Vendormeetjvrchp - Coal Handling Plant (10mtpa Capacity) On Epc Project
Vendormeetjvrchp - Coal Handling Plant (10mtpa Capacity) On Epc Project
Vendormeetjvrchp - Coal Handling Plant (10mtpa Capacity) On Epc Project
1.1.2.1 GENERAL
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From reclaim equipment : 2 streams of 1600 mm. belt conveyors.
2.1.2.6 WEIGHTMENT.
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1.1.2.8 FIRE FIGHTING &PLANT CLEANING SYSTEM: For whole proposed CHP
06 Nos. of feeder breakers of 500TPH Capacity are provided to crush the coal. The
ROM Coal will be transported in 60T rear dumpers and unloaded into the hoppers of
feeder breakers. These 06 feeder Breakers are installed at two locations, each
location consists of 03 Feeder Breakers.
Total Coal handling system of JVR CHP is proposed for two streams i.e Stream A &
Stream B
Stream A- Transportation of G9 Grade coal from Quarry to G/L Bunkers.
Stream B- Transportation of G12 grade coal from Quarry to washery and washed G 9
grade Coal from washery to G/L Bunkers and in the event of any break
down at Washery theG12 directly fed in to the G/L Bunkers as per the
requirement.
1.2.1 Stream A:
03 nos. of 500 TPH Feeder Breakers(-) 200 MM are to be installed at surface
and the G9 Grade ROM coal will be transported in 60T Rear Dumpers fed into
the hoppers. Each feeder breaker is provided with a 1400mm width, 50m long,
1200TPH, belt conveyors (C1,C2 &C3).The crushed coal is transported onto
1400MM width, 760mtrs long and 2200 TPH capacity Conveyor(A1).
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The A1 conveyor Gantry will cross the washery Area over the 8mtrwide at a
height of 10mtrs and 150m long. A1 Conveyor will pass on to the gantry and all
along the 30 mtrsheight O.B dump and discharge on to A2 Conveyor. A2
Conveyor transport the G9 Grade coal and discharge on to 1400MM wide tripper
trolley conveyor(A3) for uniform discharge into G/L Bunkers. A2 Conveyor will be
lowered from 30mtrs height OB Dump to surface and again raised to 15
mtrsheight to discharge on to Tripper Trolley Conveyor(A3).
1.2.2 Stream B
03 nos. of 500 TPH Feeder Breakers(-) 200 MM are installed at surface and the
G12 Grade ROM coal is transported in 60T Rear Dumpers will be fed in to the
hoppers. Each feeder breaker is provided with a 1400mm width, 150m long,
1000TPH, belt conveyors (C4,C5 & C6). The output of each Feeder Breaker
transported through these conveyors and discharge into 100 T capacity steel
bunkers and from the bunkers the coal is transported into Washery by the Trucks
after weighing on 60T Lorry weigh bridge. Transportation of Coal by Trucks is not
under this scope.
After washing and other arrangements the G12 grade Coal converted to G9
grade.The washed G9 grade coal, after weighment on 60T Lorry weighbridge,
unloaded in to 60 T Lorry unloading Bunkers. 04 nos. of truck receipt RCC/Steel
hopper with suitable liner has been envisaged for this purpose. The truck receipt
hopper shall be located at Washery Area. Coal shall be reclaimed from RCC
truck receipt hopper by suitable capacity Reciprocating feeders to feed the
underneath conveyor C8. This coal shall be dischargedon to conveyorA2 or B2
as per the requirement and for onward transportation. The B2 Conveyor shall
be installed in parallel to A2 Conveyor and on similar conditions. The G9 washed
Coal discharged from B2 Conveyor on to 1400 MM wide tripper trolley
conveyor(B3) and unloaded into G/L Bunker.
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loose soil special care/design shall be taken care of.
The Conveyors A1,A2, B1 and B2 shall be covered with detachable
arrangements to avoid coal dust exposure.
Below eachslit one no. reclaim cum loading conveyorof 1600MM wide, 3.5 M/sec
speed, 3000TPH are to be installed. These conveyors (A4& B4) will carry the coal
discharged from plough feeders and finally load into the Pre-weigh wagon loading
systems of 600/90 cu.mtrs (4200TPH) capacity each.
The conveyor arrangement shall be such that both the conveyors ( A4&B4) can
able to discharge the coal into one Pre-Weigh wagon loading system or into
individual Wagon loading system at a time as per the requirement.
Suitable capacity Conveyor feeds – 200mm size coal into the 600 Cu.Mtrs. capacity
Surge Bunker. The system shall be designed to load the Wagon of capacity up to 72
Tonnes. The system shall have the capacity to load number of Wagons continuously,
provided the in feed conveyor fills sufficient quantity of coal in the Surge Hopper.
Surge bunker shall be designed for a capacity of 600 Cu.mtr. (about 480 Tonnes of
crushed ROM Coal). The Surge bunker shall have two outlets with one no. discharge
gate of suitable size for each outlet to discharge Coal into the Pre-Weigh Hopper.
The discharge gates of the Surge Hopper shall discharge a column of coal into the
72 Tonne capacity Weigh Hopper as per the pre-determined / programmed quantity.
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Cut-off discharge gate with a suitable swing / telescopic chute assembly for
discharging Coal into the Wagons.
The loading system shall be designed to operate by a suitable high speed hydraulic
system electronically by PLC, various sensors etc. for accurate loading of different
Wagons. A hydraulic power pack assembly with standby arrangement shall be
provided to operate all the related gates and the chute to have smooth, speedy and
consistent operation.
A microprocessor based PLC system shall be provided to control the weighing &
loading and to generate the reports.
1.2.5 WEIGHMENT
In addition to the above one numbers of 140T pit-less In-Motion Wagon Weigh
bridges shall be installed on main tracks for weighment of Rakes.
Fully automatic Coal sampling system to be installed in the CHP. Coal from
conveyor A4&B4 will be collected by the sampler at pre- determined intervals by
cutter type samplers to assess the quality of the coal being dispatched. The coal
samplers will be installed on the conveyors A4&B4 at suitable location.
The objective of this system is to control air pollution effectively . Adequate number
of nozzles will be installed at transfer points for suppression of dust by spraying
water in atomized condition. The dust suppression system shall be inter-locked with
the conveyor system so that it will be in operation only when conveyors are running
with coal on the belt. The dust suppression system shall be at Transfer points
Truck/Dump receipt hoppers, Semi ground bunker, Truck Loading points and on
Conveyors.
All transfer points and hoppers shall have wear resistant rubber/synthetic liners of
suitable specifications to reduce the noise and wear.
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C. FIRE FIGHTING SYSTEM
Install fire hydrant systems all along the Conveyors, Crushers and including Coal
stock yards at suitable spacing with suitable high pressure water supply pipelines,
hoses, hose boxes as per the standard practice. Suitable fire extinguishers will be
provided to deal with electrical/oil/ordinary fires at all the required points in the plant
like control room, sub-station buildings, office premises, drive houses etc.
Fire fighting system provided shall also be used for plant cleaning purpose also.
F. PREVENTIVE MAINTENANCE
For effective maintenance of all the equipment there will be sufficient working space
for each equipment/machinery. All the equipment, transfer points etc. shall be
covered and will have housing complete with handrail, ladder, cross over ladder etc.
as required. Electricalhoist shall be provided at Maintenance bays of Plough
Feeders and at A4/B4 discharge points.
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Two numbers of 5 MVA 33/3.3KV Power transformers are to be installed at 33 KV/
3.3KV Substation to meet the loads of the proposed Crushers, Conveyors and the
RLS system at Pre-Weigh Wagon loading system.The secondary neutral of the
transformers shall be earthed through neutral grounding resistor of suitable
capacitywith earth continuity monitoring Relay.
All the equipment’s, conveyors and the RLS system at Pre-Weigh Wagon loading
system will operate at 3.3 KV/550 V, 3 phases, 50 Hz supply system. Four numbers
of 3.3KV/550V substations are to be installed for feeding the loads of CHP &Pre-
Weigh Wagon loading systems
33 KV power will be tapped from the existing 33 KV substation by laying 500 mtrs
length of 33 KV OHT line to cater the loads and 33KV/3.3KV substation to be
established near the CHP. The 33KV line shall be erected on 14 meters height
towers to facilitate movement of Trucks/Dumpers.
For feeding power to 3.3 KV substation 1 & 2, two sets of double circuits of 3.3 KV
overhead lines with ACSR, WOLF conductors will be drawn. These lines will be
drawn from 33/ 3.3 KV substation up to the proposed 3.3KV substation-I and
terminated on a DP/4P structure. The second lines will be drawn from 33/3.3 KV
substation up to the proposed 3.3 KV substation-II and terminated on a DP/4P
structure.
The Over Headlines shall have pin type/disc type insulators, necessary cradle
guards for road crossing, stay rods, double poles as per requirement, eartling, sag &
clearances and other accessories conforming to relevant IS, IEE Rules.
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drawing which is enclosed in this document. However, the details have to be worked
out by the Bidder.
1.3.2.13.3 KV SUBSTATION - I
The 3.3 KV substation-I will be installed near the G9 Grade Feeder Breakers for
supplying power to the drives ofC1, C2, &C3 belt conveyors, 03 nos of 500 TPH
Feeder Breakers, Electromagnetic/Hydraullic brakes, Electromagnetic Separators,
Motorized flab gate, other misc. loads and lighting loads. The following will be
provided at this substation:
A.POWER TRANSFORMER
Three numbers of 3.3 KV /550V transformer (indoor type) of suitable capacity will be
provided along with required electrical in this substation to meet the requirements of
G9 Grade Feeder Breakers and corresponding Conveyors.
This lighting distribution board will be of 230V, 3ph type of required capacity. The
board will receive power from the secondary of the 50 KVA, 3.3kV/230V (L-L) lighting
transformer installed in this substation.
The 3.3 kV substation-II will be installed near the G12 Grade Feeder Breakers for
supplying power to the drives of C4,C5 &C6belt conveyors, 03 nos. of 500 TPH
Feeder Breakers and 03 nos. of Bunker door open/close Hydraulic power pack ,
Electromagnetic/hydraulic brakes, other misc. loads and lighting loads
A. POWER TRANSFORMER
Three numbers of 3.3 KV/550V transformer (indoor type) of suitable capacity will be
provided in this substation to meet the requirements of power to G12 grade Feeder
Breakers and corresponding Conveyors.
This lighting distribution board will be of 230V, 3 ph type of required capacity. The
board will receive power from the secondary of the 50 KVA, 3.3KV/230V (L-L)
lighting transformer installed in this substation to provide lighting surroundings of
G12 grade Feeder breakers .
1.3.2.33.3 KV SUBSTATION – 3
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The 3.3 KV substation-3 will be installed near the 60T Lorry unloading Bunkers for
supplying power to 04 nos. of 600 TPH Reciprocating Feeders , Electromagnetic
/Hydraulic brakes, Motorized flab gate, other misc. loads and lighting loads. The
following will be provided at this substation
A.POWER TRANSFORMER
One number of 3.3 KV /550V transformer (indoor type) of suitable capacity will be
provided along with required Electricals in this substation to meet the requirements
of 04 nos. of 600 TPH Reciprocating Feeders and other misc. loads.
This lighting distribution board will be of 230V, 3ph type of required capacity. The
board will receive power from the secondary of the 50 KVA, 3.3kV/230V (L-L) lighting
transformer installed in this substation to provide lighting surroundings of Lorry
unloading Bunkers and all along the Conveyors -A1,B1, A2 & B2.
1.3.2.43.3 KV SUBSTATION –4
The 3.3 kV substation -4 will be installed near Pre Weigh wagon loading supplying
power to the drives of belt conveyors A3/B3, 2 nos. of motorized hoistsat G/L
Bunkers& A4/B4 discharge drums, Electromagnetic/Hydraulic brakes, Wagon
loading system and other loads i.e Dust suppression, Dust extraction and Fire
fighting Systems and lighting loads.
A.POWER TRANSFORMER
One number 3.3 KV /550V transformer (indoor type) of suitable capacity will be
provided in this substation to meet the requirements of power to conveyors A3/B3,
Wagon loading system and other misc. loads.
This lighting distribution board will be of 230V, 3 ph type of required capacity. The
board will receive power from the secondary of the 50 KVA, 3.3KV/230V (L-L)
lighting transformer installed in this substation to illuminate around G/L Bunker,
Wagon loading system and all along gantries of Tipper trolley and Reclaiming
conveyors.
1.3.3 The capacity of all the transformer shall be selected based on the following:
i) The transformer shall be loaded 50%-60% of rated capacity
ii) The transformer shall be of preferred capacity as per Indian standards.
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iii) It shall meet the requirements of loads connected to it.
iv)The capacity shall commensurate with the starting requirement of the biggest
motor along with the other loads in operation.
The control scheme of the CHP and rapid loading system along with sequencing
shall be done through microprocessor based programmable logic controller (PLC)
suitable for industrial control system.
Supply voltage of 3.3KV shall be provided for all the motors of 110KW & above
andEquipment below 110 KW shall get power at 550V. However Feeder Breakers,
Plough Feedersand Reciprocating Feeders may have550V drives.
The power factor of the plant has to be improved to a level above 0.98 lagging at the
3300 volts switch board of substations. For this purpose 2 sets of capacitor banks
with manual control panel will be provided at 33KV substation considering the load
of the CHP & Pre-Weigh System
1.3.6 ILLUMINATION
1.3.6.1 The plant area indoor as well as outdoor shall be properly illuminated for
ease in operation, safety and security. The minimum illumination level and type of
luminaries required at various major locations shall be as given below:
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bunkers
05 Transfer houses, drive houses, 50 H Metal Halide/ HPSV lamps
Hopper complex, Floor of (70/150/ 250W) with flood
hoppers, various platforms in light fitting
silo and Sampler house, Wagon
loading area.
06 Substation outdoor yard, roads 20 H Metal Halide/ HPSV lamp
inside area and along the (150 /250 /400W) with street
conveyers Light/Flood light fitting
07 Lighting near truck/Dumper 40 H Lighting through 15 m/30m
receiving stations, outside high lighting mast Metal
bunker and SILO complex and Halide/ HPSV (400 W) flood
Feeder Breakers Area light fittings.
The Bidder shall calculate the number of luminaries required to achieve the above
illumination levels after considering the maintenance factor of 0.6, co-efficient of
utilisation factor depending on the area to be illuminated, internal/external areas etc.
The internal area of conveyor gantry, drive houses, Pre-weigh bin floors, substation,
control room, pump house, compressor room, Engineer’s room, testing room, stores
etc shall be determined by the bidder depending on the system requirements.
The actual external area to be illuminated shall be worked out by the bidder during
detail design and accordingly luminaries shall be provided.
Each Lighting transformer will be provided with a timer & contactor for automatic
control of switching.
1.3.7 CABLES
All the lighting Cables shall be of 3 core, 1.1KV grade, PVC SWA,Copper cable of
suitable capacity. The size of the cables shall be selected giving due consideration to
continuous rating, de-rating factor, voltage drop limit and short circuit with stand
capacity. However the minimum size of the cable from main to sub-distribution
board shall not be less than 16sq. mm and sub-distribution board to individual
circuits shall not be less than 10sq. mm.
B. Power Cables
All the cables used for connecting the transformers with 3.3 kV vacuum circuit
breakers, 3.3 kV VCP with HT motors, cables from isolators to circuit breakers will be
of 3.3 kV grade as per requirement. All other cables will be of 1100V grade. The HT
cable shall be PVC double layer armoured with copper conductor, suitable
sheathed, having FRLS properties in outer sheathing and the LT cable shall be with
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single wire armouring, PVC insulated and PVC sheathed copper conductors of
stranded wires with FRLS properties in outer sheathing.
The size of the cables shall be selected giving due consideration to continuous
rating, derating factor, voltage drop limit, short circuit withstand capacity etc. In the
conveyor gantries power cables will be installed in the walkway side on cable
hangers/cable trays. In the other houses these cables shall be provided on separate
hangers/trays fitted to the walls or structural members. In the substation these will
be laid on cable hangers provided in the cable trenches/ cable vaults. In the other
places these will be laid in cable trenches as per standard practice. Route indicators
will be provided for identification of the route. Hume pipes are to be provided in case
of road crossing. Power cable of different voltage grades, control cable &signaling
cable shall run separately in the cable tray.
Cable Trenches/Trays are to be provided complying with the relevant IE Rules &
Code of Practices amended up to date.
Emergency lights will be provided in control rooms and substation buildings suitable
for operation through invertors. For feeding power to these emergency lights an
automatic battery charger-cum-inverter device along with suitable AH capacity
battery to run for at least 3 hours will be provided. These lights will be starts
automatically in case of any power failure. The emergency lights shall be suitable
type to meet the site conditions. For this separate wiring will be done along with the
provision of separate luminaries.
Proper earthing arrangement for the plant has to be provided as per I.E Rules.
Additional earthing grid shall have to be developed around the periphery of 33 KV
substation and 3.3 KV substation/ switch station. The earth grid shall be formed by
interconnecting GI strip of size not less than 65 mm x 5 mm.
Each motor, transformer, switch panel and other electrical equipment should be
earthed by two separate earthing strips. In addition all the motors will be earthed
through the armouring of the connecting cable. All the poles of the Lightning
Arrestors, body and neutral of the transformers shall be earthed separately. Size of
earthing strip and electrodes shall be as requirement, as per relevant IS, to be
finalized by the bidder during detailed engineering stage. However, the size of main
earth bus strip shall not be less than 65 mm x 5 mm where as that of the connecting
earthing strip shall not be less than 25 mm x 5 mm.
Adequate care shall be taken towards earthing of light fittings, welding sockets etc.
G.I. strips will run along the conveyor for earthing of light fittings, junction boxes,
control switches (pull chord switches, belt sway switches etc.)
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As JVR OC CHP is a lightning prone area, proper lightning protection shall be
provided as per IS 2309 (latest amendment).
In order to protect the substation building, drive stations of belt conveyors OH bunker
and silo buildings. etc. from direct lightning strokes a proper lightning protection
system as per relevant Indian standards shall be provided. For this purpose required
numbers of spikes/interceptors of at least 2m height will be provided on the roof tops
of the above buildings and drive houses. The spikes/interceptors provided on each
building and will be interconnected by means of suitable size G.I. flats supported on
saddles to form a grid.
The value of earth resistance shall not exceed one ohm in all the time throughout the
year. Earth pits/ Earth electrodes shall be located near 33 kV substation and 3.3 kV
substation, Ground bunker, Silos, transfer houses, hopper house, intermittent points
along conveyor gantries etc.
550V, 3 Ph 4 pins industrial type dust proof plug interlocked power plug & socket
with switch shall be provided. Welding receptacles shall be connected with each
other in loop-in loop-out connection (to the extent of 5 nos. max.) located at an
interval of 50 m along the conveyor and both side of ground bunker and minimum
one no shall be provided in all equipment, floor of Transfer Points, drive houses, floor
of hoppers, silo floors, substation/switch stations etc. The sockets receive power
from 3.3KV substations through PVCSWA cables of 1100 V grade, 3 core Copper
conductors of suitable size.
The auto control of CHP operations i.e. auto remote, auto sequence of interlock, de-
interlock, local/manual, local/central, signaling, data logging, data display, etc. to be
achieved by dual redundant PLC .
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The equipment in coal flow line in each section shall be started automatically in
sequence in the reverse of coal flow. Similarly, the stopping shall also be in
sequence and in the same direction as of coal flow. However, the sequence of
starting and stopping of Drive system shall be predetermined time lag.
The concept of control of CHP through PLC is briefly given below to facilitate
preparation of suitable control system by the tenderer. The bidder has to supply
comprehensive scheme incorporating all the features with latest technology.
The control scheme of the entire plant shall be done through microprocessor based
programmable logic controller (PLC) suitable for industrial control system. The PLC
shall provide the facilities for interlocking, sequence control, process control, data
logging, data display and printing, supervisory control etc. All the PLCs should be
provided with UPS.
The control room shall be provided with control desk for individual stream with
continuous laminated colour graphic dynamic mimic, VDU screen and annunciation
panel with all facilities. PCs for operation and Engineering shall be provided and
located in the control room.
The mimic of the storage & reclamation section at the control room shall show the
status of PWWL and mimic of wagon loading at PWB control Room.At control room
shall also show the status of Plough feeders,reclaim conveyors and quantity of coal
in the Surge hopper.
Start of all the connected equipment from the respective control desk in sequence in
case of failure of auto sequence control.
The conveyors and equipment should be able to trip on occurrence of the following
conditions:
1. Under speed (for conveyors only)
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2. Belt sway operated with the arrangement to bypass belt sway switches at the
time of the starting of the plant and also during normal running if found
necessary (for conveyors only)
3. Pull chord switch operated (for conveyors only)
4. Single phasing of the power supply
5. Motor winding and bearing overheating (HT motors only)
6. Operation of safety and protection device
7. Motor overload
8. Any other fault if found necessary during detailed engineering stage by the
Customer
Provision shall be made for audio-visual fault annunciation system for following.
i). Pull chord switch operation
ii). Belt sway switching operation
iii).Winding/bearing temperature high for HT motors
iv).Emergency stop operation
iv).Any other item as found necessary during detailed engineering stage by the
customer/consultant.
Prior to starting of the plant, a provision of inspection shall be there to take care of
the stage of readiness of the entire plant. All the focal points shall be provided with
audio-visual signaling arrangement for communicating the permission to start.
Pre-start hooters shall be provided at strategic locations i.e near drive units, tail end
and discharge end etc.
1.4.5 COMMUNICATION
The following communication system shall be installed in the coal handling plant.
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Required nos. of automatic dial type telephone sets shall be provided at various
locations in the Coal Handling Plant as stated below:
i). Dumper receiving hopper Complex - 6 Nos.
ii). Office - 4 nos.
iii). Bunker - 2 nos.
iv). Substation (one each at 33kV, 3.3KV S/S 1,2,3 &4 ) - 5nos.
v). Central control room - 1 no.
vi). Pre-Weigh bin control room - 2 Nos.
These telephone sets shall be wired and brought to a common junction box in the
plant. Then this will be connected to the auto exchange to make it an integrated
communication system.
Split type air conditioners of suitable capacities should be provided at Central and
Pre-weigh bin Control room. PLC rooms. Engineer-in-charge’s room shall also be
provided with Split type air conditioners of adequate capacity.
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g. Power, Lighting and Control Cabling.
h. Control Desk cum mimic panel and annunciation Panel for control of
equipment of Rapid Loading Complex, Loading Conveyors and other
miscellaneous Electrical drives.
i. Control, automation, interlocks, Signaling and instrumentation of Rapid
Loading complex including sequence operation of loading conveyors with
PWWL level indicator and dove-tailing of sequence operation of Reclaim
Conveyors with plough feeders below ground bunker.
j. The rating of equipment indicated in the drawings are minimum and bidders
are required to assess the rating of equipment as per system requirement and
quote accordingly.
j. Provision of inverter base emergency lighting in substations and control
rooms in case of failure of power.
k. Transformer capacity mentioned in the drawing is minimum capacity. Bidders
shall make their own assessment and shall indicate higher capacity, if
required. All the transformers including that of lighting shall be located indoor
only
l. All the electrical installations shall be as per Indian Electricity Rules and
DGMS Regulations. Approval of DGMS shall be obtained by the Bidder along
with submission of necessary Test certificates/drawings/circuit diagrams
1.7 TRAINING
The plant personnel responsible for operation & maintenance of the plant and
deputed by employer shall be properly trained whether in land or overseas, so that
the persons are fully conversant with the assembly and sub-assembly of the
equipment, detail circuit of the electrical control system including, hydraulic system &
operation and maintenance etc. The plant personnel shall be in a position to rectify
any defects of the equipment developed during operation of the plant for efficient
running with minimum down time.
To eliminate delays and avoid disputes and litigation it is agreed between the parties
to the contract that all matters and questions shall be referred to the engineer and
his decision shall be final. The work shall be performed under the direction and
supervision of the engineer.
The scope of the duties of the engineer, pursuant to the contract, will include but not
be limited to the following :
a. interpretation of all the terms and conditions of these documents and specification.
b. review and interpretation of all the Bidder’s drawings, engineering data etc.
c.witness or authorise his representative to witness tests and trials either at the
manufacturer’s works or at site, or at any place where work is performed under
the contract.
d. inspect, accept or reject any equipment, material and work under the contract.
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e. issue certificate of acceptance and/or progressive payment and final payment
certificates.
f. review and suggest modifications and improvements in completion schedules from
time to time.
g. supervise the quality assurance programme implementation at all stages of the
works.
h. to receive and endorse the despatch documents enabling the Bidder to clear the
consignments.
1.9TEST RUN
1.9.1 Start up
a) On completion of erection of the equipment and before start-up, each item of
the equipment shall be thoroughly cleaned and then inspected jointly by the
Engineer and the Bidder for correctness and completeness of installation
and acceptability of start-up , leading to initial pre-commissioning tests at
site. The list of pre-commissioning tests to be performed shall be as
mutually agreed and included in the Bidder’s quality assurance programme.
b) The Bidder’s commissioning/start-up. Engineers specifically identified as far
as possible shall be responsible for carrying out all the pre-commissioning
tests. On completion of inspection, checking and after the pre-
commissioning tests are satisfactorily over, the complete equipment shall be
placed on initial operation during which period the complete equipment shall
be operated integral with sub-systems and supporting equipment as a
complete plant referred hereinafter as plant.
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d) A trial operation report comprising of observations and recordings of various
parameters to be measured in respect of the above trial operation shall be
prepared by the Bidder. This report, besides recording the details of the
various observations during trial run, shall also include the dates of start and
finish of the trial operations and shall be signed by the representatives of
both the parties. The report shall have sheets, recording all the details of
interruptions occurred, adjustments made and any minor repairs done during
the trial operation. Based on the observations, necessary
modifications/repairs to the plant shall be carried out by the Bidder to the full
satisfaction of the engineer to enable the later to accord permission to carry
out performance and guarantee tests on the plant. However, minor defects
which do not endanger the safe operation of the equipment, shall not be
considered as reasons for withholding the aforesaid permission.
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f) The specific tests to be conducted on equipment has been brought out in the
technical specifications.
g) Performance and guarantee test shall make allowance for instrumentation
errors as may be decided by the engineer-in-charge.
1.11 TEST CODES : The provisions outlined in the ASME performance test codes or
other international and Indian approved equivalents shall generally be used as a
guide for all the above test procedures unless otherwise specified in the technical
specifications.
The tenderer shall guarantee that the system offered will able to operate round the
clock all-round and the guarantee that the system shall achieve minimum 90%
availability during the initial period of 12 months from the date of issue of final
acceptance test. In the event of system not being able to reach availability of 90%
the penalty equivalent to 1% of the contract value for fall of 2% availability will be
recovered by SCCL for maximum of 10% penalty.
The formula for availability shall be as below:
The Bidder shall warrant that all the equipment will be new and in accordance
with the contract documents and free from defective material, workmanship and
shall guarantee trouble free operation of the entire system for a period of 12
calendar months from the date of acceptance test.
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2.0 CIVIL CONSTRUCTION
The civil and structural works are related mainly to the following areas (but not
limited to):
a) Pre-Weigh Wagon loading systems 600/90 Cu.mtrcapacity with staircase,
control room-2 nos.
b) 21000 T surface ground level bunker with partition
c) Dumper Receipt Hoppers 120 T capacity-06 nos.
d) Lorry receiving Bunkers 100T Capacity-03 nos.
e) Truck unloading Bunkers 60T Capacity -04 nos
f) Transfer Houses
g) Drive Houses
h) Conveyor Gantries & Trestles
i) CHP office along with Time office,
j) Security post,
k) Rest shelter,
l) Cycle, Scooter &Car parking shed,
m) Toilet and Canteen
n) First aid Room
o) Service buildings like 5 nos. of Sub stations,
p) Central Control room,
q) Store shed etc.
r) Water storage tank
s) Roads to approach all Transfer houses, drive houses, service buildings,
control rooms, CHP office etc.
t) Proper drainage for entire system
u) Industrial and drinking water arrangement.
v) Internal Street lighting along the approach Roads.
w) Any other item not mentioned but required for successful completion of the
Project.
2.1 GENERAL
This is a pre-engineered EPC assignment for design, supply, erection,
commissioning, trial run and handing over of all the equipment and other sub-
systems of the proposed coal transportation and Pre-weigh wagon loading
arrangement at JVR OCP, Sathupalli, KGM Area of SCCL as elaborated in
subsequent Para in this chapter.
The contract for the package will not be split. The contract will be treated as a
combined contract.
The equipment and works mentioned hereinafter to be read in conjunction with
preamble, system description and basic data sheet and technical specification which
are indicative and not limited to the description and/or list given.
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All mechanical & electrical equipment and systems and civil works are within the
scope of supply and works of Bidder.
2.2.1. The Scope of Work under this tender shall include design, construction,
supply of equipment including transportation to site, all mechanical,
electrical, civil and structural works, erection of equipment and structures,
carrying out detailed survey and supply of drawing, drawing showing
contours, supply of detailed design, working manuals, working drawings
including all relevant calculations, testing and commissioning, elimination of
all teething troubles, carrying out all performance tests and handing over of
the plant as envisaged in detailed scope of work and system description.
Due consideration shall be given for economy, architecture and functional
utilities. This being a turn-key work, all works needed for successful
completion and operation of the plant together with the associated systems
shall be covered in the scope of work, whether specifically mentioned here
or not.
2.2.2 All the works including designs, drawings, construction, fabrication, testing,
erection, etc. shall be done strictly as per IS Code of Practices. Wherever
no Indian Standard are available, British, American, German, or any other
International standards may be used on prior approval from the
Purchaser/SCCL.
2.2.3 The jobs to be carried out are broadly classified into three categories. These
are Civil & Structural, Mechanical, and Electrical. However, the jobs are to
be carried out on turnkey basis by carrying out interface works also.
The bidder shall be required to complete the following works to the complete
satisfaction of customer (SCCL).
23
f. Conducting tests prescribed in the relevant acts, rules, regulations, codes of
practices of Indian Standard and as necessitated by generally adopted sound
engineering practices during erection and commissioning shall be followed.
g. Rectification of problems detected during testing, erection and commissioning
by making necessary changes in the design and / or installation and supply of
equipment, accessories and material.
h. Addition and or alteration as found necessary during tests, erection and
commissioning to achieve the objective.
i. If any other work not specifically mentioned but are required to be done to
complete the plant shall be deemed to be included in the scope of work.
j. Obtaining approvals from Weights and Measure Department/Railways is the
responsibility of the bidder.
k. The technical parameters to be furnished are subject to scrutiny/approval at
the detailed design stage which may undergo minor changes keeping in view
the system requirement and various codes of practices/regulation by the
statutory bodies. This is also true for drawings. The parameters not
specifically mentioned in the bid document shall be decided at the time of
detailed engineering subject to SCCL’s approval.
A. DESIGN ENGINEERING
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ix. Provision of equipment (Motorised belt reeling drum) for belt
erection/replacement and vulcanising during maintenance of conveyor belt
shall be made available at site by the bidder.
i. Erection & Commissioning of tail end frame with drum, external cleaner,
skirt board, intermediate structures, take-up, drive head including motor,
gear box &couplings, discharge drum, conveyor rollers, single / two way
discharge chute for conveyors, safety switches and laying of suitable
belting and vulcanising of conveyors .
ii. Erection & commissioning of 500 TPH Feeder Breakers (-) 200mm, Rapid
loading system, In-Motion Wagon Weigh Bridge, magnetic separator, chain
pulley block, electric hoist, fire fighting system along with associated
accessories and condition monitoring equipment, Erection and
Commissioning of dust extraction, dust suppression and ventilation
equipment at different locations wherever required.
iii. Construction of 21000T (8000T+5000T+8000T) surface ground bunker of
slit type for installation of plough feeder and tripper conveyors.
iv. All Transfer points
v. 600/90 cum PWWL System with pre weigh-hopper consisting of hydraulic
power pack, cylinders, guillotine etype gates for high speed load out, arch
breakers, load cells, wagon loading swing type/telescopic chute and
temperature sensors.
vi. Rapid loading system-The loading will be done through rapid loading
system on an average one wagon per minute. The loading shall be
controlled from control room located at first floor of the PWWL System. The
rate of loading will be around 3600 TPH matching the creep speed of
locomotive. The rakes will be hauled by a creep controlled locomotive at
0.8 to1.2 km/hr. Ultrasonic level indicators will be provided in the Surge
hopper to show the coal level position. Air blasters shall be provided to
avoid /break the arch formation inside the silo and to ensure smooth coal
flow through the silo. The system shall have the switches for emergency
stop of feed conveyors in case of over filling of silo. There shall be
temperature sensors to indicate the abnormal temperature inside the Surge
hopper and provide caution so that firefighting measures can be taken up.
To ensure better loading and weighing accuracy pre-weigh loading system
shall be adopted. In addition 01 no. of 140T in motion rail weighbridge for
wagon weighing system is required separately. Provision of two PWWL
Systems are to be provided as indicated in the drawings.
vii. Sampling system-For determining the quality of coal dispatched by each
rake there shall be provision of automatic sampling of coal, cutter type,
from the feed conveyors to the Surge hopper at suitable location. The
sampling system shall conform to BIS/ISO/ASTM specifications and shall
consist of a primary sampler fitted to each in feed conveyor and a primary
sample belt conveyor of min 650mm width to collect coal samples from the
two separate sample discharge chutes and to convey the primary sampled
coal to the sample preparation system.
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C. MISCELLANEOUS SYSTEMS
I. SAFETY DEVICES
All the equipment and conveyors in the circuit shall be provided with necessary
safety devices such as emergency stop switches, overload protection, wire-netting,
railing or guards, pull chords switches, belt sway switches, zero speed switches,
brakes thrusters, holdback devices, etc wherever applicable. All equipment
in both the streams will be started and stopped separately from the central control
room in a pre-determined sequence consecutively i.e. one by one with a definite time
lag. The sequence of starting of drive will be in the reverse direction of coal flow,
whiles topping of the drives will be in the direction of coal flow. In case of stoppage of
any equipment in the circuit for any reason, all the preceding equipment/conveyors
shall be stopped automatically. Pre-start hooters shall be blown to alarm the
operating and maintenance personnel. All the floors and distant transfer houses shall
be provided with audio-visual signals to alarm the working personnel locally.
Necessary walkways and crossovers shall be provided along the conveyors. Under-
netting shall be provided wherever conveyors cross any roads or working areas as
elaborated elsewhere.
Proper water supply arrangement for dust suppression and dust extraction will be
made at dust generating points so that all working space remains free of dust. For
dust suppression water jets will have to be provided in receiving pit area, silo loading
point, transfer houses and dust extraction arrangements will be done at bunker
location. Alternatively, fog type dust suppression can also be used at critical location.
For proper ventilation in all the working floors, arrangements for installing exhaust
fans/ventilation fans with ducting will have to be made as detailed elsewhere in the
tender document. All civil works pertaining to dust suppression and extraction shall
be as per system requirement. The pumping sets for the dust suppression/ control
should have100% stand-by. Necessary arrangements of infrastructure for
reusing/recycling of used water should be made. Necessary measures shall also be
taken for noise and vibration control.
Chutes shall be designed for a smooth flow of coal and they shall be lined with
suitable replaceable polyurethane liners.. Conveyor chutes shall be carefully
designed with respect to the coal trajectory to minimize impingement and wear on
lining plates
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IV. PLANT CLEANING AND DRAINAGE
Suitable arrangements shall be made for cleaning of plant especially at the spillage
point with the help of water hydrants and vacuum cleaners in case of electrical
panels and plant equipment. Plant cleaning points shall be provided at each
receiving pit complex, drive house, tail end, transfer points, semi ground bunker and
along all conveyors at a maximum interval of 50 metres.Proper drainage
arrangement will have to be made all along the plant so that water or slush
accumulation is avoided. At every probable spillage point suitable arrangement will
have to be made for mechanized or manual cleaning.
Fire fighting system shall comprise of fire/heat/smoke detection, fire alarm system
and fire fighting system both water and aerosol reliant. There shall be a Control unit
to monitor fire fighting activities near the bunker at Substation . Fire fighting system
shall be designed to meet the various requirements laid down in the fire protection
manual by the Tariff Advisory Committee (TAC), India and National Fire Alarm Code
by NFPA (USA).
A. HYDRANT SYSTEM:
The fire hydrant system shall be designed considering the entire plant generally as
ordinary hazard as per TAC manual and shall consists of a net work of over ground
piping feeding pressurised water to a number of double headed hydrant valves
located throughout the entire coal handling plant.
Portable extinguishers of carbon dioxide type, dry powder type & soda acid/ DCP
type shall be installed at suitable locations all along the plant as per TAC manual.
Mobile extinguishers of required number shall be provided. Different types, as
described above, shall conform to the latest BIS standards.
C. VENTILATION
Proper ventilation system shall be provided at suitable locations as per requirement.
A site office of suitable size for Engineers/Supervisors and a rest room for workers
shall be provided. Other service buildings shall be provided as detailed elsewhere
and/or, as per requirement.
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2.5 ELECTRICAL
Earthing and Lightning Protection System (travelling waves and direct stroke
lightning) of the entire CHP, substations, SILOs etc.
For designing the earthing system the Bidder shall carry out tests at his own cost to
determine the soil resistivity from a reputed firm acceptable to the company.
a). Erection of 33KV and 3.3KV substations including civil and foundation work,
erection and commissioning of required nos. of bays including GI structures,
insulators and other accessories as per requirement.
b) Proper roads are to be provided within the switchyard to facilitate the transporting
of Equipment to their respective site.
c) Soak pits are to be provided for all the Power transformers.
d) Proper drainage system of the leakage transformer oil up to the soak pit should
be provided.
e) Baffle wall should be provided between two Power transformers.
f) Full proof drainage system should be established to protect the Electrical
Equipment from submerging.
g) Switching yard should be covered with gravels as per requirement.
h) The 33KV switchyard should be fenced and properly earthed. However, the total
compound (including switchyard and control room) should be covered within the
existing boundary wall.
i) Cable tray & cable trench are to be constructed as per requirement.
j) After preparation of substation drawings, approval should be taken from the
competent authority.
2.5.1 During construction of the CHP, following points are to be taken care of
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f. Air Conditioning System for Engineer-in-charge room, central control room,
PWWL control rooms etc.
g. Proper ventilation for the Switchgear room of all the 3.3 KV substations
h. Selection and provision of exhaust fans and ceiling fans in all the buildings
wherever necessary.
i. Preparation of installation drawing in accordance with approved design. Final
approval shall be given by the Customer.
j. All other Electrical/Civil/Mechanical works not mentioned here but required to
be done as per system requirement for commissioning of the whole plant will
be deemed to be included.
k. The ratings shown in drawings are only indicative and for tendering purposes
only. The Bidder however shall give detail drawings, ratings specifications of
every item.
2.6.1 GENERAL
The scope of work under this contract shall include design, construction and
successfully commissioning of all civil and structural works including supply of
detailed survey drawing showing contour, geo-technical investigation, supply of geo-
technical report, supply of detailed design, working drawings including all relevant
calculations and all necessary works as may be needed for testing and
commissioning, elimination of all teething trouble, performance test and handing over
of the plant as envisaged in detailed scope of work and system description. The
necessary construction, erection, commissioning equipment related to civil
engineering works shall be provided and transported to the site of work by the
Bidder. Due consideration shall be given for economy, architecture and functional
utilities. This is a contract for complete installation including planning and design,
supply, execution and erection of civil & structural work. Accordingly, all works
needed for successful completion and operation of the plant shall be covered in the
scope of work whether specifically mentioned here or not.
All the works including designs, drawings, construction, fabrication, testing, erection,
etc. shall be done strictly as per relevant BIS Code of Practices, wherever no Indian
Standard is available, British, American or other international standards may be used
only as per its applicability and justification.
The scope of work covers all the related civil and structural works, detail designing of
the same and successfully commissioning of the civil and structural works for
handing over the plant. This shall inter alia, include the following:
29
Design & engineering of all civil and structural works of the plant.
Execution of all civil/structural works consisting of the following:
Perception and remedial measures for the safety of entire CHP area under the scope
keeping in view the adjoining natural and artificial features such as hill slopes, nallah,
buildings, etc.
Any other works/services not mentioned but required for the completion and
commissioning of the plant. .
2.6.3 DESIGN/ENGINEERING
All detailed design and working drawings will be developed with proper coordination
and inter-relation with mechanical and electrical equipment. The design of RCC
structure shall be carried out in general as per code of practice of plain and
reinforced concrete for general buildings construction BIS 456-2000 and other
relevant standards including up-to-date amendments. The steel structure shall be
designed and fabricated as per Code of practice for use of structural steel in general
30
building construction BIS800 (latest edition) with up to date amendments and other
relevant IS standards. The building/structure shall conform to local by-laws, rules
and regulations for industrial buildings and as per relevant Indian Standards. Latest
codes of practice with amendments up to date shall be strictly followed. In the
absence of BIS codes, British standards Institution or the approved international
bodies’ codes could be considered for design as per its applicability and justification.
The bidder shall be responsible for and shall pay for any alterations of the work due
to any discrepancies, errors or omissions in the design and drawings or other
particulars supplied by him, whether such design, drawings or other particulars have
been approved by customer or not.
All RCC and steel structure shall be designed in accordance with relevant IS Codes
of practice of latest revision. In the analysis of structures, the worst loading
combination of belt pulls, equipment loads, their impact, wind/seismic loads/blasting
effect, coal and other loads as envisaged shall be considered.
Broadly all the dimensions as given in the tender document drawings are to be
followed for biding purpose. These dimensions are indicative & may require changes
during detail design.
2.6.3.5 PREPARATION
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All the drawings shall be prepared in accordance with the provision of latest Indian
Standards. All drawings shall be sufficiently detailed and dimensioned to help in
speedy construction, fabrication and erection of structures. Wherever, any structure
is presented in more than one sheet of drawings, same scale and notations shall be
used in all the sheets for linking the drawings with each other. All modifications made
in structure during various stages of construction should be duly incorporated in
working drawings .Bar bending schedule, detailed material list and specification of
works shall be prepared / detailed. Working drawing shall also include general
arrangement drawings showing plans at different levels with sectional elevations.
Separate detailed drawing shall be prepared for inserts and anchor bolts including
their fixing details. The design drawings associated with steel structure should show
the force in the members, complete details of all members, joints, gusset plates,
welding, riveting, bolting, etc. The drawings should also show the weight of each
assembly/sub-assembly as far as possible. In addition to design drawings,
fabrication drawings shall also to be prepared, showing item wise details, erection
units, materials list, details of fasteners with assembly, etc.
The tenderer shall submit Geo-technical report, all the relevant detail design
calculations, general arrangement/detail drawings, bar bending schedule, detailed
material lists, specification of works including contour plan for approval of SCCL /
consultant on standard size sheet. Scrutiny and approval of drawings may be carried
out through the consultant engaged by SCCL. All design details and drawings shall
be submitted for approval of the following: • General Arrangement Drawings • Detail
design calculations • All detail civil/structural/fabrication drawings • Any other
drawings relevant for execution/fabrication of civil/structural works Bidder shall
submit for approval six sets of drawings along with detailed design calculations
including analysis of force/stress in the structure along witht he source from where
data, except BIS codes, have been taken. Photocopies of such data should be
submitted along with the design. Along with the six sets of hard copies a soft copy in
CD in autoc ad format shall also to be furnished.
The SCCL shall have the final say in the approval of drawings. Drawings so
submitted will become the property of the SCCL. The approval of the drawings does
not absolve the Bidder from the overall responsibility of the plant for its successful
operation. The Bidder shall be responsible for and shall pay for any alterations of the
work due to any discrepancy, errors or omissions in the drawings or particulars
supplied by him, whether SCCL has approved such drawings or other particulars.
Approval by SCCL / Consultant Design & drawing, submitted by the Bidder, shall be
scrutinized by SCCL. Out of six sets of drawing submitted to the Bidder
32
approval as the case may be. The Bidder shall carry out the necessary rectification
in drawings after discussion with SCCL in a reasonable time as agreed upon
mutually and resubmit six copies of such revised drawings for approval of SCCL.
Revised drawings shall then be scrutinized and approved if the comments made by
the SCCL are incorporated / taken care of. One copy of such drawing will be sent to
the Bidder after approval.
Bidder shall make necessary correction / modification in the drawing as per actual
work and shall prepare as built drawing. The Bidder shall supply such8 (eight) sets of
prints of as built drawing to the SCCL along with one set of reproducible drawings in
AutoCAD format. The same will hold good for other documents also to be supplied
by the Bidder under the heading of basic scope. All drawings should be prepared on
AutoCAD in standard format and CD containing such drawing shall also be supplied
along with hard prints.
The civil and structural works are related mainly to the following areas (but not
limited to):
33
B. SERVICE BUILDINGS
a. Service building such as main CHP office, rest room, First aid centre, canteen
etc. with provision of separate room for each executive and supervisor
b. One no. Store near main CHP office Plinth area
c. One no. security post/ time office near main CHP office Plinth area
d. Light vehicle parking shed for 6 Nos. of vehicles near main CHP office Plinth
area
e. Shed for 50 cycle Motors
f. Common toilet Plinth area
g. Five (5) Nos. of Electrical sub-stations(33KV and 3.3 KV)
h. Workshop Building with Rooms
a. Road - As required
b. Pavement area - As required
c. Boundary wall - As required
34
2.7.4.2 SAMPLER HOUSE
At ground level, railway track shall be provided below the PWWL system for loading
through RLS for which a rigid pavement suitable for ballast less track as per norms
of RITES, Indian Railways, shall be provided. Proper drainage system shall be
provided around the wagon loading system to prevent stagnation of water during
peak precipitation. Extent of pavement for railway track below the silo shall be as per
manufacturer’s recommendations but not less than 50m on either side of centre line
of wagon loading system. However, laying of track is not in the scope of the bidder.
35
maintenance, hoist, monorails, etc. shall be provided as per system requirement. All
the necessary inserts shall have to be provided for fixing cables, supporting
structures for conveyors, etc. The shelves for plough feeders shall be extended upto
a minimum distance of 5 m at both ends from vertical wall of the ground bunkerfor
maintenance purpose. Bunker floors shall be of RCC. The floor shall be provided
with suitable slope along and across the conveyor for proper drainage. Road shall
be provided around the ground bunker as per system requirement.
Provision have been made for two machinery wells of suitable size on the both the
ends of the ground bunker. The floor of the wells shall be same as of the bunker
floors. Roof and wall of the machinery well shall be designed and constructed as per
system requirement. Arrangements should be made for providing 5T capacity
Electric hoists . Monorail facilities should also be provided so that equipment can be
lifted/ repaired and loaded in trucks. Stairs of minimum 1.2 meter width shall be
provided in both the wells. Necessary doors with shutters and windows shall be
provided as per requirement.
Truck receiving hoppers (over ground type) of RCC construction shall be provided. It
shall consist of four numbers of truck unloading facility in series are to be provided.
The total capacity of the hoppers shall be 4X60T=240T. The hopper should be of
RCC having walls of suitable slope to facilitate smooth flow of coal to the openings.
Ironite/ ferrosite liners are to be provided suitably. There shall be no unevenness in
the slope of the hopper. A platform of suitable area (minimum 30 m )all around the
hopper for plying the huge number of trucks/ dumpers at the loading platform and
ramp of suitable gradient shall be provided. The ramp for approach up to truck
receiving platform should not be steeper than 1 in 16. The surface of the platform
shall be suitable to sustain the movement of trucks/ dumpers. Proper care is to be
taken to protect the pavement area and ramp from soil erosion and settlement as it is
on filled up soil. The hoppers will be covered by a shed to prevent entry of rain
water. A steel fabricated maintenance platform is to be provided for the
Reciprocating feeders placed underneath the outlet pockets.
36
the filled up ground, if any, along the alignment of conveyor, is also included
in the scope of this work. Before start of actual construction over earth/ OB
filling, (If any) assessment of soil condition and all steps for its improvement
as per design requirement are included in the scope of this work. The
foundations shall be designed in such a way that there is no appreciable
settlement in due course of time. Rectification of any subsequent settlement
during entire contract period is covered under the scope of this work. Proper
drainage arrangement for storm water all along the conveyor alignment,
considering the adjoining catchment area shall be provided. No intermediate
support shall be provided inside the conveyor gallery. The bidder may visit the
site to have first-hand information about ground profile and other necessary
details before bidding.
C. OVERHEAD CONVEYORS
37
trestle for overhead conveyor gallery shall be suitably spaced. Adequate
clearance and safety arrangement should be provided for trestles nearby
railway line, roads and other infrastructures. Additional guide plate shall be
provided to protect the trestle from any damage if required
The drive house and transfer house shall be of structural steel construction and shall
be provided with monorails, with hoist block / chain pulley block for material handling
purposes. The drive arrangement should be kept near to the Transfer House as far
as possible. Drive houses and take up arrangement of suitable size are included in
the scope of the Contract. The roof covering and side sheeting of the structure shall
be provided with pre coated galvanized/corrugated iron profile sheet. 12% of roof
and 8% of side cladding area shall be provided with translucent sheets..Dusts down
comers are to be provided in all floors. Openings for electric cable entry are to be
provided on all the floors suitably. Different floors of the transfer houses shall be
made with minimum 6 mm thick chequered plate. The ground floor of the transfer
house and drive house shall be at least 450 mm above the final accepted ground
level and shall have concrete floor with ironite flooring on top. This floor shall be
extended 1.5M all around beyond the transfer house. All the intermediate floors shall
be of structural steel.
One number 33KV and four numbers 3.3KV sub-station namely 1,2,3, and 4shall
be of RCC framed structure, plastered and finished with acrylic based smooth
exterior paint from outside. Inside painting shall be done with plastic emulsion paint.
The location of substations has been shown in the system drawing. The substation
1,2,&3 will be a single storey building whereas the substation 4 which also have a
control room for the plant shall be a double storied building. Each3.3kV substations
shall have the minimum plinth area of 450 sq.m. which may change during detail
engineering as per equipment requirement. Necessary clearance shall be provided
along all the equipment installed in the substations as per the norms. The
Substations will have transformer rooms, MCC rooms, tool room, capacitor bank
room, control room, etc. The floor of the building will be vitrified or other type,
depending upon specific functional/safety requirement. The layout of the cable
trench/ cable vault will be as per system requirement. The invert level of the cable
trench shall be kept minimum 0.5 m above finished ground levels and the plinth of
the building shall be fixed accordingly. The building shall be provided with RCC roof.
There will be suitable arrangement for lifting the transformer in case of
breakdown/maintenance for which suitable RCC platform shall be constructed at
same level outside the substation building to facilitate handling of the transformer
and other equipment. The scope covers construction of complete building with cable
trench and foundation of the equipment in all respect..
38
The 33/3.3 kV substation for the proposed CHP shall be constructed near to the
CHP. Construction of substation building and yard for CHP is in the scope of this
work.
All the buildings except otherwise mentioned below shall be of RCC framed
structure, plastered and finished with acrylic based smooth exterior paint from
outside. Inside painting shall be done with plastic emulsion paint. However, lighting
towers, light vehicle parking, scooter / bi-cycle sheds may be of structural steel. The
area for the various service buildings to be provided has been given earlier. Plinth
level of service buildings shall be sufficient around the buildings. Flush doors, rolling
shutters, collapsible gates and steel grill, aluminimum windows etc. are to be fitted
as per requirement. All the buildings shall be given pre-construction anti-termite
treatment. The floor shall be of vitrified type/ any other type depending on specific
functional requirement. The store floors shall be of RCC with ironite topping. The
floor of the battery room shall be anti-acidic. The battery room should be provided
with exhaust fan to exhaust the fumes.
a. CHP OFFICE The main office shall be situated near the 33 KV substation as
located in the plan. Besides Officers’ room, the CHP Office shall include a
rest room, a first aid facility and a canteen. The CHP Office shall be a single
storied building and have cycle / scooter shed and car parking shed for the
required operational/maintenance manpower of the CHP. A separate store
shall also be provided adjacent to the office campus.
c. TOILET In addition to the toilets in service buildings, one common toilet shall
be provided as per requirement. The facilities shall include water closet,
urinals, washbasin, looking mirror, cistern, towel rail, glass shelf, flush doors
etc. The floor and wall of toilet should be tiled with ceramic tiles. Anti skid
floor tile shall be provided.
Filter bed of adequate capacity shall be provided for firefighting and dust
suppression purpose. The capacity of the reservoir shall be fixed after calculation of
water requirement on the basis of relevant norms/system requirements. Ground
water reservoir shall be covered, with provision of necessary ladders, wash out etc .
Separate water pipe line and arrangements shall be provided for fire fighting and
39
dust suppression purpose.` Pumping facilities shall be provided with 100% standby
arrangement.
All pipe lines and pumping arrangement including construction of pump house and
filter bedis in the scope of this work.
A. DRINKING WATER
Individual PVC over head tanks of required capacity but not less than 1.0 m3
capacity shall be provided over each sub stations/control room, offices, and other
service buildings as per requirement. Necessary receiving and distribution piping and
pumping arrangement is covered in the scope of the work. Adequate drinking points
with PVC tank, shall be provided at all drive houses, transfer points, truck receipt
hoppers complex, bunker, wagon loading systems etc. The distribution system for
drinking water shall be done as per requirement. The facility for drinking water shall
also be provided at suitable points in offices, service buildings, toilets, etc. with all
necessary fittings and fixtures. A separate portable water reservoir of suitable
capacity shall be constructed nearby the main ground water reservoir.
B. DRAINAGE ARRANGEMENT
C. SEWERAGE
Proper sewerage shall be provided for handling of sewage. This will include
provision of septic tank, soak pit, sewer line, man hole, inspection chamber and all
other fittings and fixtures needed for the same.
Industrial effluent from the entire CHP shall be disposed off beyond the boundary of
CHP. However, construction of ETP is not in the scope of the work.
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2.7.4.11 ROADS
Whole of the proposed CHP area shall be well connected with CC roads for
movement of men and materials. These roads shall be well connected with the
existing road network. These roads shall have 7.50 m wide carriage way with
minimum 1.5 m wide shoulders and drains of suitable size and specification on both
sides of the road. The road shall be designed for movement of LMVs like cars,
jeeps, trucks, rubber tyres mounted mobile cranes etc., considering the prevailing
soil conditions. Suitable culverts, if required for free flow of surface drainage shall be
properly designed and provided. The ground bunker, drive houses, all service
buildings, water reservoirs, pump houses, offices, switching stations etc. shall be
well connected with PCC road.
No data regarding the above are made available in this tender document. The bidder
is required to inspect and examine the site and its surroundings and satisfy himself
as to the nature of ground, rainfall and the soil, the availability and suitability of other
requirements, as required for fair bidding purposes. The successful bidder shall have
to undertake detailed survey, detailed soil investigation and collection of hydrological
data, rainfall data, prepare and submit a comprehensive soil report with
recommendations for type of foundation, bearing capacities, method of deep
excavation, probable settlement for foundations etc. for approval of the
SCCL/consultant. Reports approved by the SCCL/consultant shall be finally adopted
for design and engineering. Soil investigation should be done in the presence of the
SCCL/consultant. No extra claim shall be made over contract price for variation in
soil, rainfall and hydrological investigation reports which may result in change of
design and type of foundation. All works related to site survey shall be conducted as
per standard practice and also as per system requirement.
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B. EARTHWORK IN EXCAVATION
Excavation of earth for all types of soil for construction of all the civil structures is
covered in the scope of this contract. Final grading/ levelling and dressing of ground
in and around the proposed CHP area is under the scope of this contract as per
technical and functional requirement. Excavation for proper drainage of rain/ subsoil
water around the truck receipt hoppers complex, ground conveyor, service buildings,
transfer houses, drive houses, switching stations etc. is covered under the scope of
this tender. The depth and size of the excavation will be as per approved system
requirement and as per detail design drawings. All cuttings and fillings as per
required level and profile including transportation/ disposal of soil is included in the
scope of this work.
Bidder shall ensure proper consolidation and stability of the pavement area and its
embankment suitable for plying loaded tippers. Toe wall, dwarf wall or retaining wall,
as required, to protect the embankment shall be provided by the bidder. Side slopes
will have boulder pitching with suitable drainage channel. The HFL, Bed level, water
flow, etc. of the existing water courses, sub-soil water table shall be taken into
consideration while designing the structures. Bidder shall undertake various remedial
measures for protection of the proposed CHP area from streams/water courses as
per requirement.
The proposed CHP complex shall be designed keeping in view its proper aesthetic
appearance. The perspective view of the CHP with landscaping shall be submitted.
To provide better environment and arrest dust around CHP, plantation of approved
variety, should be done to form impervious hedges around the plants and shall be
maintained by bidder for the period of one year after plantation.
D. BOUNDARY WALL
The proposed CHP complex, as shown in the drawing, should be provided with
boundary wall having of 2.0m high brick wall above formation level with concertina
coil type fencing on top of the wall. Layout of boundary wall indicated in the drawing
is tentative and may change as per actual site conditions and functional requirement.
The final layout of boundary wall shall be decided during detail engineering.
Boundary wall shall be properly painted. Gate should be provided in the boundary
wall with main and pedestrian gate as per functional requirements.
E. FIREFIGHTING
Whole of the CHP shall be protected against fire. Automatic fire fighting facilities
shall be provided as per relevant IS codes and TAC norms. Hydrants/spray nozzle
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shall be provided at suitable intervals all along the proposed CHP as per technical
requirement. Water tanks and pump house is included in the scope of work. The
capacity of the water tanks shall be fixed as per relevant norms but shall not be less
than those as mentioned earlier.
Fire fighting points/hydrants shall be provided for entire proposed CHP including
truck receiving hopper complex, transfer points, drives houses, conveyor, galleries,
ground bunker, silo, switching stations and service buildings etc. Fire hydrants shall
be provided at an interval of 30m in the entire plant. Necessary landing valves at all
the floor of silo, switching stations and at other places wherever necessary shall be
provided.
The pressure of each hydrant shall be not less than 3.5 kg/cm2 when up to four
hydrants are used simultaneously.
Proper water supply arrangement for dust suppression and dust extraction will be
made at dust generating points so that all working space remain free of dust. For
dust suppression, water jets will have to be provided in truck receiving hopper area,
transfer points, silo and other places as per requirement. For proper ventilation in all
the working floors, arrangements for installing exhaust fans/ventilation fans with
ducting will have to be made as detailed elsewhere in the tender document.
All civil works pertaining to dust suppression and extraction shall be as per system
requirement. The pumping sets for the dust suppression/control shall be provided
with 100% standby arrangement at each location.
G. PLANT CLEANING
Water and compressed air pipe line network along with connection/tapping points
with control valves at suitable intervals shall be provided in the truck receiving
hopper floors, transfer and drive houses, conveyor galleries, switching-stations,
bunker, silo etc. for pressure cleaning of floor chutes, walkways etc. Proper drainage
arrangement will have to be made all along the plant so that water or slush
accumulation is avoided. At every probable spillage point suitable arrangement will
have to be made for a mechanized or manual cleaning.
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the actual work shall be done by the Bidder to the full satisfaction of Engineer-in-
charge.
The Bidder has to do their own arrangement for construction water at site. One point
for drinking water only, will be provided within 100meterof the work site for which
necessary temporary storage arrangement may be made by the Bidder.
D. SPECIFICATIONS
The specifications should be intended for general description of the work, quality and
workmanship. The work shall be executed according to the relevant Indian Standard
codes of practices or to the recommendations of relevant American and British
Standard in cases where Indian Standard codes are not available for such works.
As such the Bidder should plan the work and items in detail. Generally, steps
required towards the standardization to nearest higher rating of equipment keeping
in view of energy conservation, safety of men and materials, better environment,
shall be considered at any stage before or during execution with due prior approval
with no extra cost to MCL.
It shall be the Bidder's responsibility to bring, receive and keep the materials in safe
custody in proper condition. Responsibility of handling the materials during
manufacturing, transit and handling at site rests with the Bidder. All the equipment
will have to be installed and fitted with accessories as per approved drawing. Entire
tools and tackles, manpower and any other material required for successful
installation will be supplied by the Bidder. The Bidder shall furnish the list of
engineers, supervisors and other skilled personnel to carry out the job properly.
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G. COMMISSIONING
All the tests required for materials, quality of work and any other tests as
required/desired by the Engineer-in-charge shall be at Bidder's cost. The frequency
and mode of testing shall be as per latest relevant IS Standards.
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