annexure-a to tcn - 02 - · pdf filecti code. & performance test of cooling tower shall be...

ANNEXURE-A TO TCN - 02 Job : Design, engineering, manufacturing, supply, (0.0 M above & below), testing, erection, commissioning, etc of IDCT

including civil work above 0.0 M & preparation & submission of BOQ for civil works below 0.0 M, supervision of civil & structural works below 0.0 M of 2(two) no induced draft cooling tower (IDCT) for 2x250 MW Barauni Extension Project Unit # 8 & 9 at Begusarai, Bihar.

Ref : Tender No. PSER:SCT:BRM-M1401:12

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Clause of tender document

DESCRIPTION Bidder's query BHEL’S CLARIFICATION

Pre-Qualifying Criteria. 1 NIT. Sr. no. 2 BIDDER SHOULD HAVE

EXECUTED DESIGN,ENGINEERING , MANUFACTURING, TESTING AT SHOP, SUPPLY , ERECTION, CONSTRUCTION, TESTING,COMMISSIONING , PG TEST, HANDING OVER TO CUSTOMER OF IDCT OF ATLEASTTWO UNTIS OF CAPACITY 250 MW AND ABOVE, WHICH ARE IN OPERATION,RUNNING SUCCESSFULLY FOR ATLEAST ONE YEAR.

We are able to meet the technical PQ criteria based on the credentials of our parent company M/s. Gammon India Limited while we can meet the commercial PQ criteria on our own. The back-up guarantee shall be based on credentials of our parent company M/s. Gammon India Limited. We request you to kindly accept the same so that we can fulfill your requirement for qualification.

As per NIT

Scope of work 2 SCC. (SERVICE)

, Vol. ID, Cl. 1.0, Pg. 3/20 & Cl. 1.01.00

Receipt at site, handling, storage, civil & structural work ±0.0 M above (including supply of cement & reinforcement and all steel as per tender provision), … The Cement and

Please clarify the scope of supply of cement and steel.

Supply of steel & cement for ±0.0 M above is in the scope of bidder.




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SPEC NO. PE-TS-374-165-N001 , Vol. IIB, Sec A

Reinforcement Steel, for CT's are excluded from Bidder's scope and shall Be free issue as per NIT. However, Structural Steel shall be in scope of bidder.

3 SCC. (SERVICE) , Vol. ID, Cl. 2.2, Pg. 3/20

&

ANNEXURE -I TO SECTION - C : ELECTRICAL SCOPE BETWEEN BHEL AND VENDOR , Sr. no. 5

Supervision of civil & structural work below 0.0 M level but excluding the construction of civil and structural work below 0.0 M. level. Cable trays, accessories, & cable tray support.

As per this scope cable trench will not be in bidder’s scope of Supply and construction.

Design, Preparation of BOQ & Supervision for all civil work below ±0.0 M required for completion of cooling tower is in the scope of bidder.

4 SCC. (SERVICE) , Vol. ID, Cl. 2.2, Pg. 3/20

Supervision of civil & structural work below 0.0 M level but excluding the construction of civil and structural work below 0.0 M. level.

Please confirm whether Excavation and back filling required for underground hot water header will be in bidder’s scope?

Construction of civil work below ±0.0 M is excluded from the scope of bidder.

Technical 5 Cl. 2.0

SPEC NO. PE-TS-374-165-

Please provide us the Design relative humidity to be considered

Refer Project Information ,Sl. No- C, Section -B of Vol.-IIB.




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N001 , Vol. IIB, Sec C1

6 Cl. 7.3 SPEC NO. PE-TS-374-165-N001 , Vol. IIB, Sec C1

Cell partition walls : RCC We propose to provide pre cast concrete blocks. This will reduce the construction time and it will not have impact on the structural strength as it is not a load bearing member.

This option is already given in specification, refer Cl.no.- 1.3(d),Section-C,Vol-IIB ,Book- 2 of 2 of technical specification in this regard.

7 Cl. 7.5 SPEC NO. PE-TS-374-165-N001 , Vol. IIB, Sec C1

Fan stack : RCC We propose to provide FRP fan stack. This will provide better efficiency and recovery. As it is a manufactured product the construction time will reduce.

Bidder to comply technical specification

8 Datasheet A - Cl. 1 & 2.7 SPEC NO. PE-TS-374-165-N001 , Vol. IIB, Sec C1

Fill Type : PVC film type fills Liquid Handled : Clarified water (refer details of cooling water analysis)

We understand that the TSS of clarified water is less than 100 ppm hence film fill is proposed In the tender. Please confirm.

Yes, it is confirmed that the TSS shall be 15 ppm for clarified water in Cooling Tower.

9 Datasheet A - Cl. 7.28& 7.30 SPEC NO. PE-TS-374-165-N001, Vol. IIB, Sec C1 & Sec C, Vol. I (Civil works for

Sluice gates in cold water outlet : CI to IS 210 FG-260/CS to IS 2062 , Screen & stop log gates and trash rack for cooling tower

Please clarify whether we have to provide stoplog gate or sluice gate. Please clarify whether we have to provide SS 304 screen or trash rack.

Refer Cl no- 2.01.01(f). Bidder to provide Stop log gate along with handling arrangement. As per Cl. no- 7.30 ,Data sheet-A of section -C1,Vol-IIB of tech. Specification. Bidder to provide Screen.




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cooling tower) Cl. 1.7.0

10 Specific technical requirements - Cl. 8.00.00 SPEC NO. PE-TS-374-165-N001, Vol. IIB, Sec C1 &Datasheet A Cl. 9.9 SPEC NO. PE-TS-374-165-N001, Vol. IIB, Sec C1

All cooling towers……. However the performancetesting shall be based on permissible ambient inlet Wet bulb temperature, ……… as per CTI code.

&

Performance test of cooling tower shall be carried out at ambient temperatures close to design ambient.

Please specify whether the performance test have to be carried out based on ambient wet bulb temperature or inlet wet bulb temperature.

Bidder to comply Cl.no- 8.00.00 of section -C1, VOl-IIB of technical specification.

11 Specific technical requirements - Cl. 8.00.00 SPEC NO. PE-TS-374-165-N001, Vol. IIB, Sec C1 & Standard technical specification Cl. 6.2 Spec. No.PES-

All cooling towers shall be performance tested at site as per ATC 105. ………….flow etc. as per CTI code.

&

The performance test of the cooling ……….cooling tower Institute Bulletin No. ATP 105 Acceptance test for Industrial Cooling Tower.

We understand Performance testing would be as per ATC 105. Please confirm.

Bidder to comply Cl.no- 8.00.00 of section -C1 Vol-IIB of technical specification.




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165-09,vol IIB sec D

12 Specific technical requirements - Cl. 8.00.00 SPEC NO. PE-TS-374-165-N001, Vol. IIB, Sec C1 & Standard technical specification Cl. 6.2 Spec. No.PES-165-09,vol IIB sec D

Query Not understood as no clarification sought under this.

13 Technical specification for cooling tower , Vol. IIB , Sec C1 , Cl. 6.11

Drain piping from sludge pit : yes, to nearest surface drain

Please provide us the distance from sludge pit to the nearest surface drain.

Refer Cl. no- 2.01.01(i), sec-C1,Vol-IIB of tech. Specification.

14 Technical specification for cooling tower , Vol. IIB , Sec C1 , Cl. 7.6

MOC of internal walkway : RCC

We propose to provide internal walkways of MSHDG, Please confirm.

Bidder to comply technical specification in this regard

15 Technical Louvers : RCC Our design is without louvers, we Noted.




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specification for cooling tower , Vol. IIB , Sec C1 , Cl. 7.16

provide spray catchers. This will minimize the inlet air obstruction.

16 Standard technical specification , Vol II B , Sec D. Cl. 8.1

For every KW difference in power consumption of fan, loading at the rate given in Data Sheet-A shall be considered.

We understand this clause is not applicable. Please confirm.

Refer Cl no- 5.03.00,sec-C1 Vol.-IIB of tech. Specification.

17 General Please provide us the format of technical datasheet of induced draft cooling tower to be submitted.

Refer Vol-III for format of Data sheet-B -Cooling Tower as attached herewith .

18 Technical specification for cooling tower , Vol. IIB , Sec C1 , Cl.12.00.00

Bid Evaluation criteria Please clarify the applicability of this clause as cement and steel required for works above 0.0 m level are in bidder’s scope.

Supply of steel & cement for ±0.0 M above is in the scope of bidder.

19 Technical specification for cooling tower , Datasheet – A, Vol. IIB , Sec C1 , Cl.12.00.00

Number of cold water outlet channels: One for each compartment of CW basin. Cold water outletshall be 8 M wide (clear width - excluding wall thickness) at CT basin outlet for each compartment. At T.P. Bidder tomatch same as per T.P. drawing.

Please provide us the T.P. drawing.

The outlet duct of each basin shall be matched as per Annexure- II of Section-C1,Vol-IIB of Tech spec.

Civil




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20 VOLUME – II B SECTION – C REV.-2 Clause No.3.02.01 Ground Improvement

(pg. 160) Being the site filled with pond ash deposit, the cooling tower area shall be improved by installing stone columns (500mm) by driving a mild steel casing pipe with a detachable mild steel shoe and back filled with compacted sand-gravel mix. (pg.161) Bidder shall note that ground improvement as described shall be provided under cooling tower and other structures under Bidder’s scope in addition with Pile foundation.

We propose that the ground improvement works be carried out by a single contractor for the entire plant, as this is a specialized job. This will also be economical from the total project cost point of view.

This is not in the scope of bidder.

21 VOL ID , pg 3/20 Cl. No. 2.2

Construction of civil and structural works below 0.0 M is excluded from bidder’s scope.

This is in contradiction to cl. No. 3.02.01 (vol. IIB Sec C, Rev 2) .Please confirm the scope of ground improvement.

Construction of civil and structural works below 0.0 M is excluded from bidder’s scope. However supervision of civil work below 0.0 M & finalisation of BOQ for this civil works is in the scope of bidder.

22 General Please provide us 1) plot plan 2) contour diagram. 3) cooling water system P&ID

Pls refer attached Drgs:- 1) Plot Plan- PE-DG-374-100-M04 Rev-04. 2) SOFT COPY OF APPROVED




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CONTOUR DRAWING SHALL BE ARRANGED FROM BARAUNI SITE AT PSER END AND FURNISHED TO VENDOR. 3) CW P&ID shall be furnished during contract execution.

Electrical 23 SECTION-IX 113

of 321 clause 1.01.00

The scope of work covers complete and efficient erection, testing and commissioning of lightning protection system, all cabling and electrical grounding works. The scope shall broadly cover, but not be limited to : 1. Main Power House Building 2. Boiler area, ESP stack 3 Transformer yard

Our scope of work is limited to CT area. Please confirm

NOTED AND CONFIMRED

24 SECTION-IX 116 of 321 clause 4.01.02

In order to meet the above objectives, ground grid mesh will be provided for the main plant complex. viz. switchyard, transformer yard adjacent to power house building, power house building and boiler area up to


NOTED AND CONFIMRED




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stack, auxiliary buildings, etc.

25 SECTION-IX 117 of 321 clause 4.01.03 b

The minimum conductor section is determined on the basis of ground fault current. This section is then increased by an allowance to account for the soil corrosion loss of 0.3 mm per year over the design life of 30 years.

Kindly provide the fault current and soil resistivity.

BIDDER SHALL PROVIDE 40MM DIA MILD STEEL RODS FOR BELOW GRADE GROUNDING


The ground grid mesh is designed to keep the touch and step voltages within safe limits as per recommendation of IEEE 80.

We will follow IS3043. IS-3043 SHALL BE FOLLOWED FOR THE EARTHING OF COOLING TOWER. HOWEVER, STEP AND TOUCH POTENTIAL SHALL BE DEFINED BY IEEE-80 ONLY.


Lightning protection shall be provided for Power House building, auxiliary building chimney, cooling tower and other structure


NOTED AND CONFIRMED

28 SECTION-IX 118 of 321 clause 4.02.05 g

For air terminals of chimney, lead coated copper tube suitably brazed with G.S. Band ring shall be provided.

We consider it to be not in our scope. Please confirm

NOTED AND CONFIRMED

29 Annexure-1 to sec C: Electrical

Equipment grounding &lightning protection----

Since sizes are not provided for all equipment we will go by

SIZES SHALL BE PROVIDED TO BIDDER DURING CONTRACT




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scope Point 7 Material and sizes shall be as per specification

relevant IS standards (IS 2043 & IS 3043) and our sizing calculation.

EXECUTION STAGE.

30 General Kindly provide approximate distance between the cooling tower and MCC room. Kindly provide an auto cad drawing of Cooling tower area. Also provide MCC room layout with tentative switchgear locations.

DISTANCE BETWEEN THE COOLING TOWER AND MCC ROOM IS 200M (APPROXIMATE). FURTHER, AUTOCAD DRAWING OF THE MCC ROOM SHALL BE PROVIDED DURING CONTRACT EXECUTION STAGE.

31 Specific technical requirements - Cl. 3.2 SPEC NO. PE-TS-374-165-0001, Vol. IIB, Sec C

No technical submittal such as copies of data Sheets, drawings, write-up, quality plans, type test certificates, technical literature, etc, is required during tender stage. Any such submission even if made, shall not be considered as part of offer.

By this statement we understand that we do not have to submit the technical datasheet for motor and lighting as per datasheet A, spec.no. PE-TS-374-165-001, Vol. IIB Sec D and spec.no. PES-558-02, Vol. II Sec D respectively. Please confirm.

NOTED AND CONFIRMED FOR TENDER STAGE BUT THESE ARE TO BE SUBMITTED AFTER ORDER.

32 STANDARD QUALITY PLAN , Vol. IIB , SEC D Pg.54 , 55 , 56 ,62

Please furnish us these pages again as the words are not legible.

Refer Annexure-II for Standard Quality Plan-CT as attached herewith.

33 STANDARD TECHNICAL SPECIFICATION (ELECTRICAL.)

DESIGN MEMORANDUM FOR LIGHTING SYSTEM HAS BEEN ATTACHED FOR REFERENCE AT YOUR END.




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Spec.no. PE-TS-374-165-N001, vol. IIB, D2. Pg. 77 - 81

Instrumentation 34 Specific tech.

requirements (C&I) cooling tower, Section: C Rev.01, Clause no. 1.3 Page no. 38 (table)

Measuring instruments (Primary & Secondary) Sr. no. 1) Temp. Gauge sensing element & material shall be Mercury in steel below 450 Deg. C and inert gas actuated for above 450 Deg. C of SS bulb and capillary.

We propose to Provide Gas filled temperature gauges instead of mercury filled gauges for below 450 Deg. C. Please confirm

Acceptable

35. Specific tech. requirements (C&I) cooling tower, Section: C Rev.01, Clause no. 1.4 process actuated switches Page no. 39 (table)

Measuring instruments (Primary & Secondary) Sr. no. 1) Level switch sensing element shall be Capacitance types for oil and dirty medium, water, condensate application.

As per our previous projects done with BHEL/NTPC we had supplied float type oil level switches. Hence we propose to supply Float type oil level switch in place of capacitance type oil level switches. Please confirm.

Acceptable

36 Specific tech. requirements (C&I) cooling tower, Section: C Rev.01,

Sr. No. 7. Accessories: Thermo well (as specified below) and shall be spring loaded for positive contacts With the well.

Point not cleared. Ignore the statement-"spring loaded for positive contacts With the well".




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Clause no. 1.5 Resistance Temp. Detector (RTD) Page no. 40

37 We propose to supply Vibration transmitters (2 wired, loop powered, 24 VDC, 4-20 mA output) on Fan’s motor instead of vibration switches. Where vibration transmitter’s have the advantage over switches that where we can monitor vibrations at OWS as well as tripping cab be programmed at any range in between 0-20 mm/sec. Please confirm the acceptance.

Noted. All accessories-vibration sensors with cabling up to local JB shall be in vendor’s scope.

38 Please provide us the technical specifications of signal cables, avg. pitot tube with manometer, Anemometer, Psychrometer& Vibration switches/transmitters.

Instrumentation shall meet the process requirement and shall be procured from BHEL approved sub-vendor make during detail engineering. Vendor to supply equipment mentioned as per their standard and submit data sheets for our review.

39 We would require technical info. / details on Instruments ITP, mandatory spares requirement,

Instrumentation technical details ITP, vendor list shall be subject to BHEL approval during contract. Vendor shall




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Vendor list, etc. follow BHEL approved vendor list. The same shall be available during contract stage. For sub vendors of packaged items vendor can follow their standard vendor list. For major items not in BHEL vendor list vendor shall submit the same for BHEL approval. There is no any mandatory spares list.

40 Annexure-I to section-C: Electrical scope between BHEL & Vendor Rev.0, Sr. no. 3

We have to lay the cable in between wherever one end is in contractor scope. Please provide the distance between Cooling tower battery limit (BL) to DCS for laying of BHEL supplied multi-pair (field shield) cables as well as distance between MCC to DCS for laying of BHEL supplied electrical control cables.

Kindly note that the Battery limit for Bidder is 10 m from Cooling Tower. Refer -Note- 3 Annexure-I to section-C: Electrical scope between BHEL & Vendor Rev.0, Sr. no. 3

41 Annexure-I to section-C: Electrical scope between BHEL & Vendor Rev.0, Sr. no. 3

The instrumentation scope will be as per Annexure-I to section.Please confirm.

This annexure is for cable scope only. Instruments shall be as per approved PIDs.

Commercial 42 SCC 75 % of contract price on We request you to consider As per tender provision.




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(SERVICE) vol. ID, C; NO. 22.1.2 Pg. 14/20

prorata basis…… making 85 % payment to ensure better cash flow and relax clause no. 22.1.36

I SPECIFICATIONS 43 10/321 TSS (Total Suspended Solids) As per the water analysis, value

of TSS is from 548 to 20,672 PPM. As per specifications, the fill shall be of PVC film type and COC is 6. Kindly confirm us whether any treatment will be done on the water and what is the TSS value of water inlet to cooling tower. Kindly note that PVC film flow fills will easily get clogged if the TSS values are more.

Kindly note that the Clarified water shall be used as makeup to CW system and its TSS shall be 15 PPM.

44 25/321 Total CW pumping head : 9 MWC

Considering the plot area of cooling towers (160 m x 22 m) and restriction in fan power of 900 KW, we request you to increase the maximum pumping head as 12 mtr. instead of 9 mtr.

Bidder to comply technical specification in this regard.

45 25/321 Gear box service factor : As per AGMA and CTI standard, Bidder to comply technical specification




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Minimum 4 the gear box service factor shall be minimum 2. Kindly confirm the gear box service factor.

in this regard.

46 27/321 Partition wall : RCC We intend to propose Precast concrete blocks as per page 177 of 321 instead of RCC. Kindly confirm.

This option is already given in specification, refer Cl.no.- 1.3(d), Section-C,Vol-IIB ,Book- 2 of 2 of technical specification in this regard.

47 27 / 321 Fan stack : RCC We intend to offer fan stack in FRP instead of RCC. Kindly confirm.


48 27 / 321 Internal walkways : RCC There is no internal walkway for counter flow cooling towers.


49 27 / 321 Drive shaft : SS 304 We intend to offer drive shaft tube as carbon fibre and couplings as SS 304. Kindly confirm.


50 28 / 321 Guide for screen : SS 304 We intend to offer guide for screen as MS HDG. Kindly confirm.


51 33 / 321 Laying of power cables Kindly specify the distance from cooling tower to Motor control centre (for fan drive motors).

DISTANCE BETWEEN THE COOLING TOWER AND MCC ROOM IS 200M (APPROXIMATE).

52 179/321 Protection of concrete and reinforcement steel against corrosion shall be provided.

Since the reinforcement steel is free issue by client, we shall not carryout any protection against corrosion. Kindly confirm.

Supply of reinforcement steel ± 0.0 M and above is in the scope of this contract, however reinforcement steel required for ± 0.0 M and below structure is excluded from the scope of this contract




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II CIVIL 53 Foundations and cold water

basin As per enquiry specifications, the cooling tower civil works + 0.0 M will be in vendors scope. Since the cold water basin is below ground level, we presume that the civil construction work for foundations and cold water basin will be excluded from cooling tower vendor’s scope. Kindly confirm.

As per the enquiry,the cooling tower civil works ± 0.0 M and above will be in the vendor scope.

54 Cement and reinforcement steel quantity

Since the cold water basin is excluded from cooling tower vendor’s scope, we shall furnish the cement and reinforcement steel quantity for RCC super structure only.

Supply of cement & reinforcement steel ± 0.0 M and above is in the scope of this contract,however cement & reinforcement steel required for ± 0.0 M and below structure is excluded from the scope of this contract

55 Foundations Kindly confirm the foundation type to be adopted. Whether pile or Isolated footings. We also request you to inform us the foundation type (Isolated footings/pile) adopted for the other equipments near the cooling tower.

BHEL adopted RCC piling & stone column for power house & other building structure. However cooling tower entire design, engineering is in the scope of vendor. accordingly bidder to decide.

56 What is the natural ground level (NGL) and Finished ground level

Finished ground level (FGL)is +45 M .as the working area is ASH POND so




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(FGL) in cooling tower area. did not getting the natural ground level. 57 Whether the construction power

and construction water is free issue or chargeable basis and if it is chargeable basis, please specify the same.

Construction power and water is free issue as per tender provision.However intial period of three months DG may be arranged by the bidder at their own cost.

BIHAR STATE ELECTRICITY BOARD

2X250 MW BARAUNI UNIT# 8 &9

DESIGN MEMORANDUM FOR

LIGHTING SYSTEM

DOCUM

APPROVED AS Release dic:.trihlltinn

VVlTH Proceed with fabrication 11II8fIIacIIII/...... . B · C-I considering comments and reiJJmltor N01 APPROVED • correct the orig"inal drawing duly IncorPntkIa GUt C C:J com; nents and resubmit for INFCmMATION NOTED

Infor:-~:;~an ~~~lished in the , ~

BHARAT HEAVY ELECTRICALS LIMITED POWER SECTOR

PR6JECT ENGINEERING MANAGEMENT NOIDA{UP) - 201 301

2980282

Text Box

ANNEXURE-I

DOCUMENT TITLE

DESIGN MEMORANDUM FOR STATION LIGHTING SYSTEM


DOCUMENT PE-DC-374-558-E001NUMBER

REVISION NUMBER 01 DATE 31.10.2011

SHEET 1 OF 14

1.0 SCOPE

1.1 This document outlines the basic approach for designing lighting and low voltage power services for various plants, buildings and areas within the scope of the contract.

1.2 The document includes the following lighting design details for different parts of the power station:-

(a) Various types of lighting systems. (b) Lighting System Design Basis. (c) Illumination levels & types of luminaires. (d) Low voltage power services.

1.3 Lighting design details for the following areas are not covered in this document:- (a) Switchyard(b) Coal Handling Plant(c) Ash Handling Plant (d) Chimney(e) Cooling Towers(f) Compound WallSeparate design documents as applicable for respective plant/area shall be referred for the above.

2.0 TYPES OF LIGHTING SYSTEM

2.1 Lighting system will be provided with AC Normal, AC Emergency and DC Emergency lighting as listed against various areas as per Table-I enclosed.

2.2 The sources of power supply are as below:

i) 415V AC Normal (ACN) Supply from different station PMCCs /MCCs/ACDBs

ii) 415V AC Emergency (ACE) Supply from Emergency Board.

iii) 220V DC Emergency Supply from DC Distribution Board.

iv) 24V AC supply (for maintenance lighting)

2.3 A.C Normal Lighting System:

2.3.1 AC Normal lighting fixtures are fed through a number of conveniently located AC Lighting Panels (ACLPs) which are fed from Lighting Distribution Boards (LDBs).

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2.3.2 Each LDB, consisting of a 100kVA/50KVA, 415/415V, taps of ± 5% insteps of 2.5%, resin impregnated (non encapsulated) air-cooled dry type isolation transformer housed in LDB with proper separation from distribution panels, will have one incomer with MCCB. The LDB outgoing feeders (8 nos. and 12 nos. for 50KVA & 100 KVA LDB respectively) will have 63A MCB.

2.3.3 The ACLPs will be provided with 63A MCB in incoming and 20A MCBs for outgoing. The MCB will be suitable for short circuit current of 9KA. ACLPs will have 6, 12 &18 outgoings. 20% spare feeder shall be provided in the LDBs and LPs.

2.4 AC Emergency Lighting System:

2.4.1 AC Emergency lighting fixtures shall be fed through suitable numbers of conveniently located AC Emergency Lighting Panel (ACELPs) which are fed from AC Emergency Lighting Distribution Board (ACELDB).

2.4.2 Constructional details / technical particulars of ACELDB and ACELP shall be same as ACLDB’s and ACLP’s described above.

2.5 220V D.C Emergency Lighting System:

2.5.1 DC Emergency lighting fixtures will be fed through suitable numbers of conveniently located DC Emergency Lighting Panel (DCELPs) which are fed through DC Lighting Distribution Board (DCLDB).

2.5.2 Each DCLDB will have 125A, 2-pole MCCB and contactor for incoming and 32A, 2-pole MCB for 12 nos. outgoing. 20% spare feeder shall generally be provided in the LDBs and LPs

2.5.3 The DCLPs will have 32A, MCB for incoming and 2- pole 20A MCB for 6 nos. outgoing. DC Emergency lighting system shall be 220V, 2-wire system. DCLDB shall be equipped with A/C under voltage relay and dedicated DC supply for emergency auto changeover scheme.

2.6 24V AC Maintenance Lighting System

Each 24V AC supply module will have one no. air-cooled two winding, 500VA, 1-phase, 50HZ, 240/24V transformer with 5A (240V side) and 15A (24V side) HRC fuse and necessary 240V and 24V terminals for incoming and outgoing connections. The 240V terminals of 24V AC supply module will be fed from respective lighting panels (LP). A group of 5A, 24V AC receptacles located near boiler access doors and condenser area will be wired up from 24V side of each 24V AC supply module.

2.7 Lighting circuits for main plant will be developed to ensure feeding of different LPs

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from separate LDBs. However, for remote areas (auxiliary areas) the lighting will be provided from LDB with one transformer. For each boiler platforms one LP shall be fed from one LDB and the other LP from another LDB and each LDB shall be fed from different PMCC. Fixtures on each boiler platform shall be fed from minimum two LPs.

2.8 For main plant area normally all AC luminaries (80% on ACN and 20% on ACE) will be in service and DC luminaires will be dark. Upon failure of AC normal supply and AC emergency supply, DC luminaires will be automatically switched ‘ON'. On restoration of AC supply, DC luminaries will be switched-off automatically after a time gap of three minutes following the restoration of supply.

2.9 For DG room 100% AC emergency lighting will be provided.

2.10 DC emergency lighting will be provided to meet functional/ operational requirements for UCR, stair cases and strategic points such as entrances. Fittings will be located at strategic locations for safe personnel movement during emergency.

The DCE shall be having following minimum lux level as following :

i) Emergency DG set room - 20lux ii) operating floors of turbine hall - 20lux iii) switchgear rooms - 15 lux (min one lighting fixture

between two rows of switchgear)

iv) Boiler platforms - At least 10% of total illumination v) Cable spreader room - At least 10% of total illumination vi) Central computer and - 100 lux (on equipments) relay rooms

2.11 For auxiliary areas Normal AC lighting will provide 100% illumination level and normally all AC lighting fixture shall remain “ON” as long as normal AC supply

is available. For safe personnel movement during non-availability of normal AC illumination, self-contained Ni-Cd battery operated emergency lighting units (ELU) with 4 hours duration will be provided for auxiliary areas as specified in the “Table –I, LIGHTING & LV POWER SERVICES IN DIFFERENT AREAS”.

Each battery will have battery charger and 2X10W fluorescent lamp.

3.0 LIGHTING SYSTEM DESIGN BASIS

3.1 Lighting system will be designed to ensure adequate visual performance, safety & reliability and will be free from excessive glare and flicker from discharge lamps. In Unit Control Room (UCR), particular attention will be given to ensure proper and

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aesthetic illumination so as to prevent any glare/ luminous patch on control surfaces/VDUs when viewed from an angle.

3.2 All fluorescent fixtures shall have energy efficient ‘T5’ type fluorescent lamps except those in DIV.2 hazardous area. The louvers of these fixtures shall be designed for ‘T5’ type fluorescent lamps. All fluorescent lamps shall have ‘cool day light’ colour designation. The mirror optics type fluorescent shall have no iridescence effect. Acrylic covers/ louvers will be of non-yellowing type. All outdoor fixtures will be weather proof type with DOP-IP55.

3.3 The DOP for LDB will be IP-52 and for transformer cubicle IP-42.The DOP for LP will be IP-54 for indoor and IP-55 with canopy for outdoors.

3.4 All outdoor fixtures will be weather proof type with DOP of IP55. 3.5 For Fuel Oil area and hydrogen cylinder room flame proof fixtures with

HPMV/fluorescent lamps will be suitable for Division-2, Group IIA/IIB of hazardous area as per IS-2148.

3.6 High-pressure sodium vapour lighting fixtures will be installed in areas with sufficient headroom of 5m or more. However in the areas where 5M headroom may not be feasible (e.g. boiler area), fixtures will be mounted on columns/bottom of platform as per site requirement. In general, the type of fixtures, type of luminaires and illumination levels to be achieved will be as per enclosed Table-II.

3.7 The lighting fixtures in the plant area will be group controlled from lighting panel by miniature circuit breakers. The lighting fixtures in office areas, control rooms etc. will be controlled by switches.

3.8 JB/switch boxes shall be of CRCA galvanised steel.

3.9 Indoor & outdoor lighting system will have contactor control with timer arrangement in lighting panel (LP) for controlling lights with additional provision for manual control.

4.0 ILLUMINATION DESIGN CALCULATION 4.1 Lighting design for indoor areas will be done by LUMEN method.

For a given indoor area, number of luminaires is calculated as follows:

L x W x Lux Level (Average) Number of luminaires = Lumen x COU x MF Where L = Length of room (Restricted to Max. 5 times of width) W = Width of room COU = Coefficient of utilisation

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Lumen = Lumen output of each lamp MF = Maintenance Factor

Coefficient of Utilisation (COU) is determined from the COU chart for a particular luminaire of the manufacturer, corresponding to selected reflection factors and calculated Room Index. The Room Index is calculated by the following formula:

L x W Room Index = -------------------- (L + W) x MH

Where MH = Mounting height of luminaire.

The Reflection Factor (RF) will be considered as given below: Ceiling (rc) Wall (rw) Floor (rf)

For air-conditioned area 50 30 10

For non air-conditioning area 30 30 10

For boiler area 00 00 00

Values of Maintenance Factor (MF), which includes the luminaire depreciation factor also as per IS-3646, will be considered as given below:

a) Boiler area : 0.6

b) Indoor area non-AC (except fluorescent fixture) : 0.7

c) Indoor area non-AC (fluorescent fixture) : 0.61$

d) Control room & air conditioned area : 0.8

$ : (0.7X0.87 = 0.609 � 0.61). where 0.87 is the ambient temperature correction factor for fluorescent fixture at

40�C in motionless air.

4.2 Lighting design for outdoor open areas shall be done through computer program as per standard norms for lighting design to meet the specified lux level.

4.3 STREET LIGHTING / OUTDOOR LIGHTING

4.3.1 The roads within the station plant boundary and as per contract will be considered for lighting.

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4.3.2 Street lights / outdoor lighting will be fed from street lighting panels (SLP) having timer arrangement with manual control facility. These lighting panels will be fed from nearest AC normal LDB.

4.3.3 For street lighting, 11/13 meter high lighting poles will be used. For outdoor area lighting, if required, flood light pole with height 12 M (above the ground) will be used. The poles will be as per IS-2713.

4.3.4 Street/flood light poles will be fabricated, painted, swaged or stepped, steel tubular poles with swan neck arrangement. The poles will be painted with anti-corrosive treatment & paint.

4.3.5 The poles will be located 1.5 M away from the road edge. The buried cable will run in Hume pipe wherever it is crossing the roads.

4.3.6 Other outdoor areas which are not covered under buildings peripheral lightings/road lightings can be provided with additional poles depending upon site condition.

5.0 LOW VOLTAGE POWER SERVICES

5.1 One number 240V AC, 5/15A universal socket will be provided in offices, stores, cabins etc. One number 20A, 240V AC industrial type receptacle will be provided at suitable location in all other indoor areas as required. All receptacles will be 3-pin type and will be controlled with a switch. In fuel oil area receptacles will be of flameproof type.

5.2 Since there is no functional requirement of 5/15A receptacles on all boiler platforms, 20A industrial type receptacles will be provided only on feeder floor, operating floors and boiler drum level in addition to welding receptacles (63A) at an average distance of 50M.

5.3 Suitable nos. of 63A, 3-phase, 415 V welding receptacles with MCB will be provided at specific points in the main plant area at a distance of 50 meter for welding purposes. Maximum four (4) nos. 63A receptacles will be fed through one feeder. Separate welding distribution board (WDB) will be used to feed these welding receptacles located in TG building and boiler areas. 63A receptacle will be provided in buildings as per Table-I, which will be fed from 415V MCC. In hazardous areas these receptacle will be located in MCC rooms.

5.4 Suitable nos. of ceiling fans with stepped electronic regulator and flush mounted on switchboard shall be provided in areas not covered by A/C and ventilation system.

6.0 WIRING / CONDUITS

6.1 Wiring of lighting system will be done as follows:

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i) Wiring installation will be by multi-stranded, PVC insulated, colour coded wires laid in galvanised MS conduits of 20mm dia minimum size.

ii) Conduits will be heavy-duty type hot dip galvanised steel conforming to IS-9537. Conduit accessories will be hot dip galvanised. In corrosive area, conduits will have suitable epoxy coating additionally.

iii) Flexible conduit shall be used where required. Flexible conduit shall be Bright, cold rolled annealed and electro galvanized mild steel strips and coated with PVC.

iv) Conduits in control room and other air-conditioned areas will be surface

mounted on the roof above false ceiling. However vertical drops of conduits will be within column flanges, finally covered for better aesthetics.

v) Conduit fill criteria will be 40%.

vi) Wiring for AC Normal, AC Emergency, and DC Emergency services will be run in separate conduits.

vii) Lighting and receptacles will be fed from separate circuits. No two different phase circuits will be run in the same conduit. However, different circuits of same phase may be laid in the same conduit.

viii) Maximum three number of receptacles will be looped in and looped out in a circuit.

6.2 a) 1.1KV grade, 2.5sqmm PVC insulated copper conductor wires conforming to IS: 1554-I will be used for lighting fixtures from switch/JB to fixture, from panel to fixture, JBs/switches.

b) 4.0 mm2, 1100 V grade, PVC insulated, single core, stranded copper conductor will be used for 5/15 & 20A receptacles.

c) Wiring in hazardous area will be done using 1.1KV grade, 3C-2.5 mm2 copper conductor, PVC insulated, FRLS PVC sheathed armoured cable

6.3 For outdoor area lighting, armoured cables will be used. For loop-in-loop out of cable from pole JBs, 50 mm dia conduit will be used. Hume pipe will be used where cables are crossing roads.

7.0 EARTHING

7.1 Earthing of lighting system will be done by using of following sizes of GS wire / flat:

i) 16 SWG GS wire for earthing of lighting fixtures, receptacles, conduits & switch boxes.

ii) 8 SWG GS wire for earthing of junction boxes.

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iii) 25x3 mm size galvanised MS flat for lighting panels & flood light/street light poles earthing.

iv) 65X10 mm size galvanised MS flat for earthing of LDB & welding sockets.

7.2 STATUTORY & REGULATORY REQUIREMENTS

Statutory and regulatory regulation shall be applicable as per Indian Electricity Rule, 1956 with amendment-3 rule no. 35, 48,49,50,61 & 64 for illumination and low voltage power services.

7.3 DOCUMENTS APPROVAL Lighting and conduit layout shall be approved by BHEL. Conduit layouts shall be

forwarded to site for erection.

8.0 Table-I gives the Lighting and LV Power services in different areas Table-II. gives the Average Lux Level and Type of Fixtures.Table-III gives the Area wise Distribution of Lighting System in the Plant Table-IV gives the list of abbreviations used.

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TABLE-I, LIGHTING & LV POWER SERVICES IN DIFFERENT AREAS

S.No

AREA ACN ACE DCE 5/15A

Socket

20A Ind. Socket

63AWldgSock

et

Emg Ltg Unit $

1. A-B BAY Y Y Y - Y Y -

2. B-C BAY Y Y Y Y* Y Y - 3 C-D-E BAY(UCR & EER) Y Y Y Y* - - -

4 CABLE VAULTS Y Y Y - Y Y -

5 BATTERY ROOM Y Y Y - Y Y -

6 BOILER PLATFORMS Y Y Y - Y Y -

7. BOILER/ ESP AREA Y Y Y Y* Y Y -

8 ESP CONTROL ROOM Y Y Y Y* Y Y -

9 TRANSFORMER YARD Y Y - - - Y -

10 VACUUM PUMP CUM COMPRESSOR HOUSE

Y Y Y Y* Y - -

11 COMPRESSOR HOUSE Y Y Y Y* Y Y -

12 SERVICE BUILDING Y Y Y Y* Y Y -

13 DG BUILDING - Y Y Y* Y Y -

14 CW TREATMENT BLDG Y - - Y* Y - Y

15 E.T.P. Y - - Y* Y - -

16 HYDROGEN GENERATION PLANT

Y - - Y* Y Y Y

17 CANTEEN BUILDING Y - - Y* Y Y Y

18 D.M.PLANT Y - - Y* Y Y Y

19 F.O.P.H. Y - - Y* Y Y+ -

20 RAW WATER PUMP HOUSE Y - - Y* Y - -

21 ADMINSTRATIVE BUILDING Y - - Y* Y Y Y

22 TIME OFFICE & SECURITY Y - - Y* Y - -

23 WORK SHOP BUILDING Y - - Y* Y Y Y

24 FIRE WATER PUMP HOUSE Y - - Y* Y - -

25 FIRE STATION BUILDING Y - - Y* Y Y Y

26 CLARIFIED WATER P/H Y - - Y* Y - Y

27 CHLORINATION PLANT Y - - Y* Y - -

28 PT PLANT Y - - Y* Y - -

29 CHEMICAL LAB Y - - Y* Y Y Y

30 SEWAGE TREATMENT Y - - Y* Y - -

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PLANT

31 PRESSURISING & HEATING P/H

Y - - Y* Y Y Y

32 FOAM PUMP HOUSE Y - - Y* Y - -

33 ACW PUMP HOUSE Y - - Y* Y - -

34 CW PH Y - - Y* Y - Y

LEGEND:ACN : AC Normal Lighting ACE : AC Emergency Lighting DCE : DC Emergency Lighting Y : YES Y* : YES, Only in control room, offices & toilets Y+ : YES, Only in MCC/Electrical room $ : Emergency Lighting Unit (ELU) + 5/15A Switch socket for ELU

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TABLE-II, AVERAGE LUX LEVEL & TYPE OF FIXTURES

S.NO.

LOCATION AVERAGEILLUMINATION

LEVEL REQUIRED (LUX)

TYPE OF LIGHTINGFIXTURES FOR AC LIGHTING

01 Turbine hall operating floor

200 HPSV High/medium bay fixture

02 Switchgear/ MCC rooms 200 Industrial trough type Fluorescent fixture with powder coated type reflector

03 Main Power House UCR/EER, ESP/VFD control room Control Rooms of all auxiliary plants.

350 Decorative, mirror optics, anti- glare, recess mounting

04 Offices, conference room 300 Decorative, mirror optics fluorescent fixture

05 Battery rooms 150 Totally enclosed, corrosion vapour proof, fluorescent fixtures

06 Transformer yard 20 (general) HPSV flood light weatherproof fixture50 (on eqpt.)

07 Boilers platforms, Bunker bay, Boiler/ESP Area

100 HPSV dust/vapour proof, well glass fixture with reflector

08 Pump houses, Auxiliary Plants Diesel Generator Room, Compressor Room etc.

150 HPSV medium bay/ Ind. trough type fluorescent fixture withPowder coated type reflector.

09 Cable galleries, Passage, Stair cases etc.

100 Industrial trough type fluorescent fixture with powder coated type reflector.

10 Fuel oil area, Hydrogen Cylinder room

150 HPMV/fluorescent, flame proof fixtures

11 Street lighting HPSV street light fixtureA Primary roads 20

B Secondary roads 1012 Outdoor storage &

unloading area handling20 HPSV, floodlight weather proof

fixture

13 All outdoor areas 20 (general) HPSV, floodlight weather proof fixture50 (on strategic

eqpt.)14

TG Building ground, 150 – 200 HPSV High/medium bay fixture

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mezzanine floor, and misc. floors

15Unloading and maintenance bay

20 HPSV, floodlight weather prooffixture

16Corridors, walkways 100 fluorescent fixtures

17toilets, wash rooms 80 fluorescent fixtures

18Elevator machine room 100 fluorescent fixtures

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TABLE IV, ABBREVIATIONS USED

ACLPs AC Lighting Panels

LDBS Lighting Distribution Boards

TPN Triple Pole with Neutral

ACELPs AC Emergency Lighting Panels

DCELPs DC Emergency Lighting Panels

DCDB DC Distribution Boards

LP Lighting Panels

UCR Unit control Room

ELU Emergency Lighting Unit

EER Electronic Equipment Room

DOP Degree of protection

HPSV High Pressure Sodium Vapour lamp

HPMV High Pressure mercury Vapour lamp

SLP Street Lighting Panels

WDB Welding Distribution Boards

2980282

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ANNEXURE-II

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