NDCT Specs

TITLE : SPECIFICATION NO.
PE-TS-999-165-N004
STANDARD TECHNICAL SPECIFICATION VOLUME : II B
FOR SECTION : D Part-A
NATURAL DRAFT COOLING TOWERS REV. NO. 0 DATE : 22.03.2003
SHEET 1 of 9
1.0 GENERAL:
1.1 This standard specification covers the design, manufacture and assembly, inspection and
testing at the Vendor’s and/or his sub-vendor’s works, suitable painting and packing
requirements for transportation, erection, commissioning and testing at site of all materials and
equipments inclusive of complete electrical and civil works for the Natural Draft Cooling Tower
complete with all accessories as specified hereinafter.
2.0 CODES AND STANDARD:
2.1 The design, manufacture, inspection and testing and performance of the Cooling Tower as
specified hereinafter shall comply with the requirements of all applicable latest
Indian/British/American Standards and Codes of practice. The latest editions of the following
standards and publications shall be followed in particular.
a) Cooling Tower Institution of USA, Bulletin ATP-105: Acceptance Test Code for Industrial
Water Cooling tower.
b) PTC-23: ASME Performance Test Code for Atmospheric Water Cooling equipment.
c) For Electrical, Civil Codes/ Standards refer respective Specification.
d) BS-4485 – Specification for Water Cooling Tower.
2.2 In case of any conflict between the above codes/ standards and this specification, the later shall
prevail and in case any further conflict in the matter, the interpretation of the specification by the
Engineer shall be final and binding.
3.0 DESIGN REQUIREMENTS:
3.1 The Cooling Tower shall be designed for continuous operation to cool not less than the design
flow of water from specified inlet temperature to outlet temperature at a design ambient wet bulb
temperature as indicated under Data Sheet-A enclosed to this specification.
3.2 All the components shall be capable of safe, proper and continuous operation at all cooling
water flows up to and including those specified under Data Sheet-A and shall be designed with
regard to ease of maintenance, repair, cleaning and inspection.
3.3 The cooling tower shall be Natural Draft cross flow/ counter flow type as per enclosed Data
Sheet-A.
3.4 The vendor under this specification shall assume full responsibility in proper design and
operation of each and every component of the cooling tower as well as the cooling tower as a
whole unit.
TITLE : SPECIFICATION NO. PE-TS-999-165-N004
SHEET 2 of 9
3.5 The Cooling tower shall be suitable for handling the fluid as per Data Sheet-A and also for
achieving the specified parameters in Data Sheet-A.
3.6 The Cooling tower shall be designed such that the drift losses and the evaporation losses are
limited to the values as specified in Data Sheet-A.
3.7 The Cooling Tower structure shall be of adequate strength to withstand the wind load and the
effect of earthquake on the structure. Design wind pressure and horizontal/vertical seismic
coefficient shall be taken as mentioned in the specification for civil works enclosed to this
specification.
4.0 CONSTRUCTIONAL FEATURES:
4.1 Casing and Louver (If required):
4.1.1 The Louvers shall be designed for air entry to the tower with low velocity for minimum pressure
drop and less chance of recirculation of moist air. To eliminate splash out, louvers shall slope to
shed water inwards.
4.1.2 The louvers and casing shall be made of material as specified in the Data Sheet-A.
4.2 Partitions:
4.2.1 Partitions shall be provided so that one section can be taken out of service without affecting the
operation of capacity of other section.
4.3 Fill:
4.3.1 Cooling tower fills type and material shall be as specified in Data Sheet-A.
4.3.2 Design and arrangement of the fills shall be so as to expose high air/ water surface with
minimum air pressure drop.
4.4 Fill Supports:
4.4.1 Fills shall be supported at frequent intervals, which shall minimise sag. Possibility of
dislodgement and damage to fill materials as a consequence of induced vibration in the fill.
4.5 Drift Eliminations:
4.5.1 Multipass drift eliminators with minimum two-pass zig zag path type shall be provided so as to
limit the drift loss to that specified in Data Sheet-A.
4.5.2 The eliminator frame shall be of rugged construction and shall be firmly secured to the structural
SHEET 3 of 9
frame to arrest vibration. Suitable access to the eliminator frame work from the basin should be
provided for any maintenance or physical replacement of eliminator blades etc., when the
particular cell is taken out for maintenance.
4.6 Hot Water Distribution System:
4.6.1 Motorised/Manual valves (as indicated in Data sheet A) shall be provided in the hot water
distribution piping such that each section can be isolated without affecting the operation of other
section.
4.6.2 The pipes and valves in hot water distribution system shall be designed to take care of the
possible thermal stresses due to temperature variation. This could be achieved by providing
sliding supports for supporting all the pipes fabricated from carbon steel.
4.6.3 The hot water distribution piping and valves shall be designed for the design pressure as
indicated in the Data Sheet-A.
4.7 Cold Water Basin:
4.7.1 The cooling tower basin shall be constructed in RCC (unless otherwise specified in Data Sheet-
A). The capacity of the cooling tower basin shall be as indicated in Data Sheet-A.
4.7.2 The cold water basin shall be partitioned into two chambers or as specified in Data Sheet-A.
The two sections of the Cooling Tower basin should be separate water tight compartments,
which can be isolated one at a time for cleaning/maintenance purposes.
4.7.3 Sludge pits with isolating valves and spool pipe having flanged ends shall be provided for
individual basin chamber for connection to drainage pipe.
4.7.4 For each basin chamber, there shall be a cold-water outlet channel. In the connection between
basin chamber and cold water outlet channel there shall be a stationary coarse bar screen and
gate in the absence of any specific preference under Data Sheet-A.
4.7.5 Each basin chamber shall have an overflow arrangement and scouring arrangement.
4.8 Submersible sludge Pumps:
4.8.1 The submersible type sludge pumps complete with electric motors, discharge side valves,
piping, supports, hangers and clamps etc. shall be supplied at the option of the purchaser for
each cooling tower for basin draining/ desludging. The quantity, design parameters and the
materials of construction of the vertical sludge pumps shall be as per Data Sheet-A. Each pump
shall be non-clog type, self water lubricated. The vertical sludge pumps shall be treated as an
optional item and are to be offered if asked for in the Data Sheet-A enclosed to this
specification.
SHEET 4 of 9
4.9.0 Screens & Gates in Cold Water outlet Chamber:
4.9.1 The screens shall be vertical stationary type; the opening size and the mesh aperture shall be
as per Data Sheet-A. The guides for the screens to be embedded in the concrete shall be of
material as per Data Sheet-A.
Lifting lugs or eye bolts shall be provided on top of the screen frame for ease of handling.
4.9.2 For handling screens, one set of monorail with supporting structure and chain pulley hoist
complete with lifting chain and trolley for mounting the hoist shall be furnished. The chain pulley
hoist shall be manually operated and shall conform to IS-3832 class-II.
4.9.3 The gates fixed in vertical sections in cold water outlet chamber shall be as per standard
practice and quality, material and type shall be as given in Data Sheet-A.
4.9.4 The isolating valves on the scour lines within the sludge pits shall conform to class I of IS-780
and shall be of reputed make.
4.10 Hardware:
4.10.1 All nails and fastening bolts, nuts and washers etc used in the cooling tower which are coming
in direct contact with water or humid air shall be made of stainless steel 304, all others nuts &
bolts etc. shall be made of HDG steel.
4.11.0 Access:
4.11.1 Two R.C.C. staircases for approach to the hot water distribution level
4.11.2 Doors for entrance into Cooling Tower Distribution level shall be provided as specified in Data
Sheet -A.
4.11.3 Two external ladders for approach to top of cooling tower from water distribution level.
4.11.4 Access/platforms for inspection and maintenance of hot water distribution system along with
spray nozzles.
4.11.5 Suitable arrangement for supporting walkways inside the cooling tower shall be made and
loading of such arrangement shall be independent of the fill material.
4.11.6 Whether specifically mentioned in the data sheet or not, steel components and fittings used in
walkways, handrails and access doors shall be hot dip galvanised after fabrication.
5.0 INSPECTION AND TESTING:
SHEET 5 of 9
5.1 The inspection/ testing of cooling tower and its various components shall be as per the
approved Quality Plans.
5.2 Hydrostatic test for the hot water distribution piping shall be conducted at site after complete
erection. The test pressure and duration shall be as per Data Sheet-A.
6.0 TEST AT SITE:
6.1 The Cooling Tower as a whole shall be tested at site to check and ascertain that the
performance meets the requirements of the specification. It is the responsibility of the vendor to
conduct the performance test of the cooling tower and prove the specified parameters to the
satisfaction of the purchaser. The test shall be witnessed by the purchaser/ customer’s
representative or both, for which 15 days clear notice will be given to purchaser by the vendor.
6.2 The performance test of the cooling tower shall be carried out in accordance with cooling tower
Institute Bulletin No. ATP 105 Acceptance test for Industrial Cooling Tower.
The details of the proposed test procedure shall be submitted by the vendor sufficiently in
advance of the commencement of test for the review and approval of the purchaser.
6.3 Necessary correction curves required for correcting the test results for any difference in test and
guaranteed design condition shall be furnished by the supplier for approval along with the
proposed test procedure.
6.4 All testing and calibrating instruments required for the site performance test shall be arranged
by the cooling tower supplier without any extra cost. All instruments used by the supplier shall
be duly calibrated from a recognised Institution and the same is to be arranged by the supplier.
7.0 PERFORMACNE GUARANGTEE, TOLERANCE & PENALTIES:
7.1 Each equipment shall be guaranteed to meet the performance requirement as specified.
7.2 The tests shall be conducted at the manufacturer’s works/ site in accordance with this
specification and rectification of all defects shall be satisfactory done without charging any extra
amount to purchaser.
7.3 The performance test shall be carried out at site as specified and all defects shall be
satisfactorily rectified within a time period decided by purchaser. No extra amount shall be
charged to purchaser for such rectification. After rectification, retesting will be done by
purchaser/ customer’s representative without any extra cost to purchaser till satisfactory
performance is achieved.
7.4 The vendor shall submit performance curves for the cooling tower showing variation in
performance from the design duty point with change in approach to wet bulb temperature,
SHEET 6 of 9
cooling range, water loading of the tower.
7.5 The vendor shall guarantee the performance of the whole cooling tower plant to meet the
specifications when tested in accordance with cooling tower institute acceptance test code ATP-
105, performance curves as per ATP-105 shall be furnished by the vendor.
7.6 If any defects are observed, the bidder shall rectify the same without extra cost to the
purchaser. Even after rectification if the guaranteed performance is not achieved, then for every
increase of 0.5 degree C or part thereof in the cold water temperature over design conditions, a
sum as specified in data Sheet-A shall be paid by vendor to the purchaser for shortfall of
guarantee, for the cooling tower.
7.6.1 In case the cold water temperature exceeds the acceptable limits of purchaser, the whole plant
will be rejected and the vendor shall refund the entire money paid to him together with any
penalty levied otherwise.
8.0 SPECIAL CLEANING PROTECTION & PAINTING:
8.1 All equipment shall be neatly finished. All exposed metal/ concrete/ wooden surface shall be
smooth and free from burrs/ projections.
The metal surfaces to be painted should be accessible, suitable for priming and affording
maximum protection throughout the life of the plant. The surface preparation shall be done
either mechanically or chemically by one or more of the methods as given in IS-1477 (Part-I)
and shall include the following:
a) Removal of oil, grease, dirt and swarf etc., as per Section 6.1 of IS-1477 (Part-I).
b) Removal of rust and scale etc., as per Section 6.2 of IS-1477 (Part-I).
c) Sand blasting/ shot blasting as per Section 6.2.4 of IS-1477 (Part-I) or wire brushing and
picking as specified in Data Sheet-A.
8.2 INSIDE SURFACE OF PIPING & VALVES IN HOT WATER RISERS:
8.2.1 The inside surfaces of the piping and the valves which are in contact with water and which are
not made of stainless steel or other corrosion resistant materials shall be painted with coal tar
based epoxy paint of approved make and quality over a coat of Zinc Chromate Primer. The
thickness of cured coating shall be as specified in Data Sheet-A.
8.3 Outside Surface of Piping (Buried):
8.3.1 Surface treatment as specified in Data Sheet-A.

SHEET 7 of 9
8.3.2 Coating/ wrapping/ concrete lining as specified in Data Sheet-A.
8.4 Outside Surface or Piping (Exposed):
8.4.1 Surface treatment as specified in Data Sheet-A.
8.4.2 One coat of red oxide primer.
8.4.3 Synthetic enamel paint of approved shade, make and quality. The thickness of cured coating
shall be as specified in Data Sheet-A.
8.5 All steel parts used for cooling tower construction shall be hot dip galvanised as per IS-4736
after shop fabrication. The external surfaces of the flow regulating valves access platform,
access door and also the hoisting derrick subjected to hot water fumes shall also be thoroughly
cleaned and treated and shall be coated with rust preventing paints.
8.6 All parts shall be properly boxed, crated or otherwise protected for transportation. Exposed
metal finished surfaces shall be thoroughly greased before transportation.
8.7 The external and internal surfaces of the tower shall also be painted.
9.0 DRAWING AND DATA AFTER AWARD OF CONTRACT:
The vendor shall furnish drawings and other technical documents as given in Data Sheet-C,
enclosed with the specification.
10.0 SPECIAL TOOLS & TACKLES:
Special tools & tackles, if any, shall be included in scope of supply by the vendor. A list giving
description of such tools & tackles shall be furnished by vendor.
DATA SHEET –C
FOR
NATURAL
NATURALDRAFT
DRAFT COOLING TOWERS
COOLING TOWERS REV. NO. 0 DATE : 22.03.2003
SHEET 8 of 9
DATA / DOCUMENTS TO BE FURNISHED BY VENDOR AFTER AWARD OF

CONTRACT
1. General Arrangement drawing of complete cooling tower (showing plan, front elevation
and side elevation) incorporating principal dimensions limits of scope of supply of piping,
limits of civil works included, showing extent of platforms, walk ways, handrails, access
doors staircase, end wall derrick etc. and the limits of scope of supply of electrical works.
2. General Arrangement drawing of Cooling Tower basin indicating overflow and

desludging arrangement.
3. General Arrangement and Sectional Assembly drawings pertaining to the following

components of the Cooling Tower.
a) Tower fill with supporting arrangement.
b) Drift eliminator installation and details.
c) Complete hot water distribution system including flow regulating valves, distribution
basin/ pipes and nozzles etc.
4. Arrangement drawing of the cold water outlet chambers and sludge pits incorporating
also the arrangement of screens, gates, valves and piping terminal details.
5. Cooling tower performance curves showing wet bulb temperature V/s. cold water
temperature for design cooling range, 90% cooling range and 110% cooling range at
90% ,100% and 110% of design flow.
6. Detailed GA and sectional assembly drawing of BF valves in hot water risers indicating
materials of construction of various components.
7. General Arrangement and cross-sectional assembly drawings of sludge pumps and

motor drives along with their performance curves.
8. Electrical drawings and data.
i) Cable Schedule
ii) Cable tray and trench layout.
iii) Drawing on illumination system of cooling tower structure including wiring
diagram showing conductor and conduct sizes and design calculation.
iv) Drawing on Aviation Obstruction Lighting System.
v) Drawing on grounding system inclusive of lighting protection system.
DATA
STANDARD SHEET
TECHNICAL –C
SPECIFICATION VOLUME : II B
FOR
NATURAL DRAFT COOLING TOWERS
SHEET 9 of 9
vi) Drawing of lighting sub-distribution board & junction boxes.
10. Drawings, data and calculation on civil works :
I) Design calculations for strength and suitability showing justification for size of
members chosen for all structural components of cooling towers inclusive of
prestressed concrete fill where applicable. All civil and structural design
calculations shall be furnished by the supplier for approval of the purchaser.
ii) Load drawings setting out clearly and concisely the various loads taken into
consideration for design.
iii) Civil drawings for cold water basin, sludge sumps, connecting channels, partitions,
louvers, end walls, longitudinal beams, hot water distribution basin, its covering,
staircase, platforms, cable trenches, etc. all complete.
iv) Bar bending details for all reinforced concrete structures.
v) Insert details, anchor bolt details.
vi) Final painting schedule.
vii) Other drawings & data as necessary.
11. Test procedure along with details of tests to be conducted for the offered cooling tower.
12 Quality Plan along with complete details of the testing and inspection requirements of
mechanical and electrical items of the cooling tower in BHEL format.
13. Operation and Maintenance Manuals
14. Field Quality Plan for site activities – viz. Civil works & Erection.
15. Cooling tower performance test procedure.

TITLE: SPEC. NO.: PE-TS-412-165-N001
TECHNICAL SPECIFICATION VOLUME: II B
COOLING TOWER SECTION: D1
2X660 MW ENNORE SEZ STPP REV. NO. 0 DATE 12.12.14
DATASHEET - A SHEET 1 OF 6
1.0 GENERAL INFORMATION
No. of Cooling Towers required : Two (02) nos.
Location Out door
Duty Continuous
Type Natural draft Counter flow with PVC

Splash Bar type
EL (+) 0.5 M
Basin Sill level
EL (+) 0.0 M
Finished ground level
2.0 DESIGN PERFORMANCE FOR EACH

COOLING TOWER
2.1 Design Cooling water flow : 90000 M3/hr.
2.2 Design ambient wet bulb temp. : 28.0 oC
2.3 Design inlet air wet bulb temperature. : 28.0 oC
2.4 Approach w.r.t. design inlet air wet bulb : 5.0 oC

temperature (viz. 28.0oC)
2.5 Cold water temperature : 33 oC
2.6 Hot water inlet temperature : 42 oC
2.7 Cooling Range : 9 oC
2.8 Design ambient Relative Humidity : Based on meterological data of Chennai

for last 50 years
2.9 Liquid Handled : Sea water (refer details of cooling

water analysis)
a) Total CW Pumping head permissible : Not to exceed 16 MWC

viz. static head plus frictional losses
as below:
x Static head w.r.t. FGL

x Frictional losses within
bidders T.P. with 10%
margin
x Velocity head
2.10 Maximum permissible drift loss : Max. 0.005 %
2.11 Design pressure for hot water : 5 kg/cm2(g)

distribution system
2.12 Maximum Basin Diameter : 130 M
2.13 Maximum Cooling tower flow : Min 120% of design CW flow.

capacity to be considered for
design of hot water distribution
and cold water channel
3.0 SPECIAL FEATURES
3.1 Basin type Sectionalized (two compartment) by

partition wall. Each basin chamber shall
have overflow arrangement and sludge pit
end with necessary dewatering
arrangement.
3.2 Whether fills are removable : Yes
3.3 Fills supporting by nailing : NO

acceptable
4.0 Cold Water Basin Details
4.1 Finished ground level : EL (+) 0.0 M
4.2 Maximum water level : EL (+) 0.2 M
4.3 Min. Water level : EL (-) 0.95 M
4.4 Storage capacity between : 10 minutes (Between Max. & Min. Water
Normal and minimum water Level) of Cooling tower design Flow.
levels.
4.5 Invert level of CT Basin : EL (-) 1.45 M (at basin centre)

4.6 Invert level of CW Channel : EL (-) 5.15 M
near CT level
4.7 a) Depth of Sludge pit : Suitable for complete dewatering. To

include sludge pump submergence &
clearance depth below basin/ channel
invert level
b) Submersible type sludge : 1 working + 1 standby

pumps (Min capacity of 200 cub M / hr
OR
Pumps sized to empty each basin
partition in 10 hrs whichever is higher.)
4.8 Number of sludge pits : Common sludge pit with inter connection
with both compartments of CW basin.
4.9 Number of cold water outlet : One for each compartment of CW basin.
channels Cold water outlet shall be 10 M wide
(clear width – excluding wall thickness) at
CT basin outlet for each compartment. At
T.P Bidder to match same as per T.P.
Drawing.
4.10 Depth of CW channel 5.15 M up to FGL (Ref Annexure-1)
4.11 Number of screens and gates in : One for each compartment of CW basin
common outlet channel
4.12 Maximum allowable effective velocity
through Cold water channel at Min. : 0.6 M/Sec.
Water Level
4.13 Maximum allowable effective velocity 1.2 M/Sec.

through gates at Min. Water Level :
4.14 Max. allowable effective velocity : 0.6 M/Sec.

through screens at Min. Water Level
4.15 Length of outlet channel including : As per terminal point details in Section C1
expansion joint in bidder’s scope and details as shown in the enclosed
Annexure-2.
5.0 COOLING TOWER ACCESS

DETAILS
5.1 Required number of stair : Two (2) Nos.

cases from ground level up to
hot water inlet trough cooling
tower roof
5.2 Number of cage ladders from : Total Four (4) Nos.: Two from reinforced
ground floor to cooling tower concrete stairs to platform at the top of the
top. tower and other two shall be from ground
level itself.
5.3 Internal walkway of platform : Peripheral walkway above fill level inside
with hand rails of the cooling tower
5.4 External walkway platform : 1.2 M width around the circumference at

top and at each aviation lamp levels
5.5 Platform for access of BFV : Provided by Bidder.
6.0 HOT WATER SUPPLY : As per terminal point Annex-2 enclosed.

HEADER TERMINALS CW RCC Duct piping in BHEL scope
4000mmX3000mm shall be terminated
with centre line of pipe elevation as shown
in sketch. Further RCC Duct/Piping from
T.P. with isolating Motorized B.F. Valves
in each riser shall be in bidder’s scope.
7.0 SCOPE OF SUPPLY :
7.1 Cooling tower basin outlet : Yes

channels/ sump and sludge
pits
7.2 Hot water piping to distribution Duct : Yes
7.3 Hot water header isolation valves( : Yes

motorised ) on risers
7.4 Flanges/counter flanges for all flanged : Yes

connections with bolts, nuts & gaskets
etc.
7.5 Screen & guide for each cold water : Yes

outlet sump/ channel
7.6 Stop Log gate with guides and sealing : Yes

device for each cold water outlet sump/
channel.
7.7 Isolation valves in sludge pit : Yes
7.8 Drain Piping from sludge pit to terminal : Yes

point
7.9 Pulley block for lifting each screen and : Yes

stop log gate in cold water outlet sump/
channel
7.10 All necessary supports, hangers : Yes
7.11 Base plates, foundation plates, anchor : Yes

bolts, sleeves, inserts, bolts, nuts for all
equipment supplied
7.12 Drift Eliminator : Yes
7.13 Electrical
As per electrical plant specification : Yes
7.14 All related Civil works included : Yes
8.0 MATERIAL OF CONSTRUCTION
8.1 Cold water basin, outlet channel/ sump : R.C.C.

& sludge pit.
8.2 Shell : R.C.C
8.3 Basin partition wells : R.C.C

8.4 Internal walk way : R.C.C.
External walkway platform R.C.C
8.5 Staircase/Ladders : R.C.C./SS 316
Hand rail Hot dip galvanized steel
8.6 Supporting structures : R.C.C.
Hot water distribution basin R.C.C
8.7 Hot water distribution nozzles : Polypropylene
8.8 Fills : PVC Splash Bar
8.9 Fill support col, beams & trusses : R.C.C

8.10 Louvers : R.C.C.
8.11 Drift eliminators : PVC UV Stabilised
8.12 Fasteners/wetted parts : SS-316L
8.13 Piping Above 150 Nb : Carbon steel plates to IS
2062 internally lined with CorroCoat or
Poly Urea Coating of 1500 Microns DFT,
rolled and welded as per IS 3589
Below and 150 Nb : IS 1239 (Heavy
Grade) internally lined with CorroCoat or

Poly Urea Coating of 1500 Microns DFT
Water Distribution Pipes (Inside CT) :

8.14 GRP/FRP
8.15 Hot water line valves
a) BF Valves : Body: Duplex SS

Shaft: Duplex SS
Test pressure & duration shall comply
with AWWA C504
b) Sludge pit isolation valves
Body : Duplex SS
Spindle & Trim : Duplex SS
8.16 Sludge outlet pipe : As per the material specified above in

8.13
8.17 Submersible Pumps : Casing: Duplex SS
Impeller: Duplex SS
8.18 Stop log gates with rubber seals in cold : SS 316L

water outlet channel
8.19 Guide for stop log gates : SS-316L
8.20 Screen : SS -316L
8.21 Guide for Screen : SS- 316L
8.22 Bolts, buts & other hardware : SS-316L
Note:
(a) Carbon /Mild steel parts or structures used in Cooling Tower or its vicinity shall be Heavily
Galvanised.
(b) Material of construction for items not specified shall be subject to purchaser’s approval during
detailed engineering stage, in the event of order.
9.0 Pipe work Painting / Protection of Pipes:
9.1 Internal surface Surface preparation : Sand blast to SA 2.5

Internal Paint: Application of two(2) coats
of ( DFT of each coat 40 to 50 microns )
Epoxy based Zinc rich primer followed by
2 to 3 coats of coal tar epoxy paint to
achieve total DFT of min. 150 microns.
9.2 External surface – over ground piping: Surface preparation : Sand blast to SA 2.5
Internal Paint: Application of two(2) coats
of ( DFT of each coat 40 to 50 microns )
Epoxy based Zinc rich primer followed by
2 to 3 coats of coal tar epoxy paint to
achieve total DFT of min. 150 microns.
9.3 External surface – Burried piping: Surface preparation: Sand blast to SA

2.5
External Paint:
Intermediate: Coal tar primer compatible
with coal tar enamel grade. The number
of coats shall be two with a DFT of 35
microns each.
Final Coat: Coal tar enamel shall be

applied. A single spiral inner wrap of glass
fibre tissues shall be applied overlapping
at least 25 mm ensuring impregnation of
glass fibre tissues in the first coat. The
second coat of enamel and second outer
wrap of glass fibre felt, Type – I to IS:
7193-1974 will be applied in the same
way confirming to Table – 10 of IS –
10221 – 1982. The total thickness of the
coating will not be less than 4.0 mm
Alternatively, Wrapping with coal tar

based anticorrosion tape conforming to IS
15337: 2003. Wrapping thickness shall be
4.0 mm.
INSPECTION AND TESTING
10.0 Quality Surveillance by : Manufacturer, purchaser and customer
10.1 Material testing and identification : Required
10.2 Stage inspection to be witnessed by : Yes

Purchaser and customer
10.3 Hydrostatic test for piping & valves : Yes

required
10.4 Hydrostatic test to be witnessed by : Yes

Purchaser and customer
10.5 Field performance test of individual : Yes

items and the cooling tower as a whole
required
10.6 Field performance test to be done by : Approved CTI agency along with bidder
for one Tower. For remaining towers by
Bidder.
10.7 All testing instruments by supplier : Yes
10.8 Commissioning at site by : Bidder
10.9 Mandatory spares: : Refer Section C4 of Vol IIB
Attachments:
a) Sketch showing details CT and CW Channel Levels. Annexure-1.
b) Key Plan showing Terminal Points- Annexure-2.
DESEIN Vol.III: Mechanical Works
Sea Water Treatment Plant
SEA WATER ANALYSIS
S.No. Parameter Unit Value (Range)

1 General
a pH 7.94-8
b Conductivity millisiemens/cm 43.8-44.1
c Temperature Deg C 25-32
d Turbidity NTU 20-40
e Total Organic carbon PPM of C 2.4-2.84
(total/ dissolved)
f CO2 Mg/l <2
g TDS Mg/l 39600-39740
h BOD Mg/l 10-12
i COD Mg/l 88-96
j Oil & Grease Mg/l <10
k Phenols Mg/l 0.08-0.09
l Free Residual Chlorine Mg/l <0.2
2 Cations
a Cacium Mg/l 459-478
b Magnesium Mg/l 1510-1516
c Sodium Mg/l 10100-12000
d Potassium Mg/l 358-450
e Ammonia Mg/l 4.43-5.42
f Stontium Mg/l 12.9-12.4
g Barium Mg/l 1.55-1.58
h Aluminum Total Mg/l 1-1.8
i Aluminum Dossolved Mg/l 0.8-1.0
j Manganese Total Micro g/l 0.2-0.6
k Manganese Dissolved Micro g/l 0.1-0.2
l Iron total Micro g/l 220-260
m Iron Dissolved Micro g/l Below detectable limit
(detectable Limit : 10)
3 Anions
a Chloride Mg/l 18994-19194
b Sulphate Mg/l 3710-3949
c Nitrate Mg/l 136-152
d Nitrite Mg/l 0.46-0.62
e Bicarbonate Mg/l 144-148
f Carbonate Mg/l Nil
g Fluoride Mg/l 2.64-2.8
h Boron Mg/l 0.14-0.17
i Phosphate Micro g/l 240-380
j Sulphide Micro g/l Below detectable limit
k Silica Dissolved Micro g/l as SiO2 200-250
4 Heavy Metals
A Arsenic Micro g/l Below detectable limit
B Mercury Micro g/l Below detectable limit
C Cadmium Micro g/l 120-130
D Copper Micro g/l 200-220
E Nickel Micro g/l 470-490
F Molybdenum Micro g/l Below detectable limit
2 x 660 MW Ennore SEZ Supercritical Thermal

Power Project at Ash Dyke of NCTPS
Spec. No. CE/C/ P & E/ EE/ E/OT No.3 /2013-14
Vol. III: 293
DESEIN Vol.III: Mechanical Works
Sea Water Treatment Plant
5 Suspended Particle Size

Range
A 10 micron & above Mg/l Below detectable limit
B 5 micron to 10 micron Mg/l Below detectable limit
C 1 micron to 5 micron Mg/l Below detectable limit
D 0.1 micron to 1 micron Mg/l 20-26
6 Colloidal Particle Size
Range
A SDI (10 Minutes) - 10-20
B SDI (5 Minutes) - 20-40
7 Density of sea water Kg/ cum 1030
Note : Unless otherwise indicated all elements shall be expressed in respective ionic form only.
2 x 660 MW Ennore SEZ Supercritical Thermal

Power Project at Ash Dyke of NCTPS
Spec. No. CE/C/ P & E/ EE/ E/OT No.3 /2013-14
Vol. III: 294
CUSTOMER : PROJECT TITLE : SPECIFICATION NO. :
QUALITY PLAN BIDDER/ : STANDARD QP NO. : PE-QP-999-558-E001, REV.0 SPECIFICATION TITLE :

VENDOR
SHEET 1 OF 5 SYSTEM ITEM :ILLUMINATION DOC. NO. :
SL. COMPONENT/OPERATION CHARACTERISTIC CAT. TYPE/ EXTENT OF REFERENCE ACCEPTANCE FORMAT AGENCY REMARKS
NO. CHECK METHOD OF CHECK DOCUMENT NORM OF RECORD
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.0 LUMINAIRES & LAMPS 1. ACCEPTANCE TEST
IS 10322 / IS 10322 /
a) VISUAL MA VISUAL IS 10322 APPD APPD TEST CERT 3/2 1 -
AFTER SUCCESSFUL
DRG./DATASHEET DRG./DATASHEET
COMPLETION OF 1a, 1b & 1c
(PART5 SEC1)
FURTHER TESTING OF 1d) TO BE
DONE BY PAPER INSERTION
b) IR (Dry) CR ELECTRICAL IS 10322 -DO- -DO- -DO- 3/2 1 -
METHOD.
c) HIGH VOLTAGE CR ELECTRICAL -DO- -DO- -DO- -DO- 3/2 1 -
d) DUST PROOF CR ELECTRICAL -DO- -DO- -DO- -DO- 3/2 1 -

*:ONE NO. LUMINAIRE OF
EACH TYPE TO BE WITNESSED
e) PHOTOMETRIC CR ELECTRICAL -DO- -DO- -DO- -DO- 3/2 1* -
BY BHEL. MAIN VENDOR TO
WITNESS AS PER IS-10322.
2. ROUTINE TEST
IS 10322 / IS 10322 /
a) VISUAL MA VISUAL 100% APPD APPD TEST CERT 3/2 - 1
DRG./DATASHEET DRG./DATASHEET
b) IR (Dry) CR ELECTRICAL -DO- -DO- -DO- -DO- 3/2 - 1
c) HIGH VOLTAGE CR ELECTRICAL -DO- -DO- -DO- -DO- 3/2 - 1
IS 10322. IS 10322.
ONE OF EACH
3. TYPE TEST MA ELECTRICAL IEC-62384/ 61347 IEC-62384/ 61347 TEST REPORT 3/2 - 1** ** Refer note 3 & 4
TYPE
FOR LED FOR LED
2.0 LIGHTING PANELS AND 1.DIMENSIONS MA MEASUREMENT 10% APPD DRG. APPD DRG. INSPT. REPORT 3 2,1 - COMPONENTS TO BE OF
LIGHTING DISTRIBUTION APPROVED MAKE
APPD DRG./DATA APPD DRG./DATA
BOARDS/ FEEDER PILLAR 2.PAINT SHADE/ MA VISUAL/ -DO- INSPT. REPORT 3 2,1 -
SHEET SHEET
THICKNESS MEASUREMENT
1/ SIZE & APPD DRG./DATA APPD DRG./DATA

3.DEGREE OF MA TESTS TEST CERT - - 2,1
RATING SHEET SHEET
PROTECTION RELEVANT IS RELEVANT IS
(INCLUDING
EXPLOSION
PROOF IF ANY)
APPD DRG./DATA APPD DRG./DATA

4.FUNCTIONAL TEST MA ELECT. 100% INSPT. REPORT 3 2,1 -
SHEET SHEET
5.HV/IR/HV MA ELECT 100% 2.5KV AC FOR 2.5KV AC FOR INSPT. REPORT 3 2,1 -
1 MINUTE 1 MINUTE
BHEL PARTICULARS BIDDER/VENDOR

NAME
SIGNATURE
DATE BIDDER'S/VENDORS COMPANY SEAL
LEGEND : 1 - BHEL/ CUSTOMER 2 - VENDOR 3 - SUB- VENDOR P - PERFORM W - WITNESS V - VERIFICATION

VENDOR
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
IS: 8623 (PART-1)/ IS: 8623 (PART-1)/

6. TYPE TEST MA ELECT 1/RATING IEC-439-1/ IS:60947/ IEC-439-1/ IS:60947/ TEST REPORT 3/2 - 1** ** Refer note 3 & 4
APPD DATA SHEET APPD DATA SHEET
3.0 LIGHTING TRANSFORMER 1. ROUTINE TEST

IS 11171 / APPD IS 11171 / APPD
a) TYPE / RATING CR VISUAL 100% INSPT. REPORT 3 2,1 -
DRG./DATA SHEET DRG./DATA SHEET
IS 11171 / APPD IS 11171 / APPD

b) WIND. RESISTANC CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

c) V. RATIO /VECTOR CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

d) Z VOLT/ Z SCKT CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

e) LOAD LOSS/ CURRENT CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

f) NO LOAD LOSS CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

g) SOURCE WITHSTAND CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

h) INDUCED O/V CR TEST 100% INSPT. REPORT 3 2,1 -
IS 11171 / APPD IS 11171 / APPD

2. TYPE TEST MA TEST 1/RATING TEST REPORT 3/2 - 1** ** Refer note 3 & 4
4.0 CONDUITS 1.MATERIAL MA VISUAL,MECH, APPD IS:9537 IS:9537 INSPT. REPORT 3 2 1

& CHEMICAL DATASHEET/
IS 9537
2.DIMENSIONS MA MEASUREMENT APPD IS:9537 IS:9537 INSPT. REPORT 3 2 1

DATASHEET/
IS 9537
3. MECH. PROPERTIES
a) BENDING TEST CR TEST IS 9537-II IS-9537 IS-9537 INSPT. REPORT 3 2,1 -
FOR SAME MANUFACTURER, 1st
b) COMPRESSION CR TEST IS 9537-II IS-9537 IS-9537 INSPT. REPORT 3 2,1 - LOT WILL BE WITNESSED BY
BHEL, SUBSEQUENT LOT CAN BE
BHEL APPPD CLEARED BASED ON TEST
APPPD DATASHEET/ APPPD DATASHEET/
c) BEND CR TEST DATASHEET/ IS INSPT. REPORT 3 2,1 - WITNESSED BY MAIN VENDOR.
IS 9537 IS 9537
9537
4. GALVANISATION TEST
a) ZINC COATING CR TEST IS 9537-II IS-2633 IS-2633 INSPT. REPORT 3 2,1 -
NAME
SIGNATURE

VENDOR
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
IS-6745/4759/ APPD IS-6745/4759/ APPD

b) MASS OF ZINC COAT. CR TEST IS 9537-II INSPT. REPORT 3 2,1 -
DATASHEET DATASHEET
IS-9537/ APPD IS-9537/ APPD

c) COATING THICKNESS CR TEST IS 9537-II INSPT. REPORT 3 2,1 - BY ELCOMETER
DATASHEET DATASHEET
d) EPOXY THICKNESS MA VISUAL/PHYSICAL IS 9537-II 50 MICRONS 50 MICRONS INSPT. REPORT 3 2,1 -
5.0 ELECTRIC POLES
5.1 MATERIAL 1.CHEMICAL MA CHEM. IS 2713 IS-2713 IS-2713 -DO- 3/2 - 2,1
COMP. ANALYSIS IS:228 & IS:228 &
IS:1608 IS:1608
2.PHYSICAL MA PHY.TESTS -DO- -DO- -DO- -DO- 3/2 - 2,1

PROP.
5.2 FINAL INSPECTION 1.WORKMANSHIP MA VISUAL & MEAS IS 2713 APPD DRG./ APPD DRG./ -DO- 3/2 2,1 - FOR DEFLECTION & DROP
AND FINISH IS:2713 IS:2713 TEST, TC VERIFICATION
BY BHEL
2.DIMENSIONS MA -DO- -DO- -DO- -DO- -DO- 3/2 2,1 -
3.WEIGHT MA -DO- -DO- -DO- -DO- -DO- 3/2 2,1 -
4.TESTS AS MA -DO- -DO- IS-2713 IS-2713 -DO- 3/2 2,1 -

PER IS-2713

NAME
SIGNATURE

VENDOR
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
6.0 HIGH MAST
TEST
6.1 High Mast Shaft a) Dimensional conformity MA MEASURE 10% or Min. 2 Nos.APPD DRG. APPD DRG. 3 2,1 -
CERTIFICATE
b) Galvanising MA MEASURE -do- DATASHEET DATASHEET -do- 3 2,1 - BY ELCOMETER
APPD DRG/ APPD DRG/

6.2 Head Frame a) Dimensional conformity 3 2,1
MA MEASURE -do- DATASHEET DATASHEET -do-
6.3 Lantern Carriage a) Dimensional conformity MA MEASURE -do- -do- -do- -do- 3 2,1 -
b) Galvanising MA MEASURE -do- -do- -do- -do- 3 2,1 -
6.4 Double drum Winch a)Load Capacity MA MEASURE -do- -do- -do- -do- 3/2 2 1 Test certificate will be submitted by
vendor
6.5 Stainless Steel Wire a) Breaking Capacity M MEASURE 100% -do- -do- -do- 3/2 2 1 Test certificate will be submitted by
Ropes vendor
Test for feeder pillar shall be as per

6.6 FEEDER PILLAR
S. No. 2
APPD DRG/ APPD DRG/

7.0 JUNCTION BOXES & 1.DIMENSIONS MA MEASUREMENT 100% INSP. REPORT 3 - 2 COMPONENTS TO BE OF
DATASHEET DATASHEET
RECEPTACLES APPROVED MAKE
APPD DRG/ APPD DRG/
2.PAINT SHADE/ MA VISUAL/MEAS. 10% -DO- 3 - 2
DATASHEET DATASHEET
THICKNESS
3.HV/IR/HV MA ELECT.TESTS 100% 2KV AC FOR 2KV AC FOR -DO- 3 - 2

1 MINUTE 1 MINUTE
4.DEGREE OF MA TEST 1/SIZE IS:2147/ APPD DRG IS:2147/ APPD DRG TEST CERT. 3 - 2,1
PROTECTION
5.SPECIAL TESTS MA TEST 1/SIZE IS:2147/ APPD DRG IS:2147/ APPD DRG TEST CERT. 3 - 2,1
IF ANY,EXPLOSION
PROOF/FLAME PROOF
6. OPERATION CHECK MA TEST 10% APPD DRG APPD DRG INSP. REPORT 3 - 2
7. MECHANICAL MA TEST 10% APPD DRG APPD DRG INSP. REPORT 3 - 2

INTERLOCK
NAME
SIGNATURE

VENDOR
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
8.0 PVC WIRES 1.SURFACE MA VISUAL 10% IS:694 IS:694 INSPN. 3 - 2,1 TO BE PROCURED FROM
DEFECTS IS:1554 IS:1554 REPORT BIS APPROVED SOURCE
& TEST
REPORT
FROM
MANUFACTURER
2.DIMENSIONS MA MEASUREMENT 10% -DO- -DO- -DO- 3 - 2,1
3.ACCEPTANCE MA -DO- IS: 694 -DO- -DO- -DO- 3 - 2,1

TESTS
4.ROUTINE MA -DO- 100% -DO- -DO- -DO- 3 - 2,1

TESTS
5.TYPE TESTS CR ELEC.TESTS ONE/TYPE IS:694 IS:694 TEST CERT. 3 - 1** ** Refer note 3 & 4
& SIZE IS:1554 IS:1554
NOTES:
1. IN CASE TYPE TEST CERTIFICATE FOR DEGREE OF PROTECTION/EXPLOSION PROOFNESS FROM INDEPENDENT LAB. IS NOT
AVAILABLE, THE ITEM SHALL BE TESTED AT AN INDEPENDENT LAB.
2. ITEMS LIKE CEILING FANS, EMERGENCY LIGHTING UNIT, FLEXIBLE CONDUIT, EARTHING WIRE & FLATS, 24V SUPPLY MODULE, LADDERS, HUME PIPE,
SWITCHBOXES, EXIT SIGNS, STRUCTURAL STEEL ETC. WILL BE CLEARED BASED ON COC (CERTIFICATE OF COMPLIANCE).
3. TYPE TEST CERTIFICATES TO BE FURNISHED FOR VERIFICATION BY BHEL ENGINEERING/CUSTOMER.
4. CONDUCTION OF TYPE TESTS TO BE DONE IF REQUIRED BY BHEL TECHNICAL SPECIFICATION & TEST CERTIFICATES FOR THE SAME TO
BE FURNISHED FOR VERIFICATION BY BHEL ENGINEERING/CUSTOMER.
5. TYPE TEST REPORT DULY VERIFIED BY BHEL ENGINEERING/CUSTOMER SHALL BE SUBMITTED FOR VERIFICATION DURING INSPECTION.

NAME
SIGNATURE
QUALITY PLAN BIDDER/ : STANDARD QP NO. : PE-QP-999-509-E001, REV. 0 SPECIFICATION TITLE:

VENDOR
SHEET 1 OF 2 SYSTEM EARTHING ITEM : EARTHING & LIGHTNING PROTECTION MATERIALS DOC. NO. :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.0 RAW MATERIAL
1.1 MILD STEEL (FLATS & RODS) 1.CHEMICAL & MA VERIFICATION, 100% IS:2062 IS:2062 MILL TC 3 - 1/2 Refer note in
AS PER SPECIFICATION PHYSICAL OF TC'S Remark at Sl. No.3
PROPERTIES
2.DIMENSIONS MA MEASUREMENT 100% IS - 1730 IS - 1730 QC RECORD 3/2 - -
3.SURFACE MA VISUAL 100% IS : 1079 IS : 1079 QC RECORD 3/2 - -

FINISH
1.2 ZINC 1.CHEM.COMP. MA CHEM.TEST SAMPLE IS - 209 IS - 209 QC RECORD 3/2 - 1/2
2.0 IN-PROCESS
2.1 CUTTING, DRILLING 1.DIMENSIONS MA MEASUREMENT 100% APP. DATA SHEET/ APP. DATA SHEET/ QC RECORD 2 - 1
APP. DRAWING APP. DRAWING
2.SURFACE MA VISUAL 100% FREE FROM FREE FROM QC RECORD 2 - 1

FINISH DEFECTS & SLAG DEFECTS & SLAG
2.2 SURFACE PREPARATION 1.CLEANING MA VISUAL PERIODIC IN IS:2629 IS:2629 QC RECORD 2 - -

PICKLING, EACH SHIFT
RINSING,
& FLUXING
2.SURFACE MA VISUAL 100% IS:2629 IS:2629 QC RECORD 2 - -

QUALITY

NAME
SIGNATURE
QUALITY PLAN BIDDER/ : STANDARD QP NO. : PE-QP-999-509-E001 REV. 0 SPECIFICATION TITLE:

VENDOR
SHEET 2 OF 2 SYSTEM EARTHING ITEM : EARTHING & LIGHTNING PROTECTION MATERIALS DOC. NO. :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
2.3 GALVANISING 1.TEMPERATURE MA TEMPERATURE CONTINUOUS IS - 2629 IS - 2629 QC RECORD 3/2 - - If vendor doesn't have his own galvanizing plant
OF BATH INDICATOR duly approved by BHEL PEM; then galvanizing
shall be carried out at BHEL-PEM approved
2. DROSS MA VISUAL PERIODIC IS - 2629 IS - 2629 QC RECORD 3/2 - - other galvanizing plants as per Annexure-2.
3. RATE OF MA VISUAL/ 100% IS - 2629/ IS - 2629/ QC RECORD 3/2 - 2

IMMERSION MEASUREMENT MFRS PRACTICE MFRS PRACTICE
4.SURFACE MA VISUAL 100% IS - 2629 FREE FROM BURRS, QC RECORD 3/2 - -

QUALITY ROUGHNESS,
SLAG, FLUX, STAIN
ETC.
3.0 FINISHED ITEMS 1. CHEMICAL MA CHEMICAL 1 No./LOT/SIZE IS-2062 IS-2062 LAB TC 2 - 1 Note : Sample shall be
selected by BHEL & testing
2.DIMENSIONS MA MEASUREMENT IS 2500 (PART 1)APP. DATA SHEET/ APP. DATA SHEET/ INSP. REPORT 2 1 - shall be done at NABL/ govt.
LEVEL S-4 APP. DRAWING APP. DRAWING approved lab
3.SURFACE FINISH MA VISUAL IS 2500 (PART 1)FREE FROM FREE FROM INSP. REPORT 2 1 -
LEVEL S-4 BURRS, SLAG, BURRS, SLAG,
ROUGHNESS, ROUGHNESS,
FLUX, STAIN, FLUX, STAIN,
ETC. ETC.
4.MASS OF MA CHEM. TEST IS - 4759 IS-6745 / APP. DATA SHEET INSP. REPORT 2 1 -
ZINC COATING APP. DATA SHEET
5.UNIFORMITY MA CHEM. TEST IS - 4759 IS-2633 IS-2633 INSP. REPORT 2 1 -

OF ZINC COATING
6.THICKNESS MA ELCOMETER IS - 4759 APP. DATA SHEET APP. DATA SHEET INSP. REPORT 2 1 -
OF ZINC COATING
6.ADHESION MA MECH.TEST IS-4759 IS-2629 IS-2629 INSP. REPORT 2 1 -

NAME
SIGNATURE

VENDOR
SHEET 1 OF2 SYSTEM CABLING ITEM : CABLE TRAY SUPPORT MATERIAL (WELDED TYPE) DOC. NO. :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.0 RAW MATERIAL
1.1 MILD STEEL SECTIONS (CHANNEL 1.CHEMICAL & PHY. MA VERIFICATION 100% IS -2062 IS -2062 MILL TC 3 - 1/2 Steel shall be procured from
& ANGLES) AS PER SPECIFICATION PROPERTIES OF TC'S SAIL/TISCO/RINL/BHUSAN/JINDAL STEEL/JINDA
ISPAT/ESSAR/LLOYD/ IISCO/ authorised SAIL
Re Rollers.
2.DIMENSIONS MA MEASUREMENT 100% IS - 808/ IS - 1852 IS - 808/ IS - 1852 QC RECORD 3/2 - -
3.SURFACE MA VISUAL 100% IS:2062 IS:2062 QC RECORD 3/2 - -

FINISH
1.2 ZINC CHEM.COMP. MA CHEM. TEST EACH HEAT IS-209 IS-209 QC RECORD 3/2 - 1/2
2.0 IN-PROCESS
2.1 CUTTING 1.DIMENSIONS MA MEASUREMENT 100% APP. DATA SHEET APP. DATA SHEET QC RECORD 2 - 1
2. WELDING MA VISUAL 100% GOOD WELDING FREE FROM QC RECORD 2 - 1

QUALITY PRACTICE DEFECTS & SLAG
(IF APPLICABLE)
3.SURFACE MA VISUAL 100% FREE FROM FREE FROM QC RECORD 2 - 1

FINISH DEFECTS & SLAG DEFECTS & SLAG
2.2 SURFACE PREPARATION 1.CLEANING, MA VISUAL PERIODIC IS:2629 IS:2629 QC RECORD 2 - -

PICKLING, IN EACH
RINSING & SHIFT
FLUXING
2. SURFACE MA VISUAL 100% IS-2629 IS-2629 QC RECORD 2 - -

QUALITY
2.3 GALVANISING 1.TEMPERATURE MA TEMPERATURE CONTINUOUS IS-2629 IS-2629 QC RECORD 3/2 - - If vendor doesn't have his own galvanizing plant
OF BATH INDICATOR duly approved by BHEL PEM; then galvanizing
shall be carried out at BHEL-PEM approved other
galvanizing plants as per Annexure-2.
NAME
SIGNATURE

VENDOR
SHEET 2 OF 2 SYSTEM CABLING ITEM : CABLE TRAY SUPPORT MATERIAL (WELDED TYPE) DOC. NO. :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
2. DROSS MA VISUAL PERIODIC IS - 2629 IS - 2629 QC RECORD 3/2 - -
3. RATE OF MA VISUAL 100% IS - 2629 / MFR'S IS - 2629 / MFR'S QC RECORD 3/2 - 2

IMMERSION MEASUREMENT PRACTICE PRACTICE
4. SURFACE MA VISUAL 100% IS - 2629 FREE FROM QC RECORD 3/2 - -

QUALITY BURRS
ROUGHNESS,
SLAG, FLUX,
STAIN, ETC.
3.0 FINISHED ITEMS
1.DIMENSIONS MA MEASUREMENT IS 2500 (PART 1) APP. DATA SHEET APP. DATA SHEET INSP. REPORT 2 1 -
LEVEL S-4
2. SURFACE FINISH MA VISUAL IS 2500 (PART 1) FREE FROM FREE FROM INSP. REPORT 2 1 -
LEVEL S-4 BURRS, SLAG, BURRS, SLAG,
ROUGHNESS, ROUGHNESS,
FLUX, STAIN, FLUX, STAIN,
ETC. ETC.
3.MASS OF MA CHEM. TEST IS - 4759 IS-6745 / APP. DATA SHEET INSP. REPORT 2 1 -
ZINC COATING APP. DATA SHEET
4.UNIFORMITY MA CHEM. TEST IS - 4759 IS-2633 IS-2633 INSP. REPORT 2 1 -

OF ZINC COATING
5.THICKNESS MA ELCOMETER IS - 4759 APP. DATA SHEET APP. DATA SHEET INSP. REPORT 2 1 -
OF ZINC COATING
6.ADHESION MA MECH.TEST IS-4759 IS-2629 IS-2629 INSP. REPORT 2 1 -

NAME
SIGNATURE

VENDOR
SHEET 1 OF 2 SYSTEM CABLING ITEM : CABLE TRAYS & ACCESSORIES DOC. NO. :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.0 RAW MATERIAL
1.1 ROLLED SHEET 1.CHEM.& PHY. MA VERIFICATION 100% IS1079 IS1079 MILL TC 3/2 - 1/2 Steel shall be procured from
PROPERTIES OF TC'S SAIL/TISCO/RINL/BHUSAN/JINDAL STEEL/JINDAL
ISPAT/ESSAR/LLOYD/ IISCO/ authorised SAIL
Re Rollers.
2.DIMENSIONS MA MEASUREMENT 100% IS-1730/ IS-1730/ QC RECORD 3/2 - -
APPD. DATA SHEET APPD. DATA SHEET
3.SURFACE MA VISUAL 100% IS-1079 IS-1079 QC RECORD 3/2 - -
FINISH
1.2 ZINC CHEM.COMP. MA CHEM TEST EACH HEAT IS-209 IS-209 QC RECORD 3/2 - 1/2
2.0 IN-PROCESS
2.1 FABRICATION 1.DIMENSIONS MA MEASUREMENT 100% APPD.DRG. APPD.DRG. QC RECORD 2 - 1
2.WELDING MA VISUAL 100% GOOD WELDING FREE FROM QC RECORD 2 - 1 Welding is to be done by qualified welders in
QUALITY PRACTICE DEFECTS & SLAG accordance with ASME SEC. IX article III. WPS , PQR &
WPQ to be reviewed during inspection.
3.SURFACE MA VISUAL 100% APPD.DRG. APPD.DRG. QC RECORD 2 - 1

FINISH
2.2 SURFACE PREPARATION 1.CLEANING MA VISUAL PERIODIC IS:2629 IS:2629 QC RECORD 2 - -

PICKLING & IN EACH
RINSING & SHIFT
FLUXING
2. SURFACE MA VISUAL 100% IS:2629 IS:2629 QC RECORD 2 - -

QUALITY

NAME
SIGNATURE

VENDOR
SHEET 2 OF 2 SYSTEM CABLING ITEM : CABLE TRAYS & ACCESSORIES DOC. NO. :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
2.3 GALVANISING 1.TEMPERATURE MA TEMPERATURE CONTINUOUS IS-2629 IS-2629 QC RECORD 2/3 - - If vendor doesn't have his own galvanizing plant duly
OF ZINC BATH INDICATOR approved by BHEL PEM; then galvanizing shall be
carried out at BHEL-PEM approved other galvanizing
2.DROSS MA VISUAL PERIODIC IS 2629 IS 2629 QC RECORD 2/3 - - plants as per Annexure-2.
3.RATE OF MA VISUAL 100% IS 2629/ IS2629/ QC RECORD 2/3 - 2

IMMERSION MFR'S PRACTICE MFR'S PRACTICE
4.SURFACE MA VISUAL 100% IS 2629 FREE FROM QC RECORD 2/3 - -

QUALITY BURRS
ROUGHNESS,
SLAG FLUX.
STAIN. ETC.
3.0 FINISHED ITEMS
3.1 (CABLE TRAY, ACCESSO- 1.DIMENSIONS MA MEASUREMENT IS-2500 (PART 1) APPD. DRG APPD. DRG INSP.REPORT 2 1 - Fasteners shall be of reputed make.
Overall thickness of finished product shall not be less
RIES & HARDWARES) LEVEL S-4
than the thickness of cable tray & accessories defined in
technical datasheet.
2,SURFACE FINISH MA VISUAL IS-2500 (PART 1) APPD. DRG FREE FROM INSP.REPORT 2 1 - Following shall be engraved/ punched on each standard
LEVEL S-4 BURRS, SLAG, length of cable tray at the center of both sides
ROUGHNESS, of runner:'PEM' (length of letter 90mm & height 30mm).
FLUX. STAIN.
ETC.
3.RIGIDITY MA DEFLECTION 2 No./ LOT/TYPE APPD. DRG APPD. DRG INSP.REPORT 2 1 - 600MM wide cable tray to be testsed.
(FOR TRAYS) TEST Maximum deflection shall not exceed 7MM on mid span
on uniform loading of 100KG/M.
4.MASS OF MA CHEM. TEST IS-4759 IS-6745/ APPD. DATASHEET INSP.REPORT 2 1 -
ZINC COATING APPD. DATASHEET
5.UNIFORMITY MA CHEM. TEST IS-4759 IS-2633 IS-2633 INSP.REPORT 2 1 -

OF ZINC COATING
6.THICKNESS MA ELCOMETER IS-4759 APPD. DATASHEET APPD. DATASHEET INSP.REPORT 2 1 -

OF ZINC COATING
7.ADHESION MA MECH.TEST IS-4759 IS-2629 IS-2629 INSP.REPORT 2 1 -

NAME
SIGNATURE
CUSTOMER : PROJECT SPECIFICATION :
TITLE NUMBER :
QUALITY PLAN BIDDER/ : QUALITY PLAN SPECIFICATION
VENDOR NUMBER PED-506-00-Q-006, REV-01 TITLE
SHEET 1 OF 2 SYSTEM ITEM AC ELECT. MOTORS BELOW 55KW (LV) SECTION VOLUME III
SL. COMPONENT/OPERATION CHARACTERISTICS CAT. TYPE/ EXTENT OF REFERENCE ACCEPTANCE FORMAT AGENCY REMARKS
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.0 ASSEMBLY 1.WORKMANSHIP MA VISUAL 100% MANUF'S SPEC MANUF'S SPEC -DO- 2 - -
2.DIMENSIONS MA -DO- -DO- MFG. DRG./ MFG. DRG./ -DO- 2 - -

MFG. SPEC. MFG. SPEC.
3.CORRECTNESS MA VISUAL 100% MFG.SPEC./ MFG.SPEC. -DO- 2 - -

COMPLETENESS RELEVANT IS RELEVANT IS
TERMINATIONS/
MARKING/COLOUR
CODE
2.0 PAINTING 1.SHADE MA VISUAL SAMPLE MANUFR'S BHEL SPEC. LOG BOOK 2 - -
SPEC/BHEL SAME AS
SPEC./RELEVANT COL.7
STANDARD
3.0 TESTS 1.ROUTINE MA -DO- 100% IS-325/ SAME AS TEST 2 1 NOTE -1

TEST INCLUDING BHEL SPEC./ COL.7 REPORT &
SPECIAL TEST DATA SHEET NOTE-3
AS PER BHEL
SPEC.
2.OVERALL MA MEASUREMENT 100% APPROVED APPROVED INSPN. 2 1 - NOTE -1

DIMENSIONS & & DRG/DATA DRG/DATA REPORT &
ORIENTATION VISUAL SHEET SHEET NOTE-3
& RELEVANT IS

NAME
SIGNATURE
QUALITY PLAN TITLE NUMBER :
BIDDER/ : QUALITY PLAN SPECIFICATION :
VENDOR NUMBER PED-506-00-Q-006, REV-01 TITLE :
SHEET 2 OF 2 SYSTEM ITEM AC ELECT. MOTORS BELOW 55KW (LV) SECTION VOLUME III
SL. COMPONENT/OPERATION CHARACTERISTICS CAT. TYPE/ EXTENT OF REFERENCE ACCEPTANCE FORMAT AGENCY REMARKS
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
3.NAMEPLATE MA VISUAL 100% IS-325 & IS-325 & INSPN. 2 1 -

DETAILS DATA SHEET DATA SHEET REPORT
NOTES:
1 ROUTINE TESTS ON 100% MOTORS SHALL BE DONE BY THE VENDOR. HOWEVER, BHEL SHALL WITNESS ROUTINE TESTS ON RANDOM SAMPLES. THE
SAMPLING PLAN SHALL BE MUTUALLY AGREED UPON
2 WHERE EVER CUSTOMER IS INVOLVED IN INSPECTION, (1) SHALL MEAN BHEL AND CUSTOMERS BOTH TOGETHER.
3 FOR EXHAUST/VENTILATION FAN MOTORS OF RATING UPTO 1.5KW , ONLY ROUTINE TEST CERTIFICATES SHALL BE FURNISHED FOR SCRUTINY.
Legends for Inspection agency
1. BHEL/CUSTOMER
2. VENDOR (MOTOR MANUFACTURER)
3. SUB-VENDOR (RAW MATERIAL/COMPONENTS SUPPLIER)
P. PERFORM
W. WITNESS
V. VERIFY

NAME
SIGNATURE
TITLE NUMBER :
QUALITY PLAN BIDDER/ : QUALITY PLAN SPECIFICATION :
SHEET 1 OF 9 SYSTEM ITEM: AC ELECT. MOTORS 55 KW & ABOVE (LV & MV) SECTION VOLUME III
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.0 RAW MATERIAL & BOUGHT OUT
CONTROL
1.1 SHEET STEEL, PLATES, 1.SURFACE MA VISUAL 100% - FREE FROM LOG BOOK 3 - -
SECTION, EYEBOLTS CONDITION BLINKS,
CRACKS,
WAVINESS
ETC
2.DIMENSIONS MA MEASUREMENT SAMPLE MANFR'S MANFR'S -DO- 3 - -

DRG./SPEC DRG./SPEC
3.PROOF LOAD MA MECH. TEST -DO- -DO- -DO- INSPEC. 3 - 2

TEST (EYE REPORT
BOLT)
1.2 HARDWARES 1.SURFACE MA VISUAL 100% FREE FROM -DO- 3 - -

CONDITION CRACKS, UN-
EVENNESS
ETC.
2.PROPERTY MA VISUAL SAMPLES MANFR'S RELEVENT SUPPLIERS 3 - 2 PROPERTY CLASS

CLASS DRG./SPEC IS/SPEC. TC & LOG MARKING SHALL BE
BOOK CHECKED BY THE
VENDOR
1.3 CASTING 1.SURFACE MA VISUAL 100% FREE FROM LOG BOOK 3 - 2

CONDITION CRACKS,
BLOW HOLES
ETC.
2.CHEM. & MA CHEM & MECH 1/HEAT NO. MANFR'S RELEVENT SUPPLIER'S 3 - 2 HEAT NO. SHALL BE
PHY. PROP. TEST DRG./SPEC IS/ TC VERIFIED
3.DIMENSIONS MA MEASUREMENT 100% MANUFR'S MANUFR'S LOG BOOK 3 - 2

DRG. DRG.
1.4 PAINT & VARNISH 1.MAKE, SHADE, MA VISUAL 100% MANFR'S MANFR'S LOG BOOK 3 - 2
SHELF LIFE & CONTINUOUS DRG./SPEC DRG./SPEC
TYPE

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.5 SHAFT 1. SURFACE MA VISUAL 100% - FREE FROM -DO- 3 - - VENDOR'S APPROVAL
(FORGED OR ROLLED) COND. VISUAL IDENTIFICATION SHALL BE
DEFECTS MAINTAINED
2. CHEM. & MA CHEM. & 1/HEAT NO. MFG. DRG. RELEVANT SUPPLIER'S 3 - 2
PHYSICAL PHYSICAL OR HEAT SPEC. IS TC
PROPERTIES TESTS TREATMENT
BATCH NO
3. DIMENSIONS MA MEASUREMENT 100% -DO- MANUFR'S LOG BOOK 3 - 2

DRG.
4.INTERNAL CR UT -DO- ASTM-A388 MANUFR'S -DO- 3 2 1 FOR DIA OF 55 MM &

FLAWS SPEC. ABOVE
BHEL SPEC.
1.6 SPACE HEATERS, CONNEC- 1. MAKE & MA VISUAL -DO- MANUFR'S MANUFR'S -DO- 3 - 2
TORS, TERMINAL BLOCKS, RATING DRG. SPEC. DRG. SPEC.
CABLES, CABLE LUGS,
CARBON BRUSH TEMP.
DETECTORS, RTD, BTD'S
2. PHYSICAL MA -DO- -DO- - NO PHYS. DAMAGE, -DO- 3 - 2

COND. NO ELECTRICAL
DISCONTINUITY
3.DIMENSIONS MA MEASUREMENT SAMPLE MANUFR'S MANUFR'S -DO- 3 - 2

(WHEREVER DRG./ SPEC. DRG. / SPEC.
APPLICABLE)
4.PERFORMANCE/ MA TEST 100% -DO- -DO- INSP. 3 - 2

CALIBRATION REPORT

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
1.7 OTHER INSULATING 1. SURFACE MA VISUAL 100% - NO VISUAL INSPT. 3 - 2

MATERIALS LIKE SLEEVES, COND. ETC. DEFECTS REPORT
BINDINGS CORDS, PAPERS,
PRESS BOARDS ETC.
2. OTHER
CHARACTERISTICS MA TEST SAMPLE MANUF'S MANUF'S LOG BOOK 3 - 2
SPEC. SPEC. AND OR
SUPPLIER'S
TC
1.8 SHEET STAMPING 1. SURFACE MA VISUAL 100% - NO VISUAL LOG BOOK 3 - -

(PUNCHED) COND. DEFECTS
(FREE FROM
BURS)
2.DIMENSIONS MA MEASUREMENT SAMPLE MANUFR'S MANUFR'S -DO- 3 - 2 FOR MV MOTOR INSULA-

INCLUDING BURS DRG. . DRG. TION/VARNISH THICKNESS
HEIGHT SHALL BE MORE THAN
THE BURS HEIGHT
3. ACCEPTANCE MA ELECT. & MECH -DO- MANUF'S RELEVANT SUPPLIER'S 3 - 2
TESTS TESTS SPEC./ IS TC
RELEVANT
IS
1.9 CONDUCTORS 1. SURFACE MA VISUAL 100% - FREE FROM LOG BOOK 3* - 2* * MOTOR MANUFACTURER TO
FINISH VISUAL CONDUCT VISUAL CHECK FOR
DEFECTS SURFACE FINISH ON RANDOM
BASIS (10% SAMPLE) AT HIS
WORKS AND MAINTAIN
RECORD FOR VERIFICATION
BY BHEL/CUSTOMER.
2.ELECT. PROP, & MA ELECT. & SAMPLES RELEVANT IS/ RELEVANT IS/ SUPPLIERS 3 - 2
MECH. PROP MECH.TEST BS OR BS OR TC &
OTHER OTHER VENDOR'S
STANDARDS STANDARDS INSPN.
REPORTS

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
3.DIMENSIONS MA MEASUREMENT -DO- -DO- -DO- Log Book 3 - 2
MANFR'S DRG./ MANFR'S DRG./

1.10 BEARINGS 1.MAKE & TYPE MA VISUAL 100% APPROVED APPROVED -DO- 3 - 2
DATASHEET DATASHEET
2.DIMENSIONS MA MEASUREMENT SAMPLE BHEL DATA BHEL DATA -DO- 3 - 2

SHEET SHEET BEARING
MANUF'S
CATALOGUES
3.SURFACE MA VISUAL 100% - FREE FROM -DO- 3 - 2

FINISH VISUAL
DEFECTS
1.11 SLIP RING 1.SURFACE MA VISUAL 100% - -DO- -DO- 3 - -

(WHEREVER APPLICABLE) COND.
2.DIMENSIONS MA MEASUREMENT SAMPLE MANUF'S MANUF'S -DO- 3 - -

DRG DRG
3.TEMP.WITH- MA ELECT.TEST -DO- MANUF'S MANUF'S -DO- 3 - 2

SPEC./ BHEL
STAND CAPACITY SPEC./ BHEL SPEC.
SPEC.
4.HV/IR MA -DO- 100% -DO- -DO- -DO- 3 - 2
1.12 OIL SEALS & GASKETS 1.MATERIAL OF MA VISUAL 100% MANUF'S MANUF'S -DO- 3 - -
GASKET DRG/SPECS DRG./ SPECS.
2.SURFACE MA VISUAL 100% - FREE FROM -DO- 3 - -

COND. VISUAL
DEFECTS
3.DIMENSIONS MA MEASUREMENT SAMPLE MANUF'S MANUF'S -DO- 3 - -

DRG DRG

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
2.0 IN PROCESS
2.1 STATOR FRAME WELDING 1.WORKMANSHIP MA VISUAL 100% -DO- GOOD FINISH LOG BOOK 3/2 2 -
(IN CASE OF FABRICATED & CLEANNESS
STATOR )
2.DIMENSIONS MA MEASUREMENT -DO- MANUF'S MANUF'S -DO- 2 - -

DRG DRG
2.2 MACHINING 1.FINISH MA VISUAL 100% -DO- GOOD FINISH LOG BOOK 2 - -
2.DIMENSIONS MA MEASUREMENT -DO- MANUF'S MANUF'S -DO- 2 - -

DRG DRG
3.SHAFT SURFACE MA PT -DO- RELEVENT MANUFR'S -DO- 2 - 1

FLOWS SPEC./ SPEC./
ASTM-E165 BHEL SPEC./
2.3 PAINTING 1.SURFACE MA VISUAL 100% MANFR'S BHEL LOG BOOK 2 - -

PREPARATION SPEC/BHEL SPEC.
SPEC./ SAME AS
RELEVANT COL.7
STAND
2.PAINT THICKNESS MA MEASUREMENT SAMPLE -DO- -DO- -DO- 2 - -

(BOTH PRIMER & BY ELCOMETER
FINISH COAT)
3.SHADE MA VISUAL -DO- -DO- -DO- Log Book 2 - -
4.ADHESION MA CROSS -DO- -DO- -DO- Log Book 2 - -

CUTTING &
TAPE TEST

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
2.4 SHEET STACKING 1.COMPLETENESS MA MEASUREMENT SAMPLE MANUFR'S MANUFR'S Log Book 2 - -
SPEC. SPEC.
2.COMPRESSION MA MEASUREMENT 100% -DO- -DO- Log Book 2 - -

& TIGHTENING
3.CORE LOSS & MA ELECT.TEST -DO- -DO- -DO- Log Book 2 1* 1 (FOR MOTORS OF 2MW AND
HOTSPOT ABOVE)
* ON 10% RANDOM SAMPLE
2.5 WINDING 1.COMPLETENESS CR VISUAL 100% MANUFR'S MANUFR'S Log Book 2 - -
SPEC./BHEL SPEC./BHEL
SPEC. SPEC.
2.CLEANLINESS CR -DO- -DO- -DO- -DO- Log Book 2 - -
3.IR-HV-IR CR ELECT. TEST -DO- -DO- -DO- Log Book 2 - 1
4.RESISTANCE CR -DO- -DO- -DO- -DO- Log Book 2 - 1
5.INTERTURN CR -DO- -DO- -DO- -DO- Log Book 2 - -

INSULATION
6.SURGE WITH CR -DO- -DO- -DO- -DO- Log Book 2 - 1 FOR MV MOTOR
STAND AND
TAN. DELTA
TEST
2.6 IMPREGNATION 1.VISCOSCITY MA PHY. TEST AT STARTING -DO- -DO- Log Book 2 - -
2.TEMP. MA PROCESS CONTINUOUS -DO- -DO- Log Book 2 - -

PRESSURE CHECK
VACCUM
3.NO. OF DIPS MA -DO- -DO- -DO- -DO- Log Book 2 - 1 THREE DIPS TO BE
GIVEN

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
4.DURATION MA -DO- -DO- -DO- -DO- Log Book 2 - 1
2.7 COMPLETE STATOR 1.COMPACTNESS MA VISUAL 100% -DO- -DO- Log Book 2 - -
ASSEMBLY & CLEANLINESS
2.8 BRAZING/COMPRESSION 1.COMPLETENESS CR -DO- -DO- -DO- -DO- Log Book 2 - -

JOINT
2.SOUNDNESS CR MALLET TEST -DO- -DO- -DO- Log Book 2 1
& UT
3.HV MA ELECT. TEST -DO- -DO- -DO- Log Book 2 1
2.9 COMPLETE ROTOR 1.RESIDUAL CR DYN. BALANCE -DO- MFG SPEC./ MFG. DWG. Log Book 2 1 VERIFICATION FOR MV
ASSEMBLY UNBALANCE ISO 1940 MOTOR ONLY
2.SOUNDNESS CR ELECT. -DO- MFG. SPEC. MFG. SPEC. Log Book 2 1

OF DIE (GROWLER
CASTING TEST)
2.10 ASSEMBLY 1.ALIGNMENT MA MEAS. -DO- -DO- -DO- Log Book 2 - -
2.WORKMANSHIP MA VISUAL -DO- -DO- -DO- Log Book 2 - -
3.AXIAL PLAY MA MEAS. -DO- -DO- -DO- Log Book 2 - 1
4.DIMENSIONS MA -DO- -DO- MFG.DRG./ MFG. DRG/ Log Book 2 - -

MFG SPEC. RELEVANT IS
5.CORRECTNESS, MA VISUAL 100% MFG SPEC. MFG SPEC. Log Book 2 - -

COMPLETENESS RELEVANT IS RELEVANT IS
TERMINATIONS/
MARKING/
COLOUR CODE
6. RTD, BTD & SPACE MA VISUAL 100% MFG SPEC. MFG SPEC. Log Book 2 1
HEATER MOUNTING. RELEVANT IS RELEVANT IS

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
3.0 TESTS 1.TYPE TESTS MA ELECT.TEST 1/TYPE/SIZE IS-325/ IS-325/ TEST 2 1* 1 * NOTE - 1
INCLUDING BHEL SPEC./ BHEL SPEC./ REPORT
SPECIAL DATA SHEET DATA SHEET
TESTS AS PER
BHEL SPEC.
$
2.ROUTINE MA -DO- 100% -DO- -DO- -DO- 2 1$ 1 NOTE - 2
TESTS INCLUDING
SPECIAL TEST
AS PER BHEL
SPEC.
$
3.VIBRATION & MA -DO- 100% IS-12075 & IS-12075 & -DO- 2 1$ 1 NOTE - 2
NOISE LEVEL IS-12065 IS-12065
4.OVERALL MA MEASUREMENT 100% APPROVED APPROVED INSPC. 2 1 -

DIMENSIONS & VISUAL DRG/DATA DRG/DATA REPORT
AND ORIENTATION SHEET SHEET &
RELEVANT IS
5.DEGREE OF MA ELECT. & 1/TYPE/ RELEVANT IS BHEL SPEC. TC 2 - 1 TC FROM AN INDEPENDENT

PROTECTION MECH. TEST SIZE AND DATA LABORATORY, REFER NOTE-3
SHEET
$
6. MEASUREMENT OF MA -DO- 100% -DO- -DO- -DO- 2 1$ 1 NOTE - 2
RESISTANCE OF RTD
& BTD
$
7. MEASUREMENT OF MA -DO- 100% -DO- -DO- -DO- 2 1$ 1 NOTE - 2
RESISTANCE, IR OF
SPACE HEATER
$
8. NAMEPLATE MA VISUAL 100% IS-325 & IS-325 & INSPC. 2 1$ 1 NOTE - 2
DETAILS DATA SHEET DATA SHEET REPORT
9.EXPLOSION MA EXPLOSION 1/TYPE IS-3682 IS-3682 TC 2 - 1 TC FROM AN INDEPENDENT

FLAME PROOF FLAME PROOF IS-8239 IS-8239 LABORATORY, REFER NOTE-3
NESS (IF TEST IS-8240 IS-8240
SPECIFIED)
10. PAINT SHADE, MA VISUAL & SAMPLE BHEL SPEC. BHEL SPEC. TC 2 1$ 1 SAMPLING PLAN TO BE
THICKNESS MEASUREMENT & DATA & DATA DECIDED BY INSPECTION
& FINISH BY ELKOMETER SHEET SHEET AGENCY
$
NOTE - 2

NAME
SIGNATURE
TITLE NUMBER :
CHECK P W V
1 2 3 4 5 6 7 8 9 10 11
NOTES:
1 DEPENDING UPON THE SIZE AND CRITICALLY, WITNESSING BY BHEL SHALL BE DECIDED.
2 ROUTINE TESTS ON 100% MOTORS SHALL BE DONE BY THE VENDOR. HOWEVER, BHEL SHALL WITNESS ROUTINE TESTS ON RANDOM SAMPLES.
THE SAMPLING PLAN SHALL BE MUTUALLY AGREED UPON.
3 IN CASE TEST CERTIFICATES FOR THESE TESTS ON SIMILAR TYPE, SIZE AND DESIGN OF MOTOR FROM INDEPENDENT LABORATORY ARE AVAILABLE,
THESE TEST MAY NOT BE REPEATED.
4 WHEREVER CUSTOMER IS INVOLVED IN INSPECTION, AGENCY (1) SHALL MEAN BHEL AND CUSTOMERS BOTH TOGETHER.
Legends for Inspection agency
1. BHEL/CUSTOMER
2. VENDOR (MOTOR MANUFACTURER)
3. SUB-VENDOR (RAW MATERIAL/COMPONENTS SUPPLIER)
P. PERFORM
W. WITNESS
V. VERIFY

NAME
SIGNATURE
Telangana State Power Generation Corporation Ltd EPC Bid Document
1x800 MW Kothagudem TPS e-PCT/TS/K/02/2014-15
VOLUME : VII-D
TECHNICAL SPECIFICATION
FOR
NATURAL DRAFT COOLING TOWER
1.00.00 INTENT OF SPECIFICATION
1.01.00 This specification is intended to cover supply and installation of One (1) no. of
Natural Draft Cooling Tower (NDCT) as detailed hereinafter for 1 x 800 MW
Kothagudem Thermal Power Station (KTPS), Stage-VII, Unit-12 for Andhra
Pradesh Power Generation Corporation Ltd. (APGENCO) at Kothagudem,
Andhra Pradesh.
1.02.00 The scope shall include design, engineering, construction of natural draft
reinforced concrete hyperbolic cooling tower including all manufacture,
assembly/ pre-assembly, tests at manufacturer's works, shop painting,
seaworthy packing, complete with all accessories, auxiliaries as specified
hereinafter and as required for safe and trouble free continuous commercial
operation.
1.03.00 The scope of this specification also includes but not limited to
erection/installation, supervision, including unloading, storage and handling at
site, site testing, commissioning, trial run, performance and guarantee tests,
training of operating personnel, O&M of the plant till commencement of
commercial operation and other erection services to ensure trouble free
operation and commissioning of the plant
1.04.00 It is not intended to specify completely herein, all details of design and
construction of equipments. However, the equipment shall conform in all
respects to high standards of engineering, design and workmanship and be
capable of performing in continuous commercial operation up to the vendor’s
guarantee in a manner acceptable to the purchaser, who will interpret the
meaning of drawings and specifications and shall be entitled to reject any
work of material which in his judgment is not in full accordance therewith.
1.05.00 The provisions of this technical specification are general in nature and cover
broad aspects. Technical specification outlines the minimum requirements.
However, it would be absolute responsibility of the bidder to collect, interpret,
analyze all necessary information / data for the successful design and
construction of the cooling tower. Structural safety and successful operation
of the tower shall be the total responsibility of the bidder notwithstanding the
approval of the owner.
DEVELOPMENT CONSULTANTS VII-D : 1

(PCA.CD-005.e-PCT-TS-K-02-2014-15-VII-D_KTPS.DOC)
2.00.00 CODES AND STANDARDS
2.01.00 The design, construction, manufacture, performance, testing and

commissioning of the cooling tower as specified hereinafter shall comply with
the requirements of all applicable latest Indian/British/American Standards
and Codes of Practice. The latest editions of the following standards and
publications shall be followed in particular:
2.01.01 BS 4485 Water Cooling Tower (Part 1 thru’ 4)
2.01.02 Cooling Tower Institute of USA, Bulletin ATC-105: "Acceptance Test

Procedure for Water Cooling Tower."
2.01.03 PTC-23: ASME Performance Test Code for Atmospheric Water Cooling
Equipment.
2.01.04 IS: 11504: Criteria for Structural Design of Reinforced Concrete Natural
Draught Cooling Towers.
2.01.05 American Society of Testing Materials
2.02.00 The materials of various components such as PVC, plain and reinforced
concrete, bars and steel wires for concrete reinforcement etc. shall be in
accordance with relevant Indian Standards or else to applicable American
Standards.
2.03.00 In case of any contradiction between the aforesaid Standards and stipulations
as per this technical specification as specified hereinafter, the stipulations of
this technical specification shall prevail.
Also, in case of any contradiction between this technical specification and

stipulations of the enclosed "Data Specification Sheets", the stipulations of
the Data Specification Sheets will prevail.
3.00.00 GENERAL PERFORMANCE REQUIREMENTS
3.01.00 The cooling tower shall be designed for continuous operation to cool not less
than the design flow of water from specified inlet temperature to outlet
temperature at a design ambient wet bulb temperature and other design
parameters as enumerated in the enclosed Natural Draught Cooling Tower
Data Specification Sheets.
3.02.00 The cooling tower shall be designed for continuous operation throughout the
year, unless specially stated otherwise in Data Specification Sheet. The
guaranteed performance (cold water temperature) shall be achieved at all
wind velocities as specified.

3.03.00 The cooling tower shall also give satisfactory performance while handling the
specified water during monsoon months, with the range as indicated in Data
Specification Sheet.
3.04.00 For arriving at the air properties such as enthalpy, density etc., no correction
for altitude shall be considered. All properties shall be taken from the data
provided on CTI or BS code corresponding to sea level.
3.05.00 Bidder shall also furnish the following in support of tower design and
performance, along with the bid without which the offer is liable for rejection.
3.05.01 Heat balance calculations.
3.05.02 Justification for the outlet air temperature. This could be in the form of
operating experience on existing towers or laboratory test on actual fill shape,
material and configuration as offered. In the case of laboratory test, Bidder
shall indicate correction / scaling factor applied to predict performance of full
size tower under field conditions.
3.05.03 Calculations to show the adequacy of tower height to provide the required
Draught.
3.05.04 Calculations for tower duty coefficient and performance coefficient.
3.05.05 Sketch showing fill arrangement which should clearly indicate the total depth,
horizontal and vertical spacing.
3.06.00 Drift loss of the cooling tower expressed in % of rated capacity shall be limited
to as close to zero as possible.
3.07.00 The Bidder shall assume full responsibility in proper design and operating of
each and every component of the complete cooling tower as well as the
cooling tower as a whole.
4.00.00 SYSTEM DESCRIPTION
4.01.00 The natural draught cooling tower will be located inside the plant boundary
and will be used for cooling the hot circulating water returning from the
condenser and various other heat exchangers. The circulation of water will be
maintained by Circulating Water (CW) Pumps and Auxiliary Cooling Water
(ACW) pumps located inside C.W. pump house.
4.02.00 The hot circulating water reaching the cooling tower will be raised to the top of
the hot water distribution system of the tower. The hot water distribution pipes
inside the Tower shall be fitted with spray nozzles to distribute the hot water
evenly over the PVC fill located immediately below. The hot water cools by
evaporation as it drains through the PVC fill into the cooling tower basin.

4.03.00 The cooled water will be collected in a circular basin located under the cooling
tower. The basin shall have a central partition, such that any half of the basin
can be cleaned/ repaired while the other half is in use.
4.04.00 Water from the cold water basins will flow through RCC channel to the sump
of the C.W. pump house.
4.05.00 The supplier should preferably be in a position to take up maintenance/

overhauling work as and when desired by the Owner during whole life of
operation of the plant, on service contract and/or piecemeal basis.
5.00.00 DUTY AND CAPACITY
5.01.00 Cooling tower shall be capable of cooling the total quantity of hot condensate
circulating water and auxiliary cooling water, through the specified 'Range' at
the design wet bulb temperature and other parameters as per Data sheet.
This cooling shall be possible even with the maximum or calm wind
conditions. The Cooling tower shall be designed for continuous operation
throughout the year.
5.02.00 The basin wall curb level shall be minimum 500 mm above the finished grade
floor. The grade level surrounding the cooling tower shall provide for effective
storm water drainage away from the tower. Depth of basin from well top shall
be suitable for 6 minute storage of rated capacity excluding free board of 300
mm and not less than minimum one (1) metre. Basin slope towards cooling
sump shall be 1 in 120.
5.03.00 The bidder shall review the analysis of water in circulation. All materials and
components furnished under this specification shall be suitable for continuous
and reliable operation of the tower with the water in circulation. Special care
must be taken to select and use materials and components, which will not
corrode, leach or be subject to organic and inorganic deposits or destructive
action leading to subsequent failure or erosion by water droplets or be source
of electrolytic corrosion being set-up between components. Any materials or
components, found inadequate for the service during the first 12 months, after
commissioning will have to be replaced at site with suitable material of
construction in all towers without any additional cost to the Owner at a time
when unit is under shut down.
5.04.00 Re-cooled water from tower basin will be conveyed through a concrete
channel to the circulating water sump for recirculation. Hot water will be
delivered to the tower through distributing headers. Re-cooled water from
tower shall be thoroughly mixed to ensure temperature equalization prior to
entering the channel leading to the pumps.

6.00.00 SCOPE OF SUPPLY AND WORKS
The following Equipment shall be supplied under this specification.
6.01.00 General
 Thermal, mechanical and structural design of cooling tower including

all appurtenant civil works.
 Drift eliminators
 Supply at site of all materials and equipment required for construction.
 Construction of cooling tower including all work and services

connected herewith.
 Construction of cold water basin, cold water outlet channel/ duct and
basin de-sludge arrangement.
 Hot water distribution piping/ducting along with spray nozzle system.
 Supply, shop testing of components and erection of all mechanical

equipment, PVC fill, Spray nozzles, etc.
 Complete lightning protection system, aviation obstruction lighting

system, earthing including the necessary power distribution
arrangement as per technical specification for “Electrical Equipment
and Accessories, Vol.V-A & Vol.V-B”.
6.02.00 Detailed Scope of Civil Works
 Excavation and backfilling for columns foundation and substructure

below cold water basin level.
 R.C. foundation raft & Cold water Basin, R.C. Shell, R.C. support
framework for fill support.
 Hot water distribution duct.
Painting of concrete surfaces shall be as per Cl. 9.09.00 of volume -

VII D.
 Providing and installation of access doors in the shell of cooling tower
including the necessary fittings and appliances on Tower Shell. The
access doors shall be of heavy duty MS doors duly painted with 3
coats of epoxy paints.

 Main access RC staircase outside the tower up to Hot water Duct top,
internal RC walkways and platforms all with necessary galvanized MS
pipe handrails.
 Cold water channel outlet into gravity tunnel.
 De-sludging arrangement for each compartment of cold water basin.
 Provision of permanent access ladder up to top of tower

manufactured in galvanized mild steel with adequate back-guards and
landing platforms. The ladder shall comply with all applicable
regulations.
 Provision of peripheral drainage around cooling tower as per Cl.

9.11.00 of volume - VII D
 Necessary site clearing and grading all round the tower in accordance
with specifications and drawings.
 Water fill test of cold water basin, cold water outlet channel and
tunnel.
 Hydro test of Hot water Duct.
 Supply and erection of all base plates, foundation plates, anchor

bolts, sleeves, nuts, fasteners, embedded parts and any other
likewise material required for all electrical and mechanical equipment
and accessories to complete the work.
 Rock anchors will not be considered for foundations in any case.
 Preparation and supply of all working drawings required for the work:
 Piling, excavation, dewatering, shoring and shuttering, backfilling

around under ground structures and disposal of surplus soil outside
the plant boundary / to the designated dump yard.
 Any other works not mentioned herein, but sufficiently implied and are
necessary for completion and proper functioning of the cooling tower.
6.03.00 Detailed scope of Mechanical works
 Hot water distributions spray system of reliable & efficient design,

along with its supporting arrangement.
 Hot water duct/pipe work along with supports and anchors.

 Gear operated with chain pulley arrangement isolation valves on hot

water inlet piping before hot water distribution system to achieve
basin maintenance.
 Painting both inside and outside surfaces of steel pipes with three
coats of rust and corrosion resisting paint including thorough cleaning
of the surfaces.
 Tower PVC fill, drift eliminators including all required supporting

structure and accessories, etc. as necessary.
 Screens along with guides embedded in concrete at each of the cold

water outlet channels from the cold water basin.
 Sluice gate with mechanical jack arrangement and guides in each of

the cold water outlet channel connection from the cold water basin.
 Manually operated chain pulley blocks, together with the monorails

and supporting frames for the handling of screen and gates.
 Cold water outlet duct/tunnel.
 Knife-edge gate valve/sluice valve in each de-sludge connection and

also De-sludge piping up to the disposal point at local storm water
drain channels.
 Tower Fill Hot water By-Pass Nozzle connections on Hot water duct/
piping for system lines flushing during commissioning.
 Instrument tapping provisions on hot water duct/piping and cold water

duct/piping for carrying out flow and temperature measurement during
PG test.
6.04.00 Detailed Scope of Electrical Works
Refer Volume V-B, Section-XV, Technical Specification for Chimney and

Natural Draft Cooling Tower- Electrical works.
6.05.00 Any additional equipment, material, services which are not specifically
mentioned here, but are required to make the plant/systems in the scope of
the Bidder complete in every respect in accordance with the technical
specification and for safe operation and guaranteed performance, shall be
deemed to be covered under the scope of this specification.
6.06.00 All accessories and hardwares.
6.07.00 One set of special tools and tackles.

6.08.00 All relevant drawings, data and O&M manuals.
6.09.00 The scope of this specification also includes erection, installation, site testing,
commissioning, trial run, performance and guarantee tests, training of
operating personnel, O&M of the plant till commencement of commercial
operation and other erection services to ensure trouble free operation and
commissioning of the Equipment/System.
7.00.00 DESIGN AND CONSTRUCTION
7.01.00 Hot Water Distribution System
7.01.01 The distribution system shall be designed for flexible and satisfactory
operation at all reasonable loads.
7.01.02 The hot water distribution shall be suitable for handling an additional 20% flow
over the design circulating water flow. The hot water distribution shall be done
by two headers, each covering half of cooling tower area so that it can be
operated at 50% capacity.
7.01.03 The hot water distribution piping and valves shall be designed for a working
pressure as calculated by the Bidder.
7.01.04 The spray system can be either upward or downward maintaining water spray
even with shutdown flows.
7.01.05 The sprayers shall be arranged in a uniform pattern with proper distance to
produce 10% to 20% overlapping of the individual sprays. This arrangement
shall provide extremely even water distribution with uniformly sized droplets
entering the fill. The spray overlapping required avoiding dry pockets in the fill
due to variations expected in water head availability in main hot water duct.
7.01.06 The spray nozzle shall be reliable and effective in breaking the hot water jet
into a spray pattern of uniformly sized droplets. It should be proven and tested
design to provide maintenance free service for minimum 3 years.
7.01.07 The fixing arrangement of spray nozzles to hot water distribution header shall
be of flanged joint type. Screwed joint shall be avoided as they are likely to
get loosened due to flow induced vibrations.
7.01.08 The distribution of water shall be in Ducts / troughs of approved material.

The entire water distribution system shall be self-draining and non-clogging
type.
7.01.09 The distribution troughs/pipes shall be independently supported from the

structures and shall be easily removable. Provision shall also be made for
easy flushing or cleaning of all troughs / pipes.

7.01.10 The structural design of the water distribution system shall also consider the
following loadings, combined as appropriate.
a) Self weight.
b) Hydraulic pressure during normal operations, including pressure

surges.
c) Hydraulic pressures due to mal-operation of tower or supply pumps.
7.01.11 Seismic loading on the water distribution system shall also be considered.
7.01.12 The water distribution system shall be provided with adequate pressure surge
relief facilities to prevent pressure loadings in excess of values used in the
design. If such facilities are not provided, a further increase in loading shall be
considered in the design. The pressure level to be considered shall not be
less than 1.5 times the design pressure.
7.01.13 The design of water distribution system and its supports shall be capable of
accommodating all thermal stresses and movements due to changes in inlet
water temperature, outlet water temperature and ambient temperature.
7.01.14 If open basin system of distribution is provided, the basin shall be provided
with removable type covers made of pre-cast concrete.
7.01.15 Splash boxes in cross flow tower shall be provided at the discharge of each
distribution valve to minimize splashing and to facilitate even distribution of
water.
7.01.16 The nozzles shall be spaced to give even distribution of water over the entire
space occupied by top row of fills.
7.01.17 The nozzles and splash plates shall be made of High Density Polyethylene or
approved equal.
7.01.18 The pipes & valves etc. used shall be designed and arranged to take care of
the possible thermal stress due to temperature variation. The pipes & fittings
shall have extra heavy thickness.
7.01.19 Ready accessibility to the different parts like isolation valves etc. shall be
provided and as required necessary platform/walkway and ladder shall be
provided for this purpose.

7.02.00 Louver and Casing
7.02.01 Louvers shall be designed for air entry to the tower with low velocity for
minimum pressure drop and less chance of recirculation of moist air. To
eliminate splash out, louvers shall slope to shed water inwards.
7.02.02 The louvers and casing may be made of concrete. Concrete casing wall shall
be supported from the basin through reinforced concrete. Hinged access
door with platforms shall be provided for entry into the tower at suitable
locations.
7.03.00 Fill
7.03.01 Cooling tower fill shall be made PVC, V-bar type of approved make.
7.03.02 Minimum weight of fill should be 100 Kg/sqm.
7.03.03 The Bidder shall enclose with his proposal a write-up on the method of
replacement of damaged/deteriorated fills during the life of cooling tower.
Also Bidder's experience with pre-stressed concrete fills shall be clearly
furnished in proposal. Bidder shall also indicate whether these are to be
manufactured at shop or at site.
7.03.04 The PVC fill if offered shall be durable and fire retardant quality. The Bidder
shall furnish details of PVC fill along with his offer indicating fire retardant
properties, ageing effect, vibration caused by water and wind effects.
Frequency of replacement of PVC fills and the method of such replacement
shall also be mentioned with above details. The PVC fills shall be of proven
quality and the make and its properties shall be subject to Purchaser's
approval. The Bidder shall furnish with his proposal, a sample of the fill
material to be used for the specified cooling tower.
7.03.05 Design and facing of the fills shall be such as to expose high air/water surface
with minimum air pressure drop. Air velocity through the fills shall be uniform.
7.04.00 Fill Supports
7.04.01 Splash bar type fills shall be supported on the grids at frequent intervals,
preferably not exceeding 450 mm, to minimize sag, possibility of
dislodgement, and damage to fill materials as a consequence of induced
vibration in the fill.
7.04.02 For film type filling, the sheet like fills consisting of multiple vertical surfaces
shall be tied with filling support bars by stainless steel or nylon wires.
Suitable spacers shall be used to maintain verticality of the sheets.
7.04.03 The fill and the support system shall be sufficiently strong to withstand the

water loading when the flow path is 30% chocked.
7.05.00 Drift Eliminators
7.05.01 Zig-Zag path type Multi pass Drift eliminators (minimum two pass) shall be
provided so as to limit the drift loss to that specified earlier or as in the Data
Specification Sheet.
7.05.02 In case the tower is provided with pre-stressed concrete or PVC fill, drift
eliminators may be made up of PVC.
7.05.03 The eliminator frame shall be of rugged construction and shall be firmly
secured to arrest vibration.
7.06.00 Access
7.06.01 Staircases shall be provided external to the cooling tower along with
stairways, landings, walkways, handrails and access doors. Minimum 2 Nos.
staircase 1000 mm wide and minimum landing width of 1000 mm at locations
as necessary to give safe and convenient access to the top and the interior
parts of the tower.
7.06.02 Suitable arrangement for supporting walkways inside the cooling tower shall
be made and such arrangement shall be independent of the fill material.
7.06.03 Whether specifically mentioned in the Data Specification Sheet or not, steel
components and fittings used in walkways, handrails shall be hot dip
galvanized after fabrication.
7.07.00 Cooling Tower Basin & Outlet Sumps
7.07.01 The hot water distribution basin and cold water outlet channel of the cooling
towers shall be designed by considering a minimum of 10% margin over the
design cooling tower flow.
7.07.02 Cooling tower basin, shall be supplied/constructed along with all civil parts,
base plates, anchor bolts, nuts, and other accessories, pipe sleeves, inserts,
etc. and as required to complete the work in all respects.
7.07.03 The work shall include excavation/back-filling as necessary, all concrete/steel

work, cold water outlet sump & sludge pit for each basin, water-proofing and
all other works.
7.07.04 The basin shall be partitioned into two individual chambers such that one
section can be taken out for maintenance /de-sludging while the other section
is in operation.
7.07.05 Sludge pit with isolating valves, and spool pipe shall be provided for individual

basin chambers for connection to drainage pipe.
7.07.06 For each basin chamber, there shall be a cold water outlet sump. In the
connection between basin chamber and cold water sump there shall be
screen and sluice gate/Butterfly valve.
7.07.07 Each basin chamber shall have overflow arrangement at sludge pit end.
7.07.08 Basin slope towards cooling sump shall be 1 in 120.
7.08.00 Screens & Isolating Devices in Cold Water Outlet Sumps, Valves and
Pipes in Sludge Pits and Accessories
7.08.01 Screens shall be out of 8 gauge 25 mm clear opening SS wire netting welded
to frame of structural steel section/flats. Framework shall be hot dip
galvanized and provided with primer and bituminous painting. Two numbers
of screens shall be supplied per tower. Lifting lugs or eye bolts shall be
provided on top of the screen frame for ease of handling.
7.08.02 For handling screens, one set of monorail with supporting structure and chain
pulley hoist complete with lifting chain and push type trolley for mounting the
hoist shall be furnished, if asked for in the Data Specification Sheets. The
chain pulley hoist shall be manually operated and shall conform to IS: 3832,
Class-2.
7.08.03 Sluice gates or Butterfly valves in cold water outlet sumps shall be provided
as mentioned in Data Specification Sheet. Sluice gates shall be as per
appropriate class of IS: 3042. Butterfly valves shall conform to AWWA C-504
(latest revision).
All mild steel parts shall be galvanized or painted with epoxy enamel primer &
paint. The sluice gate may be rectangular or circular as per preference of the
Bidder.
The sluice gates/Butterfly valves shall be complete with head-stock for

manual operation. The head-stock shall have pillar, base plate and hand
wheel made up of cast iron. The head-stock shall have rising/non-rising
spindle with position indicator.
7.08.04 The flow area through each gate/valve and screen shall be such as to
maintain a flow velocity through them within 1.2 M/sec during the rated flow
from cooling tower, with the minimum water level in the cold water basin.
7.08.05 The isolating valves in sludge pits shall conform to appropriate class of IS:
780. Each valve shall be complete with pedestal type manual operator, with
rising/non-rising spindle and valve position indicator.
7.08.06 The pipe spools, to be embedded in sludge pit for piping connection, shall be

C.I. pipe as per IS: 1536, Class-LA, unless otherwise mentioned elsewhere.
7.09.00 Hardware
All nails and fastening bolts, nuts & washers used in the cooling tower
stainless steel, if not specified in the Data Specification Sheet.
8.00.00 CIVIL AND ALLIED WORKS
8.01.00 The civil design and construction of the cooling tower shall be in accordance
with the following technical specifications and the Data Specification Sheets
enclosed with this specification –
a) Earthwork in Excavation and Backfilling.
b) Cement Concrete (Plain and Reinforced).
c) Masonry and Allied work.
d) Finish to Masonry and Concrete.
e) Metal doors, windows, ventilators, louvers etc.
f) Roof water proofing, insulation and allied work.
g) Painting, white washing, polishing etc.
h) Sheet work in roof and siding.
8.02.00 The technical specifications are of general nature. Only those portions of the
specifications which relate to the various works required to be done as per the
technical requirements as specified in the tender document need to be
considered.
8.03.00 The Cooling Tower shell, ring beams, diagonal columns at base supporting
the ring beam below shell, cold water basin, fill support frame work, hot water
distribution duct, cold water channel, louver etc. shall be cast-in-situ RCC
construction.
9.00.00 CIVIL DESIGN BASIS
9.01.00 Loading
The following loads shall be considered for the design of cooling towers:
a) Dead loads

b) Wind loads
c) Earthquake forces
d) Loads due to temperature and shrinkage effects. Temperature effects

due to solar radiation shall also be considered.
e) Construction load
f) Foundation settlement etc.
g) Any other load likely to come on cooling tower.
9.01.01 Dead Load
For assessing the self weight of the structure, the specific weight of the
concrete shall be taken as 2500 kg/m3. All other dead loads shall be
assessed in accordance with relevant codal provision. Dead load shall include
the self weight of structure, weight of fill material, weight due to
plugging/chocking of fills, weight of falling water, weight of hot water pipe,
weight of water in hot water channel and distribution system including the self
weight of channel and distribution system, weight of drift eliminators etc.
Secondary stresses, if any, due to permanent fixtures on the shell shall also
be considered. In addition, live load on the supporting structure due to
maintenance activities related to fills /ducts/distribution system shall be
considered.
9.01.02 Wind Load
The wind pressure on the tower shall be assessed on theoretical basis as well
as with the help of Model tests in a wind tunnel of turbulent boundary layer.
All the theoretical methods outlined hereunder for estimating wind load on
cooling tower shell shall be valid only if the towers spaced at clear distance of
greater than 0.5 times the base diameter at the finished graded ground level.
The theoretical method outlined herein forms the basis only for assessing
lowest limit of wind forces and shell structure interaction.
For conducting model tests, bidders should survey the whole terrain and
make their own assessment of likely critical wind forces & wind structure
interaction. It would be the responsibility of the contractor to collect necessary
meteorological data duly vetted from the recognized govt.
agencies/institutions. After collection of necessary meteorological data, most
critical wind speed, wind pressure distribution and other necessary parameter
shall be determined by the bidder and get the same vetted by the above
agency/appropriate agency(s). Then with the help of physical model tests in a

wind tunnel, offering appropriate aerodynamic similitude, the contractor shall

obtain the most critical forces, stresses etc. with cooling tower at various
levels and locations. Such model test shall also include all adjacent
topographical features, buildings, and other structures which are likely to
influence the wind load pattern on the tower significantly. The model test shall
be carried out in a well reputed institute/testing laboratory after obtaining prior
approval from the Owner. The testing agency selected by the contractor shall
have requisite experience and should have successfully carried out tests in
the past for at least one cooling tower of similar capacity. The model tests
shall be duly witnessed and approved by the Owner/consultant. The model
test results shall be made available before final approval of the design.
The complete cooling tower shall be designed for all possible wind directions
and on the basis of worst load conditions as obtained from Model test and
theoretical methods. Under the theoretical method, the circumferential net
wind pressure distribution and wind pressure coefficient (p1) for the tower
shell (without meridional ribs) shall be obtained from the “Criteria for structural
design of Reinforced concrete Nature Draft Cooling Towers IS: 11504-1985.
The above circumferential wind pressure coefficient (p1) shall be increased

by multiplying it by 1.43 to account for turbulence in the incident wind and
load intensification due to turbulence induced by the adjacent cooling tower or
the other structures of significant dimensions. Therefore, the actual design
circumferential net wind pressure coefficient (p) shall be computed as
p=1.43(p1), where (p1) is the wind pressure coefficient as per IS: 11504-
1985.Enhancement factor 1.43 is considered to take the interference effect of
adjacent structures of significant dimensions into account.10% increment
shall be considered for imperfection in construction as per IS:11504.This
factor shall be increased further by 10% during foundation design in absence
of model test results. If the model is for C/L of shell, wind load shall be
appropriately augmented to cater to the increase in diameter of the
shell(O.D).
This design net pressure coefficient (p) and the distribution along the
circumference of tower shall be used at all heights of the tower. The above
design net pressure coefficient (p) shall include the effect of internal suction.
In order to compute the quasi-static design wind pressure at a given height

along the circumference of the tower, the net design pressure coefficient (p)
shall be multiplied by the wind pressure acting at that height [P(z)]. For
details, reference shall be made to “Criteria for Wind Resistant Design of
Structures and Equipments” and as given below.
The wind pressure at a given height [P(z)] shall be computed as per the
stipulations of IS: 875 (Part 3)-1987. For computing the design wind pressure
at a given height the basic wind speed (Vb) shall be taken as Vb=50m/sec at
10.0 meters height above mean ground level. For computing design wind

speed (Vz) at a height z, the risk co-efficient K1=1.08 shall be considered. For
coefficient K2, Terrain category 4 and class ‘C’ as per table 2 of IS: 875 (Part-
3) – 1987 (Latest) shall be considered. Coefficient K3 shall be determined by
taking into account nearby plant site and other features of the station &
topography. The wind direction for design purposes shall be the one which
would induce the worst load conditions. However, coefficient K3 shall not be
less than one under any circumstances. The wind pressure at a given height
shall be computed theoretically in accordance to the IS Codal position given
as under:
Pz = 0.6 Vz2 N/m2
The bidder shall also compute the wind pressure (pz) along the wind direction
by Gust Factor (GF) or Gust effective factor method (GEF). Method for
estimating the wind load on the tower and other elements, shall be based on
IS: 875 (Part-3)-1987. While calculating the gust factor, the term ‘b’ shall be
taken as the diameter of the throat in Fig. 10 of IS: 875 (Part-3)-1987.
Design of the tower shall satisfy quasi-static method & GEF method. Dynamic
effects on the tower due to wind action shall also be investigated to ascertain
the wind induced oscillation such as ovalling and excitation along and across
the wind direction. Bidder shall carry out detailed analysis for the tower and
consider the worst combination of static & dynamic effects.
In case the bidder proposes to adopt aerodynamic rough surface such as

provision of meridional ribs in the cooling tower shell, the pressure
coefficients as given in the VGB-BTR KUHLTUMRE GERMAN
SPECIFICATIONS (latest) (structural design of cooling towers) shall be
permitted. The provisions of BTR may be adopted for choosing the value of
circumferential wind pressure coefficient (p1) only. The wind pressure
coefficient (p1), as obtained from BTR after accounting for internal suction
shall be multiplied by a factor of 1.43 to arrive at the net design pressure
coefficient (p). The bidder shall furnish authorized English Translation of
VGB-BTR KUHLTURME GERMAN SPECIFICATIONS (latest) for the review
of the Owner. All other stipulations as specified in these specifications shall
be met with.
Entire analysis and designs adopted shall be fully supported with

authenticated literatures/documents along with relevant references where the
same has been successfully implemented.

9.01.03 Earthquake Forces
The seismic analysis shall be carried out in accordance with IS:1893 (all
latest parts) by modal analysis for the hyperbolic cooling towers or any other
method as approved by the Owner. The earthquake analysis of the shell and
its support columns including the foundations shall be carried out by response
spectrum method. For the fill supporting structures (RCC frames) response
spectrum method is permitted. The modulus of elasticity for concrete shall be
obtained from IS: 456-2000 Clause 6.2.3.1 with an Age Factor of 1.0. All the
analysis shall be carried out as per the theory of elasticity.

authenticated literatures/documents along with relevant reference where the
same has been successfully implemented.
9.01.04 Loads due to temperature effects
Stresses due to temperature effects :
The cooling tower shell shall be designed for stress due to axi-symmetric
temperature distribution corresponding to external ambient temperature
variation from 12.0oC to 50oC. However, the detailed analysis of actual
thermal gradient by considering temperatures inside the tower and external
ambient temperatures shall be carried out furnishing detailed references and
justification for the same.
The shell shall also be checked for thermal stresses arising due to partial
operation of the tower in case the operational philosophy so demands. The
analysis for the stresses resulting from non-axi-symmetric temperature
loading shall be carried out. In such non-symmetric temperature loading, the
calculation shall be based upon the operating specification. Besides, the shell
shall also be designed for one sided solar radiation effect. Nevertheless an
effective temperature difference of at least 250 C across the shell thickness
constant over the height and follow a sine functions along half the
circumference shall be considered.

authenticated literatures / documents along with relevant references where
the same has been successfully implemented.
9.01.05 Construction Loadings
The method of construction and the type of formwork to be used shall be

decided by the bidder in advance and should be enclosed in the bids
submitted. Construction loadings that may occur during execution of work
shall be considered in the design of the cooling tower structure. Factors

causing temporary loading may include the following depending upon the
method of construction.
a) Barrowing of concrete
b) Scaffolding and formwork
c) Loads produced by anchoring devices of climbing scaffolds.
d) Hoist fixings
e) Storage of materials on scaffolding
f) Temporary access
g) Tower crane fixings
h) Works temporarily omitted for access purposes.
Any other load such as foundation settlement, etc.
All loads likely to act on cooling tower but not specified herein shall also be
considered for the design of cooling tower structures.
In case different degrees of subsoil stiffness exist, effect of the same shall be
taken into account. In such a case, for computing settlements, load
distributing capacity of the shell may be considered. Differential settlement
between adjacent sections of foundation shall be considered under most
unfavourable load combination.
9.01.06 Load Combinations
Following minimum load combinations shall be considered for the design of

cooling towers structures.
a) DL + WL + SL
b) DL + Se L
c) DL + TL
d) DL + WL + TL + SL
e) DL + Se L + TL + SL
f) 1.0 DL + 1.5 WL
g) 0.9 DL +1.5 WL

h) 0.9 DL-1.5WL
Where,
DL = Dead Load
WL = Wind Load
SL = Settlement Load
Se L = Seismic Load
TL = Thermal Load
In addition to above, construction loads shall be duly accounted for. Under TL

various types of thermal loads, as described above, shall be considered
separately. Besides above load combination, other load combinations as per
relevant IS codes shall also be followed.
9.01.07 Permissible Stresses
For load combination (a) to (e) working stress method shall be done without
considering 33% increase in permissible stresses in concrete and
reinforcement.
For the load case (f) to (h) the shell of cooling towers shall be checked by limit
state method as per IS: 456. The stress in the reinforcement steel shall not
exceed 87% of the specific characteristic strength of reinforcement steel and
the compressive stress in the concrete shall not exceed 45% of the specified
28 days cube strength of the concrete as per IS: 456.
In the design of the cooling tower shell, column, pile caps, pedestals, ring
beams etc. no increase in the strength with the age of the concrete shall be
permitted.
Permissible stress for steel structures shall be as per IS: 800 based on
working stresses.
9.02.00 Tower Design Consideration
9.02.01 General
 The complete cooling tower, including the shell, columns, ring beam
and foundation, shall be structurally analyzed using a proven finite
element modeling technique or an approved alternative method
including validation of software used for analysis. For elastic analysis,
concrete may be assumed to be un-cracked, homogenous and
isotropic. The design geometric profile, thickness variation and
support conditions of shell shall be considered in the structural
analysis.

 Analysis based on a recognized bending theory of the elastic shells

shall be adopted for the design of the tower and supporting
structures.
Regardless of analysis method adopted, the equilibrium checks of

internal forces and external loads shall be performed.
 Geometric imperfections, if exceed the permissible limit, then the

analysis of shell shall take into account of such imperfections and
resubmitted for Owner’s approval.
 Boundary conditions shall be realistic and based on actual

configuration. The magnitude of the calculated displacements should
be within limits of the applied theory.
 A detailed dynamic analysis shall be carried out for complete tower for
seismic forces by response spectrum method. Cooling tower shall
also be designed for cross wind oscillations (wind induced vibration) if
the fundamental natural frequency of the tower is less than or equal to
1 Hz. Frequency calculation for free vibration analysis shall also be
furnished by bidder during detailed engineering.
9.02.02 Size and Shape
 The base diameter, air intake opening height, tower height and throat
diameter shall be determined by thermal design consideration by the
contractor and submitted to Owner for approval.
 As the range of possible hyperbolic shell shapes is infinite, the same

shall generally conform to the following major proportions, which have
been extensively adopted in cooling tower constructions.
H/D = 1.2 to 1.55
Where H is the total tower height above basin sill level
Hb/H = 0.75 to 0.85
Hb is the vertical distance from the throat to basin sill level and ‘D’ is
the base diameter at basin sill level.
 However, other proven profiles may be permitted subject to approval

from the Owner. Bidders shall submit along with the offer complete
details of the profile, in case the profile is not within the limits stated
above, and the names of the sites where such shell profiles have
been successfully constructed. Notwithstanding what is stated above,
the Owner reserves the right to accept / reject the shell profile.

9.02.03 Tower Shell Boundary Conditions
A. Shell Analysis and Design
The following boundary conditions shall be assumed for the design of cooling
tower shell :
a) At Upper Edge
The top edge of the shell shall be gradually thickened to form a ring
beam to guard against possible instability of the top of the shell due to
high velocity wind gusts. Top edge shall be considered as a free edge
in the analysis.
b) At Lower Edge
The lower edge of the shell shall be thickened to form a lower ring
beam. The thickness transition from shell to lower ring beam shall be
smooth and shall be considered as an integral part of the shell. The
lower boundary of the shell shall be considered as elastically
supported by discrete columns.
The influence of both support structure flexibility and foundation settlement

shall be considered in the analysis and design of cooling tower shell. The
shell analysis should include following information at 10o plan angle and of not
more than 0.05 of the shell height.
i) Meridional and circumferential direct stress resultants and the

tangential shear stress resultants.
ii) Meridional and circumferential bending moments.
iii) Displacements normal to the shell mid-surface.
B. Buckling of Tower Shells
 Critical dynamic pressure (wind pressure) at buckling shall be

calculated from BS: 4485 Part-4:1996.
 Buckling of Cooling Tower shell be checked as per Finite Element

Analysis using software such as NISA 2, Ansys etc. The factor of
safety for snap through buckling shall be more than 5. This requires
non linear analysis including simulation of opening in the model.
Alternatively, bifurcation buckling factor can be calculated using linear
eigen value analysis with modulus of elasticity E=0.8Ec, to account
for cracked section, with factor of safety more than 7.

 Besides above, a buckling analysis with wind forces should be made

using the theoretical tower geometry and boundary conditions,
including the influence of dead weight, by the method of buckling
stress state (BSS) approach in accordance with the provisions of
VGB/BS 4485.
 The buckling safety factor shall be at least 5.0 for load combinations
of dead load + wind load.
 When imperfections in the shell geometry are larger than specified

tolerances, the analysis should be rechecked to account for such
imperfections and ensure that the desired buckling capacity remains.
C. Opening in Shells
 Opening through the shells should be avoided as far as possible.

They should be of smallest required dimensions and shall be shaped
such that stress concentration is minimized at the boundary of the
opening. Should thickening of the edges be necessary, it shall be
smoothly tempered back to the shell thickness.
 Openings shall be provided with additional edge reinforcement of a

minimum cross sectional area at each edge equal to 75% of the
reinforcement intercepted by the openings in the direction parallel to
the edges. In addition diagonal reinforcement shall be provided at
each corner as close as possible. The total cross-sectional area in
cm2 of this reinforcement shall be 0.5d, at each corner where‘d’ is the
shell thickness in cm.
 No horizontal thrust due to the inlet piping shall be transmitted to the

shell.
D. Minimum Thickness of Shell
The thickness of the shell shall not be minimum 300 mm or more as per
design.
E. Minimum Reinforcement in Shell Spacing and Placement
 The reinforcement used shall be cold worked steel high strength

deformed bars of grade Fe 415/500 conforming to IS: 1786 – latest.
All reinforcement steel shall be corrosion resistant steel/HCRM. The
minimum reinforcement to be provided shall be as follows:
 Top one third portion of shell: 0.4% of concrete cross-sectional area

along circumferential direction and 0.35% of concrete cross sectional
area along meridional direction.

 Remaining two-third portion: 0.35% of concrete cross-sectional area

in both meridional and circumferential directions.
 Minimum bar diameter shall be 10 mm in transverse direction and 12

mm in meridional direction.
 Spacing of reinforcing bars should not exceed 200 mm in

circumferential direction and 250 mm in meridional direction.
 The two layers of reinforcing meshes shall be adequately joined by S-

hook over the total shell surface. At least two S-hooks in each square
metre area of shell surface shall be provided. The hooks shall be of
minimum 8 mm diameter bars.
 The concrete cover shall be 50 mm minimum. However, the clear

cover shall not be less than 1.5 times diameter of bars. The relevant
provisions of IS: 2210 – Criteria for the design of reinforced concrete
shell structures and folded plates and IS: 2204 – Code of Practice for
construction of reinforced concrete shell roof shall also be deemed to
be applicable. All other design criteria for the cooling tower shell
which are not specified above shall be in accordance with BS: 4485
Part 4 and BTR.
F. Provision of meridional ribs in Cooling Tower Shell
Meridional ribs in the cooling tower shell may be provided subject to the
following conditions:
a) Minimum thickness of shell excluding ribs shall not be less than 300
mm.
b) Coefficients for pressure distribution around the cooling tower

circumference including suction may be taken as per VGB-BTR
KUCHLTURMEN SPECIFICATIONS (latest). All other factors
including load intensification factors shall be as specified elsewhere in
these specifications.
c) Shell buckling and strength shall be checked as per clause-9.02.03 B

above without considering the effect of ribs.
d) All other stipulations as specified in these specifications shall be met

with.
e) Bidder shall furnish an authorized English translation of the VGB-BTR

KUCHLTURMEN GERMAN SPECIFICATIONS (Latest) during
detailed engineering stage.

9.02.04 Raker Columns
Inclination of the column shall closely match the meridional slope at the shell
so that the load transfer to foundation takes place through predominantly axial
force in columns. Raker columns shall be designed for the most critical forces
transferred to an individual raker column from superstructure considering
various load combinations as specified in this document.
For selecting effective length of the raker columns, following restraints shall
be considered:
a) In case columns restrained at both the ends, the effective length shall
be 0.8 and 0.6 times the length of the column radially and tangentially
respectively.
b) In case columns are restrained at one end only, the effective length of
columns shall be 0.9 and 0.7 times the length of columns radially and
tangentially respectively.
c) The columns shall be designed based on working stress method

except for the forces from DL + 1.5 WL which shall be designed as
per limit state of strength method of IS: 456.
d) The minimum size of raker column section shall be 1200 mm

diameter or more as per design
e) The size of pedestals shall be such that it will have minimum 200 mm
clear projection from the raker column.
9.02.05 Crack Width Control
Under working stress method the maximum crack width of tower shell, lintels,
raker columns, cold water basin and fill support structure shall be controlled
up to 0.1 mm on basis of formulas as per IS:456-2000 and relevant British
codes.
Fill support structures and Drift Eliminators shall be designed as per the load
combinations specified in this document. Appropriate Live Loads and
imposed loads shall also be considered in addition. The design shall confirm
to limit state method as per IS: 456. For fill support structure, the design shall
be done considering the weight of fills, falling water, plugging/scaling load and
the live load due to the maintenance activities.

9.02.06 Pre-stressed Concrete Members
Design, construction and workmanship of pre-stressed concrete, members

shall be in accordance with IS: 1343 (Latest revision). Steel wire for pre-
stressing shall conform to IS: 1785 (Part 1) (latest edition) or IS: 6003 (latest
edition). Crack width control shall be limited to 0.1 mm.
Particular attention shall be paid to achieve an effective bond of the wires in

pre-tensioned concrete units. For this purpose, indented wire shall be used.
Wires shall be corrosive resistant. Concrete and grout used shall be sulphate
resistant.
The bidder shall furnish a write-up for the method to be used for pre-stressed
concrete structures.
9.02.07 Liquid Retaining Structures
a) The cold water basin including sludge pits, cold water channels, shall
be designed as per IS: 456 (latest) with crack width control of 0.1 mm
for outer face of the wall and inside face of the wall shall be designed
as per IS 3370.
The structures shall be designed for the following conditions:
i) Water filled inside up to maximum level and no earth outside.
ii) Earth pressure with surcharge load of 2.5 t/m2, as applicable,

and with/without ground water table at 1.0m below finished
ground level outside and no water inside.
b) The basin and associated structures shall be checked against uplift

for basin empty condition. Stability shall be checked during
construction stage as well as maintenance stage. The factor of safety
shall be as per IS: 3370.
c) Loads during construction, erection and maintenance stage shall also

be considered.
d) Temperature fluctuations from operation shall be obtained from the

design data. Hot water temperature inside and cold air temperature
outside shall be considered.
e) Basin floor slab shall be designed to rest on piles or raft/mat

foundation including fill-pack support structures. The stiffness of the
subsoil shall be taken into account. The founding level of the raft/mat
shall be either on virgin ground level or shall be placed at higher level
only after scooping out filled up soil up to virgin ground and then filling

back with well compacted sand (80% of relative density) up to the

founding level of the raft/mat. The bidder shall ascertain the safe
bearing capacity of the stratum at the founding level and may adopt
the same subject to Owner’s approval.
f) Minimum thickness of basin slab shall be 300 mm with minimum

reinforcement 0.35% of gross sectional area in both the directions.
Reinforcement shall be placed in two layers, top and bottom surface.
The effect of provision of flap valves/pressure release valves shall not
be considered in the design of CW basin. In the space underneath the
basin floor slab a layer of at least 100 mm thick PCC of mix 1:3:6 shall
be provided.
g) All reinforcements used shall be corrosion resistant steel/HCRM.
h) The basin floor shall be cast in alternate bays in chequered pattern

with sides not exceeding 4.5 meter
i) No pressure relieve valve to be used at basin floor.
9.02.08 Water Distribution System
The structural design of the water distribution system shall consider the worst
combination of following loads :
a) Self weight, other imposed loads and live load.
b) Hydraulic pressures during normal operations including pressure

surges.
c) Hydraulic pressure due to mal-operation of the tower or supply

pumps.
 The water distribution system shall be provided with adequate

pressure surge relief facilities to prevent pressure loading in
excess of values used in the design. If such facilities are not
provided, a further increase in loading shall be considered in
the design. For the structural design the pressure level to be
considered shall not be less than 1.5 times the design
pressure.
 The design of water distribution system and its supports shall

be capable of accommodating all thermal stresses and
movements due to changes in inlet water temperature and
ambient temperature.

 The possibility of vibrations being imposed on the distribution

system shall be investigated in the design. Seismic loading on
the water distribution system shall also be taken into account.
 The design shall be carried out based on uncracked section as

per IS: 3370 under normal operating conditions. Strength
check for worst loading including malfunctioning shall be
carried out with stress limitations as per IS: 3370. The
construction shall be completely water tight without the use of
fillets, sealing compounds etc. The method of construction
shall be such so as to avoid excessive rise in temperature of
concrete due to release of heat of hydration.
 Hot water distribution basin/trough/channel at top shall be

covered by removable precast concrete slab to prevent direct
exposure from sunlight. Corners of pre-cast concrete slabs
shall be protected by angles. Lifting lugs shall also be
provided for handling of concrete slabs.
 Basin channel wall shall be designed for a minimum surcharge

load of 25 KN/Sqm. Paving shall be provided all round cold
water basin.
9.02.09 Platforms, Walkways, Stairways, Staircases, Internal Grillage etc.
These shall be designed as per working stress method IS: 456-2000 and IS:
800. The crack width in all RCC structures shall be limited to 0.1 mm. A
minimum live load of 500 kq/sqm shall be considered for the design of all
platforms, walkways, staircases etc. in addition to their own weight.
Platforms shall be minimum 1.2 M wide and walkways shall have 1.5 M wide.
9.02.10 Steel Structures
All structural steel members shall conform to IS: 2062 (GR-A). These
structures shall be designed, fabricated and erected as per IS: 800 and other
relevant Indian Standard codes for structural steel work. All steel structures
shall be coated with anticorrosive system.
9.02.11 Slide Gates and Screens
Slide Gates and Screens, as per IS: 5620 conforming to IS: 2062 Gr. A, shall
be designed for worst combination of operating and maintenance condition.
All steel components shall be coated with anti-corrosive paint system.
However, all guides of slide gates and screens shall be of stainless steel of
Grade AISI 316L.

9.03.00 Foundations
Data specification sheet and Soil Report (By EPC Contractor) shall be
referred to for selecting allowable bearing pressure to be considered in
designing the foundation and in selecting depth of foundation. Cooling tower
foundation is to be designed as strip foundation considering appropriate
modulus of subgrade reaction. However, the bidder has to select suitable
type of foundation compatible with the soil strata and calculated settlement of
structure and foundation system. The bidder shall have to furnish conceptual
design indicating type of foundation, general arrangement drawing for super
structure, basin, pipe supports, pits, founding level etc. including settlement
criteria complete with a design basis report with the offer.
The design of the cooling tower foundation structures shall be based on IS:
456 as per working stress method for worst load combination as per clause
9.01.06 In case of load combination DL + 1.5 WL, the limit state method as
per IS: 456 shall be adopted.
Foundation shall be checked for safety against overturning, sliding and uplift.
The minimum factors of safety for overturning, sliding and hydrostatic uplift
shall be 1.5, 1.5 and 1.25 respectively.
While checking stability of the structures, neglect favourably acting loads from
water fill, soil cover beyond the edge of the foundation. Ground water table
shall be considered at 1.0m below Plant Finished Grade Level for design of
foundations and all underground structures.
Minimum grade of concrete shall be M25 for foundation resting over 100mm
thick PCC (1:3:6 ) layer. Clear cover shall not be less than 50mm.
Pile foundation if adopted shall be designed in accordance with IS: 2911(Part-

I / Sec-I, II and III).
Generally net tension should be avoided in the foundations/piles for the shell
support foundation unless specifically permitted by the Owner.
While accounting for over burden of the soil for checking the foundation
against up-lift, dead weight of the soil directly above the pile cap or ring raft,
as the case may be, shall only be considered, neglecting the weight of soil in
the cone of up-lift above the foundation.
The foundation structures will be subjected to following loading and extreme

load combination case shall be considered for design.
1. Most critical forces transferred from superstructure for the various

load combinations.
2. Uplift forces

3. Loading due to foundation settlement
4. Concentrated local loading from column nodes
5. Thermally induced local loading where supply culverts pass through

the foundation structures without structural isolation.
6. Surcharge of 2.5 t/sq.m.
CW basin surcharge load shall also be considered in addition to the other

relevant loads for the design.
9.04.00 Fill Support Structures and Other Structures
The self weight of the pack support structures shall be based on the weight of
the packing including weight of standing, running and dripping water, other
operation and plugging/chocking (debris/scaling) loads, etc. in accordance
with manufacturer’s data. In addition, a live load of 100 kg/m2 shall also be
considered for the design of supporting structures.
For other structures like walkways, platforms, etc. a live load of 500 kg/sq.m
shall be considered. Hand railings shall be designed for horizontal load of 60
kg/m2.
Wind deflector walls and any other structural elements shall be designed for a
horizontal wind load of 80 kq/sqm or as per manufacturer’s recommendations,
whichever is higher. Thermal loading shall be as per manufacturer’s
recommendations. Earthquake loading shall be considered based on criteria
given for cooling tower. Response spectrum analysis shall be considered.
Design of RCC members shall be based on IS: 456:2000 with limiting crack
width of 0.1 mm.
The cold water basin slab/raft shall form the common foundation for the pack
support structures. The foundation shall be designed for the most critical
forces transferred from CW basin & fill supporting structures including loads
introduced by constructional equipments and crane deployed for fill
supporting structure or shell erection.
9.05.00 Requirements for Concrete and Reinforcement
All concrete work for the cooling tower shall comply with the requirements
given in technical specification for Cement Concrete (Plain & reinforced)

Ordinary Portland cement Grade 53 complying with IS:12269 shall be used in

concrete works for all structures and foundations. For PCC, paving and plinth
protection works, OPC Grade 43 shall be used.
Fine and coarse aggregate to be used in cement shall comply with IS-383.
Structural concrete shall be of design mix complying with the relevant

provisions of IS codes or any International Code of Practice as approved by
the Owner.
Durability of the concrete shall conform to severe exposure category as per

Table 3 of IS: 456 except noted specifically otherwise.
Plain mild steel reinforcing bar shall conform to IS: 432 grade I quality and
high yield strength deform bars (TMT) shall conform to IS: 1786 (Fe-500).
All reinforcements used in RCC structure shall be corrosion resistant. Column

reinforcing bars shall be carefully anchored in the shell and foundation. The
anchoring length shall not be less than 80 times the diameter of the bars.
All foundations structures shall be provided on all sides with a minimum

reinforcement of 0.12% of gross cross-sectional area distributed over top and
bottom faces.
The minimum grade of concrete of structural components of cooling towers

shall be as follows in accordance with IS: 456.
a) Shell and Raker Columns : M-30 grade
b) Pre-cast pre-stressed elements : M-30 grade
c) All other RCC concrete : M-30 grade
d) PCC encasement concrete except piles : M-25 grade
e) Piles (with OPC/PPC/PFC) : M-30 grade
f) Tower foundation : M-30 grade
g) Mud mat/lean concrete PCC : M-10 grade
Coarse and fine aggregates shall be specially selected to ensure that they are
not susceptible to alkali/chloride attack or prone to disintegration at high
temperatures. In particular limestone aggregates shall never be used. The
maximum size of coarse aggregate shall not be larger than 1/8th narrowest
dimension between reinforcement bars not more than 20 mm.

Washing and screening of coarse and fine aggregates to remove fines, dirt or
other deleterious materials shall be carried out by approved means as
directed by the Engineer-in-charge.
The water cement ratio by weight shall be 0.45 maximum including free
moisture in the aggregates, and slump should be suitably decided to provide
good quality concrete work.
9.06.00 Admixtures
Admixtures may be permitted to be used in accordance with relevant IS codes

to modify the rate of hardening or setting, to improve workability or as an aid
to control concrete quality and protection to reinforcement bars against
corrosion. The Owner reserves the right to direct the contractor to conduct
laboratory tests or use test data, or other satisfactory reference before
granting approval. The cost of all tests conducted shall be borne by the
contractor. The admixture shall be used in strict accordance with the
manufacturer’s directions and/or as directed by the Owner. No extra payment
will be made to the contractor on account of using admixtures.
Particular attention must be given to concrete placement because of the thin

wall section and the presence of reinforcing steel. Consolidation of concrete
shall be by vibration. Removal of air and water at the form surface shall be by
vibration and rodding. Particular attention shall be paid to accurately shape
the corners at all openings.
Point of discharge of the concrete in to the forms be 1500 mm max. above the
concrete surface. Concrete shall be deposited in approximately level layers
not greater than 400 mm deep unless permitted otherwise.
Concrete in the cooling tower shell in each lift shall be so laid that the no. of
vertical or inclined construction joints are minimized to the extent possible.
Horizontal construction joints shall be maintained at uniform spacing
throughout the height of the cooling tower as per the directions of the Owner.
Special attention shall be paid to proper curing of vertical faces of the cooling
tower shell so that these do not remain dry. All thin walled structural members
shall be protected by means of curing agents. It is recommended to use a
curing agent for the cooling tower shell providing additional protection like a
single transparent cooling with a material based on vinyl mixed polymer.
Inside face of the shell should be protected by a second pigmented coating of
the same base material. Any other method of curing, if permitted by the
Owner may be used.
Sampling and testing of concrete shall be carried out as stated in Technical

Specification elsewhere and as per relevant Indian Standard Codes.
However, following minimum tests shall be carried out, irrespective of
whatever stated otherwise:

Test of compressive strength
Columns – 1 Set of 3 cubes per column
Shell-2 sets of 3 cubes per climbing section
9.07.00 Cover to Reinforcement
Unless indicated otherwise the clear concrete cover for reinforcement shall be
as per IS Codes.
The correct cover shall be maintained by cement mortar spacers/cubes or

other approved means, reinforcement for footing/pile caps, grade beam, and
slabs on sub-grade shall be supported on pre-cast concrete cover block as
approved by Engineer-in-charge. The use of pebbles or stones as cover
blocks shall not be permitted.
The 28 days crushing strength of cement mortar cubes/pre-cast concrete

cover blocks shall be at least equal to the specified strength of concrete in
which the cubes / blocks are embedded.
The minimum clear distance between reinforcing bars shall be in accordance

with IS:456 (latest edition) or as specified elsewhere in this specification.
All lapping of reinforcement bars in the cooling tower shell shall be by lapping
as per relevant codal provisions. Prior approval of the Owner shall be taken
for deciding the method of lapping the reinforcement bars in the shell.
9.08.00 Checking of shell geometry
The form work for shell shall be capable of adjusting to shell profile and
thickness accurately, and rigidly braced to prevent deflection or movement
during concreting.
The form work shall be rigid, shape preserving , tight fitting and easy to
construct so as to ensure smooth concrete surfaces, no geometrical
discontinuities and achieve a high degree of dimensional accuracy.
Check for absolute positions may be carried out from ground stations
arranged at not more than 10 degree plan angle apart. Readings of horizontal
radius shall be taken at every lift.
The shell shall be constructed within the dimensional tolerances as stipulated

in clause 7.3 of IS: 11504. If the permissible dimensional tolerance are
exceeded, the Owner will instruct the contractor, in writing, to stop
construction of the shell. The Contractor shall then examine the situation and

submit a report to the Owner who may require the contractor to demonstrate
by calculations that the structural integrity of the shell will not be impaired as a
result of the imperfections. The calculations shall be submitted to the Owner,
for approval, before construction will be permitted to proceed.
If in the opinion of the Owner the calculations show that the integrity of the
shell could be threatened, the Contractor will be required to submit to the
Owner detailed arrangement and supporting calculations to set right the shell
geometry for approval, before construction will be permitted to proceed.
The cost of carrying out the calculation, any remedial work required and idle
time or any delays to the construction programme as a result of dimensional
tolerances being exceeded will be borne by the contractor.
Adjustment to the tower shell line on the basis of the survey results shall be
made gradually; limiting the maximum change of direction from the existing
vertical shell profile to be not more than an angular change of 10 mm
measured over 1m of height. Any such adjustment shall be made with full
knowledge and consent of the Owner.
The contractor shall carry out an as-built-survey of each lift of the shell. The
results of these checks will be recorded on a suitably developed drawing of
the shell from which it will be possible to locate the survey check point. A
copy of these results will be presented to the Owner prior to commencing the
next shell pour.
The contractor’s shell construction procedures shall include for providing the
Owner with the facilities and a reasonable time period as may be required to
carry out an independent check of the completed works.
Suitable communication system such as telephone, wireless equipments, etc.

shall be provided by the contractor so that the communications are possible
at different elevations of the tower from the ground during construction.
All piling work shall be carried out by specialist subcontractor approved by the
Owner. Initial pile load test shall be carried out for at least 3 sets of piles for
direct compression and lateral load.
Since the effective action of the piles will depend on the adopted method of
construction, the contractor shall guarantee that the piles, as constructed by
the sub-contractor, shall effectively transmit the maximum loads which can be
imposed on the foundation soil and corresponding maximum deflections.
9.09.00 General Requirements
a) The basin slab shall be divided into two equal parts by a partition wall
designed to withstand full hydrostatic pressure, with one side empty.
The basin construction joints shall be made watertight by injection of

chemical grout through nipples. The basin construction shall be tested

for water tightness, in accordance with IS: 3370 (Part I) (Latest
edition). The cost of the test and any rectification and re-test if
required is deemed to be included in the contractor’s quoted price.
Any cost of filling and emptying of the basin and to rectify defects
shall also be borne by the contractor.
b) PVC water stops shall be provided at all construction/ expansion

joints of water retaining structures. 230 mm (min) wide and 10 mm
(min) thick approved quality PVC water stop with central bulb shall be
used where expansion joints are envisaged.
c) The basin floor of each compartment shall be provided with a slope of

not less than 1 in 120 towards sump for dewatering. From sump, the
water will be drained by C.I. drain pipe, embedded below the basin
floor, into a drain chamber outside the tower basin or as per the
arrangements described elsewhere in the tender document. Suitable
sluice gates (rising spindle type) conforming to IS: 3042 or sluice
valves shall be provided in the drain chamber or any other
arrangement specified elsewhere in the tender document. Suitable
operating platform with access ladders for operating the gates or
valves and pipes, shall be provided in the drain box.
d) A 250 mm high sill shall separate the pond floor from the tower outlet.
e) Uniform surface on the top of basin floor shall be provided. In case

undulated surface is observed, a top of layer of minimum 25 mm thick
1.3 mix mortar to be provided to achieve uniform surface.
f) Fill will be of film type supported on RCC beam. Film fill should be
characterized by reduced air pressure losses, and shall not
susceptible to clogging. Design and facing of the film fill shall be such
as to expose high air/water surface with minimum air pressure drop.
g) The sluice gates shall be structural steel with anti-corrosive coating

specified elsewhere. Number of sluice gates and removable screen
shall be two (2) per tower. Proper rubber seal shall be provided so as
to avoid any leakage of water. The rubber seal provided for the sluice
gates be tested in accordance with the relevant Indian Standard
Code. Sluice gates shall be checked for water tightness and smooth
operation in dry and wet conditions. Suitable facilities, as approved by
the Owner, shall be provided for handling of sluice gates and screens.
h) Lean concrete below foundations, cold water basin, other liquid

retaining structures and all underground structures, unless noted
otherwise shall be at least 100 mm thick.
i) The R.C.C. structure of the Cooling Tower shall be painted on the

exterior surface with two (2) coats of water proof cement paint of
approved make and colour .
The interior surface of the Cooling Tower structure and the interior
face of the Cooling Tower Basin, fill supporting beams, columns and
bracings, raker columns etc. which are in contact with water /
moisture shall be painted with one coat of primer and two coats water
proof bituminous paint conforming to IS:3384 and IS:9862
respectively.
j) Unless noted otherwise all concrete surface which are in contact with
the earth shall be applied with anticorrosive coat system.
k) Water proofing and plasticizer admixtures conforming to relevant IS

codes may be added as per manufacturer’s instruction to the concrete
subject to approval of the Owner.
l) The tower shall be provided with two numbers external RC staircase,

leading to a heavy duty door giving access to the distribution system.
Staircase shall be minimum 1000 mm wide (clear), with landings of
minimum width of 1000 mm at not more than 2500 mm height
intervals unless approved otherwise. The stair shall have risers not
exceeding 125 mm and treads 250 mm minimum. Anti-skid nosing at
each step shall be provided.
m) Minimum size of all doors shall be 2100 mm high (clear) and 1200
mm wide (clear). The door shall be of steel with anti-corrosive coating
of polyurethane as specified elsewhere. However, FRP material or
equivalent may also be used subject to approval of the Owner. The
door shall be air tight when closed.
n) The hand railing on both sides of the staircase shall be galvanized

with three rails of 32 mm NB pipes conforming to medium class as per
IS:1239, and posts conforming to medium class as per IS:1239 of 32
mm dia galvanized pipes spaced not more than 1.2 m centers. The
top hand rail shall be at 1000 mm above the steps with an
intermediate member at 550 mm height. The posts and runners shall
be welded construction with round corners. Complete hand rail shall
be applied with anticorrosive coating system as specified elsewhere.
All galvanization works shall have 610 gm/sqm of deposit.
o) Approved walkways and platforms shall be provided inside the tower

at distribution pipe level. These walkways and platforms shall provide
safe and clear access to all sprayers and all distribution pipes. The
clear width of walkway shall be 1.5m and clear head room shall not
be less than 2 m. Radial gaps of 12 mm wide shall be provided at
intervals in the walkways for discontinuity.

A reinforced concrete platform of 1500 mm clear width shall be

provided around the tower valves. Other walkways shall be at least
600 mm wide with 50 mm (minimum) safety kerbs along each edge.
Access ways shall be clear of all obstructions such as distribution
pipe support beams, drift eliminator support beams etc. The walkways
shall be provided with transverse slots or other opening which will
permit the free passage of air and water.
p) Hot double dip galvanized handrails as described above shall be

provided on all sides where there is a risk of falling through the fill.
q) Reinforced concrete platforms 1.2 m clear width all around the tower
circumference shall be provided on the tower for fixing of aviation
warning light at levels specified elsewhere. 12 mm wide radial gaps
shall be provided in the platform at suitable intervals for discontinuity.
Adequate MS embedment shall be provided in each side of platform
to facilitate maintenance of tower shell.
Two (2) diametrically opposite galvanized MS caged ladders, 600 mm

wide, made out of 6 mm, x 10 mm flats for full height of the tower shall
be provided as per IS: 3696.
r) MS rung ladders shall be hot dip galvanized ladder shall be 600 mm

wide fabricated out of 60 mm x 10 mm flats with 20 mm dia. rungs at
300 mm centers. Stays shall be provided at every 2.25 m intervals
connecting the ladder with the concrete shell. Upto throat level these
ladders shall be on the exterior surface of the cooling tower and shall
be continued along the inside surface of the tower up to the top of the
tower.
Galvanised MS Safety cage shall be provided for all ladders and shall
be fabricated out of 5 nos. verticals of 50 mm x 6 mm flats with 50 mm
x 6 mm flat straps at 800mm centers.
A RCC landing of size not less than 750 mm x 1500 mm, with
galvanized handrails and galvanized steel door to be provided at the
throat for interchange. Intermediate landings of reinforced concrete of
size not less than 750 mm x 1500 mm shall be provided at every 8 to
10 m height of the ladder.
Some of these landing levels shall be suitably adjusted to give access

to aviation warning beacons for maintenance. Handrails as described
above shall be provided on all platforms. The ladder leading to the top
platform shall have approach from ground via the RCC staircase.

s) In order to provide approach for maintenance of shell (inside & outside

faces), all platforms shall have 20 mm wide radial openings in the
platform floor at locations approved by Owner. Adequate numbers of
75 mm internal diameter puddle flanged C.I. pipes shall be embedded
in this platform for passing ropes during maintenance of tower shell.
t) All exposed structural steel work used in cooling towers shall be hot
double dip galvanized unless it is coated with a separate anti-
corrosive coating system. The minimum coating shall be 610 gm/sq.m
and shall comply with relevant IS codes. Galvanizing shall be
checked and tested in accordance with IS: 2629.Galvanization shall
be followed by the application of an etching primer and anticorrosive
hibuild epoxy coating system of DFT 260 microns. All welding shall be
done before galvanizing. Any site joints required to be carried out
after galvanizing shall be either flanged or screwed joints. Nails, nuts,
bolts and all components coming in direct contact with water shall be
of stainless steel of AISI 304 or equivalent.
u) Mix proportion in Cement-sand mortar for brick masonry work shall be

1:6 for 250 mm thick brickwork and cement-sand mortar (1:6) shall be
used for 125 mm and 75 mm thick brickwork.Thickness of 1:6
cement-sand plaster on brick masonry shall be 18 mm for outside, 12
mm for inside and thickness of 1:4 cement-sand plaster shall be 6 mm
for ceiling.
v) Materials for precast concrete components including joint fixing, lifting

hooks and other exposed steel components shall conform to technical
specification and other points mention in the document.
9.10.00 Grating
Steel gratings, where required, shall be fabricated out of steel flats with
minimum thickness of 6 mm. Thickness of fabricated grating shall be 32 mm
with flats so arranged as to have a maximum opening of 25 mm or less.
Treads for staircases, where needed, shall be of similar grating construction
but provided with toe flats of 6 mm thick, and non-skid nosing in an approved
manner extending up to 100 mm above the walkway surface. All steel
gratings shall be galvanized and applied with anticorrosive coating specified
elsewhere.
9.11.00 Paving
The finished ground level shall be paved for 3.0m width all round the outer
edge of the cold water basin. The paving shall consist of 150 thick RCC slab
of M-20 grade over soling. The minimum reinforcement shall be 10 mm dia
spaced 150 mm center to center both ways top and bottom. The RCC slab
shall be overlaid 100 mm thick M-10 PCC mat and 300 mm well compacted

sand layer. All around peripheral RCC drain leading to drain chamber shall be
suitably provided.
9.12.00 Fittings and fixtures
a) Complete system of Lightning protection, Aviation warning lights and

Access ladder to be provided as per Clause 7.5 of IS 11504 (latest).
10.00.00 ELECTRICAL ITEMS
Refer Volume- V-B, Section-XV.
11.00.00 TESTING AND INSPECTION
11.01.00 Test at Manufacture’s work
11.01.01 The manufacturer shall conduct all tests required to ensure that the
equipment furnished shall conform to the requirements of this specification
and shall be in compliance with requirements of applicable codes and
standards.
11.01.02 The particulars of the proposed tests and the procedures for the tests shall be
submitted to the Purchaser/Consultant for approval before conducting the
tests.
11.01.03 Inspection shall be conducted by the manufacturer to establish and maintain

quality of workmanship, to ensure mechanical accuracy of components,
compliance with drawings, identity & acceptability of all material, part and
equipment. Where specified, all such inspections shall be conducted in
presence of Purchaser's representatives.
11.01.04 The Bidder shall submit to the Purchaser/Consultant at the initiation of the
contract, the detailed bar chart showing the manufacturing program and
indicating the period when Purchaser or his authorized inspecting agency are
required at the shop for inspection and/or testing. Also, the manufacturer shall
intimate the Purchaser 3 to 4 weeks in advance of such tests. The
Purchaser/Consultant shall be given full access to all tests and inspection.
11.01.05 All materials used for cooling tower construction shall be of tested quality.
Materials shall be tested as per the relevant standards or codes and test
certificates shall be made available to the Purchaser/Consultant.
11.01.06 Where stage inspection is specified, all material test certificates shall be
correlated and verified with the actual material used for construction before
starting fabrication by Purchaser's inspector who shall stamp the material. In
case mill test certificates for the material are not available, the supplier shall

carry out physical and chemical tests at his own cost from a testing agency,
approved by the Purchaser, as per the requirements of specified material
standard. The samples for physical and chemical testing shall be drawn up in
presence of Purchaser's inspector who shall also witness the testing.
11.01.07 Hydrostatic testing for hot water distribution piping shall be at a pressure of
200% of design pressure after fabrication at shop.
11.01.08 Butterfly valves shall be tested as per the stipulations of AWWA C- 504, latest
edition.
11.02.00 Tests at Site
11.02.01 After completion of construction, erection and commissioning of the cooling

tower, performance test of the cooling tower shall be carried out as specified
in Data Specification Sheet in accordance with Cooling Tower Institute
Bulletin No. ATC-105 "Acceptance Test Procedure for Water Cooling Tower"
or ASME (USA) performance test code PTC: 23 or other equivalent mutually
agreed method. The details of the proposed test procedure shall be submitted
by the supplier sufficiently in advance of the commencement of test for the
review and approval of the Purchaser.
11.02.02 Necessary correction curves required for correcting the test results for any
difference between test and guaranteed design conditions shall be furnished
by the supplier for approval along with the proposed test procedure.
11.02.03 All testing and calibrating instruments required for site performance tests shall
be arranged by the cooling tower supplier without any extra cost.
12.00.00 PERFORMANCE GUARANTEES
12.01.00 Each equipment shall be guaranteed to meet the performance requirements

as specified. If during the performance testing of the tower, the actual cooling
water temperature obtained is higher than the guaranteed cooling water
temperature (obtained from the performance curve) corresponding to the
flow, wet bulb temperature, relative humidity and cooling range prevailing
during the test, the contractor shall satisfactorily rectify all defects within
scheduled time period.
12.02.00 After the tests conducted at the Manufacturer's works in accordance with this
specification, rectification of any defect observed shall be satisfactorily done
without charging any extra cost to the Owner.
12.03.00 The performance test shall be carried out at site as specified and all defects
shall be satisfactorily rectified within scheduled time period. No extra cost
shall be charged to the Owner for such rectification. After rectification,
retesting will be done by Bidder without any extra cost to Owner till

satisfactory performance is achieved.
12.04.00 The bidder shall guarantee that the cooling towers offered shall meet the
ratings and performance requirements stipulated in this specification. The
bidder shall also furnish a declaration for certain guaranteed parameters like
“Fulfillment of cold water temperature” which shall attract levees of liquidated
damages for shortfall in performance. In case the contractor does not fulfill
the guaranteed parameters, purchaser may undertake to rectify the
system/equipment and expenditure incurred along with any other incidentals
shall be recovered from the contractor.
13.00.00 DRAWINGS/DOCUMENTS, DATA & INFORMATION TO BE FURNISHED

BY THE BIDDER ALONG WITH THE TECHNICAL OFFER
13.01.00 The Bidder shall furnish along with his proposal following specific
drawings/documents/data as asked for in this section.
13.01.01 General arrangement drawing for cooling tower, incorporating all relevant
dimensions, material of construction of different parts, limits of scope of
supply of piping, limits of civil works included, basin details indicating overflow
and de-sludging arrangement, arrangement of staircase, ladders, platforms,
lightning protection system, Aviation obstruction lightning system of cooling
tower etc.
13.01.02 Predicted performance curves, showing wet bulb Vs. cold water temperatures
for design cooling range, 85% cooling range and 115% cooling range. Such
curves shall be furnished for 85%, 100%, 115% flow. In case more than one
operating point is specified, all above details/curves are to be furnished
corresponding to all additional operating points also.
13.01.03 Cooling Tower Manufacturer's detailed literature including drawing and

diagram for :
a) Tower fills with supporting arrangement.
b) Drift eliminator.
c) Complete distribution system including regulating type water

distribution valves, distribution basin/pipes, orifices/ nozzles, etc.
13.01.04 Electrical power distribution scheme.
13.01.05 A detailed experience list about supply of similar plant by the Bidder/
Manufacturer and his collaborator.
13.01.06 A comprehensive write-up or Brochure on the details of manufacturing and

testing facilities in the shop of Manufacturer.
13.01.07 All other relevant data and drawings as asked for in the specification and as

required.
13.01.08 A sample of the fill material to be used for the specified cooling tower.
13.01.09 Bidder's proposal covering chemical treatment of cooling water to minimize

biological fouling, scaling and corrosion as well as for containing
concentration factor.
14.00.00 DRAWINGS/DOCUMENT, DATA, AND MANUAL TO BE FURNISHED

AFTER AWARD OF CONTRACT
14.01.00 Final version of all drawings/data/informations asked for in clause 13.00.00

above.
14.02.00 The following drawings shall be submitted within a reasonable time after
placement of order :
14.02.01 General arrangement of the cooling tower, indicating all principal dimensions,
extent of platforms, walkways, handrails, stairs, doors, illumination,
arrangement of cooling tower structure and limits of supply and erection of
piping, electrical and civil works.
14.02.02 Arrangement drawing of the cold water sumps and sludge pits for the cooling
tower, incorporating also arrangements of screens, sluice gates, butterfly
valves, gate valves, piping, and monorail chain pulley block installation, etc.
14.02.03 Performance curves as described in Clause 12.01.02.
14.02.04 Following drawings on mechanical equipment, their drives and accessories:
i) Fabrication and piping erection drawing.
ii) Outline and sectional drawings of valves of each category indicating

also material of construction.
iii) Drawing on fill, drift eliminator and its support systems and fastening
arrangement complete with data on material of construction.
iv) Drawing on splash boxes, nozzles in hot water basin, with data on
material of construction.
v) Drawings on screens & gates with material of construction.
14.02.05 Electrical Drawings and Data as specified in Volume- V-B, Section-XV.
14.02.06 Detail technical particulars of equipment and materials under the scope of this
specification.

14.02.07 Drawings, Data and Calculation on Civil works
i) Design calculations for strength and suitability showing justification for

size of members chosen for all structural components of the cooling
tower inclusive of pre-stressed concrete fill where applicable.
ii) Load drawings setting out clearly and concisely the various loads
taken into consideration for design.
iii) Civil drawings for cold water basin, connecting channels, partitions,
louvers, end walls, longitudinal beams, hot water distribution basin, its
covering, staircase, platforms, cable trenches, etc. all complete.
iv) Bar bending details for all reinforced concrete structures.
v) Insert details, anchor bolt details.
vi) Final painting schedule.
vii) Other drawings & data as necessary.
14.03.00 The Documents to be submitted before dispatch of Equipment for approval
14.03.01 Material Test Certificate for mechanical equipment.
14.03.02 Certificates on treatment done on timber components.
14.03.03 Test certificates on each electrical equipment, cables and accessories.
14.03.04 Instruction Manuals
i) The Instruction Manuals shall present the following basic categories

of information in practical, complete and comprehensive manner
prepared for use by operating and/or maintenance personnel :
 Instruction for initial installation of mechanical and electrical

equipment.
 Instructions for operation, control, monitoring and protection.
 Instruction for maintenance, overhaul and replacement of parts

etc.
 Recommended inspection points & periods of inspection.
 Lubrication Chart.
 Ordering information for all replaceable parts, etc.

 Write-up, leaflet/catalogue etc. covering equipment features.
ii) The information shall be organized in a logical and orderly sequence.

A general description of the equipment including significant technical
characteristics is required to familiarize operating and maintenance
personnel with the equipment.
iii) Necessary drawings and/or other illustrations shall be included or

copies of appropriate certified drawings shall be bound in the manual.
Test, adjustment and calibration information, as appropriate, shall be
included and shall be identified to the specific equipment. Safety and
other warning notices and installation, maintenance and operating
cautions shall be emphasized.
iv) A parts list shall be included showing part nomenclature,

manufacturer's part number and/or other information necessary for
accurate identification and ordering of replacement parts.
v) Instruction and part list shall be legible and prepared on good quality
paper.
vi) The Instruction Manual shall be securely bound in durable folder.
vii) If a standard manual is furnished covering more than the specific

equipment purchased, the applicable model (or other identification)
number, part number and other information for the specific equipment
purchased shall be clearly identified.
viii) The Instruction Manual shall include list of all special tools and tackle
furnished with complete drawing and instruction for use of such tools
and tackle.

ANNEXURE-A
DATASHEET FOR NATURAL DRAFT COOLING TOWER
1.0 General Information
Type of Cooling Tower : Natural Draft, Hyperbolic
No. of Cooling Towers Required : One
Location : Outdoor
Duty : Continuous
2.0 Design Working Conditions
Hot water inlet temperature : 42.0oC
Design Ambient wet bulb temperature (WBT) : 28oC
Design Ambient temp. for electrical equipment : 50oC
Design Ambient Relative Humidity (RH) : 44.96%
Whether inlet air wet bulb temperature to be

corrected considering re-circulation as per
CTI bulletin PFM-116 : Yes
Design CT inlet wet bulb temperature : By Bidder
Basin Holding Capacity : 6 mins of design CT capacity
Design Wind speed : As per site data
3.0 Performance Requirement
Rated Cooling Water flow : By Bidder
Cooling range : 10.5°C
Approach to ambient wet bulb temperature : 5.0°C
Maximum permissible drift loss : 0.002%

Design pressure for hot : By Bidder

water distribution system
Operating range to be established by cooling : As per Clause no. 5.03.00

tower characteristics curves and performance
curves
4.0 Special Features
Type of Tower design. : Counter-flow / Cross-flow

(Bidder to justify his offer)
Type of fill : PVC Splash

(V-bar type of approved
make)
Whether fills are removable type : Yes
5.0 Material of Construction
Cold water basin, outlet channel/sump & sludge pit : R.C.C.
Casing & superstructure : R.C.C.
Basin diagonal partition, if any : R.C.C.
Staircase : R.C.C./HDG Steel
Hot water distribution piping
 Inside Tower : HDG Steel/PVC
 Outside Tower : MS pipes with PVC/FRP

Wrap on outside.
Hot water distribution nozzles : Polypropylene/Approved

Equal
Fills : PVC with minimum spacing

of 20 mm
Fill Support : R.C.C./HDG Steel
Louvers : R.C.C.

Drift eliminator : PVC
Hot water piping : IS: 3589
Butterfly valve for hot water distribution

system/cold water outlet channel :
 Body : CI as per IS-210, FG-260
 Disc : - do -
 Shaft and spindle : SS304 as per ASTM A-479
 Shaft bearing : Leaded bronze, self

lubricated (BS-1400, LB-2)
 Seat ring : ASTM A-479, Type 304
 Gland packing : Impregnated Teflon
 Seal : Nitrile Rubber, Shore

Hardness 50-60 Deg.
 Bolts & Nuts (in contact with water) : Stainless Steel

Sludge pit isolation valves:
 Body : CI IS-210, FG-260
 Spindle & Trim : Stainless Steel.
 Sludge outlet pipe : CI IS-1536, LA
 Screen : Anodised Aluminium
 Guide for screen : CI IS-210, FG-260
 Bolts, nuts & other hardware : Stainless Steel
6.0 Inspection And Testing
Quality surveillance by : Manufacturer/Purchaser
Material testing and identification : Required
Stage inspection to be witnessed by Purchaser : Yes

Hydrostatic test for piping & valves required : Yes
Hydrostatic test to be witnessed by Purchaser : Yes
Field performance test of individual items and : Yes

the cooling tower as a whole required
Field performance test to be done by : Manufacturer/EPC

Contractor
All tests on the Butterfly valves at manufacturer's : Yes

works to be witnessed by Purchaser
All testing instruments by supplier : Yes
Commissioning at site by : Manufacturer/EPC

Contractor


NDCT Specs

Uploaded by

Copyright:

Available Formats

NDCT Specs

Uploaded by

Document Information

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

NDCT Specs

Uploaded by

Copyright:

Available Formats

TITLE : SPECIFICATION NO.

c) For Electrical, Civil Codes/ Standards refer respective Specification.

d) BS-4485 – Specification for Water Cooling Tower.

3.0 DESIGN REQUIREMENTS:

4.0 CONSTRUCTIONAL FEATURES:

4.1 Casing and Louver (If required):

4.4 Fill Supports:

4.5 Drift Eliminations:

4.6 Hot Water Distribution System:

4.7 Cold Water Basin:

4.8 Submersible sludge Pumps:

4.9.0 Screens & Gates in Cold Water outlet Chamber:

6.0 TEST AT SITE:

7.0 PERFORMACNE GUARANGTEE, TOLERANCE & PENALTIES:

cooling range, water loading of the tower.

8.0 SPECIAL CLEANING PROTECTION & PAINTING:

8.2 INSIDE SURFACE OF PIPING & VALVES IN HOT WATER RISERS:

8.3 Outside Surface of Piping (Buried):

8.3.1 Surface treatment as specified in Data Sheet-A.

8.3.2 Coating/ wrapping/ concrete lining as specified in Data Sheet-A.

8.4 Outside Surface or Piping (Exposed):

8.4.1 Surface treatment as specified in Data Sheet-A.

8.4.2 One coat of red oxide primer.

9.0 DRAWING AND DATA AFTER AWARD OF CONTRACT:

10.0 SPECIAL TOOLS & TACKLES:

DATA / DOCUMENTS TO BE FURNISHED BY VENDOR AFTER AWARD OF

2. General Arrangement drawing of Cooling Tower basin indicating overflow and

3. General Arrangement and Sectional Assembly drawings pertaining to the following

a) Tower fill with supporting arrangement.

b) Drift eliminator installation and details.

7. General Arrangement and cross-sectional assembly drawings of sludge pumps and

8. Electrical drawings and data.

vi) Drawing of lighting sub-distribution board & junction boxes.

10. Drawings, data and calculation on civil works :

iv) Bar bending details for all reinforced concrete structures.

v) Insert details, anchor bolt details.

vi) Final painting schedule.

vii) Other drawings & data as necessary.

13. Operation and Maintenance Manuals

15. Cooling tower performance test procedure.

1.0 GENERAL INFORMATION

No. of Cooling Towers required : Two (02) nos.

Location Out door

Type Natural draft Counter flow with PVC

2.0 DESIGN PERFORMANCE FOR EACH

2.1 Design Cooling water flow : 90000 M3/hr.

2.2 Design ambient wet bulb temp. : 28.0 oC

2.3 Design inlet air wet bulb temperature. : 28.0 oC

2.4 Approach w.r.t. design inlet air wet bulb : 5.0 oC

2.5 Cold water temperature : 33 oC

2.6 Hot water inlet temperature : 42 oC

2.7 Cooling Range : 9 oC

2.8 Design ambient Relative Humidity : Based on meterological data of Chennai

2.9 Liquid Handled : Sea water (refer details of cooling

a) Total CW Pumping head permissible : Not to exceed 16 MWC

x Static head w.r.t. FGL

2.10 Maximum permissible drift loss : Max. 0.005 %

2.11 Design pressure for hot water : 5 kg/cm2(g)

2.12 Maximum Basin Diameter : 130 M