, thermostat and humidistat
will be provided in the package A.C. plant room/ AHU Room .
High efficiency filter and strip heater will be installed in the supply air duct at the discharge end of blower
and the strip heater will be interlocked with the blower to prevent independent control/ switching of
heaters. Pan humidifier shall be installed in the Air Handling Unit Plant Room if required for critical
control of R.H. Level .
Make up air supply to AHU / package AC plant room shall be provided with filter and damper.
Filter: Efficiency of pre filter will be 90% down to 10 micron and fine filter will be 99% down to 5 micron.
High efficiency filter will be installed in the supply air duct at the discharge end of blower in line with job
specification requirement. For details refer ES16.
Local control of fan, pump, blower shall be provided near installation area for ON/OFF operation as
required.
Humidity Control:
The strip heater will be installed in the supply air duct at the discharge end of blower for dehumidification
purpose and the strip heater will be interlocked with the blower unit to prevent independent control/
© 2007 MECON Limited Air Conditioning, Ventilation & Air Pollution Control System GS-08
All rights reserved
Page 3 of 104
General Technical Specification
switching of heaters. Safety thermostat shall be installed in the duct line near strip heater for safety
precaution.
Pan type humidifier shall be installed in the air handling plant room for adding moisture if required for
critical control of R.H. Level . Safety thermostat shall be installed in the pan humidifier chamber near
immersion heater for safety precaution. In Pan humidifier chamber make–up water line, overflow,
drain provision with gate and float valve arrangement shall be provided.
Centrifugal pump and cooling tower for condenser cooling shall be supplied in line with job
specification requirement for water-cooled type condensing unit. For air cooled condenser unit selection
maximum ambient temperature factor shall be considered for capacity selection
Rubber/Neoprene gaskets will be used on all bolted joints as a seal against water leakage.
Water pipe line will be of MS Heavy ( C ) Class and as per IS 1239 - 1990, (part I) (RA – 1998), upto a
size of 150 NB, IS 3589-2001 for sizes beyond 150 NB MS, spirally welded, 6mm thick & conforming to
IS:3589. Pipe fittings up to 150 NB will be as per IS 1239-1992 (Part II), Amendment 2000. Fabricated
fittings manufactured from pipes may be provided for pipes of size 200 NB & above.
Velocity of water in pump suction line and delivery line will be within 1.25 and 2 m/sec respectively.
Pot /Duplex strainer will be provided in suction line of pump and ball valve/ butterfly valve will be
provided in the delivery side of pump.
Butterfly valve/ ball valve will be provided in water pipeline at condenser inlet & outlet, AHU cooling coil
inlet & outlet, pump inlet & outlet.
For better distribution of chilled water in the network in vertical line reverse-return line shall be provided
for balancing of water flow at consumer points. However for multiple consumer points in horizontal line
balancing valve shall be provided at chilled water return branch line .
Insulated drain piping network is to be included as required for steam condensate drain, with isolation
valves at proper places.
Pipe supports will be steel, adjustable for weight and coated with rust preventive primer and finish
coated with Aluminum paint. Where pipe and clamp are of dissimilar material a gasket will be provided in
between.
All piping will be tested to hydrostatic test pressure of at least one and half times the maximum of
operating pressure for period of not less than 2 hours.
For details refer ES22. Thermal and acoustic insulation for air conditioning systems shall be considered
in line with job specification requirement. However, following minimum insulation work shall be
considered.
© 2007 MECON Limited Air Conditioning, Ventilation & Air Pollution Control System GS-08
All rights reserved
Page 4 of 104
General Technical Specification
Fire safety
No combustible material, lining like insulating material will be used anywhere in the entire
air-conditioning system of shop. AC system blower, motorized fire dampers / Solenoid operated fire
dampers in the duct shall be inter locked with fire detection system to stop air flow.
The following instrumentation and necessary interlock and controls to be provided for air conditioning
system :
Any other instrumentation required for the system will be indicated & provided by the Tenderer.
A minimum clearance of 100 mm will be provided between beam bottom and top of duct to take care of
duct fabrication, flanges, insulation and allowances for civil construction.
Minimum clearance of 200 mm will be provided between duct bottom and false ceiling to take care of
collar fitting, variation in levels of false ceiling and floor levels, if any.
The successful Tenderer will study the false ceiling drawing. Additional grid work, if found necessary,
based on diffuser sizes, shall be carried out. Size of the diffuser color will match with false ceiling grid.
For served premises, return air recess may be provided at the periphery all around.
© 2007 MECON Limited Air Conditioning, Ventilation & Air Pollution Control System GS-08
All rights reserved
Page 5 of 104
General Technical Specification
Construction supervision
Interference during construction stage due to lack of supervision and co-ordination etc., will be corrected
during erection by the AC system Successful Tenderer. The false ceiling Tenderer will draw the grid on
the ceiling. The AC system Successful Tenderer will make the exact location of diffusers on the ceiling.
Similarly, locations of light fittings on the ceiling shall be considered. AC system Successful Tenderer will
co-ordinate in this regard with other Contractors to avoid any interference at a later stage. By using
plumb, from locations of diffusers drawn on ceiling, the duct fabricator will erect the main and branch
ducts. However, collars should be cut only after the false ceiling is properly leveled.
The following data shall be furnished by the tenderer along with the offers.
© 2007 MECON Limited Air Conditioning, Ventilation & Air Pollution Control System GS-08
All rights reserved
Page 6 of 104
General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply/fabrication of Dust Extraction System with all accessories required to be installed to
achieve desired performance in all respect. Specific technical requirement of Dust Extraction
System if any shall be mentioned in the job specification/data sheet as furnished along with the
Technical Specification.
Brief description of Dust Extraction System is given below under clause No. 02. The point wise list of
data to be furnished by the tenderer along with the offer is mentioned below under clause No. 03.
Dust extraction systems shall comprise of suction fan, dust extractor, ducting network, dust disposal
system, electrics, instruments & controls.
This specification specifies general requirement of Dust Extraction system for different application.
DESIGN CRITERIA
1. All the rotating parts shall be statically and dynamically balanced. Monitoring ports in ducting
and stack with platforms, approach ladders/ stairs and other requirements shall be strictly as
per the latest emission standards published by Central Pollution Control Board.
2. The efficiency of the dust cleaning equipment shall be such that the emission from stack
3
should not be more than 50 mg/Nm unless other wise specified in the job specification. The
3
average inlet air dust concentration may be taken as 10~15 gm/Nm unless otherwise
specified in the job specification.
3. The dust extraction systems shall be such that the work zone dust concentration Respirable
3
Particulate Matter ( RPM ) less than 10 micron should be limited to 1mg/Nm over back
ground level unless otherwise specified in the job specification.
4. The capacities of the dust extraction systems shall be selected considering at least 10% for
safety over the calculated values.
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General Technical Specification
6. The duct lines shall be designed self balanced . Successful tenderer has to furnish pressure
drop calculation and system capacity selection calculation before carrying out detail
engineering of DE system.
7. The dust extraction system shall be designed based on norms specified in the Hand Book of
American Conference of Governmental Industrial Hygienists (ACGIH) with fines factor and to
meet the required fugitive emission standard based on the party’s experience .
The Successful Tenderer should calculate and decide the systems capacities of their own
using the standard norms. However, in no case, the systems capacities should be less than
as specified in job specification.
7. The dust extraction equipment shall be located near to the building. Approach, handling and
hoisting facilities shall be provided for the equipment. Monitoring port holes of 100mm
diameter with plug, platforms, approach ladders/ stairs, power socket of single phase, 50 Hz,
230 V, 15 A and monitoring equipment lifting facilities shall be provided as per the emission
standards published by Central Pollution Control Board.
8. All stacks for discharge of clean air from dust extraction systems shall have a minimum
height of 30m or 3m above top of roof of the tallest adjacent building / structure whichever is
higher or as specified in the job specification. The efflux velocity from the stacks for dust
extraction systems shall be maintained 15m/ sec.(approx.). For rain protection concentric
duct to be provided on the top of stack shall be designed such that it restricts rain water
entry into stack but allows the gases to move vertically upward with the above mentioned
efflux velocity.
9. Generally the following air velocities shall be considered for the dust extraction systems.
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General Technical Specification
10. Suction hood for the dust extraction systems shall not be less than 5 mm thick MS sheet.
The ducting shall be of circular cross section
11. Duct lines shall have cleaning hatches of size 100mm x 75mm with air tight seals for easy
cleaning of accumulated dust near bends & inter connections.
12. Horizontal duct shall be avoided as far as possible. Vertical/ inclined ducting shall be
provided.
The Successful Tenderer shall include duct supports in their scope as follows:-
Ducting inside the building shall be supported on the floor or from the column/ civil
beam/building structure/technological structure etc. as applicable. The location and
type of supporting arrangement shall be decided by the Successful Tenderer in
consultation with purchaser/or purchaser’s consultant.
b) Trestle supports shall be provided on ground for the ducting outside the building.
13. The dust extraction system shall be interlocked with the technological equipment/ conveyors.
The sequence of operation shall be such that the dust extraction system shall start 5 minutes
before start of the technological equipment and shall stop 5 minutes after stoppage of the
technological equipment.
Dust disposal system including chain / screw conveyors, double cone valve/rotary air lock
valve, Dust moistener, dust storage hopper / Rotary feeder etc.
b) Chain /screw conveyors and double cone valves will be provided below the dust
extraction equipment hoppers for disposal of dust. Chain / screw conveyors will have
bearings with outside greasing terminal, protected from dust by packing around the
glands. All the vulnerable parts requiring frequent attention will be readily accessible.
If two flights of a screw coupled then, overlapping of each flight at center point shall
be made for smooth flow of material.
c) Double cone valves will be made of cast iron with the carrying side hard faced. The
double cone valve will be complete with shaft of EN8, cast iron housing, geared
drive, geared box/geared motor etc.
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General Technical Specification
e) Zero speed switches will be provided for all dust disposal system drives.
e) Compensator between rotary feeder and the chain conveyors, between two
conveyors and between dust moistener and rotary feeder will be provided to
facilitate maintenance. Slide gates will be provided before all the double cone dust
valves/rotary feeder. For calculation and design of structural members, accidental fill
up of dust up to top of hoppers in worst case will be considered by Successful
Tenderer.
A dust storage hopper for each dust collector cell shall be provided. A pyramidal
hopper with 65 valley angles shall be installed to collect the settled dust. The
hopper shall have a 2 days dust storage capacity. Rack and pinion sliding gate
(motorised) arrangement shall be provided at the hopper discharge. Dust conditioner
of double screw type / disc palletizer with controlled moisture addition shall be
provided at storage hopper outlet as defined in the Project specific TS. Vibrator if
required in the hopper is to be provided. Disposal of dust to the closed truck /
pneumatic system shall be done through telescopic chute as defined .
Rotary air lock valve shall be made of cast iron with the carrying side hard faced.
The rotary air lock valve shall be complete with shaft of EN8, cast iron housing,
geared drive, geared box/geared motor.
15. Instrumentation
The minimum platform width shall be 1.2 meters. The platforms shall be located at
the top of hoppers, level, at the top of the gas cleaning equipment, and at the
different levels required for maintenance and operation of the equipment and
dampers. A safe guard rail should be provided on the platform. Safe and easy
access to the platform shall be provided by providing stairways and railing.
Intermediate platforms shall be provided for the bag filters. Following minimum
structural member shall be considered.
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General Technical Specification
Operating Criteria
3. Adjust the manual butterfly balancing damper connected to the suction hoods for
adequate suction of dusty air from all the hoods as per design requirement so as to
control the escaping of dusts at the dust generation points.
Note : In case the RAL/Double Cone Valve trips the fan motor should also trip to avoid
uncontrolled accumulation of collected dust in Dust Extraction Equipment hopper
which otherwise may result into choking/clogging of Dust Disposal System.
The Successful Tenderer will examine the above logic and operating principle of the
DE system and changes, if any, necessary for trouble free operation of the system
being offered by the party shall be indicated.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offers.
14. Instrumentation
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply/fabrication of Dust Suppression System with all accessories required to be installed
to achieve desired performance in all respect. Specific technical requirement of Dust Suppression
System if any shall be mentioned in the job specification/data sheet as furnished along with the
Technical Specification.
Brief description of Dust Suppression System is given below under clause No. 02. The point wise list
of data to be furnished by the tenderer along with the offer is mentioned below under clause No. 03.
There are essentially three types of dust suppression system applied to control pollution in bulk material
handling. They are spraying of only water at material transfer points, spraying a solution of water &
chemical compound at material transfer points, a dual fluid water and compressed air supplied through
nozzle for production of ultra fine water particles, i.e. fog at material transfer points.
In plain water dust suppression system in general plain water at high pressure is sprayed over
stockpile area. This type of system is envisaged for the stockpile area to suppress the generated
dust due to stacking / reclamation. Spray water header will be provided along the stockpiles. Dust
suppression system is to be designed to prevent lift of dust from stockpiles. Water spray over the
stockpile area is produced by sufficient number of sprinklers suitably installed in a header to cover
the entire stockpile area. Plain water may be sprayed at transfer station as per job specification
requirement.
The sprinklers should be of swiveling type. Each sprinkler operation cycle is to be controlled by a
sequential timer to have optimum consumption of water. Water will be stored in a feed water tank.
In the supply waterline to feed water tank float valve shall be provided. One additional quick fill line
to water storage tank shall be provided. Water from feed water tank shall be supplied to different
spray header by a high-pressure pump. Sprinkler post of approx. required height should be
installed on the spray header along one/ both side of ores/ coal stock pile area. Before each
sprinkler globe valve & solenoid valve shall be provided for manual control and automatic control
respectively. The water pump is interlocked with low level switch of feed water tank to prevent the
pump from dry running. A pressure switch at the pump discharge line shall be provided to by pass
water to storage tank. A solenoid valve in by pass line shall be energized by high-pressure signal
from pressure switch.
Chemically treated dust suppression system work on the principle of agglomeration. Dust particles
released from material handling become air borne, are made to pass through a blanket of extremely
fine water droplets. The dust particle and the droplets collide and adhere to each other, thus
increasing their mass. After a series of such collision the dust particles mass become heavy. The
system implies spraying of chemical compound wetting agent and water mixture in certain ratio at each
material transfer points. Chemical solution at the pressure of 4 Kg/cm2 supplied at the atomising
nozzles. The wetting agent (chemical compound) from drum is transferred to solution tank with the help
of metering pump (one working and one reserve). Chemical compounds is added in measured quantity
in the feed water line to solution tank. The tank is provided with high, low and very low level switch.
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General Technical Specification
There are two-solution pumps (one working and one reserve). Any one of the solution pump can be
started if the tank is filled above the low level switch of solution tank and any one of the solenoid valve at
spray point is energised. Feed water pump will start when solution level in solution tank reaches low
level. Metering pump operation is interlocked with feed water pump. Feed water pump will stop when
water level in solution tank reaches high level. In case of very low level in solution tank solution pump
will stop. In case of low level in water storage tank feed water pump will stop. A pressure switch at the
solution pump discharge line shall be provided to by pass water to solution tank. Solenoid valve in by
pass line shall be energised by high-pressure signal from pressure switch. Solenoid valve shall be
installed in pipeline in a box at each junction house point to cater solution spray at belt discharge point
and belt receiving point. Solenoid valve operation should be interlocked with conveyor motor and load
sensor unit. Conveyor motor running under load will draw high current compare to conveyor running
under no load. A current transformer located in the power cable circuit will monitor conveyor motor
current and shall be interlocked with the operation of solenoid valve.
Chemically treated dust suppression system should be provided for the material transfer points in
junction houses.
The Dry Fog dust Suppression (“DFDS”- water atomization with compressed air) system works on
the principle of agglomeration. Water and compressed air are mixed in atomizing nozzles which
produces an ultra fine droplets size fog when sprayed and achieve dust suppression though
agglomeration. Dust particles released from a material handling or processing plant which becomes
air borne, are made to pass through a blanket of extremely fine fog. The dust particles and the
micronic sized fog droplets collide and adhere to each other, thus increasing their mass. After a
series of such collisions, the mass becomes heavy enough to cause settlement of the agglomerates
on to the larger mass of the material being handled.
The System uses an air Driven Acoustic Oscillator Nozzle which is capable of producing supper fine
atomization of water droplets that greatly increase the dust particle to water droplet contact resulting
in settlement of dust. The fine droplets evaporate before wetting anything but the dust. The
approximate water addition is 0.1% of the weight of material being handled.
Description of Scheme
The DFDS system comprising main equipment installed at the application points and auxiliary
equipment installed at central water and compressed air supply point. Brief components of both type
of equipment are mentioned below:
• Main Equipment
The Main Equipment will include Spray Bar Assemblies fitted with Dual-fluid air Driven
Acoustic Oscillator Atomizing Nozzles, Pressure Regulating Units and Flow Activation
Stations for ON-OFF Control of the System and Instrumentation for Auto Operation.
• Auxiliary Equipment
The Auxiliary Equipment will include Water Storage and Pumping Unit with duplex Water
Filter Compressors with air receivers and Associated Electrical Works, Air and Water Piping,
Enclosures etc.
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General Technical Specification
Spray nozzles
Spray nozzles for dust suppression systems shall be of fog-jet type and shall have a solid cone spray
pattern with a round impact area and minimum spray angle of 60º.
The nozzles should produce spray distribution of fine sized droplets at the given flow rate and
pressure and should provide complete coverage of the spraying area or zone.
The nozzle housing shall be made of cast aluminium alloy and the tip shall be of stainless steel
conforming to AISI-410 or SS-304 with SS strainer
The nozzles should be of self cleaning type with in-built filters made of brass.
Sprinklers
Circular swiveling type sprinklers shall be provided for dust suppression system of stockpiles to
spray water and prevent fugitive dust emission.
This specification specifies general requirement of dust suppression system for different application.
i. The capacities of the dust suppression systems shall be selected considering at least 10%
for safety over the calculated values.
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General Technical Specification
The Successful Tenderer should calculate and decide the system capacities on their own
using the standard norms. However, in no case, the system capacities should be less than
as specified in job specification.
iv. The dust suppression equipment shall be located near to the application area. Approach,
handling and hoisting facilities shall be provided for the equipment.
v. Generally the water line velocity shall be considered for the dust suppression system 0.75 to
1.5m/sec.
The Successful Tenderer shall include pipe supports in their scope as follows-
vii. Instrumentation
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General Technical Specification
The following data shall be furnished by the tenderer along with the offers.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply/fabrication of Ventilation System with all accessories required to be installed for
HVAC application to achieve desired performance in all respect. Specific technical requirement of
Ventilation System if any shall be mentioned in the job specification/data sheet as furnished along
with the Technical Specification.
Brief description of Ventilation System is given below under clause No. 02. The point wise list of
data to be furnished by the tenderer along with the offer is mentioned below under clause No. 03.
02. Description
Ventilation system shall be provided to maintain proper working conditions environment compatible with
human hygienic requirements and to maintain conditions necessary for proper storage of materials and
working of plant and equipment. The ventilation system generally include one or more items of
equipment and accessories such as fans, air filters, duct work, pumps, air washer, air supply grills,
dampers, insulation, instrumentation and controls, electrics, etc.
Ventilation system will be designed considering the climatic conditions prevailing in the region and the
plants will generally be installed in separate plant rooms independent of the served premises. The plant
rooms will be provided integral with and adjacent to the served premises at proper locations on
considerations of convenience of routing of ducts/pipes, availability of fresh uncontaminated air and
creating least disturbance to the adjacent premises in terms of vibration and noise.
Ventilation system will be provided with adequate measures for safety and fire fighting for fire hazardous
areas and shall be of flame proof/explosion proof construction.
Detail item specification of following accessories for HVAC System is mentioned in the respective
Equipment Specification.
Ventilation facilities
Buildings and shops will generally be provided natural ventilation. Mechanical ventilation will be
provided for premises where adequate ventilation cannot be provided by natural means alone.
Depending upon the specific requirement, the shops/buildings will be provided with either exhaust
ventilation or plenum ventilation. The system design will take into account the requirements of air
change as well as excess heat removal. Filters will be provided with plenum systems. By plenum
ventilation, the served premises will be pressurised to 2-3 mmWC to avoid ingress of dusty air. Hot
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General Technical Specification
Location/Shop Facilities
Electrical premises, Switch gear rooms, Cable Pressurised ventilation with or without air
basements of Electrical sub stations washer as per job specification
requirement
Compressed air stations Exhaust ventilation
Battery rooms Exhaust ventilation
Pump houses Air cooled type ventilation
Toilets/Stores rooms Exhaust ventilation
Hot working spots Portable ventilation
work areas will be provided with portable man-coolers for spot cooling. Man-coolers will be provided
also in a few other areas where the premises are manned and have high heat radiation. General
details and types of system to be considered is mentioned below. However, specific requirement of
ventilation system shall be provided in line with job specification requirement.
The temperature of the Electrical premises and other sub-stations shall be maintained at in the range
of 35 ~37 deg C right through the year by the provision of suitable air-cooling system. Air changes
for air-cooling system shall be considered minimum 15 and for dry ventilation minimum system 20.
Water eliminator in air washer shall be made of PVC .
The temperature of the areas being exhaust ventilated shall not exceed 3 deg C above the ambient at
any part of the year.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offers.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Air Handling Unit (AHU)/Fan Coil Unit (FCU) with all
accessories to make operation of Air Handling Unit (AHU)/Fan Coil Unit (FCU) complete in
all respect. Specific technical requirement of Axial Flow Fan if any shall be mentioned in the
job specification/data sheet as furnished along with the Technical Specification.
Brief description of the Air Handling Unit (AHU)/Fan Coil Unit (FCU) is given below under
clause No. 02. The equipment-wise list of data to be furnished by the tenderer along with
the offer is shown below under clause No. 03.
Job specification of the project shall be referred for any specific requirement.
02. Description
The Air handling unit / FCU shall be of Fabricated construction, comprising of the following
sections :
The air handling unit comprising of fan section, cooling coil section and pre-
filter section . The AHU shall be of double skin panel construction. Double
skin sandwich panels shall be fabricated from 22 gauge GI sheet. Minimum
zinc deposition shall conform to Grade 275 of IS 277,1992. AHU casing shall
be thermally insulated with 25 mm thick PUF board in between the outer and
inner skin. The unit sections are mounted on galvanized sheet steel channel
& aluminium die cast legs. Panels shall be fitted to Al frame work with
neoprene gaskets & screws. The framework of AHU casing shall be
assembled by means of reinforced nylon corners. The fan section of the
casing shall be provided with access door. Aluminium die cast hinges &
handles shall be used in access door. Fan impeller shall be of backward
curved blade centrifugal type. Impeller shall be of double width double inlet.
Impeller blades shall be fabricated from heavy gauge galvanised sheet steel
or MS with spray galvanized. Fan rpm shall not be more than 750 rpm.
Flexible connection & volume control damper (opposed blade type) shall be
provided at fan outlet.
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General Technical Specification
Chilled water cooling coils shall be constructed with copper tubes with fins of
aluminium. Thickness of Cu tubes shall be minimum 0.75 mm thick and fins
spacing shall be minimum 10 fins per inch. Cooling coil header shall be of
GI. Chilled water coils shall be provide with suitable vent and drain
connections. Drain pan sh
all be fabricated from minimum 22 G stainless steel sheet and stainless steel
nipple for drain connection. The entire assembly shall be mounted on PUF
insulated bottom panel. Condensate drain pipe of required length with
sealing loop shall be provided and be insulated. The drain from drain pan
shall be connected to floor drain. Air velocity through cooling coil shall not
exceed 2.5 m/sec. Water pressure drop through cooling coil shall be limited
to 5 mwc. Rows of cooling coil of AHUs shall be 6 , however for 100 %
fresh air application Rows of cooling coil of AHUs shall be 8.
Chilled water flow through AHU will be controlled by 3 way mixing valve. A
bypass line around 3 way valves shall be provided. Make of 3 ways valve
shall be Honeywell/ Johnson/ Siemens/ Sauter.
Temperature switch and transmitter for monitoring of chilled water and served premises
temperature shall be provided .
Fan coil units (FCUs) shall be wall mounted or ceiling suspended type and shall be installed
inside the served premises for small isolated cabins / rooms.
The following data shall be furnished by the tenderer along with the offer for Air handling
unit/fan coil unit.
A. General
B. Fan Section
3
a) Air quantity (m /hr)
b) Total/static pressure (mmWC)
c) Fan speed (RPM)
d) Fan dia (mm) & number
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General Technical Specification
C. Cooling coil
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Air Washer Unit with all accessories required to be installed
for HVAC application to achieve desired performance in all respect. Specific technical
requirement of Air Washer Unit if any shall be mentioned in the job specification/data sheet
as furnished along with the Technical Specification.
Brief description of Air Washer Unit is given below under clause No. 02. The point wise list
of data to be furnished by the tenderer along with the offer is mentioned below under clause
No. 03.
Air washer unit comprises of intermediate chambers at inlet and outlet, air washing chamber
with water tank. The water tank. Adapter section shall be provided for connecting air washer
unit with other equipment. Description of these items are given below:
The air washer is used for evaporative cooling of air. The air washer shall be complete with
headers, spraying brass nozzles, air distributors, water droplet eliminators, make up water
connection with float valve, strainer, overflow connection, quick filling connection, drain
connection and other standard accessories. The number of nozzles, size, headers and their
disposition shall be suitable for the saturation efficiency of not less than 90% for air washer.
The door with viewing port shall be provided for servicing the chamber. The lower portion of
the air washer shall serve as tank.
Water of the air washer tank shall be recirculated through pump ( 1 W + 1 S ) & piping
network consisting of suction pipes, pot strainers, valves, delivery pipes with branches and
spray nozzles etc. The air distributor (perforated plate) shall be provided at the inlet of spray
chamber for proper distribution of air to the spray chamber. The PVC droplet eliminator shall
be provided at the outlet of spray chamber to arrest/ prevent the water droplets from the air
going out of the spray chamber. Water loss in the air washing unit shall be filled by the make
up water. Make up water from separate source shall be taken to the air washer tank through
necessary make up water pipe line with float and globe valves. Another quick fill water pipe
line also shall be provided with gate valve for the air washer tank filling. Temperature
gauges, pressure gauges, water proof lights, manometer shall be provided at the air washer
chambers. Dry running protection of re-circulating pump with water flow switch / tank level
switch shall be provided. Drain connections with valves shall be provided for all the three
chambers of air washer equipment. The over flow pipe shall also be provided for air washer
tank which shall be connected to its drain pipe after/ below the valve of the drain pipe.
The casing and tank shall be made of mild steel plate with black bituminous protective
paints. The distributor and eliminators shall be made of galvanised sheet steel.
The sheet thickness for air washer tank shall be 6mm and for the body of the air washer
shall be 4 mm unless otherwise specified in the TS.
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General Technical Specification
The water proof lights shall be provided inside the chambers of the air washer with lead
wiring and switches. Low level switch at air washer tank & interlocked with the
re-circulating pump shall be provided .
Air washing chamber shall be provided with drilled flanges at both ends to connect with
intermediate chambers on both sides. Rubber gaskets shall be provided at the connection
point of intermediate chambers and at inspection window to prevent water leakage.
Water Eliminator shall be PVC baffle arranged such that no water droplets are carried away
with the air stream.
The water pipelines shall be of galvanised iron pipes. The nozzles shall be made of brass or
gun metal unless otherwise mentioned in the TS.
The air washer with the tank shall be mounted on a foundation made on the floor of the
ventilation room.
Masonry construction air washer chamber may be required to be installed as per job
specification requirement.
Intermediate chamber
Intermediate chamber shall be fabricated out of heavy gauge steel sheet (not less than 4mm
thick) with drilled flanges at both ends. Water proof light with lead wiring and switches, air-
tight door, coupling for installing check instruments, drain connection etc. shall be provided
with the intermediate chambers.
Adapter section
Connecting box/ transition piece/ reducer shall connect the intermediate chamber with fan
inlet through flexible connection. It shall be fabricated out of heavy gauge steel sheet with
drilled flanges at both ends of minimum thickness 3.15 mm.
Triangular leg type (∆ shaped) supports shall be provided on the floor for supporting the
intermediate chambers.
The following data air washer unit shall be furnished by the tenderer along with the offer.
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General Technical Specification
b) Intermediate chamber
1. Size
2. Material of construction
3. Thickness of material
c) Adaptor section
1. Size
2. Material of construction
4. Thickness of material
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply/fabrication of Bag Filter with all accessories required to be installed for Dedusting
System application to achieve desired performance in all respect. Specific technical requirement of
Bag Filter System if any shall be mentioned in the job specification/data sheet as furnished along
with the Technical Specification.
Brief description of Bag Filter System is given below under clause No. 02. The point wise list of data
to be furnished by the tenderer along with the offer is mentioned below under clause No. 03.
Constructional Features
- Module shell.
- Hopper for each module with RAVS/Screw conveyor with RAVS.
- Storage hopper with rack & pinion gate valves
- Housing and roof panels.
- Tube plate.
- Compressed air distribution system.
- Access doors.
- Filter bags and cages.
- Inlet and outlet manifolds.
The bag filter shall have a plenum chamber, which distributes the incoming gas onto an array of
fabric filter bags. Dust particles shall be entrapped on the filter fabric, cake lining the bag surface by
straining, impingement, interception and electrostatic attraction. Rotary air lock valves shall be
provided at the bottom of bag filter hopper for dust removal and air sealing.
Normally bag filter casing thickness shall be 5 mm with sufficient stiffener to withstand design static
pressure inside Bag filter chamber .
The inlet air plenum for the fabric filter should feature a tapered feed duct in order to ensure uniform
gas flow distribution to all cells.
Air entry to the cells should be directed uniformly by angles deflection louvers to ensure complete
bag usage within the cell. Cross horizontal flows shall not impinge on the bags in any area.
The bag fixing arrangement shall be such so as to enable easy and quick changing of bags.
Bags shall be hung as near as practicable to vertical so that the bags are not touching anywhere
along their length. The Bag filter shall have antistatic Bags and spark proof design for the coke/ coal
application.
Particular attention shall be paid to the layout of the bags. A minimum distance of 75 mm between
the bags and the closest fabric surface such as walls or columns of the casing shall be provided. The
spacing between the bags shall be 50 mm (minimum).
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General Technical Specification
The contractor should design the pulse-jet fabric filter dust collector to operate under design flow
3 2
conditions with a gas/air to cloth ratio as 1.4 m / min/m unless otherwise specified in the project
specification. However, the same can vary from 1.0 to 1.8 depending on fabric and dust material to
be handled.
Bag Cleaning
The bag filters shall be of on line / off line cleaning pulse-jet type as specified in the job specification.
Material of construction of bags shall be selected based on operating temperature, dust quality,
quantity and composition and air quality. The cleaning of bags shall be carried out in a
predetermined cycle by high-pressure pulse of compressed air by automatic operation of solenoid
valve with timer.
A differential pressure measurement system shall be provided across the bag house. As the dust
collects over the bags, the pressure drop shall be sensed by this system. As this drop exceeds a
preset value the differential pressure measurement system shall send a pulse to start the bag
cleaning operation.
Compressed air shall be the cleaning medium and this shall enter the bags in short surges thus
inflating the bags. The dust shall collect in the hoppers provided and shall be transferred by
conveyor/ RAVS to holding hopper. In general centralized Compressed air network with air drier
shall be provided to ensure supply of dirt and moisture free compressed air for bag cleaning as per
job specification requirement.
The successful tenderer shall supply compressor along with drive and accessories safety valve,
pressure gauge, air filter cum moisture separator unless otherwise specified in the job specification.
A dust storage hopper for each fabric filter module shall be provided. A inverted pyramidal hopper
with 65 valley angles shall be installed to collect the settled dust. Vibrator if required in the hopper is
to be provided. For hot gas cleaning system hopper heater with thermal insulation shall be provided
to reduce chance of condensation in hopper. Normally storage hopper thickness shall be 8mm
unless defined in the TS .
The minimum platform width shall be 1.2 meters. The platforms shall be located at the top of
hoppers, level, at the top of the gas cleaning equipment, and at the different levels required for
maintenance and operation of the equipment and dampers. A safe guard rail should be provided on
the platform. Providing stairways and railing shall provide safe and easy access to the platform.
Intermediate platforms shall be provided for the bag filters. Following minimum structural member
shall be considered.
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General Technical Specification
The Electrics for bag filters of D.E. system will consist of pressure switches cum indicator in the
compressed air line, differential pressure switches, solenoid valves, control panel and all other
associated equipment. The brief specification of the major components will be as given below :
The control panel will be free standing, floor mounting, fabricated from 2.0 mm thick CRCA sheet steel
on a base channel of size 77 mm x 40 mm (ISMC - 75) provided with cable gland plates, having
synthetic rubber gasketting, provided with double door & canopy and enclosure conforming to IPW-55.
The control panel will be factory assembled, wired with 1.1 kV grade PVC flexible wire of copper
conductor (minimum size 2.5 sq.mm), factory painted. The control panel will be provided with following
major equipment:
a) Incoming switch (minimum 32A, AC23 duty) with operating handle interlocked with the door,
HRC fuses, contactors, MCBs in the various circuits.
b) Control transformer of required VA rating having +/-5 percent and +/- 2.5 percent tappings
in the primary side of the control transformer with Isolating switches/MCBs in the primary &
secondary sides.
a) 24V DC full wave power pack complete with filter and protective elements and also isolation
cum short circuit protection both at AC and DC sides for power supply to solenoid valves.
b) Auxiliary contactor for control power supply monitoring, interlocking, and controls etc.
e) Auto-manual selector switches, push button switches, indication lamps, various monitoring
devices, terminals (with 20 percent spare terminals) and other circuit elements required for
control and monitoring.
The bag filter timer will be solid state device suitable for dusty, tropical and specified
aggressive environment. The bag filter timer will be provided with internal semi-conductor
fuse protection and will have provision for pulse frequency setting and pulse duration setting
through independent operating knobs. The number of contacts in the timer will be equal to
number of solenoid operated valves so that the timer will energise only one solenoid valve at
a time and shall operate in sequence.
The Bag Filter Timer will provide timed sequential energisation of 24V DC operated solenoid
valves of bag filters. LEDs for each solenoid energisation, power ON in PCB, feed back relay
will be provided with potential free contacts which will close under following conditions :
ii) Open contact in the output side connected to individual solenoid valves. The contact
will not close in the event of power failure to the controller.
iii) The sequential control (i.e. process) will start when the Differential Pressure (DP)
switch is actuated at the first set point for normal operation. The process will
continue till the pressure differential drops below the set value. When again the DP
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General Technical Specification
switch is actuated the process will continue from the previous position (i.e. next
solenoid valve). However, when the power supply to sequential controller trips, the
process will stop and sequential controller is reset to first load position enabling the
process to start from the beginning.
iv) Sufficient space will be provided for installation of bag filter panel with required front
clearances for operation and maintenance including side and back clearances as
required.
i) The differential pressure switch will have two sets of independent micro-switches. The
first set will be used for normal sequential cleaning operation of the bag filters as per lower
set value of differential pressure. This set point will be independently adjustable.
ii) The second set of N.O. contact will close at upper set value of differential pressure
representing clogged condition of bag filter and will be used for signaling and monitoring.
This set point will also be independently adjustable. The contacts will be rated for 5 Amp,
240V AC.
iii) The DP switch will be suitable for outdoor installation. The DP switch casing will be made of
pressure die cast Aluminum with enclosure conforming to IP-66.
iv) One number differential pressure switch with two set points will be provided for each module of
the Bag filter. Alternatively, two numbers of DP switches may be provided for each module one
for initiation of bag cleaning operation and other for signaling and monitoring of clogged
condition.
Solenoids
i) The solenoid coil will have encapsulated coil ( class`F' insulated with a water proof (IP-65)
plug-on connector. The coil will be suitable for 24V DC having + 10 % to -15 % voltage
variations. The coil will be made of copper conductor.
i) One number compressed air pressure switch cum indicator will be provided for each bag
filter system in the incoming compressed air pipeline of the bag filter. The pressure range
will match with the operating pressure. The switches will be snap action type with 1 NO + 1
NC contacts of 5A, 240 V AC. These contacts will be wired up to terminals in the bag filter
control panel. The enclosure of the air pressure switch will be pressure die cast aluminum
conforming to IP-65.
GENERAL ELECTRICAL LOGIC AND OPERATING PRINCIPLE OF THE BAG FILTER SYSTEM
A. Mainly the differential pressure will govern the Dedusting Bag Filter system across the
Dedusting Modules.
The total electrical logic will be controlled by the Devices like Differential Pressure Switch
(DPS), solid-state sequential multi channel timer, solid-state master card, solenoid operated
Diaphragm valves, inlet compressed air line pressure switch (P.S.) etc. DPS will be connected
across the clean and dirty Air Chamber of the Bag Filter Module to measure the Pressure
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General Technical Specification
Differential. As the Filtration process commences, there is a gradual build up of dust on the
Filter Bags which generates Differential Pressure. When this Differential Pressure attains a
Pre-set value based on inlet dust concentration, type of dust and its particle size distribution, the
differential pressure switch will get energized and send signal to the master card located in the
control panel.
The master card will actuate the timer whose channels are connected with solenoid valves
mounted on the compressed air header-Air Manifold Tank. Through the timer, the solenoid coil
gets magnetized and makes an opening for the compressed air to flow from air manifold tank to
pulse header pipe.
The pulse duration time will be adjustable. During this time the solenoid coil will remain
energised allowing pulse air to flow. Energisation of other solenoid will take place in
sequence one after the other. The time gap between the two-solenoid energisation will also
be adjustable.
The process continues till the pressure differential drops below the set value. The D.P.
Switch then gets de-energised which in turn cuts off the timer resulting in de-energisation of
solenoid valves. The process will repeat again from the next solenoid valve based on the
pressure differential switch and signal from the master card.
A pressure switch mounted on the compressed air line will sense the available pressure and
dedusting system/ centrifugal fan will switched off in case the available pressure falls below
the specified pressure in compressed air line.
B. Following sequential steps of operation will be followed before actually switching on the main
technological equipment to be dedusted:
1) Screw conveyor drives along with rotary air lock drive will be started first.
3) Fan motor to be started in the inlet Damper closed condition. After appropriate time
delay fan inlet damper to be opened.
The tenderer along with the offer shall furnish the following data :
Bag filter
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General Technical Specification
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of different type of Centrifugal Fan required to be installed for
HVAC, Dust Extraction, Combustion System process application with all accessories to
achieve desired performance. Specific technical requirement of Centrifugal Fan if any shall
be mentioned in the job specification/data sheet as furnished along with the Technical
Specification.
Brief description of different type of Centrifugal Fan is given below under clause No. 02. The
point wise list of data to be furnished by the tenderer along with the offer is mentioned below
under clause No. 03.
Generally the fans shall be of limit load design. Centrifugal Fan design shall conform to IS
4894 – 1987 (Reaffirmed 1991).
The fan shall be of rugged steel construction, industrial duty type and suitable for the
proposed project/plant. Fan housing shall be of welded construction and provided with
flanges at inlet and outlet sides for duct connections.
The fan unit shall be free from undue noise and vibration during operation; normally the fan
speed shall not be more than 1500 RPM, preferably less than 1000 RPM.
The fan shall be both statically and dynamically balanced as per ISO:1940. In general HVAC
system application balancing grade shall be of 6.3 and for process application balancing
grade shall be of 2.5 .
The fan impeller may be backward curved / backward inclined/forward curve/radial job
specification as per requirement.
Fan bearing shall be of self aligning, heavy duty type. Bearing shall be selected with ample
safety factor for longer life.
Fabricated steel bracket of M.S. angles, channels and chequered plates shall be provided to
take static and dynamic load of the fan and motor assembly.
Electrically operated / manually operated inlet vane damper shall be provided as a regulating
device for control of fan flow volume as per TS requirement. The air stream shall be caused
to rotate through alteration of the pitch of guide vanes.
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General Technical Specification
Fan inlet and outlet flexible connections shall be provided as per TS requirement. Guide
plate shall be provided to prevent direct contact of flexible fabric with air flow.
Anchor bolts, nuts, foundation plates etc. as required shall be supplied with the equipment.
The equipment shall be designed to permit ease of access during inspection, maintenance
and repair.
The first critical speed of the rotating assembly shall be at least 25% above the operating
speed.
The housing shall be provided with lifting eye for ease of handling and bolted type access
door.
The noise level of fan shall not exceed 85dB(A) at a distance of 1 m when running at full
load. Material of construction, capacity and static pressure of fan shall be as per TS
requirement.
The fan shall have following minimum thickness of materials for different parts unless
otherwise specified in TS for HVAC application :
3
a) Capacity below 20,000 m /hr :
Casing : 3.15 mm
Back plate : 4 mm
Impeller : 2.5 mm
3 3
b) Capacity above 20,000 m /hr and below 50,000 m /hr
Casing : 4 mm
Back plate : 6 mm
Impeller : 3.15 mm
Casing : 6 mm
Back plate : 8 mm
Impeller : 6 mm
However for different process application depending upon specific requirement material of
construction shall be defined in TS.
The fan shall be provided with drive motor, drive coupling/V-belt, belt pulley, belt guard, fan
inlet and outlet flexible connections, variable inlet vane, fan outlet damper, slide rails,
foundation plates, gaskets, base frame, vibration isolators, foundation bolts and nuts, fan
inlet protection screen and other standard accessories unless otherwise specified in the TS.
All these items/materials and accessories shall be supplied with the fan.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer.
a) CENTRIFUGAL FAN
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General Technical Specification
b) VIV Damper
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, testing and supply/fabrication of Pumps with all accessories required to be
installed to achieve desired performance in all respect. Specific technical requirement of
Pumps if any shall be mentioned in the job specification/data sheet as furnished along with
the Technical Specification.
Brief description of Pumps is given below under clause No. 02. The point wise list of data to
be furnished by the tenderer along with the offer is mentioned under clause No. 03.
02. Pumps
The pumps shall be designed, manufactured and tested as per IS:1520-1980 (R.A. 1993),
IS:5120.1977 (R.A.1997) Amendment 2000, IS:9137-1978 (R.A. 1993), IS6595-1993 (Part
II) or as per other international standards acceptable to the Purchaser and shall be suitable
for the duty conditions and capacities as indicated in this specification.
The centrifugal pumps along with their auxiliary equipment shall be suitable for the required
duty conditions and shall be designed and manufactured for continuous duty at full load.
All the pumps shall be capable of developing the required total head at rated capacity for
continuous operation. The pumps shall operate satisfactorily at any point on the H-Q
characteristic curve over a range of 50% to 130% capacity or capacity corresponding to 75%
of the total head whichever is lower.
Capacity vs discharge pressure curve for each pump shall preferably be continuously
drooping from the shut-off point to the rated operation point and be suitable for parallel
operation. The pumps shall be designed to avoid cavitation at any of the operating points.
The required duty range for a pump shall be on stable portion of its head-capacity curve
close to the best efficiency point. The head developed at the best efficiency point shall be
close to the required differential pressure so that throttling is not required at pump discharge.
The equipment and auxiliaries shall be designed for quick and economical maintenance.
The equipment shall be easily dismantleable without disturbing the suction and delivery pipe
connections.
The equipment design shall incorporate provisions for reduction in noise level.
The rotating elements of the pumps shall be checked for critical speed in bending as well as
torsion. The critical speeds shall be at least 30% away from the normal speeds for units with
flexible shafts and at least 20% away from the maximum operating speed in case of stiff
shafts.
All passages inside the pump casing and impellers, which may be inaccessible to machining,
shall be ground to a smooth finish as far as practicable.
All pumps preferably shall be horizontally split type with maximum RPM of
1,500. However, very small pump of capacity less than 15 m3/h for air
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General Technical Specification
Casing - C.I
Impeller - Bronze
Bearing Bracket - C.I
Shaft protection sleeve - Bronze
Wearing ring - Bronze
Shaft - C-45
Common base frame for pump & motor - M.S
The direction of rotation shall be clearly marked either by incorporating it on the casing or by
an arrow on a separate metal plate securely fitted to the casing.
A stainless steel name plate of 2 mm thickness shall be provided and securely attached by
stainless steel pins at an easily accessible point on the pump. The plate shall be
stamped with the following minimum information :-
a) DESIGN CAPACITY
b) TOTAL HEAD
c) SPEED
d) MOTOR RATING
e) MODEL NUMBER
f) MANUFACTURER’S SERIAL NUMBER
g) WEIGHT OF EQUIPMENT
h) TAG NUMBER
The total head-capacity curve shall preferably be continuously rising towards the shut-off.
The shut-off head shall be at least 110% of the total head.
The required NPSH at duty point shall be at least 1.0 m lesser than the available NPSH .
The power rating of the pump motor shall be larger of the following
b) For parallel operation, motor rating should be sufficient enough for running of single
pump also.
The common base frame for pump and motor shall be in one piece with suitable holes for
grouting. Adequate space shall be provided between pump drain connections and base plate
for installation of minimum 15mm drain piping. Pumps shall be supplied with suitable drain
pans or drain rim type base plates with valved drain connections.
Coupling guard, made of expanded metal and bolted to the base plate shall be supplied for
all pumps.
Pumps will be supplied with flexible coupling. Back-pull out type pump shall be provided with
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General Technical Specification
Standard hydrostatic test shall be conducted on the pump casing with water at 1.5 times the
maximum discharge head or twice the rated discharge head whichever is higher. The
hydrostatic tests on the casing shall be conducted for a minimum duration of 30 minutes.
Casing
The casing shall be of cast iron and shall be designed for a pressure not less than the shut-
off pressure at the highest operating speed plus the maximum pressure that may be
encountered at the pump inlet. In addition, CI casing shall have corrosion allowance of not
lower than 3 mm.
Impellers
Impeller shall be of bronze. Impellers and balancing drums (if provided) shall be statically
and dynamically balanced. Dynamic balancing shall be at the operating speed of the pump.
For multi stage pumps, all the impellers shall be assembled together for balancing.
Provision shall be made for adjusting the clearance between the impeller and the casing to
compensate for wear.
The impeller shall be keyed or screwed on to the shaft in such a way that it does not come-
out due to reverse rotation of the pump.
Shaft
The shaft shall be of EN-8 or C-40 or equivalent and shall be designed for critical speed. The
ratio of critical speed to speed of shaft shall be not less than 1.3 for solid shafts.
The deflection in line shaft shall not exceed 1 mm per meter of length. All shafts above 150
mm diameter shall be ultrasonically tested. Shafts shall be checked for endurance and
strength. Change of sections in shafts if considered shall be made with due allowance for
stress concentration. Shafts shall be machined to close tolerance for mounting on impeller
bearings, shaft seal, shaft sleeve, shaft coupling etc. The magnitude of shaft deflection at
the face of the shaft seal shall not exceed 50 microns.
Horizontal pump sets shall be provided with flexible couplings of pin and bush type and shall
be constructed of metallic materials except for bush which shall be of rubber materials.
Coupling shall be properly keyed in place and the cylindrical fit shall allow simple removal of
the coupling in the field.
Removable coupling guards shall be supplied and mounted. Guards shall be sufficiently
heavy and rigid to provide adequate personnel safety.
Shaft sealing
Shaft seals shall be provided to prevent leakage out of, or into, a pump over the range of
specified operating conditions. The seals shall be suitable for variations in inlet conditions
that may prevail during start-up and shut down. They shall be accessible for inspection and
replacement without disturbing any part of the installation.
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General Technical Specification
Bearing
Two bearing assemblies shall be provided, one within the frame to carry radial load only and
the other to carry both radial and axial thrust. Bearings shall be of manufacturer standard
design, antifriction type, oil / grease lubricated. Suitable thrust bearings shall be provided in
the pump to take total thrust of the pump including hydraulic thrust. Thrust bearings shall be
of oil lubricated type with suitable cooling arrangement. Motor thrust bearing shall be
designed without water cooling arrangement. Suitable tapped holes shall be provided for
refilling of oil in the bearing housing.
All the vertical pumps shall be provided with separate thrust bearings with proper lubrication
and cooling facilities as required so that the thrust and other vertical loads due to the moving
parts are not transferred to the prime mover.
Base plate
All horizontal pumps shall be supplied with sturdy base plates of manufacturer’s standard,
common to pump and drive. Base plates and pump supports shall be constructed so rigidly
and the unit so mounted as to minimize misalignment due to piping strain, internal differential
thermal expansion, etc. Base plates shall be fabricated from MS channels.
Plate flanges having raised face shall be provided at suction and delivery side of pumps and
they shall be of mild steel and conform to table 17 of IS: 6392-1971 (R.A.1988). Slip on
raised face flanges to 150 Lbs. class conforming to ANSI B16.5 shall also be acceptable.
Black bolts and nuts conforming to IS 1362-1992 shall be provided for the companion
flanges.
CAF gaskets of 1.5 mm thickness conforming to IS: 2712-1979 (R.A. 1994) shall be
provided for the companion flanges.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer.
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General Technical Specification
VAM shall be supplied with full operating charge of refrigerant (water) &
lithium bromide solution (with non toxic inhibitor) and shall be factory tested
under operating conditions.
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General Technical Specification
VAM shall have connectivity for communication, data logging, history charts,
mimics to PC at remote location.
M.O.C of all the heat exchangers tubes shall be of Cu (70%) -Ni (30%) &
seamless.
Fouling factor for condenser & evaporator shall be considered 0.001 &
0.0005 hr-ft 2-O F/ Btu respectively
Vapour absorption m/c shall be chosen not only to meet the full load design,
but also to perform efficiently at lower loads and at lower condenser water
inlet temperature (particularly during winter season). If needed condenser
water temperature control shall be provided. Tenderer shall furnish the inlet
condenser water temperature range of their machine.
Evaporator heat exchanger design shall meet the chilled water inlet & outlet
temperature required for process cooling .
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of different type of Direct Expansion (DX) type / Chilled Water
generator equipment with all accessories required to be installed for HVAC and process
cooling purpose to achieve desired performance. Specific technical requirement of Direct
Expansion (DX) type / Chilled water generator type equipment if any shall be mentioned in
the job specification/data sheet as furnished along with the Technical Specification.
Brief description of different type of Direct Expansion (DX) / Chilled Water generator Type
Equipment is given below under clause No. 02. The point wise list of data to be furnished by
the tenderer along with the offer is mentioned below under clause No. 03.
02 Description
1. Base Frame:
Water chilling package base frame structure will hold the following :
Normally Water chilling package shall be of floor mounted two tier type.
Direct Expansion (DX) type frame structure will hold the following :
Resistoflex neoprene pads shall be used as vibration isolator between common base
frame and floor and spring cup type vibration dampers shall be used between
compressor and common base frame.
2. Refrigeration compressor
The chiller shall be supplied with full operating charge of refrigerant R-22/ R-134a &
lubricating oil. Chiller performance shall be ARI certified as per ARI standard 550-92.
Cooler (evaporator) shall be dry expansion type .
Compressor housing cylinder head shall be of fine grained cast iron. Valve plates shall
be of cast iron or stainless (ring plate type). The piston shall be made from light metal
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General Technical Specification
alloys preferably Aluminum with one oil groove and two compressor rings. The
connecting rod shall be of forged steel of Aluminum alloys with integral bearing
surfaces on crank and piston pin ends. Crank shaft shall be of forged steel with drill for
oil distribution. Crank shaft shall be statically and dynamically balanced to eliminate
vibration. In case of shaft seal, the same shall be positive acting to prevent the
leakage of refrigerant and infiltration of air during compressor operation and idle
periods.
The main bearing shall be of self-alignment, horizontally split and lined with anti-friction
bearing metal.
The refrigerant compressor shall be equipped with built-in automatic unloaded starting
arrangement.
Electrically operated crankcase heaters suitable for specified power supply system
shall be provided. Heaters shall be automatically actuated when compressor is
stopped.
The compressor shall have automatic capacity control in addition to manual capacity
regulation. Capacity regulation shall permit the operation of the compressor at part
load with reduced power consumption.
The following accessories and instrumentation shall be considered for the refrigerant
compressor:
The following controls and safety devices shall be provided for the compressor:
3. Condenser
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General Technical Specification
The condenser shall be of horizontal, shell and tube type construction with water
flowing inside the tubes and the refrigerant gas condensing outside the tubes.
Alternatively as per job specification requirement air cooled type condenser may be
provided. Condenser design shall confirm to IS-11327-1985 guide lines.
The condenser shall be equipped with integral finned type, solid drawn, seamless
copper tubes.
The condenser tubes shall be rolled into the grooves of tube sheets at either end to
ensure a perfect water and air tight joint.
Adequate baffling arrangement shall be used in the condenser for improved heat
transfer.
The joints of water boxes and tube sheets shall be water tight while those of tube
sheets and shell are air tight to prevent leakage of refrigerant and infiltration of
moisture into the system.
A. Purge valve
B. Charging valve
C. Relief valve/fusible plug
D. Hot gas inlet/liquid outlet connections or the shell with flanges.
E. Water inlet/ outlet connections with flanges.
F. Hand shut-off valve for water inlet and outlet to condenser and chiller.
G. Pressure and temperature gauges for water inlet and outlet/refrigerant gas inlet and
outlet.
H. Vent valves etc.
I. Charging valve.
4. Chiller
The chiller will be of direct expansion, horizontal, shell and tube type construction with
the refrigerant flowing inside the tubes and the water outside the tubes.
Chiller shall have MS fabricated shell, copper tubes with internal turbulators and MS
tube sheet and MS fabricated or cast iron shell end boxes. The shell shall be designed
for approximately 10 kg/cm2.
The copper tubes shall be rolled into grooves on tube sheets for a water and airtight
joint. Joints between the tube/sheets and the shell should be watertight while those
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General Technical Specification
between the shell and the boxes should be airtight. Adequate sealing gaskets should
be used to prevent leakage of refrigerant and the infiltration of moisture and air into the
system.
The chiller shell shall have flanged water inlet and outlet connections welded as an
integral part of it.
A. Refrigerant liquid inlet and gas outlet connections with flanges and liquid line,
shut-off valve,
B. Liquid distributor with proper circulating arrangement,
C. Thermostatic expansion valve,
D. Solenoid valve on liquid inlet line,
E. Cooling and anti-freeze thermostats,
F. Water inlet/outlet connections with flanges and shut-off
valves, along with counter flanges.
G. Vent connections with valves,
H. Pressure and temperature gauges at the water inlet/outlet.
I. Relief valve, purge valve, drain valve, shut-off valve,
J. DP switch across the chiller.
Expansion valves shall be pilot operated type. Solenoid valve shall be provided for
'Pump down' operation of the unit.
Moisture indicators, filter/drier unit shall also be provided in the liquid line with isolating
valves.
Strainers shall be of brass, complete with bronze screen and permanent magnet
strainers shall be installed up-stream of refrigerant solenoid valves, as per
requirements. Strainers shall be provided with isolating valves and valves bypass.
Heavy duty seamless steel pipes shall be used for the piping network; while seamless
solid drawn copper tubes shall be used for the refrigerant liquid line.
The piping network shall incorporate loops in the circuit to efficiently separate oil and
liquid refrigerant from the gas and suction vapour respectively.
All horizontal lines shall be pitched to 12 m for every 3 meters in the direction of
refrigerant flow. All necessary loops and bends shall be provided to ensure proper
return of oil to the Compressor. All the piping shall be adequately supported and
isolated by means of suitable vibration isolators.
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General Technical Specification
All the piping network shall be pressure tested, leak tested, dried, evacuated and
charged with the refrigerant after erection.
• Pressure gauges
Pressure gauge shall not be less than 150 mm diameter dial with appropriate working
range and be complete with shut off gauge cocks etc., duly calibrated before
installation. Pressure gauges shall be provided at the following location.
In refrigerant line suction side gauges shall be compound gauges of the range 0-75
mm (0.3") mercury vacuum and 4 kg/sq. cm positive pressure. Discharge side gauge
0-6 kg/sq cm pressure. Gauge shall be connected to pipe by 6 mm dia copper tubing
through 6 mm dia shut off cocks.
• Thermometers
Thermometers shall be 150 mm dial type with capillary tube and protective sheets,
duly calibrated before installation .
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer.
1. Refrigerant Compressor
a) Manufacturer
b) Model No.
c) Refrigerant
d) Capacity at operating conditions
e) Maximum speed/operating speed
f) BHP at operating conditions
g) BHP/TR at operating conditions
h) BHP consumption
100% load
75% load
50% load
Make :
Type :
Rating (KW) and rpm :
2. Condenser
a) Manufacturer
b) Shell diameter and length (mm)
c) Tube material
d) Fouling factor
e) No. of tubes
f) Tube diameter (mm) and thickness
g) Tube length (mm)
2
h) Tube surface area inside (m )
2
i) Tube surface area outside (m )
j) No. of passes
3
k) Water flow (M /hr)
l) Water velocity (m/sec)
m) Water temperature entering (Deg.C)/leaving (Deg.C)
n) Fin material and No. of fins/inch.
o) Opearting charge
p) Pressure drop
q) Refrigerant temp (Deg. C)
r) Maximum cooling capacity (K.Cal/hr.)
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General Technical Specification
3. Chiller
a) Manufacturer
b) Shell diameter and length (mm)
c) Tube material
d) Fouling factor
e) No. of tubes
f) Tube diameter (mm) and thickness
g) Tube length (mm)
2
h) Tube surface area inside (m )
2
i) Tube surface area outside (m )
3
k) Water flow (M /hr)
l) Water velocity (m/sec)
m) Water temperature entering (Deg.C)/leaving (Deg.C)
n) Fin material and No. of fins/inch.
o) Pressure drop
q) Refrigerant temperature inlet /outlet (Deg. C)
r) Maximum cooling capacity (K.Cal/hr.)
s) Operating weight (kg)
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Chain Pulley Block with all accessories complete in all
respect. Specific technical requirement of Chain Pulley Block if any shall be mentioned in
the job specification/data sheet as furnished along with the Technical Specification.
Brief description of the Chain Pulley Block is given below under clause No. 02. The
equipment-wise list of data to be furnished by the tenderer along with the offer is shown
below under clause No. 03.
02 Description
Indian Standard
Hand-operated chain pulley blocks are used extensively for material handling during
construction, erection and maintenance of industrial plants.
The minimum requirements of load chains shall be graded to Grade 40. Further a design test
to prove the design of the block to a factor of safety of 4 has been included.
This standard lays down the general requirements and testing of the hand-operated chain
pulley blocks, worm or spur gear type.
Hand-Operated Chain Pulley Blocks - A block riveted with a load chain and operated by a
hand chain so as to give a mechanical advantage.
DESIGN - The blocks shall be so designed that all components shall withstand without
failure, an application to the block of a load equal to at least four times the working load limit.
RATING - The hand-operated chain pulley blocks shall be rated according to the working
load limit which in case of a block with four or fewer falls shall be determined from the safe
working load of the load chain. Where the falls exceed four, or angles are introduced into the
chain run, a chain stronger than that for the corresponding four-fold block is required to
provide for the additional load caused by friction.
Each chain pulley block shall be subjected by the manufacturer to a proof load of 1.5 times
the working load limit through a lenght of lift which will ensure that every part of the block will
sustain the load test.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Cooling Tower with all accessories to make operation of
Cooling Tower complete in all respect. Specific technical requirement of Cooling Tower if
any shall be mentioned in the job specification/data sheet as furnished along with the
Technical Specification.
Brief description of the Cooling Tower is given below under clause No. 02. The equipment-
wise list of data to be furnished by the tenderer along with the offer is shown below under
clause No. 03.
Job specification of the project shall be referred for any specific requirement.
02. Description
Cooling tower shall be power driven or natural draft type shall be selected as per job
specification requirement.
In General FRP type cooling tower shall be provided for the cooling of condenser recirculating
water for HVAC application.
The capacity of the cooling tower shall be adequate to take care of the entire cooling water
required for the air-conditioning plant. Only make up water will be made available from the
plant network.
Normally natural draft cooling tower shall have RCC basin construction. Alternatively the party
may offer for wooden basin as per job specification requirement. Cooling tower capacity shall
o
be adequate to cool water basin temperature up to maximum 32 C as per prevailing ambient
condition.
Cooling Tower
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General Technical Specification
(i) Level switch at cooling tower basin (to be interlocked with pump)
(ii) Make up connection with float valve (float made of copper) , back up ball valve
(iii) Quick fill connection with ball valve
(iv) Overflow connection
(v) Drain connection with ball valve
(vi) GI wire mesh 18 gauge strainer
(vii) Equalizing line of cooling towers with isolation valves
(viii) Cooling tower basin (for chilled water plant) shall have minimum 5 minute water holding
capacity (of circulation water volume)
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer for cooling tower.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply/fabrication of Cyclone / Multi-clone/Pre-collector System with all
accessories required to be installed for dust extraction / process application to achieve desired
performance in all respect. Specific technical requirement of Cyclone /Multi-clone/Pre-collector
System if any shall be mentioned in the job specification/data sheet as furnished along with the
Technical Specification.
Brief description of Cyclone /Multi-clone/Pre-collector is given below under clause No. 02.
The point wise list of data to be furnished by the tenderer along with the offer is mentioned
below under clause No. 03.
02. Description
This consists of a vertical cylindrical body, in which dust-laden gas is introduced at the top
through horizontal tangential inlet. The cylinder has a truncated cone as the lower section.
As the gas moves down the cyclone body, it forms a peripheral vortex. This gives rise to
centrifugal force, which throws the dust particles in the gas stream towards the walls which
then separate from the gas stream and fall down and are taken out through a dust pipe. As
the gas reaches the conical portion, the gas stream reverses direction and moves upwards
towards the exhaust pipe forming an inner vortex. Cyclones shall be constructed of suitably
stiffened mild steel casing of not less than 6 mm thickness. For variable flow application
compartmentalized cyclone chamber shall be constructed to maintain required minimum
velocity to achieve desired performance .
02.2 Multi-clone
This shall consist of a number of small diameter cyclones operating in parallel. Multi-cell
cyclones shall be enclosed in suitably stiffened mild steel casing of not less than 6 mm
thickness. The cyclone elements shall in general have diameters of 150 mm and below and
shall have smooth finished surfaces.
Each unit shall include, but not be limited to the following: gas inlet chamber,
cyclone elements with casing, clean gas exhaust chamber, bottom hopper for
dust collection, rotary valve for each hopper, a differential pressure gauge to
measure pressure drop across the unit and leak proof access openings. For
variable flow application compartmentalized cyclone chamber shall be constructed to
maintain required minimum velocity to achieve desired performance .
02.3 Pre-Collector
The collector shall be used as a preliminary dust catcher and a common header for different
incoming ducts from various suction hoods. The collector shall comprise cylindrical casing
with service doors of quickly clamped type, incoming and exhaust manifold connected to
collector, rotary air lock / double flap valve at the bottom. The dust accumulated at the
bottom of collector shall be disposed off through rotary air lock / double flap valve to the
conveyor. The velocity of air inside the collector shall be around 4-5 m/s. The Tenderer shall
compute the diameter of the collectors to achieve this velocity. The length of the collector
shall depend on the convenience of connecting various ducts to it. Duct connections should
not be bunched in a particular area and shall be evenly distributed on the cylindrical surface
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General Technical Specification
of the collector. The mode of connecting incoming ducts with collector body shall be of
flanged type. The air shall enter the collector tangentially and not radially. The exhaust duct
shall be fitted to the exhaust manifold by flanged connection. The body and support of the
collector shall be designed to withstand its self weight along with the weight of water and
dust considering worst conditions.
The tenderer along with the offer shall furnish the following data.
a) Pre-collector
b) Cyclone
c) Multi-clone
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of different type of air dampers required to be installed in the
Air Flow Path with all accessories for HVAC system. Specific technical requirement of air
dampers if any shall be mentioned in the job specification/data sheet as furnished along with
the Technical Specification.
Brief description of dry air dampers is given below under clause No. 02. The point wise list
of data to be furnished by the tenderer along with the offer is mentioned below under clause
No. 03.
Self acting dampers are provided to maintain pressurisation inside the premises.
The damper shall be multiblade type made of Aluminium flaps of not less than 24G
thickness and MS frame. These shall be designed to operate when the positive
pressure inside the premises exceeds 2-3 mm WC. It can operate in fully open or
partial open positions.
Fusible link fire dampers are provided to stop the flow of air through the exhaust
opening when fire breaks out in the premises. This damper shall be provided at the
inside face of wall opening to be provided for outlet/exhaust of air from the premises.
This damper shall essentially consist of multi-leaf blades. MS frame, fusible link with
spring/gravity arrangement of auto closing of the damper. The fusible link shall be
o
made of low melting alloy which can fuse at a temperature of about 70/80 C. The
damper shall be normally in open position; it shall close on melting of the fusible link
caused by temperature rise due to fire etc. in the premises.
The hand operated damper shall be multileaf opposite acting aerofoil blade type
damper with external operating links provided at the outlet of the fan for controlling
air flow. The damper shall be made of GI sheet with MS frame unless otherwise
specified in the TS. The fully close/ open/ partial closing position shall be marked on
the damper casing.
The electrically operated damper shall be provided as a regulating device for control
of air flow through duct as per TS requirement. Provisions shall be kept for
interlocking the damper with fire protection system. The fully closed / open / partial
closing position shall be marked on the damper casing.
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General Technical Specification
This damper shall be provided in supply air duct. It shall be operated by solenoid
which is to be interlocked with the fire detection system of the served premises. In
case of fire in the premises the fire detection system shall activate the solenoid and
the solenoid in turn shall close the damper to stop air flow in the duct line. The fully
close/open position of the damper shall be marked on damper casing.
The following data shall be furnished by the tenderer along with the offer.
1. Size
2. Quantity offered
3. Material of construction and its thickness
i) Frame
ii) Blade
iii) Flange
4. Provision of horizontal & vertical direction control
5. Weight
6. Velocity of air
1. Type of actuator
2. Supply voltage and solenoid power supply rating
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply/fabrication of Ducting Network with all accessories required to
be installed for Dedusting System application to achieve desired performance in all respect.
Specific technical requirement of Ducting Network of Dust Extraction System if any shall be
mentioned in the job specification/data sheet as furnished along with the Technical
Specification.
Brief description of Ducting Network of Dedusting System is given below under clause No.
02. The point wise list of data to be furnished by the tenderer along with the offer is
mentioned below under clause No. 03.
Ducting Network shall comprise of suction hood, ducting, duct support, measuring hatch,
cleaning hatch and duct line dampers as required.
The suction hoods and enclosures shall be constructed of 5 mm MS plate unless otherwise
specified in the job specification with necessary external stiffeners, flanges, counter flanges,
fasteners, gaskets and other accessories for fixing with technological equipment and duct
line.
Dust collection hoods and enclosures shall be fitted with conveniently placed hinged access
doors (top hinged type) to enable internal access to the equipment for maintenance as
required. The air velocity at hood inlet shall be 1.5m/Sec (max).
1) Construction
The duct sizing shall be so selected to maintain proper conveying velocity throughout the
system. Man holes/hand holes and dust outlets shall be provided at intervals to facilitate
cleaning of dusts and for disposal of dust. The successful tenderer shall design the
dedusting system ductwork connecting the dust collection hoods, to the dust collector, fans
and stack. The ducting shall be fabricated from M.S.(IS : 2062- 1999 ) having
thickness as follows unless otherwise specified in the job specification :
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General Technical Specification
At all duct bends (carrying abrasive dust such as sinter dust etc.) above 900 mm diameter shall
have abrasion resistant liners with caster wood / rock basalt/FRP in line with job specification
requirement .
For special application corrosion / abrasion resistant duct liner material of construction of FRP /
Linear material may be required to be installed in line with job specification requirement.
2) Conveying velocity
A conveying velocity of 18-25 m/Sec shall be maintained at all points in the ductwork
between dust collection hood and dust collection plant to ensure flow of air without settling
of dust .
6) Branches
Branch connections should be oriented to the top or side of the main with no two branches
entering at opposite sides.
7) Joints
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General Technical Specification
Matching flanges are to be bolted together with asbestos rope gasket or rubber gaskets. All
bolts and gaskets for jointing shall be included in the successful tenderer scope of work. All
duct joints are to be air tight to minimise air leakage
All inside building duct and duct along main structural building will be supported from plant
building structure. Duct supporting member's length height section will be decided during
detail engineering. To suit site condition supporting members may have to be modified by
the successful tenderer without any commercial implication to the purchaser. All outside
ducting network shall have independent duct supporting trestles.
Minimum horizontal clearance from road center line is 5 meters. It is the successful tenderers
responsibility to effect the dedusting system ductwork arrangement in accordance with the
design requirements set down in the specification and to the satisfaction of the
purchaser/consultant.
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General Technical Specification
establish routes both inside and outside building. This is to be done in conjunction with and
to satisfy the Purchaser.
13) The duct work will be pressure balance type. However, during testing and commissioning if
any throttle piece is required for adjustment of flow in any duct branch same will be carried
out by the successful tenderer without any commercial implication.
14) Flexible connection at inlet & outlet of fan and in the ducting network will be provided by the
successful tenderer as required.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer.
A. Ducting
2
1. M of duct work
2. Weight of duct work
3. Weight of supports and flanges
4. Material and thickness of duct work
B. Suction Hood
1. Material of construction
2. Measuring hatch provided or not
3. Capturing velocity
4. Hoods sizes
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply/fabrication of GI/MS Ducting Network with all accessories
required to be installed for HVAC application to achieve desired performance in all respect.
Specific technical requirement of Ducting Network if any shall be mentioned in the job
specification/data sheet as furnished along with the Technical Specification.
Brief description of Ducting Network is given below under clause No. 02. The point wise list
of data to be furnished by the tenderer along with the offer is mentioned below under clause
No. 03.
The ducting network comprises of ducting work, duct line dampers, down comer & supply air
diffuser with volume control damper (for HVAC system only), supply air grill/ adjustable
louver grill duct supporting arrangement, flexible connections etc.
All GI /Aluminium ducting work for airflow shall conform to IS 655-1963, Reaffirmed – 1999.
Galvanised steel sheet conform to IS–277–1992, Amendment 2002. .As per job specification
requirement ventilation duct may be fabricated from steel sheet conforming to IS –2062 –
1999, Amendment 2001.
a) Ducting work
Ducting work consists of main duct, branch ducts, bends, reducers, joints, access
doors etc. Duct work shall be complete with flanges, gaskets, stiffeners, fasteners
(nuts, bolts & washers), hangers, etc. as required. Minor modification of ducting
network may be required to suit site condition. GI Ducts shall be fabricated at site to
match with site condition. Alternatively ventilation duct work may be fabricated with
MS sheet in line with job specification requirement.
GI Ducting shall be provided with joints at 2.5-3m interval conforming to IS: 655-
1963 (RA 1999) as and where required. In case of flanged joints, the flanges shall
be of angle iron type riveted with GI sheet on duct perimeter. Flange joints should
be made air tight with use of felt gaskets.
Duct supports shall be provided to keep the ducting in position in aligned condition.
For proper distribution of air in the premises supply air grills (adjustable louver grills)
with volume control dampers shall be provided in the ducting work for ventilation
system and supply air diffusers with volume control damper shall be provided in the
ducting work for air conditioning system.
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General Technical Specification
Sizing of the duct shall be done for pressure balancing as well as to maintain the air
velocities in the ducting work as given below: -
The following accessories may be fitted in the duct line depending upon the job specification
requirement.
Joints :
In line with IS 655-1963 guide lines the type of transverse joints shall be follows unless
otherwise specified in job specification :
Sealing:
All construction joints and duct seams shall be reasonably sealed with bitumastic cold
emulsion or equivalent vapour seal.
Bends :
The interior of all ducts shall be smooth for free flow of air. The radius to bend shall be not
less than 1.5 D. Turning guide vane shall be provided in all large duct bends and bends with
radius less than 1.5 D for proper air flow.
Access door :
All main ductwork shall be accessible throughout using tight fitted hinged access doors,
provided with sponge rubber gaskets. Angle joints shall be provided with felt or rubber
gaskets for leak-tightness of the joints.
In case access doors are to be installed in the insulated ducts, the access door panel should
be insulated too with overlapping, such that it can be operated without damaging the duct
insulation and there should be no condensation either on the access doors or on the duct
when the plant is in running condition.
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General Technical Specification
1.25mm MS sheet shall be used for the manufacture of grill. All grills shall be
true to shape and shall be checked with a level gauge before being secured in
position. No distortion or warping is permitted.
All duct mounted grill shall be complete with rubber gaskets and flanged
holding frames of suitable design for the intended installation. They shall be
mounted on collar extending from the duct. No part of grilles shall project into
the main duct. The adjustable louver grill shall be provided with volume
control damper as well as double deflection flap/ grill for direction control.
d) Supply air diffuser with volume control damper for AC System only
In general the return air opening shall be provided above false ceiling in the wall
between served premises (control room) and A.C. plant room. The return air grill of
suitable size shall be provided at the A.C. plant room side face of the said opening
for smooth flow of return air. The air supplied in the served premises (control room)
shall come/return above false ceiling through the return air slit of 50~100 mm all
around false ceiling along the walls of the served premises. From there it shall pass
into the A.C. plant room through the return air passage. The return grill shall
comprise of horizontal fixed louvers made of 2 mm thick MS sheet, 50x6 thick MS
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General Technical Specification
flat placed vertically at middle of the louvers, 50x50x6 size angle frame all around.
Spacing of the fixed louvers in the grill shall be 25 mm.
f) Insulation
Sheet metal duct shall be acoustically and thermally insulated as per requirement.
For details of insulation refer respective equipment specification.
g) Flexible connections
Flexible material shall be used for fabrication of flexible connections of at least 100
mm length shall be provided at each connection between duct work and fan units
and any other places as asked in the job specification. Flexible connection material
shall be selected considering temperature, pressure application of the job
specification requirement.
All duct work shall be provided with adequate supports as required to ensure rigid
support and to prevent vibration.
The fixing and supports interval shall not exceed 3 meters. Hanger rods having U-bend at
one end and threading at other end shall be hanged from angle clit to be anchor fastened
from. Hanger rod shall be attached to the ceiling by anchor/ expansion bolts. Duct angle
supports from brick wall/RCC wall/ structural wall shall be grouted / welded to suite site.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offers.
a) Ducting
2
1. m of duct work
2. Weight of duct work
3. Weight of support and flanges
4. Material and thickness of duct work
5. Duct support type and material
6. Velocity of air.
b) Supply Air Grills (Adjustable louver grills) /Diffuser with volume control
facility
1 Size
2 Quantity offered
3 Material of construction & thickness
4 Provision of horizontal & vertical direction control
5 Weight
6 Velocity of air
7 Methods of volume control
1. Size
2. Quantity offered
3. Material of construction
4. Weight
5. Velocity of air
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply/fabrication of Electrostatic Precipitator (ESP) System with all
accessories required to be installed dust extraction / process application to achieve desired
performance in all respect. Specific technical requirement of Electrostatic Precipitator (ESP)
System if any shall be mentioned in the job specification/data sheet as furnished along with
the Technical Specification.
Brief description of Electrostatic Precipitator (ESP) System is given below under clause No.
02. The point wise list of data to be furnished by the tenderer along with the offer is
mentioned below under clause No. 03.
02. Description
2. Electrics
ESP system will comprise of multiple fields, unit/multiple cells Electrostatic Precipitator (ESP)
and its accessories such as Dust disposal system, Electrics and control, Instrumentation,
interlocks, Supports etc.
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General Technical Specification
Design requirement
1. The Electrostatic Precipitator (ESP) will be in general dry, horizontal flow type. It should be a
completely self-supporting unit, ready to be assembled on the foundation.
2. Configuration
The Electrostatic Precipitator will feature one gas pass design. with Compensator at inlet &
outlet of ESP.
a) The precipitator steel casing will be gas tight and of welded construction throughout.
Casing plate thickness will be 6 mm minimum unless otherwise specified in job
specification.
b) The precipitator must cope with the fan running at full output and the fan inlet
damper shut without suffering structural or mechanical damage. For gas cleaning
system, working pressure will be maintained as per system requirement. The normal
working pressure of suction and temperature will be considered as specified in job
specification.
c) The precipitator will have access openings ladders, will stairs, platform etc.
necessary for inspection, cleaning and maintenance. All equipment and the
openings will be made accessible to the maintenance personnel by installation of
access ways, ladders, platforms etc.
d) Sealing of glands, inspection doors, etc. must be such that air is prevented from
leaking into the electrostatic precipitator to prevent in filtration of ambient air. The
precipitator will be of weatherproof construction.
4. Electrodes
a) The discharge electrodes will be of rigid ribbon type so that they can withstand
efficient rapping and temperature changes.
b) Collecting electrodes will have a spacing of approximate 400 mm. The collecting
plates should be 1.5 mm thick CR sheets to ensure an adequate service life.
5. Rapping
The electrode rapping system will be capable of maintaining clean electrodes. The supplied
rapping mechanism will feature a microprocessor based adjustable rapping frequency for
each field.
6. Insulator housing
Special attention will be given to the support rapping shaft insulators. These will be
electrically heated to avoid condensation and will have efficient seals to avoid dust deposits.
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General Technical Specification
7. Safety
The Electrostatic Precipitator will be provided with a key interlocking system for preventing
access to high voltage internals of the precipitator until the associated high voltage system is
de-energised and grounded. All the access opening will be provided with earthing rods. The
earthing strips will be of GI and it will be firmly bolted to the precipitator casing.
8. Hoppers
Each field of the Electrostatic Precipitator will be fitted with a dust hopper. The hopper will be
constructed of 8 mm plate unless other wise specified in TS . The hoppers will have a
pyramidal / conical configuration with 65°valley angle minimum.
Inspection doors, poke holes and electric heaters will be provided in the hoppers. Motorised
double cone valves will be provided at the hopper discharge. High and intermediate level
switches will be installed in each ESP hopper. With the help of intermediate level switch dust
in hopper can be discharged into the chain conveyor by double cone valve. High level switch
in ESP hopper will be provided for safety interlocks. Stainless steel liner of 1.6 mm thick up
to a height of 1.2 m from the bottom flange of ESP hoppers and storage hopper will be
provided for smooth flow of dust.
Separate dust-dumping outlets with flange provision, necessary chutes, gates etc. will be
provided by Successful Tenderer with each ESP hopper and dust storage hopper for
dumping of dust in case of increase in alkali content to prevent recycling of dust under
emergency situations as per requirement. Therefore, Truck / dumper entry provision below
each ESP hopper will be provided by Successful Tenderer for dust disposal.
9. Insulation
ESP walls, roof panels, and hoppers will be provided with thermal insulation of resin bonded
mineral wool of density 100 kg/m3 as per IS 8183-1993 having 50mm thickness for hot gas
application. The thermal insulation will be covered with 0.8 mm CGI sheet cladding.
The minimum platform width will always be 1.00 meters. The platforms will be located at the
top of hoppers level and at the top of the gas cleaning equipment. Safe guard rails will be
provided around all the platforms. Angular rather than round rails members will be used, if
possible. Safe and easy access to the platforms will be provided by providing stairways to
chain conveyor platform level, ESP chamber access door level, ESP top and transformer
house etc. Maintenance platforms all over ESP area, at dust disposal conveyor level will be
provided. Access door to ESP chamber will be provided from both side. Access doors to
distributor grid will also be provided. Maintenance platforms at access door level all around
ESP will be provided. Ladder approach with platform will be provided for hopper level
switches, access doors, hopper heater and for any other equipment or access above man
height.
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General Technical Specification
Keeping in view the properties of the dust, the Successful Tenderer will make selection of
material and thickness of plates and supporting structure. However, minimum material of
construction specification shall be as mentioned above.
The construction of the ESP housing and design of dust disposal gates, insulator boxes and
discharge electrodes will be such that air infiltration inside ESP housing is negligible to
prevent corrosion problem.
DESIGN CRITERIA
1. Following technical input parameters will be considered as a general guide line only for
designing the ESP cleaning system since the actual gas & dust composition and condition of
gases changes based on operation / process condition of technological plant. Based on the
job specification data as well as the past experience of successful tenderer and their
collaborator on design of ESP for technological process, successful tenderer will
demonstrate and establish performance guarantee parameters under varying process
parameters.
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General Technical Specification
< 5micron :
5-10 micron :
10-20 micron :
20-30 micron :
30-40 micron :
> 40 micron :
The efficiency of the ESP will be such that the guaranteed emission of dust from stack will
3
not be more than 50 mg/Nm or as per job specification requirement.
Correction curves for calculating revised efficiency will be applicable for change in following
input parameters:
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a) Temperature : Design
temperature will be considered as defined in the
TS.
3. The Successful Tenderer will adopt the following criteria while designing dust disposal
system.
4. The equipment will be suitable to operate satisfactorily under such variations of load,
pressure and climatic conditions as may occur during working.
5. Working parts of all equipment will be suitably located for convenient operation and will allow
access to facilitate easy replacement, connecting up, inspection, lubrication, maintenance
and repair, without dismantling other equipment/ components/ structures.
6. The Successful Tenderer will do physical model testing for gas flow distribution study inside
ESP at a minimum scale of 1:15 for this project at manufacturer’s works for designing and
selection of GD screen. Necessary inside model elements of ESP like GD screen, discharge
electrodes, collecting electrodes etc. will be fitted with the model as per scale. Purchaser
and purchaser’s representative will witness the above testing at manufacturer’s works. The
date of witnessing of the test will be informed by the Successful Tenderer during design
engineering.
7. Design calculation of ESP main supports, weather enclosure, structures, platform will be
based on IS-875-1987 Part-I, II & III and IS-800-1984. Service load of 4KN/sqm and 2
KN/sqm will be considered for maintenance platform and walk ways respectively.
8. Compensator between rotary feeder and the chain conveyors, between two conveyors and
between dust moistener and rotary feeder will be provided to facilitate maintenance. Slide
gates will be provided before all the double cone dust valves/rotary feeder. For calculation
and design of structural members, accidental fill up of dust up to top of ESP hoppers in worst
case will be considered by Contractor.
9. To ensure safe and reliable operation of ESP, the Successful Tenderer will provide the
following minimum safety measures.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of different type of dry air filters required to be installed in the
Air Flow Path with all accessories for HVAC system to achieve desired efficiency of cleaning.
Specific technical requirement of air filter if any shall be mentioned in the job
specification/data sheet as furnished along with the Technical Specification.
Brief description of dry air filter is given below under clause No. 02. The point wise list of
data to be furnished by the tenderer along with the offer is mentioned below under clause
No. 03.
Dry panel type air filter shall be of high efficiency cleanable type, constructed out of HDPE (6
ply) supported by layers of GI wire gauge. It shall be corrugated to the depth of filter casing
in order to increase the ratio of filtration area to frontal area. It shall be covered by strong
GI/MS frame and have space to ensure uniform distribution of air. Filtering panel shall be of
standard size which can be mounted on angle frame in multiple number as per capacity of
the fan. Face velocity of air shall not exceed 1.5 m/sec. The resistance of air filter shall not
exceed 10 mm WC when dirty. Efficiency of the normal air filter shall not be less than 90%
down to 10 microns unless otherwise specified in the TS. Cleaning efficiency of the high
efficiency air filter shall not be less than 99% down to 5 microns unless otherwise specified
in the TS. Absolute filter as required shall be considered in line with job specification
requirement. The whole filter and frame assembly shall be mounted at the wall / at the inlet
of tube axial flow fan/ metallic box as required Panel type air Filters testing shall conform to
IS-7613 –1975 ( Reaffirmed – 1996)
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General Technical Specification
The tenderer along with the offer shall furnish the following data.
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General Technical Specification
01 t
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Insulation with all accessories for HVAC application.
Specific technical requirement of Insulation if any shall be mentioned in the job
specification/data sheet as furnished along with the Technical Specification.
Brief description of the Insulation is given below under clause No. 02. The equipment-wise
list of data to be furnished by the tenderer along with the offer is shown below under clause
No. 03.
The insulation of water piping, air-handling units, ducting, chillers etc. shall be carried out as
per following specifications (a) to maintain proper temperature of fluid/vapour in the conduits
(b) to prevent surface condensation on cold surfaces.
1. Insulation Materials :
The materials to be used for insulation shall be as follows, unless some other material is
specifically mentioned elsewhere.
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General Technical Specification
3.0 Ducting :
The air handling ducts shall be insulated with resin bonded glass/mineral wool with density not below
24/48 Kg/M3 with polythene back bessian on outer side. Duct insulation thickness shall be as follows :
Clean the surface with wire brush to make it free from rust etc. Apply two coats of hot bitumen
85/25 to the surface at a ratio of 1.0 Kg/M2 for first coat & in patches for second coat wrap the duct
with insulation blankets of the specified thickness. Apply PBH layer on the outside and reinforce it by
tying GI wire of 0.5 mm at interval of 450 mm.
Duct in outdoor areas exposed to weather shall be covered with 24 SWG Aluminum sheet bent true
to shape and secured with self-tapping screws and over lapped joints sealed with Loidseal – 94.
The first 4.5 meter length of duct starting from each fan outlet shall be provided with insulation for
acoustic purposes. The insulation material already specified in clause 2.2.2. Then it shall be
covered 0.56 mm perforated Aluminium sheets.
The duct surface shall first be cleaned from inside. The insulation boards shall be wrapped in Glass
Cloth of 7 mil thick. With ends stitched. The boards shall be fixed inside the duct. The insulation
shall then be covered with 0.56 (24 SWG) perforated Aluminum sheets.
The sheet and the insulation, shall be secured to the duct by means of cadmium plated bolts, nuts
and washers and the ends should be completely sealed off so that no insulation material is exposed.
Insulation material shall be resin bonded glass wool/mineral wool of density 32/48 Kg/M3 of 50 mm
thickness.
Fix 40 mm x 50 mm Deodar/Kail wood battens at 500 mm intervals longitudinally. Then fix cross
battens at 1.0 meter C – C using suitable gutties and brass/SS Screws.
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Fill each rectangle with 50 mm resin bonded glass/mineral wool wrapped in glass cloth. Then tie
with 24 SWG GI wires at 300 mm intervals. Then cover with 24 SWG (0.56 mm) perforated
Aluminum sheet having 3 mm perforations at 6 mm C – C. Overlap all the joints and provide beady
of 25 mm by 1.5 mm MS flat.
Walls : Two of the walls enclosing the room starting from 1 ft. above the
floor up to the ceiling.
6.0 Measurement :
The measurement of insulation of vessels, piping and ducts shall be made over the insulated surface
area as per IS : 7240 – 1981.
03 DATA TO BE FURNISHED BY THE TENDERER ALONG WITH THE OFFER FOR INSULATION
OF HVAC APPLICATION
The following data shall be furnished by the tenderer along with the offer.
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01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply of Insulation with all accessories for hot surface application. Specific technical
requirement of Insulation if any shall be mentioned in the job specification/data sheet as furnished
along with the Technical Specification.
Brief description of the Insulation is given below under clause No. 02. The equipment-wise list of
data to be furnished by the tenderer along with the offer is shown below under clause No. 03.
Thermal insulation shall be provided for all vessels, equipment, pipe fittings, heat exchangers etc.
containing fluid or vapour for which it is necessary to (a) Conserve heat (b) Maintain temperature for
process control (c) provide for personnel protection.
Thermal insulation system shall be selected so as not to result in a residual heat loss exceeding 150
Watts/M2 under plant operating conditions measured over insulated surfaces. For design, the
following data are specified:
o
Ambient air temperature : 45 C (Max.)
Wind velocity : 1 m/sec.
o
Surface temperature : Not to exceed 15 C above ambient
Design should include de-rating factors of direct conduction paths e.g. spacer rings and stitching
wires normally associated with blanket type insulation material.
• For surface preparation wire brush shall be used to remove rust, dust or oil etc. thoroughly.
• Fix the pre-formed pipe-section insulation of required thickness against each diameter of pipe as
per the Thickness requirement for Temperature glass and pipe diameter. Construction (upto
75mm thick – 1 layer thereafter 2 or 3 multi layer) joints should be staggered so that complete
breaks are minimum on single layer insulation and no through joints occur in multi layout work.
The insulation must be held in position by strapping with 20mm x 24 SWG Aluminium Straps.
• When lightly bonded rock wool mattress are used, they shall be wrapped around the pipes
without any under layer. On top of each layer, the wire netting already on top of mattresses
should be tightly butted against each other so that the fibers interlock both along the longitudinal
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and circumferential joints. The pipe joints shall be stitched with 22 SWG soft GI lacing wire for
pipes upto 400mm O.D. For pipes over 400mm O.D., the mattresses should be further secured
by strapping with 20 mm x 24 SWG Al. straps at 500mm intervals.
• All uninsulated flanges, pipeline insulation shall be stopped off at a suitable distance from the
flange for facilitating withdrawal of bolts without disturbing insulation.
• In regard to supporting of insulation to vertical pipelines it is essential that all the pipe insulation
(above 200 NB pipe) should be supported at minimum of 3.0 meters distance by applying
insulation support spider clamps. These clamps are fitted around the pipeline bare surface with
projecting legs whose length should not be more than 70% of insulation thickness.
Removable covers shall be provided over all flanges and valves whenever they are insulated with
preformed materials. These covers over valves and flanges shall have provision for quick – release
clips.
All pipes shall be covered with Aluminum sheet (Aluminum sheet of 24 SWG/0.56mm upto
325mm O.D. inclusive of insulation thickness and Aluminum sheet of 22 SWG/0.71mm beyond
325mm O.D.) conforming to IS:737, to the outside of the insulation with minimum 25mm
circumferential and longitudinal over laps. The over lapping should be grooved so as to prevent
ingress of water into the insulation. In horizontal piping, joints shall be arranged at an angle of
o
30 to 40 from the horizontal so as to shed rain water.
When lightly bonded rock wool mattresses have been used as the insulation material, spacer
rings shall be required screwing the Aluminum sheet. The sheet metal shall be secured to
themselves by self-tapping screws at a pitch not exceeding 150mm.
After securing the Aluminum sheet, the overlapped joints of the sheet metal shall be sealed with
metal sealant to make joints perfectly waterproof.
• The surface to be insulated shall be thoroughly cleaned by wire brushing to remove dirt,
loose scales, dust etc.
• Where welding is permissible, weld 10 SWG GI spokes at 300 – 400mm diamond pitch.
• `L’ shaped lugs to be fixed to the spacer rings made of 25mm x 3mm MS flats at 450mm C –
C with 25mm x 25mm x 3mm asbestos mill board washers and 4mm MS rivets.
• The spacer rings shall be fixed around the tank at 900mm C – C by welding `L’ shaped lugs
to tank body.
• Impale Rock wool lightly bonded machine stitched mattresses with one side wire netting of
o o
required density (upto 400 – 100 Kgh/M3, above 400 C – 120 Kg/M3) and thickness with
the ends of mattresses butted closely together with lacing wire of 22 SWG. In addition,
mattresses shall be secured with tightly tensioned circumferential Aluminium bands at
approx. 450mm pitch.
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• The Aluminium metal cladding (22 SWG/0.71mm) is to be fixed on the spacer rings with self-
tapping screws at 150mm C – C.
• All over lapped joints of Aluminum sheet metal shall be sealed with loidseal-94 to make
joints waterproof.
Expansion joints shall be provided in the insulation to allow for movement and expansion of the
pipe or vessel without producing random craAt the expansion joints, there shall be complete cut
and the cutout portion shall be 25mm wide and dry filled with loose insulation material the
density of which shall be equal to that of the basic insulation. cking of the insulation. The
expansion joints wherever necessary shall be installed by overlapping the cladding material.
o
Pipe temp. C Spacing of Expn. Joints in meters
o
Upto 200 C No Expn. Joint.
o
201 to 300 C 3.5
o
301 to 400 C 3.0
o
Above 400 C 2.0
Note: For piping upto 325 mm OD (including insulation thickness) aluminum sheet thickness –
24 SWG (0.56mm) and beyond 325 mm OD (including insulation thickness) aluminum
sheet thickness – 22 SWG (0.71mm).
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03. DATA TO BE FURNISHED BY THE TENDERER ALONG WITH THE OFFER FOR INSULATION
OF HOT SURFACE APPLICATION
The following data shall be furnished by the tenderer along with the offer.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Package Air Conditioner with all accessories to make operation
of Package Air Conditioner complete in all respect. Specific technical requirement of Package
Air Conditioner if any shall be mentioned in the job specification/data sheet as furnished along
with the Technical Specification.
Brief description of the Package Air Conditioner is given below under clause No. 02. The
equipment-wise list of data to be furnished by the tenderer along with the offer is shown
below under clause No. 03.
02 Description
The water/air cooled packaged air-conditioner will be designed for continuous duty.
The equipment shall be designed, manufactured and tested as per IS:8148- 1976 (RA
1995).
The packaged unit shall comprise compressor, cooling coil, refrigerant circuit, fan, air filters,
electric drives and controls, instruments and other necessary standard accessories
assembled in packaged form in a steel cabinet.
All electrical connections shall be built in, Purchaser will provide the power supply load.
Each package air-conditioner will essentially comprise of compressor, cooling coil, refrigerant
circuit, condenser, blowers, air filter, electric drives, instruments and controls and other standard
accessories assembled in steel cabinet.
The condenser will be water cooled, shell and tube type with effective surface area for heat
transfer taking into consideration the scale factor for water side and optimum number of passes
to achieve desired duty conditions water cooled package AC unit. Provision will be made in the
steel cabinet for tube side cleaning during maintenance. The condenser will also serve as
refrigerant receiver of refrigerant circuit with fusible relief plug. Alternatively as per job
specification requirement condenser may be air cooled with fins and tube type with effective
heat transfer area taking into consideration high ambient temperature of site selected. A
refrigerant receiver shall be provided in the refrigerant circuit. Air cooled condenser along with
the fan shall be installed in the free area for movement of outside air through condenser tube for
effective cooling of refrigerant.
Cooling coil will be direct expansion type with integrally finned copper tubes and fitted with
equalising distributors to ensure equal amount of refrigerant in each circuit. Condensate drip
pan will be provided below the cooling coil for collecting the condensate.
The refrigerant circuit will be completely piped at factory and charged with required amount of
refrigerant. The circuit will comprise of thermostatic expansion valve, distributor, liquid strainer,
liquid line shut off valve, dehydrator etc. The circuit will be protected with safety devices such as
high and low pressure cutouts, fusible plug, water flow/differential pressure switch, oil safety
switch, time delay relay etc. to protect the unit from damage due to sudden and serious
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General Technical Specification
fluctuations in operating conditions. The refrigerant will be R22 / ANY OTHER OZONE
FRIENDLY REFRIGERANT.
For control of temperature and dehumidification of the conditioned premises, thermostat and
humidistat will be provided in the package A.C. plant room as per job specification requirement.
The centrifugal blower will be designed for distribution of the conditioned air through the network
of duct and supply air diffusers. The impeller will be of forward curved, dynamically balanced for
low noise and vibration free operation. The fan will be coupled with motor by V-belt and
mounted on anti vibration mounting.
The necessary control and instruments include thermostatic expansion valve, sight glass,
strainer, cooling thermostat, heating thermostat, humidistat, strip heater, shut off purge valve
and drain valve, dial type pressure and temperature gauges etc. Cooling thermostat and
humidistat will be provided in the return air circuit (in A.C. plant room) as per job specification
requirement.
The dial type 150mm dia pressure gauge will be provided with isolating cocks/ valves. Flow
switch will be installed in condenser water inlet line to stop the compressor while water supply
stops. High efficiency filter & strip heater will be installed in the supply air duct at the discharge
end of packaged unit and the strip heater will be interlocked with the blower of the packaged
unit to prevent independent control/ switching of heaters as per job specification requirement.
The blower and the evaporative coil sections of the packaged unit will be thermally insulated to
minimise thermal leakage. The unit will be supplied with rubber pad for installation on PCC
pedestals.
Circulating condenser water cooling pipeline will be provided with strainer and by pass line.
Minimum efficiency of pre filter unit in package AC will be 90% down to 10 micron.
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General Technical Specification
The following data shall be furnished by the tenderer along with the offer for Package Air Conditioner
Unit.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Propeller Fan with all accessories to make operation of
Propeller Fan complete in all respect. Specific technical requirement of Propeller Fan if any
shall be mentioned in the job specification/data sheet as furnished along with the Technical
Specification.
Brief description of the Propeller Fan is given below under clause No. 02. The equipment-
wise list of data to be furnished by the tenderer along with the offer is shown below under
clause No. 03.
02 Description of Equipment
This type of fan is used for general air exchange of the premises. The fan shall be heavy
duty and wall mounted type propeller fan design shall conform to IS:2312 – 1967
(Reaffirmed 1994). Fan impeller blade shall be of aerofoil section and mounted directly at
the motor shaft. The RPM of the fan preferably shall be restricted to 900 RPM. Noise level
should not exceed 85 dB(A) at 1 m distance. Air entry shall be from motor side. Louver
shutter/non-return damper shall be provided at the outlet side of fan to prevent back draft.
The fan shall be provided with fixing frame, supporting lugs and other standard accessories.
The following data shall be furnished by the tenderer along with the offer.
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General Technical Specification
01. General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply/fabrication of Centrifugal / Venturi Scrubber System with all
accessories required to be installed for dust extraction / process application to achieve
desired performance in all respect. Specific technical requirement of Centrifugal / Venturi
Scrubber System if any shall be mentioned in the job specification/data sheet as furnished
along with the Technical Specification.
Brief description of Centrifugal / Venturi Scrubber is given below under clause No. 02. The
point wise list of data to be furnished by the tenderer along with the offer is mentioned below
under clause No. 03.
02. Description
Centrifugal scrubber is essentially a vertical steel cylinder with conical bottom. Casing and
bottom are made of heavy gauge sheet steel. The top of the casing is connected to exhaust
fan and conical portion of the casing is provided with a hydraulic seal. The rectangular inlet
of the scrubber is welded to the casing tangentially with respect to its inside surface and with
o
a slant of 10 C toward casing. Dust deposited on the walls of the inlet duct is washed by
water sprayers.
The inside surface of the casing is continuously sprayed by sprayers. The water jet emerges
from sprayers in the same direction as the swirling air, and at the same time, tangentially to
the inside surface of the casing and thus washes it without producing any droplets. The
operation of nozzles is checked through inspection holes located just above them.
Dust laden air enters the bottom cylindrical part of the scrubber casing through inlet duct at
an approximate velocity of 20 m/sec. As it enters the scrubber, a portion of the stream is
directed upwards along a helical line, following closely the inside surface of the casing. The
remaining stream revolves and descends, rebounds from the scrubber bottom and rises
along a helical line but closer to cyclone axis. Both streams merge at the outlet.
A centrifugal force arising on rotation of the air stream ejects dust particles towards the
sprayed surface of the scrubber. The majority of the particles reaches the film of water and
are captured by it.
Water containing captured dust particles trickles down the casing wall and is removed via
the hydraulic seal. The protective baffle provided above the sprayers is intended to minimize
entertainment of droplets. The mean air velocity for the full cross section of the cylindrical
portion of the scrubber is taken to be 5.5 m/sec.
The efficiency of the scrubber should be sufficiently high so that the dust concentration in the
exhaust ducting shall not exceed 50 mg/Nm3.
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General Technical Specification
The venturi scrubber consists of high speed atomizer and centrifugal separator. High speed
atomizer consists of converging cone, throat and diverging cone. Air stream is accelerated in
converging cone and the velocity of the stream rises. Water is introduced at the throat,
where it is atomised due to high pressure
Dust laden air and water enter the throat, where they are mixed at high energy and extreme
turbulence. The throat with its length provides an extended period of thorough mixing. The
scrubbed air and entrained droplets (with contaminants entrapped) then enters the diverging
cone where further collisions and agglomeration takes place creating larger droplets. The air
stream then proceeds to centrifugal separator where liquid droplets due to their coarse size
are easily removed from the air stream. The working of the centrifugal separator is similar to
that of centrifugal scrubber except that the water sprayers are not required.
The efficiency of the venturi scrubber shall be sufficiently high so that the dust concentration
3
in the chimney does not exceed 50 mg/Nm or as per job specification requirement.
The tenderer along with the offer shall furnish the following data.
d) Centrifugal Scrubber
e) Venturi Scrubber
3
1. Make & Model & capacity in m /h.
2. Pressure drop in mmWC.
3. Overall size of venturi scrubber and centrifugal collector
4. Air velocity at inlet, throat & outlet of scrubber in m/sec.
5. Water quantity and pressure required for scrubbing at throat & slurry disposal at
centrifugal collector
6. Spray nozzle quantity, diameter and material of construction
7. Material of construction of scrubber body
8. Material construction of throat
9. Cleaning efficiency Vs particle size
10. Water sealing arrangement at bottom of centrifugal collector
11. Methods of slurry disposal.
12. Supporting frame details.
13. Total weight of pre-collector
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection, manufacture,
test and supply/fabrication of Stack with all accessories required to be installed for exhaust of air to
achieve desired performance in all respect. Specific technical requirement of Stack if any shall be
mentioned in the job specification/data sheet as furnished along with the Technical Specification.
Brief description of Stack is given below under clause No. 02. The point wise list of data to be
furnished by the tenderer along with the offer is mentioned below under clause No. 03.
02 STACK
1. Construction
Self-supported stack made of M.S. Plates (IS:2062-1999) shall be provided to discharge the
cleaned air from each of the system to atmosphere.
The height of the stack shall be as per CPCB norms i.e. 2-3m above the nearest highest
building or minimum 30m. Stack shall be fabricated as per IS – 6533-1989 (RA 1995) Part –
I & Part –II or as specified in TS .
2. Lightning Protection
Protection against lightning shall be made in accordance with IS:2309-1989 (RA 1995).
Vertical reinforcing bars near the stack base shall be electrically connected to a down
conductor. Similarly all steel parts and footing reinforcement should be connected to a down
conductor. At the top of the stack the lightning conductors shall be adequately protected
from chemical corrosion by applying a lead coating or by other suitable means.
Aviation warning lights shall be provided even during construction once the stack reaches a
height of about 45m above ground. Both temporary as well as permanent provisions shall be of
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General Technical Specification
neon type. These lights shall have sufficient intensity (about 100 lux) so that they are
conspicuous considering the back-ground illumination level against which they are viewed.
Day marking shall be provided by painting the stack in contrast colour bands for at least
the top one-third of its height. Such bands shall range from 0.75 to 3 m in width with the
outer bands in darker colour. The paint used for the bands shall be acid-resistant and shall
safely withstand the temperature expected at the top of the stack.
4. Staircase
The stack shall be provided with staircase, landing / resting platform at every 10 m,
handrails, painter's trolley, structures etc. Ring platform around stack shall be provided at
location of aviation lamps.
6. Sampling Ports
The sampling ports shall be provided as per Emission Regulation Part-III or its latest
ammendments.
7. Work Platform
a) Construction
Size and extent of platform : If two ports are required at 90 degres the work platform
should serve that half of the stack circumference between the ports and extend
atleast 1.2 meters beyond each port. If four ports are required at 90 degrees, the
work platform should serve the entire circumference of the stack. The minimum
platform width shall always be 1.2 meters regardless of diameter of stack and
number of sampling ports.
b) Platform Access
Safe and easy access to the platform shall be provided via stairway or other suitable
means.
Guardrails and Stairwells: A safe guard rail should be provided on the platform.
Angular rather than round rails members should be used, if possible. No stairwell or
any other opening shall be located within 1 meter of any port.
c) Platform loading
The work platform should be able to support atleast three men (average 80 kg each)
and 91 kg of test equipment (stack monitoring kit etc.). If the stack exists through a
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General Technical Specification
building roof, the roof may suffice as the work platform, provided the minimum test
site conditions are still met.
d) Clearance Zone
A three dimensional, obstruction free clearance zone should be provided around
each port. The zone should extend 0.6 m above, below, to either side of the port.
The zone should extend outward from the exterior wall of the stack to a distance of
at least 3 meters.
The tenderer along with the offer shall furnish the following data:
a) Diameter in mm
b) Material & thickness
c) Height in m
d) Level of sampling port holes
e) Level of platforms
f) Support & structure with stairs
g) Weather Cowl / telescopic duct connection
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Tube Axial Flow Fan with all accessories to make operation
of Tube Axial Flow Fan complete in all respect. Specific technical requirement of Axial Flow
Fan if any shall be mentioned in the job specification/data sheet as furnished along with the
Technical Specification.
Brief description of the Tube Axial Flow Fan is given below under clause No. 02. The
equipment-wise list of data to be furnished by the tenderer along with the offer is shown
below under clause No. 03.
02 Description of Equipment
These fans shall be of heavy duty type and of four kinds, as per service requirement, as
follows: a) Roof exhauster, b) Roof mounted supply air fan, c) Wall exhauster, d) wall
mounted supply air fan.
The roof exhauster / roof mounted supply air fan shall have multi-bladed impeller with short
duct casing while the wall exhauster/ wall mounted supply air fan shall have cone inlet
suitable for free discharge of air. The fans shall be capable of withstanding the stresses
which may be experienced during normal operation under the condition which it is required
for and during over speed test. The noise level shall not exceed 85dB(A) at 1m distance.
The first critical speed of the rotating assembly shall be at least 25% above the operating
speed. The speed of the fan shall preferably be limited to 1500RPM for fan with diameter
600mm or less and 960RPM for fans with diameter more than 600mm to limit the noise
generation.
Impeller:
The impeller shall be of cast aluminium alloy construction of high efficiency aerofoil section
blades. The fan impellers shall be cast in one piece, finished all over and carefully balanced
both statically and dynamically as per ISO - 1940. Finally the assembled rotor shall be
dynamically balanced.
Casing:
Axial flow fan casings for wall mounted/roof mounted fans and their components shall be
suitable for outdoor installation. The casing shall be minimum 2 mm thick. The casings shall
be provided with flanges at inlet and outlet. All nuts & bolts associated with it shall be of
zinc or cadmium plated. Easily removable inspection cover having galvanised fly nut shall
be provided. The covers shall be located such that the grease nipple for all bearings, and
also motor terminals are easily accessible through the cover.
a) Roof exhauster/supply air fans shall be provided with hood for protection against
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rain and other contingencies. It must ensure no dripping of rain water under any
circumstances and will have low pressure drop of air. The hoods shall be provided
with a heavy gauge expanded metal bird screen.
b) Rain protection cowls shall be designed to suit wall exhausters for protecting fans
from rain. The cowls shall be provided with bird screen of heavy gauge expanded
metal netting. The rain protection hood & cowl shall be fabricated from minimum
14G thick MS sheet (Hot dip galvanised).
Coned Inlet
Wall exhausters shall be provided with coned inlet made of MS 2 mm thick or 16G, GI sheet.
Inlet Screen
Inlet screen shall be manufactured with minimum 14 SWG galvanised wire knitted in 25 mm
square mesh. Suitable flanges to protect the edges of the screen shall be provided.
These fans & motor when used in explosive / inflammable fume extraction system shall be of
spark proof construction. Fan impeller and inside surface of the casing shall be epoxy
painted. In case of exposure to acid fumes, the fan along with drive motor, accessories &
supports etc. shall have acid proof painting.
Fan Drive
All direct drive axial flow fan impellers shall be directly mounted on extended motor shafts
special constructional features shall be applicable as for fan. Alternatively as per job
specification requirement bifurcated type V-belt drive may be considered.
Materials of Construction
The following materials shall be used for the construction of various parts:
The following data shall be furnished by the tenderer along with the offer.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply/fabrication of Valves with all accessories required to be
installed for exhaust of air to achieve desired performance in all respect. Specific technical
requirement of Valves if any shall be mentioned in the job specification/data sheet as
furnished along with the Technical Specification.
Brief description of Valves is given below under clause No. 02. The point wise list of data to
be furnished by the tenderer along with the offer is mentioned below under clause No. 03.
02. Valves
Gate valves will be provided at pump outlets & inlets & at tank outlets.
Pressure relief valves shall be provided at pump outlet to divert water back to the tank in
case downstream usage of water is reduced.
Globe valves shall be provided on sprinkler headers to control the flow through each
sprinkler.
Butterfly Valves shall be provided in water line of size 65 NB and above and
ball valve be provided for pipe size below 65 NB
Butterfly valve
The valves shall be provided with integrally moulded & bonded body liner to
provide perfect seating and complete isolation of body material from fluid.
The body liner shall provide the seating to valve disc, primary seal to the
stem & gasket joint with mating pipe flanges. Valves shall be provided with
self locking lever operation from open to fully closed position with
intermediate positions marked on the indicator plate mounted on the top
flange. The valves shall conform to BS : 5155 / IS : 13095. Extended valve
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shaft shall be provided so that the lever can be operated without any
obstruction on the insulated pipes. Gear operated valves shall be provided
for sizes more than 250 NB.
Ball Valve
Ball valves shall be with 200 mm length welded joint pipes from
manufacturer works.
Check valve
Type : Dual plate check valve with two springs hinged on a central hinge rod
Body : SG iron
Body liner : Nitrile rubber/ EPDM
Disc : ASTM A351 Gr CF8
Wafer design
The following data shall be furnished by the tenderer along with the offer.
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General Technical Specification
01 General
This specification outlines the minimum requirement for design, engineering, selection,
manufacture, test and supply of Window Type Air Conditioner / Split Type Air Conditioner
with all accessories to make operation of Window Type Air Conditioner / Split Type Air
Conditioner complete in all respect. Specific technical requirement of Window Type Air
Conditioner / Split Type Air Conditioner if any shall be mentioned in the job specification/data
sheet as furnished along with the Technical Specification.
Brief description of the Tube Axial Flow Fan is given below under clause No. 02. The
equipment-wise list of data to be furnished by the tenderer along with the offer is shown
below under clause No. 03.
Job specification of the project shall be referred for any specific requirement.
02. Description
Split air conditioning unit mainly comprises of two section, Indoor and Outdoor section.
Indoor section comprises of cooling coil, fan, supply air grill, filter. Outdoor section
comprises of air cooled condenser, blower, hermetically sealed compressor. Sealed
refrigerant piping inter connect indoor and outdoor section. Outdoor unit shall be
installed in open space for easy heat dissipation from condenser. Indoor section shall
be ceiling surpended or wall mounted type as per job specification requirement. Duct
lines may be connected at the outlet of fan in indoor section with strip heater as per
job specification requirement. Remote control unit, thermostat and other standard
accessories for successful installation of split type air conditioner shall be included in
the scope of successful tenderer. Any additional services required shall be included in
line with job specification requirement. Split air conditioner unit shall conform to
IS:1391-1992 Part II.
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The following data shall be furnished by the tenderer along with the offer.
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Integrated Iron and steel plant generates various type of waste during manufacturing of
saleable products. In addition to the main line of production of iron and steel the allied and
associated activities give rise to many waste which differ in composition, characteristics as
well as physical state.
Solid waste generated in steel plant can be classified in major two groups. One group will be
solid waste, which can be recycled/reused in the iron & steel making process in the plant itself
and the other groups contain solid wastes which cannot be used in technological process and
has to be disposed. Wherever it becomes unavoidable, the wastes shall be disposed under
controlled conditions. Disposal of waste shall be done in such a way that the pressure on land
and subsequent land contamination shall be progressively brought to minimum.
All efforts shall be made to minimize the generation of waste and maximize the effective
utilization of waste in the plant.
All waste from the pollution control system and treatment shall be used or recycled to the
extent possible.
As per Minutes of twentieth meeting of the Peer & core expert committee on Developments of
Effluent and Emission standards of Iron & steel plants held on Feb 19,2007 ,CPCB circulated
the following guidelines :
Hazardous waste generated in the plant shall be handled as per “The hazardous waste
(Management and handling) rules 1989 and subsequent amendment .
Fly ash and Bottom ash generated shall be managed/handled as per latest notification on
Ash management by Ministry of environment and forest, Govt of India.
Lead Acid batteries shall be handled and disposed as per Batteries (Management and
Handling) Rules 2001.
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