Date-22/12/2018 · floor and MDBFP - 0.0 M Floor. The provision as per bidding specification shall prevail. 7.9 Location of TDBFPs & MDBFP TDBFPs to be preferably located on operating

Vol Ch/Sec. Title page Clause

A. WATER TREATMENT SYSTEM

1 III Ch 33: Plant Layout Requirement

Plant Layout Requirement 9 of 15 33.4, Point no. 23

4 (SL. No.- B-75 page No. 16 0f 109 )- Clar04 (Layout)

Bidder understands mill arrangement shown in Plot Plan is indicative and alternate mill arrangements (Front or rear) can also be proposed by Bidder. Front mill arrangement i.e. between turbine building & boiler is widely accepted practice throughout the world & also accepted by NTPC & SEBs. Owner is requested to accept front mill arrangement as an alternative. Please confirm.

The provision as per bidding specification shallprevail.




Owner is requested to provide option of locating coal mills in front i.e between TG building and Boiler.

Acceptable/ agreed for bidder's proposal.




Bidder would like to propose that the coal mills will be located either in the side of the boiler or on rear side of the boiler i.e. between boiler and ESP or frint of the boiler i.e between Turbine & Boiler.

Agreed.

VII Floor Plan at El. 0.00 M, El. +8.5 M, +17.00M, +24.00 M -----

Tender layouts - 111-21-0200/300/400

4 (Sl . No.- S-15 Page 87 of 109 )

Clar04 (Layout)

In TG building GA drawing Unit#2 is shown adjacent to future unit i.e. towards North of Unit#1

VII Plot Plan Tender layouts - 111-29-0200 4 (Sl . No.- S-16 Page 87 of 109 )

Clar04 (Layout)

In Plot plan Bunker Unit#1 is shown adjacent to future unit.


Plant Layout Requirement 4 of 15 33.3 4 (Sl . No.- S-17 Page 87 of 109 )

Clar04 (Layout)

The proposed location of main plant block is indicated in the general layout plan enclosed with the bid documents however bidder has an option to develop his own layout keeping the location/orientation of the main power block, power evacuation corridor, make-up water corridor, Ash dyke same as indicated in bid document.

Bidder understands that location of main power block andlocation/orientation of BoP facilities can be modified by bidder including the re-location of future unit in order to have better constructibility, operatability and better system design/ performance. However the location of power evacuation corridor , make water corridor and ash dyke shall be maintained same as indicated in bid document.

Please Refer Amendment -04.


Plant Layout Requirement 2 of 15 33.1.1 2 (Sl . No.- N-14 Page 211 of 248 )Clar02 Civil

General layout plan indicating the available spaces for proposedproject is as shown in the tender drawing. It shall form the basis forfurther elaboration by the Bidder for the plant facilities, which are inhis scope.

As the proposed thermal power plant is a green field site, bidder understands that the location of various facilities (except railway siding and ash pond) shown in the tender plot plan are indicative and can be adjusted / relocatedas per bidder's layout. Please confirm.

Confirmed.

7 VII Floor Plan at El. 0.00 M, El. +8.5 M, +17.00M, +24.00 M -----

TG building floor plan - 111-21-0200/300/400/600

2 (Sl . No.- C-78 Page 67 of 248 )

Clar02 BTG Auxilaries and PG

Bidder understands that,Power house building width of AB & BC bay shown is indicative & same can be resized based on Bidder'sproposed layout and requirement. Please confirm acceptance.

Confirmed.


TG building floor plan - 111-21-0200/300/400/600

2 (Sl . No.- C-79 Page 67 of 248 )

Clar02 BTG Auxilaries and PG

Bidder understands that Length of Power house building and Grid interspacing is indicative, same can be resized based on layout requirement. Please confirm acceptance.

Confirmed.


Tender layouts 111-21-0200/300/400

4 (Sl . No.- S-18 Page 87 of 109 )

Clar04 (Layout)

Bidder understands that TG building GA comprising of building length, width (AB + BC), floor levels and location can be decided by bidder as per their layout. Also being an EPC bid, unit pitch will be decided as per bidder'sBoiler, ESP and TG building dimensions meeting the requirements of clear passage as per tender specification. Owner to please confirm.

TG building dimensions shown in the drawings are minimum and shall be maintained. Unit pitch details shall be submitted with technical offer for review.

10 III Ch 28: Cranes & Hoists

Cranes & Hoists 3 of 15 28.2.2 4 (Sl . No.- S-12 Page 86 of 109 )

Clar04 (Layout) point no. 12

Each crane shall be capable of lifting at least 110% of the weight of single heaviest component / equipment, including lifting beam and slings etc. to be handled in turbine hall for erection as well as maintenance of the equipment provided in AB bay. In addition, it shall also be possible to handle Generator Stator with tandem operation of two Turbine hall EOT cranes for which necessary arrangements shall be provided. In such case, the combined capacity of two EOT cranes shall not be less than the 110% of weight of Generator Stator, including the weight of lifting beam with swivelling arrangement and slings.

Bidder suggests crane capacity shall be selected with 105% of the weight of single heaviest component/ equipment including lugs, slings and lifting beam to be handled by TG hall EOT crane in tandem operation except generator stator.Generator stator can be handled with the help of Strand Jack arrangement in line with the recent tenders/projects under execution for super critical power plants in India.Please confirm.

The Provision as per bidding specification shallprevail.

We re-iterate that Generator stator can be handled with the help of Strand Jack arrangement in line with the recent tenders/projects under execution for super critical power plants in India.EOT capacity shall be selected with 105% of the weight of single heaviest component/ equipment including lugs, slings and lifting beam to be handled by TG hall EOT crane in tandem operation except generator stator.

Generator stator shall be erected with the help of Strand Jack arrangement. EOT Crane Capacity for TG building shall be 125/30 MT. Refer Amendement No.- 08 Sr. No.-07.

11 Vol-VI Ch 11 Building Description

Building Description 14 of 16 11.15.1 2 (Sl . No.- E 23- 264 Page 141 of 248 )

Clar02

The above capacity will be generated partially by excavating the area to a specified bottom level of the Reservoir and partially bythe formation of embankment with CI/CL type of soil obtained from excavation or from the borrow pit out side the plant area.Preferably, a RCC partition wall will be constructed to divide it into two compartments for cleaning of accumulated silt. Obviously each compartment of the Reservoir will be fed separately.

Earthen wall is shown in the raw water reservoir plan drawing within the tender plot plan drg no.111-29-0200, R0.Bidder shall consider partition wall of earthen embankment instead of RCC.Please confirm.

Partition wall not required.


Building Description 14 of 16 11.15.1 4 (Sl . No.- H-112 Page 232 of 248 )

Clar04

Raw Water Reservoir :Preferably, a RCC partition wall will be constructed to divide it into two compartments for cleaning of accumulated silt.

For Raw Water Reservoir divider bund is normally an earthen bund. Owner is requested to confirm this.

Bidder to comply with stipulation of Technical Specification.


Building Description 14 of 16 11.15.1 2 (Sl . No.- H-112 Page 232 of 248 )

Clar02

Plot Plan - Raw water reservoir Preferably, a RCC partition wall will be constructed to divide it into two compartments for cleaning of accumulated silt. Obviously each compartment of the Reservoir will be fed

No partiton is shown in the raw water reservoir layout mentioned in the Plot Plan. Owner to clarify whether it is mandatory for the Bidder to consider two compartments in raw water reservoir?

Two compartments to be considered as per Specification

14 Vol-VII Plot Plan 6 (Sl . No.- F-06 Page 13 )

Clar06

GIS - Switchyard Owner may please indicate outgoing line corridor in plotplan. This is required to finalise switchyard layout.

Shown in the revised Plot Plan No revise Plot Plan is received with Pre Bid Query Reply. SJVN to provide the revise Plot Plan.

Refer amendement No.- 08

2 (Sl . No.- C-41 Page 54 of 248 )

Clar02 BTG Aux & PG

Being an EPC tender location of TDBFP & MDBFP shall be as per standardpractice of the bidder.Please confirm acceptance.

Confirmed.

3 (Sl . No.- A-05 Page 01 of 78 )

Clar03 BOP Area Point no.5

Bidder proposes to locate TDBFP at intermittant floor (approx. 5.0M). Pleaseconfirm your acceptance.

TDBFP - Operatingfloor and MDBFP - 0.0M Floor. The provisionas per biddingspecification shallprevail.

7.9 Location of TDBFPs & MDBFPTDBFPs to be preferably located on operating floor and MDBFP tobe located on ground floor (0.0M)

There is discrepancy in SJVN's reply. Bidder understand that being EPC tender, location of TDBFP & MDBFP shall be as per standard practice of bidder.

Owner's Response Revised Statement of Clarification sought

Coal Mills shall be located either on the side of the boiler or on rear side of the boiler i.e. between boiler and ESP.

We understand that front mill arrangement is acceptable to SJVN.

Discrepancy in tender drawings. Owner is requested to confirm the unit numbering i.e. which unit unit needs to be considered as Unit#1.

15 Vol-III Chapter-2, Steam Turbineand its Auxiliaries

63 of 70 Location of TDBFP & MDBFP shall be as per standard practice of bidder

Confirmed.

Unit # 2 adjacent to future unit. Amendment-04 is silent on the stated point. We understand that being a green field project, Bidder can re-locate/ re-orientate plot plan facilities except railway siding, ash pond and power evacuation as per Bidder's layout. SJVN to confirm.

Statement of Clarification sought Owner's Response

There is discrepancy in SJVN's reply. We are proceeding as per Owner's response to Clarification02, Section- BTG Auxilaries and PG, Point number 78 and 79.

There is discrepancy in SJVN's reply. Bidder understands that there will be two compartments in the raw water reservoir and earthen mid bund shall be provided instead of RCC partition wall

EPC PACKAGEFOR

BUXAR THERMAL POWER PROJECT(2X660 MW)

PREBID CLARIFICATIONS-08

Front mill arrangement is acceptable.

Confirmed.

Power house building length, unit pitch and width of AB & BC bay shown is indicative & same can be resized based on Bidder's proposed layout and requirement. Number of maintenance bays as shown in the drawing shall be maintained. Bidder shall submit the tentative layout alongwith their proposal for review.

Sl.No.

Enquiry SpecificationClarification

raised by

OWNER CLARIFICATION

REEFRENCEBid Specification Stipulation

4

Date-22/12/2018

Page 1 of 42


1 Vol III Ch 21 Ash Handling System 27 of 52 Cl. No. 21.8.1 (a) Fluidizing pads with support structures, pipes, valves & fittings etc. shall be supplied & erected inside the APH and ESP hoppers.

Please note that as per our system design no fluidizing system is required for APH Hopper. Please confirm.

Confirmed.

2 Vol III Ch 21 Ash Handling System 28 of 52 Cl. No. 21.8.2.5

AHP Flow diagram :Dwg No. 111-13-

5202)

Common make up water & recovery water system Sheet: LP Water pumps - 1W+2S for two (2) units. 2W+1S LP water pumps

Bidder has found the discripency between these two clauses. Further, Bidder has considered 2 W + 1S LP pumps for both the units. Please confirm.

1 working per unit with 1 common standby LP Pumps shall be provided

3 Vol III Ch 21 Ash Handling System 30 of 52 21.8.3.1

21.8.3.2

3 x 100% duty Oil free Screw type Instrument Air Compressors -total (1W/unit + 1 S/B) complete with Intercoolers ……… shall be furnished for main plant area.

2x100% duty Oil free Screw type Instrument Air Compressors-total (1 W + 1S/B) complete with Intercoolers ………. shall be furnished forSilo area.

Bidder proposes 2W + 1 SB instrument air compressor for entire AHP. Please Confirm.

The provision as per bidding specification shall prevail.

4 Vol III Ch 21 Ash Handling System 31 of 52 21.9.3 Vacuum pump shall be sized for 60oC gas temperature and 36oC seal water temperature with gas as 100% dry basis. However motor capacity shall be suitable to handle same capacity of air at 240 deg C

Bidder understands that the same shall be read as 24 Deg C. Please confirm. Vacuum Pumps shall be sized considering seal water temperature of 36oC

5 Vol III Ch 21 Ash Handling System 33 of 52

4 of 52

21.10.1

21.2.4.2

Speed variation (+)10% to (-) 45% with respect to rated design point in case of ash disposal pumps for the subsequent stage through belt drive.

1st stage slurry pumps shall have scoop controlled Fluid Couplings to vary the duty point within (+) 20% to (-) 40% of design duty point.

Please note that two (2) different speed variations are specified in the two (2) different clause. Please confirm that actual requirement.

Refer clarification-02, S.No. E2-62 page 90 dated 29 Oct 2018


8 of 52

21.31

21.3.1

Free board – 700 mm

d) Four (4) RCC Fly Ash silos shall ……………………Free board of 1000 mm shall be maintained in the silo.

Bidder proposes 700 mm free board. Please confirm. Confirmed.


49 of 52

21.6.8

21.37

Two (2) (One for each unit) RCC overflow transfer sump lined with wear resistant plates to receive overflow water from weir box.

Material of Construction - Mild steel plates of thickness not less than 10mm (IS: 2062) and suitably stiffened with rolled steel sections.

Bidder has considered MS for bottom ash overflow tank. Please confirm. Confirmed.


2 of 52

21.40

21.2.3

Capacity - 20 M3 for each Buffer Hopper (one for each vacuum conveying stream)

Buffer Hoppers shall have a storage capacity of 30 M3 (minimum)

There is a discripency between two clauses.Bidder proposes 20 m3. Please confirm.

Refer clarification-02, S.No. E1-90 page 98 dated 29 Oct 2018

9 Vol III Ch 21 Ash Handling System Dwg No. 111-13-5202

6 of 52

flow diagram

21.2.10

vacuum pump drain is specified to discharge in to ash slurry sump

all the drains from BA hopper area, vacuum pumps area shall be discharged in to AHP clarifier

There is a discripency between two clauses.Please confirm the actual requirement.

Vacuum Pump drain shall be routed to AHP clarifier

EPC PACKAGEFOR

BUXAR THERMAL POWER PROJECT (2X660 MW)

PREBID CLARIFICATION-8

B. AHP-1

Owner's ResponseSl.No.

Enquiry Specification Bid Specification Stipulation Statement of Clarification sought

Date-22/12/2018

Page 2 of 42


EPC PACKAGEFOR






35 of 52

21.41, Data sheet – Slurry Disposal Line

Valves

21.11.3, Data sheet – Slurry Line Valves

a) Knife gate: 10 mm thk. MS: IS 2062 Gr A with 20 micron chrome plating on both sides

Gate - Stainless steel with min. 350-400 BHN Hardness on wear surface for knife edge gate valves (gate edge)

Please note that Two (2) different MOCs are specified for slurry line valves in two (2) difference clause.Please inform the MOC to be considered.

Stainless Steel shall be used

11 Vol III Ch 21 Ash Handling System 34 of 52 Data sheet of Recovery water pump

Vertical turbine Please accept Centrifugal type pum as well. Please confirm. The provision as per bidding specification shall prevail.

Date-22/12/2018

Page 3 of 42


VI Ch 16 Ash Pond Sheet# 1 of 2 Sl. No.- Q- 11 of Clarification 4 Page

82 of 109

Total ash produced in the plant at about 85% PLF will be disposed in the form of slurry by pumping into the ash disposal pond. The dyke around the storage shall be planned to be constructed in stages. The starter dykes around the storage pond shall have total storage capacity to store ash produces in 4(four) years of plant life. Keeping safety in regards to highest flood level in the plant area, the top level of the starter dyke should be kept at 64.00 m levelThereafter, the raising the dykes shall be in stages of 3 metre effective heightincrease (top of dyke in lower phase to top of dyke in higher phase). Theultimate dyke height shall be 12m.

VI Ch 16 Ash Pond Sheet# 1 of 2 Sl. No.- Q- 12 of Clarification 4 Page

82 of 109

….For developing storage capacity, one storage lagoon for Fly Ash disposal of 9 years (as per MOEF notification) by High Concentration Slurry Disposal (HCSD) system with sedimentation basin and one storage lagoon for disposal of 9 years (as per latest MOEF notification) bottom ash by wet slurry disposal system with one overflow lagoon for storing decanted water from above storage lagoons will be constructed. Outer Dyke will be constructed in two phases. In first phase, dyke will be constructed upto + 64.0 m level using earth as main construction material & after this dyke is filled upto freeboard level, in phase-II, raising will be done using pond ash). Since fly ash can act as impervious liner, therefore no liner is required for HCSD lagoon. Only bottom ash lagoon shall be linedwith impervious liner. Further, to start with only about 30 acres of land in one of the bottom ash lagoon will be provided with impervious liner and balance part of the bottom ash lagoon shall be lined by spreading high concentrated fly ash during initial stage of slurry disposal. This will act as liner. Provision for the extension of HCSD pipes from HCSD lagoon to Bottom ash lagoon shall be kept during the initial phase of the HCSD disposal........

EPC PACKAGEFOR



Owner's Response

1 Bidder will design ash dyke to store ash produced in 4 (four) years of plant life considering 100 percent fly ash utilization is to be achieved progressively within 4 years starting with 50% in 1st year and 70% & 90% in 2nd & 3rd year respectively of plant commissioning. For storage capcity of ash dyke, ash disposal in lean slurry will be considered. Bidder understands that HCSD system is not envisaged in this project accordingly referred cluase is to be amended. Please confirm.

HCSD Systme not envisaged. Ash disposal in lean slurry shall be considered.Starter dyke shall be constructed for 4 years ash generated while firing worst coal at TMCR for 2 units operating at 85% PLF and ash density as 1.4 T/M3. Bidder shall consider a free board of 1 M above the max. ash level.

Please confirm whether 100% ash generated for 4 years is to be considered ORAsh remaining after ash utilization as per MOEF guideline is to be considered for ash dyke design.

Sl.No.

Enquiry Specification Bid Specification Stipulation Statement of Clarification sought Owner's Response Bidder's Queries

100% ash generated for 4 years is to be considered for Ash Pond design

C. AHP

Date-22/12/2018

Page 4 of 42

Sr. No. Clause No. Page No. Bid Specification Stipulation Statement of Prebid query & clarification Owner's Response

1

Vol. V: PART B Ch 17 17.02.04.05 Page 4 of 32 All instruments and control equipment supplied against this contract shall befactory calibrated at least at five (5) points through out the range and checkedfor their functional/performance requirements. The instruments shall also becalibrated at site prior to commissioning.

Bidder wants to claify that 5 point calibration is not applicable for all instruments & control equipment. 3 point calibration shall also be considered. Clarification noted . Specific issue if any, will be considered during

contract finalisation stage.

2 Vol V Part A Notes : Point No. 10 Page 58 of 100 10. The GIU is applicable only in case of IDCT. Bidder understand that GIU is needed only for IDCT area. Confirmed.

3Vol. V: PART B Chap 23 23.01.04 Sheet 04 of 22 Electronic control modules of plug-in type shall be removed from equipment racks after

factory check-out and individually packed for shipment.Bidder wants to clarify that same will as per OEM transport/shipping practice which will be submitted before shipment of such modules.

Bidder to follow the Tender specification requirements. However, if any specific issue is there, the same shall be taken care during contract finalisation stage.

4Vol. V: PART B Chap 23 23.02.03 Sheet 09 of 22 All tubings and fittings shall be of 316 SS as a minimum. Bidder wants to clarify that tubings & fittings material will be as per process

temperature & pressure as SS316 is not recommened for 600 degree temperatures & above.

Bidder to follow the specification requirements. However, if any specific issue is there, the same shall be taken care during contract finalisation stage.

5Vol. V: PART B Chap 23 23.02.03 Sheet 11 of 22 For successful functioning of the instruments, any changes from standard

hook-up diagrams (attached with this specification) shall be done by bidder without any extra cost implication.

Bidder wants to clarify that same shall be done as per approved Hook Up drawings.


6 Vol. V: PART B Chap 23 23.02.03 Sheet 14 of 22 Broken, stolen or lost components shall be replaced by the bidder. Bidder wants to clarify that same will be done for components under Bidder scope storage & facilities. Bidder understanding is correct.

7

Vol. V: PART B Chap 23 23.03.01 Sheet 19 of 22 The testing and commissioning tool shall be used for trial run/test operation of any drive in absence of DDCMIS/DCS/PLC during initial trial run and commissioning. While the tool shall be used for all type of drives envisaged in the technical specification, it is designed to be operated for one drive at a time.Minimum 2 no’s Portable trolley mounted system completed with necessary hardware like controller, I/O cards, relays, power supply modules, display etc.for operating the drives and monitoring its parameter shall be supplied by Bidder

Bidder want to clarify that DDCMIS/DCS/PLC will be available for trial runs if in case not, temporary arrangement for same can be made at site. Special Trolley arrangement is not envisaged.

Bidder to follow the Tender specification requirements.

8 Vol. V: PART B Chap 22 22.07.07 Sheet 12 of 25 Owner reserves the right to call for samples if considered necessary and the same shall be submitted by the Bidder free and without any obligation.

Bidder want to clarify free samples will be as per PA system vendor industry & company policies so that no compliance issues is there. Bidder to follow the Tender specification requirements.

9Vol V Part A LIST OF OWS

STATION PER UNITSheet 27 of 100 OWS in C&I Lab Bidder needs clarification for purpose & what softwares will be needed.

Softwares for C&I lab will be uploaded accordingly as per requirement of lab.Calibration and maintenance software required for C&I lab equipments to be confirmed. For details please refer clause 10.01.08 &09 : Volume V . Part B , Chapter 10.

10

Vol V Part B Chap. 10 Maintenance and Calibration Equipment-10.01.02

Sheet 2 of 46 Electrical power supply requirement of the instruments offered under this Subsection shall be UPS, 230 V AC, 50 Hertz nominal, single phase.

Bidder need to clarify that power supply will be as per need of M&C lab instruments. Main supply will be 24VDC or 230VAC further conversion will be done in equipment itself.

The power supply rating of any equipment supplied under this package shall be 230VAC UPS supply, prefrably. However, specific issue if any will be considered during contract inalisation stage. Bidder to arrange equipments considering the same.

11Vol V Part B Chap. 10 Maintenance and

Calibration Equipment-10.01.06

Sheet 2 of 46 Dustproof carrying case and rechargeable battery along with external charger shall be provided with all equipments.

Bidder needs to clarify that dust proof case & recharheable battery with external charger will be provided as per requirement of device. Bidder to follow the Tender specification requirements.

12Vol V Part B Chap. 10 Maintenance and

Calibration Equipment-10.01.06

Sheet 2 of 46 All the calibration instruments shall be provided with RS232C port for Lab WORKSTATIONS interface with their own interfacing cables & software.

Calibration instruments will have have communication port for interface but not necessarily RS223C


13

Vol V Part B Ch. 16 16.06.00- Cameras - iv - Camera Housing

Sheet 10 of 17 All the cameras and accessories are to be housed in Weather Proof environmental housing made of aluminum. The housing with heater and blower installed should provide protection for camera/lens assemblies in the ambient temperature range of (-) 10 deg. C to 60 deg C.

Bidder request requirement of heater & blower is not envisaged as camera is capable to work in outdoor location from (-) 10 deg. C to 60 deg C. Bidder to follow the Tender specification requirements.

14Vol V Part B Ch. 16 16.06.00- Cameras - iv -

Camera HousingSheet 10 of 17 The housing should also have thermostatically controlled heater kit, continuous duty blower

kit, purge air arrangement, Window wipers available within the housing.Bidder request requirement of heater, blower & wiper is not envisaged as camera is capable to work in outdoor location from (-) 10 deg. C to 60 deg C. Bidder to follow the Tender specification requirements.

15 Vol V Part B Ch. 16 16.06.00- Cameras - iv - Camera Housing

Sheet 10 of 17 The camera for FOPH and Fuel oil tank area shall be explosion proof type and for CHP area, camera shall be flame proof type only.

Bidder request to clarify that explosion proof & flame proof camera requirement is not envisaged. Bidder to follow the Tender specification requirements.

16

Vol V Part B Ch. 16 16.05.08 Sheet 8 of 17 The software for clients shall preferably work on a browser based system .Thiswill allow any authorized user to display any video (live/recorded) of any camera on the monitor with associated controls. It shall be possible to play back recorded video at different speeds i.e 1/4X to 16 X. The system shall support multiple live video on single monitor in different configurations like 1,2,4 etc.

Bidder request to accept Playback speed to 8xBidder to follow the Tender specification requirements. The technical requirement shall be met by any CCTV System supplier / system integrator.

17

Vol V Part B Ch. 05 5.03.02 Sheet 4 of 17 Two nos. racks shall be provided by the bidder for mounting primarycoolers and high pressure reducing elements in the field along with allrequired piping, fittings, and accessories. The exact grouping and locationof these racks shall be as finalised during detail Engineering stage.

Bidder needs to clarify that one number of rack is sufficient for Primary cooler for one sample line. Bidder to follow the specification requirements. However, if any specific

issue is there, the same shall be taken care during contract finalisation stage.

18

Vol V Part B Ch. 05 5.03.06 Sheet 6 of 17 All critical components like sample coolers, PRV, sample shutoff valves,blow down valves, thermal shutoff valve, sample relief valves, shell reliefvalves and all type of fittings on sample lines etc shall be of Sentry, Loweor Dr Thiedig make only.

Bidder request to accept other proven makes also & not for three particular makes. Bidder to follow the specification requirements. However, if any specific

issue is there, the same shall be taken care during contract finalisation stage.

19 Vol V Part B Ch. 05 5.03.08 Sheet 7 of 17 All the flow switches shall be wired to the remote I/O cabinet (situated inSWAS room) by the bidder.

Bidder want to clarify that flow switch will be connected to BOP DDCMIS & no RIO is situated in SWAS Room. Bidder clarification noted.

20Vol V Part B Ch. 14 Annexure A

1a - RemarksSheet 1 of 10,3 of 10,4 of 10.

(Operation in case of emergency situation). Bidder want to clarify as per specification chapter 18- connectivity will be provided via soft link (OPC) for monitoring at CCR & operation from respective LCR.

Bidder to note that the Normal operation is from LCR and under emergency conditions the operation is from CCR , BOP DDCMIS also to be envisaged by the Bidder .

21Vol V Part A Part A LIST OF OWS

STATION PER UNIT - Note

Sheet 27 of 100 In addition to above OWS, OWS & printers specified elsewhere in the specification, and ref Table ------- , of this section of the specification shall also be provided by bidder.

Bidder want details of the table which is left blank. Quantities of OWS, EWS, Printers etc shall be as per the Tender drawings and the tender specfication.

22Vol V Part A Various List & Quantity Bidder want to clarify that for quantity & Lists Part A is to be considered. For the Bidding purpose tentative quantity can be considered based on

PART A. However, if any difference in quanity is derived during detailed engineering stage, the same shall be as per Owner approval

Section/Part/Chapter/Volume

D. C&I

D1.

EPC PACKAGEFOR



Date-22/12/2018

Page 5 of 42

S. No. Volume Section/Part/Chapter/Volume Clause No. Page No. Bid Specification Stipulation Statement of Prebid query & clarification Owner's Response

1 Vol V Part A ESP Bidder wants to clarify that ESP PLC shall be connected with FGD DCS for control & monitoring purpose. Please confirm.

ESP PLC shall be connected to DDCMIS and FGD DCS shall be connected to DDCMIS . In addition to this , if Bidder wish to connect ESP with FGD DCS, the same can be done optionally.

2 Vol V Part B Part B Ch. 22 22.07.01 Sheet 10 of 25 Telephone Sets Quantity of X, Y & Z type telephone set is considered as 16, 8 & 8 respectively as per clause 22.02.01.01 TELEPHONE SYSTEM, sheet 3 of 25 of chapter 22. Please confirm bidder understanding.

Total quantity shall be 250 nos. as per Cl. 22.02.01.01 (b). Bidder to note that Provision of expansion of the system upto 400 lines with min 16 P&T, 8 Digital and 8tie lines shall be considered.

3 Vol V Part A Point 6 Sheet 36 of 100 CONTRACT QUANTITIES OF PA SYSTEM

Bidder want to clarify that separate MC is not required for CHP area & same can be done from Unit MCU as CHP area is not very far from main Unit. All desired features for PA system will be achieved. Please confirm.

Bidder to follow the Tender Specification.

4 Vol V Part b Ch. 22 22.13.01.02 Sheet 18 of 25 Communication within a zone.

During conversation on page' mode within a zone, the centralised equipment/hardware of the associated zone shall have the feature to monitor and identify the handset from where conversation is being continued with the 'page' button depressed and the access code of the person.

Following clause shall be modified to zonal level not person level i.e. During conversation on 'page' mode within a zone, the centralised equipment/hardware of the associated zone shall have the feature to monitor and identify the zone/area from where conversation is being continued.We hope owner understand bidder understanding.

Bidder to follow the specification requirements. However, specific issue if any shall be taken care during contract finalisation stage.

D2.

EPC PACKAGEFOR



Date-22/12/2018

Page 6 of 42

Sr. No. Section/Part/Chapter/Volume Clause No. Page No. Bid Specification Stipulation Statement of Prebid query & clarification Owner's Response

1 Vol V, Part A 3.02.00 sheet 60 of 100 a. BFP Drive Turbine-A blockb. BFP Drive Turbine-B blockc. Balance control implementation

Bidder would like to inform, For STG integral control OEM Proprietary Control system will be provided for rest BFP Drive Turbine-A&B and balance control implementation will be provided in BOP - TG block. Please accept.

Please comply with Tender specification . However, during contract finalisation stage specific design related issues if any, will be discussed and finalized.

2 Vol V Part B chapter 14 Point 7 Sheet 4 of 10 CW Chlorination System, Chemical dosing and Sulphuric Acid Dosing System

As per Vol V - chapter - 14 - point 7 : CW Chlorination System, Chemical dosing and Sulphuric Acid Dosing System needs to be controlled from PLC while as perVol III - Chapter 17 - sheet 6 of 18 - section 17.5 :OPERATION AND CONTROL PHILOSOPHYit is to be controlled from Water system DDCMIS.

Also for Hydrogen generation Vol III ch. 37 clause 37.2.1 says for PLC but as per Vol V - chapter - 14 - point 13 ask for DCS. In clarification it is confirmed for both DCS & PLC.

For HVAC : Microprocessor Based System/PLC is considered by Bidder. Please confirm

Similarly for ETP Vol III ch. 38 clause 38.5 asks for DCS while Vol V chapter 14 point no. 9 ask for PLC.Bidder consider chapter 14 for consideration of Control system basis i.e. PLC/DDCMIS etc.

Separate PLC shall be provided for CW Chlorination, RW Chlorination, ETP and Hydrogen Generation Plant.

For HVAC, Microprocessor Based System/PLC is acceptable.

3 Vol V Part B/Ch 3/DDCMIS 3.44.04 46 of 85 e) Digital/Electronic Over speed protection & Monitoring systemshall be provided with TMR configuration. This system shallcomply the requirements of latest edition of IEC 61508, IEC61508, SIL3, API 670 and API 612 requirements. System shallbe SIL 3, TUV certified only.

Bidder understand that TPS will be provided with TMR configuration. Same practice is followed in executed project like Ghatampur.


4 Vol V Part A CONTRACT QUANTITIES FOR SWAS PER UNIT

42 of 100 Analyzers for measuring conductivity (Specific & Cation), pH, Hydrazine, Silica, Sodium ion, Chloride, Dissolved Oxygen and for any other process parameter etc.

Bidder want to inform that as per PART-A - Contract quantity for SWAS analysers per Unit : Chloride analyser is not envisaged for (CPU Outlet & Condenser CW) as we are not using sea water.


E. C&I (ADDITIONAL)

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Date-22/12/2018

Page 7 of 42

Vol Ch/Sec. page Clause

Volume-II-Generals & Schedules

Ch 8 : FunctionalGuarantee &LiquidatedDamages

29 of 78 5.11 No fuel oil support shall be required above 35% BMCRContractor shall guarantee that oil support for flame stabilizationshall not be required beyond 35% of BMCR load when firing thecoals from the range identified. The Contractor shall demonstratethat with any combination of mills/ adjacent mills in service (toEmployer's choice) the Steam Generator does not require any oilfiring for stable and efficient boiler operation at and above 35%BMCR loads.

Volume IIIMechanical Works

Section 2 : DesignBasis of SG &Auxiliaries andSCR/Ch 1: SG &Auxiliaries

4 of 120 2.1.8 Minimum Load without Oil Support for Flame StabilizationThe design of Steam Generator shall be such that it does not callfor any oil support for flame stabilization beyond 40% BMCR loadwhile firing any coal from the range specified, with any combinationof mills / adjacent mills (to Employer's choice) in service.


Section 2 : DesignBasis of SG &Auxiliaries andSCR/Ch 1: SG &Auxiliaries

14 of 120 Note: 12. vii. vii. Min. load without oil support: 40% BMCR with any range of coal specified

2 Volume IIIMechanical Works

Ch 1: SG & AuxiliariesSection 2 : Design Basis ofSG & Auxiliaries and SCR

8 of 120 2.1.16. Note Sl No.- B-08 Page 6 of 109 clarification No.- 04

iv. Upto & including 610 degree Celsius (*):Alloy steel ASME SA-335:P-92/T-92 or approved equivalent. (*) Bidder may use ASME SA-335: P-92 or approved equivalent material up to610°C for the components which are outside the flue gas path forSuperheater, Reheater tubes, headers and interconnecting piping asapplicable. In case it is proposed by the bidder to use ASTM-A-335 P-92 or equivalent material, Bidder shall be required to furnish operating references.

Bidder proposes to use ASME SA-335: T-92 material beyond design metal temperature of 610 deg C and up to temperature within permissible limit as per code for SH/RH terminal tubes (i.e. from header to coil) that are outside flue gas path. T92 and P92 materials has been used for components beyond design metal temperature of 610 deg C which are outside flue gas path in similar installations of GE Boilers which are running successfully without any operational issues.

The provision as per bidding specification shallprevail

Bidder at his discretion can use ASME SA-335/213:P-92/T92 or approved equivalent material for the components which are outside the flue gas path for Superheater, Reheater tubes & headers and Interconnecting Piping.

In case ASME SA-213:T-92 is used for terminal tubes (i.e. from header to coil) for ease of welding, than such tubes can also be used beyond design metal temperature of 610 oC and up to temperature within permissible limit as per code, only if it is unavoidable.

This is as per the latest tender specs from Central Power Utilities

Confirmed.



10 of 120 2.1.22. ii) Design pressure of the Steam Generator pressure parts shall be atleast 1.05 times the maximum operating pressure, or as required by IBR/ASME, whichever is higher. Further, design pressure of the Steam Generator pressure parts upstream of Separators shall be atleast 1.05 times the maximum operating pressure, or as required by IBR/ASME, or Pressure arrived based on lowest set pressure of spring loaded safety valve on the separators plus the pressure drop from separator to the respective pressure part; whichever is higher.



17 of 120 2.5. c) Design Pressure1.05 times the max. operation pressure or highest set pressure of the spring loaded safety valve for full discharge whichever is higher



11 of 120 2.1.22. iv) The working fluid temperature to be considered for design of boiler tubes, headers, separators and other pressure parts upto first stage of attemperation shall be arrived by adding an additional margin of minimum 40 deg.C to the maximum predicted/expected fluidtemperature in these pressure parts or plus the margin as per IBR whichever is higher.



17 of 120 2.5. STEAM SEPERATOR(S) b) Design Temperature Maximum fluid temperature plus 40°C (Min.) or max fluid temperature plus the margin as per IBR, whichever is higher.

Clarification refernce Bid Specification Stipulation Statement of Clarification sought Owner's response

F. WATER TREATMENT SYSTEM

Owner's Response Revised Statement of Clarification sought Sl.No.

Enquiry Specification

3 Sl No.- B- 10 Page 6 of 109 clarification No.- 04

Design pressure of the Steam Generator pressure parts will be atleast1.05 times the maximum operating pressure, or as required byIBR/ASME, whichever is higher. IBR allows setting up of safety valves above the design pressure for Supercritical boilers.

The provision as per bidding specification shall prevail

The Design Pressure of the steam generator pressure parts shall be atleast 1.05 times the maximum operating pressure or as required by IBR/ASME whichever is higher. As Per IBR Amendemnt, Regulation 380 allows to have set pressure of safety valves above the design pressure for supercritical boiler.

Central Power Utilities has allowed to de-link the safety valve set pressure for design of pressure parts upstream of Safety valve

1 Sl No.- A-10 Page 3 of 248 clarification No.- 02

There is a contradiction in minimum load without oil support for flamestabilization in different clauses of the tender document.Bidder has considered no fuel oil support above 40%BMCR. SJVN/DESEINto confirm.

Read as 35% BMCR isminimum load for no fueloil support for guaranteeparameter

Bidder would like consider no fuel oil support upto 40% BMCR as per the Bidder's technology

4 Sl No.- B- 12 Page 6 of 109 clarification No.- 04

The working fluid temperature for design of boiler tubes, headers, separators and other pressure parts upto first stage of attemperation will be arrived as per IBR only. No additional margin of minimum 40 deg.C to the maximum predicted/expected fluid temperature.


The working fluid temperature to be considered for design of pressure part tubes starting from bottom ring header upto and including the waterwall outlet headers shall be arrived by adding an additional margin of minimum 40°C to the maximum predicted/expected fluid temperature in these pressure parts. The working fluid temperature to be considered for design of pressure parts starting from downstream of waterwall outlet headers upto first stage of superheater attemperation shall be arrived by adding an additional margin of minimum 15°C to the maximum predicted/expected fluid temperature in these pressure parts.

This is as per the latest spec requirement from Central Power Utilities

EPC PACKAGEFOR



Refer Amedement No.- 08 Sr. No.- 06.

Confirmed .

Confirmed.

Date-22/12/2018

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Vol Ch/Sec. page ClauseClarification refernce Bid Specification Stipulation Statement of Clarification sought Owner's responseOwner's Response Revised Statement of Clarification sought Sl.

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21 of 120 2.7.2. Sl No.- B- 24 Page 8 of 109 clarification No.- 04

1. Heating surfaces arrangements g) The first bank of coils in the second pass (in case of two pass boiler) shall be located at least 2 meters below from the second pass gas entry zone to minimise erosion.

The first bank of coils in the second pass (in case of two pass boiler) shall be located at start of second pass gas entry zone. To minimise erosion, the leading tubes will be provided with erosion shield. Similar installations of GE Boilers are running successfully without any operational issues.


Bidder woulld like to mention again that we will provide erosion shields to protect the tubes from erosion.

Bidder has a lot of references with the design begin offered

This requirement is a first of a kind and is over and above the requirements of Central Power Utilities.

Kindly relook into this again

The first bank of coils in the second pass (in case of two pass boiler) shall be located at start of second pass gas entry zone.




10. Space Provision b) Additional space of atleast 5% for SH and RH coils area shall envisaged.

10. Space Provision b) Additional space for SH & RH coils area is not be envisaged as we have references of our past proven projects without additional space of SH & RH


Bider will provide Additional space of 5% of convective area of SH and RH coils will be provided.





Each fan to be sized for 60% BMCR load (one stream in operation) calculated taking into account following factors occurring together:(g) Pressure drop through SCR system : 150 mm WC or actual, whichever is higher(i) Pressure drop through FGD System : 200 mm WC or actual, whichever is higher




Each fan to be sized for 50% BMCR flow calculated taking into following conditions occurring together:(9) Pressure drop through SCR system : 150 mm WC or actual, whichever is higher(11) Pressure drop through FGD System : 200 mm WC or actual, whichever is higher



60 of 120 2.13.1.1. Sl No.- B- 36 Page 10 of 109 clarification No.- 04

Duct Sizing Criteria: ii) The velocities in the ducts shall not exceed the above limits under the following conditions, all occurring together: (b) 25% excess air over and above the stoichiometric air at economizer inlet. (d) Design ambient temperature and relative humidity as specified. The above velocities shall not be exceeded even in case of operation with one stream of ID, FD, PA fans and air heater operation at 60% of BMCR load.

Duct Sizing Criteria: ii) The velocities in the ducts shall not exceed the above limits under the following conditions, all occurring together(b) 20% excess air over and above the stoichiometric air at economizer inlet. (d) Design ambient temperature of 27 degree Celsius and 60 % RH. All the ducts will be sized for two stream operations. No Single stream opertion for duct is envisaged.

Boiler design is based on 20% EA or more. All Auxiliaries to be sized based on as per bidding Specification.

Bidder understands that Boiler design will be based on 20% EA which inlcudes Superheater, Reheater and Economiser.

We again request inline to the Boiler design, Duct design should also be based on 20% Excess air.

Shall be decided during detailed engineering



7 of 120 2.1.12.3 Sl No.- B- 05 Page 05 of 109 clarification No.- 04

Irrespective of the fact that HP-LP bypass system is provided for smooth start-up, fast loading & house load operation of unit, the steam generator shall also be capable of start-up without HP-LP by-pass system in service.

Boiler start up without HP-LP bypass in operation shall lead to dry run of reheater elements at an elevated flue gas temperature which is not recommended as per Bidder standard practice. We have considered boiler start up with HP-LP bypass sytem in operation for smooth operation of boiler during start up period and avoid damages to reheater section.


Boiler start up without HP-LP bypass in operation shall lead to dry run of reheater elements at an elevated flue gas temperature which is not recommended as per Bidder standard practice. We have considered boiler start up with HP-LP bypass sytem in operation for smooth operation of boiler during start up period and avoid damages to reheater section.

Confirmed.



19 of 47 1.1.15.12 Sl No.- B- 100 Page 19of 109 clarification No.- 04

On line fuel measurement facility for accurate measurement of coal mass flow rate/ air fuel ratio in each pulverized fuel (PF) pipe for each coal pulverizer. The equipment shall comprise of sensors working on micro wave technology. The error in measuring system shall not be more than 5%,which shall be demonstrated by comparisons with isokinetic measurements

As per Bidder standard proven practices, Fixed Orifice is provided at the Mill outlet pipes and no online mesurement is not envisaged. However Rota probs, Dirty Pitot tubes will be provided.


Bidder would like to inform that as per the proven practices, Fixed Orifice is provided at the Mill outlet pipes and no online mesurement is not envisaged. However Rota probs, Dirty Pitot tubes will be provided.

The reliability and capability of the Online measurement devices are also not known and the number of vendors is very limited. Hence measurement using microwave technology and variable orifice, etc., is not envisaged.

This has been agreed by Central Power Utilities

Refer Amedement No.- 08 Sr. No.- 04

7 For ID fan sizing, bidder proposes to consider pressure drop across SCR and FGD as 60 mmWC and 80 mmWC respectively at 60% BMCR load(one fan in operation). We understand that same shall be sufficient as there shall not be any single stream operation of SCR and FGD at 60 % BMCR load case.


For 60% MCR , each SCR reactor will be sharing 30% load. Hence, the pressure would be much lower as compared to 50% BMCR in the clause mentioend below.

Bidder will suggest the customer to modify the pressure drop in 60% load case to a lower value or follow the pressure drop suggested in our clarification

The pressure drop through SCR for other than 50% loads shall be decided as per characteristic curves

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30 of 120 2.9.1 Sl No.- A- 18 Page 07 of 248 clarification No.- 02

ii. 1x100% independent air motor drive, with its gear box and automatic clutching, declutching facility for rotation during non-availability of A.C drive system.

As per bidder standard practice, common gearbox is provided for AC Motor and Air Motor with automatic clutching and declutching arrangement.


Agreed



48 of 120 2.10.8.13 Fan housing shall be designed for ease of maintenance and access to the fan wheel or impeller. The casing shall be split type to provide easy removal of the fan wheel or impeller for replacement and repairs. The casing section shall have gasket joints to ensure air-tight sealing



59 of 120 2.12.9 i) The fan casing shall be split to provide easy removal of the fan hub/impeller for replacement and repairs.



72 of 120 2.15.2 Sl No.- G- 146 Page 196 of 248 clarification No.- 02

Soot Blowing System shall bei) Fully automatic sequentially controlled through SG C&I control system. ii) Capable of effectively removing deposited ash from Steam Generator heat transfer surfaces with on load cleaning devices.iii) The soot blowers shall be capable of selective operation in areas of ash deposition (SMART) type or equivalent.

As per GE Standard and Proven practices, the Complete Soot blower system shall conventional system and is Controlled from the DCS. No SMART soot blowing system is envisaged.


Bidder would like to state that the frequency of Soot Blowing can always be changes based on various Metl Temp Probes placed at suitable locations as per Operator's discretion and as such Smart Soot Blowing system is not required.

Confirmed.



43 of 47 1.13.7.1 (iv)(b)Sl No.- A- 38 Page 16 of 248 clarification No.- 02

Catalyst De-dusting System:In addition to steam type soot blowers, bidder to provide additional Sonic horns & Air Cannons for each catalyst layer (including future layer)

As per bidder standard practice the catalyst de-dusting system is combination of rake blower and Sonic horns shall be sufficient for catalyst cleaning. Hence, air cannon system shall not be envisaged.Catalyst de-dusting system shall be provided for initillay installed catalyst layer only.For Future catalyst layer, the provision only shall be provided on reactor.

The provision as per bidding specification shall prevaAgreed. Either rake type steam soot blower or sonic horn and air cannon shall be used for Catalyst De-dusting

Confirmed.



44 of 47 1.13.7.1 (vii)(bSl No.- A- 40 Page 17 of 248 clarification No.- 02

Contractor’s scope shall also include conductance of laboratory/shop test to establish and demonstrate the activity of the catalyst selected for Indian coal/ash. Further, such test shall be conducted and report shall be provided to customer before supply of catalyst to site.

The catalyst shall be selected based on supplier experience and proven practice similar to indian coal. The conductance of such abrasion/erosion test at laboratory/shop is not a practice and shall not be feasible.

The provision as per bidding specification shall prevaNot Feasible to conduct test particular for coal type.Catalyst shall be selected on proven design as per the executred experience from the supplier.

Earlier test reports with Indian coal can be submitted



45 of 47 1.13.10 (ii)(f) Sl No.- A- 43 Page 18 of 248 clarification No.- 02

2x100% Glycol-water recirculation pumps with common water/ glycol heater for each ammonia vaporizer and common overhead make up water/glycol tank.

The selection of vaporizer type shall be as per CCoE approved type and supplier standard design practice based on proven technology in the past. Bidder/supplier is preferred the direct steam heating NH3 vaporizers (in-direct type) based on many years of industrial experience and which has no moving parts (No maintenance required).Hence, all relavent sections of these requirements will not be considered.

The provision as per bidding specification shall prevaBidder would like to inform that supplier has no experience on Glycol/water circulation system for vaporizer.

Since the Vapoizerization of Electrical / Steam / Water Bath type works equally good and supplier has a lot of experience with this type of heating, customer is requested to look into this.

Bidder shall consider either glycol based / water based / direct steam heating



89 of 120 2.21.14 (3)(ii) Sl No.- A- 92 Page 30 of 248 clarification No.- 02

The upper edge of the catalyst shall be hardened tominimize ash erosion.

Hardening of the upper edge is applicable only for Honeycomb catalyst and not applicable for Plate type catalyst. Hence hardening of the upper edge of catalyst is not done for plate catalyst.

The provision as per bidding specification shall prevaAgreed. Agreed.



92 of 120 2.21.14 (3)(xv)Sl No.- A- 94 Page 31 of 248 clarification No.- 02

In situ measurement of catalyst activity shall also be envisaged. There is no such analyser or technology available in market to measurecatalyst activity in-situ. Hence this is not envisaged

The Bidder shall have the facility to perform the sample lab.test twice/year at site.

In situ catayst activity tests is not be possible. Bidder wants to assure the customer that tests in the catalyst suppliers’ lab shall be performed from the extract of sample catalyst elements from during the catalyst life.

Confirmed.



108 of 120 2.21.11 (1) - Sufficient numbers of ammonia resistance balls shall be supplied to cover the top surface of dyke to minimise ammonia evaporation from the dyke.

- - Ammonia/water will be collected in the dyke only during the seapage or leakage and defogging period in the storage tank area. Moreover, ammonia has great affinity with water. As this condition will occur once in a while, Ammoia resistance balls are not required.

Confirmed.



116 of 120 2.21.23 (B)(9) Sl No.- B- 130 Page 23 of 109 clarification No.- 04

Ammonia Slip after last catalyst layer (ppm at 6% O2 on dry basis) < 2 for guarantee & design.

Ammonia Slip after last catalyst layer (ppm at 6% O2 ondry basis) < 3 for guarantee & design as specified in the tender specification Nox guarantee clause Volume II.

The provision as per bidding specification shall prevaThere is a contradiction in ammonia slippage value among different clauses in the tender document. Hence bidder has considered ammonia slip not exceeding <3ppm in all the respective tender clauses. Please confirm.

Ammonia slippage value shall be less than 2.5 ppm for guarantee and for design

12 Sl No.- A- 77 Page 27 of 248 clarification No.- 02

Fan housing shall be designed for ease of maintenance and access to the fan wheel or impeller. The casing May be split type or rolling diffuser / inlet box for onsite maintenance to provide easy removal of the fan wheel or impeller for replacement and repairs as per OEM's proven practice.


Agreed

Agreed

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21 of 47 1.1.17.1 - v) Fully gas tight, motor operated, gates at each hot air & cold air duct tothe mills, before and after each ESP stream, before and after each IDfan, at inlet to each of RAPH on flue gas side, at discharge of each PAfans, FD fans and at each economiser bypass duct. Fully gas tight,pneumatic operated, gates at each hot air & cold air duct to the mills.Gas tight double multilouver (Bi-plane) damper before and after of eachRAPH on air side.



66 of 120 2.13.2.1 - 2.13.2.1. Power operated gas tight isolation dampers along with their drives shall beprovided at all locations required for carrying out internal repair andmaintenance of pulverizers, electrostatic precipitators and induced draft fanswhen the Steam Generator is on load. As a minimum following locationsshall be provided with power operated gas tight dampers/gates:i) In each hot air and cold air duct to each of the mills (pneumaticallyoperated).ii) On each inlet and outlet to each ESP stream (there being at least sixESP streams, with twelve inlets and outlets)iii) Before and after each I.D. fan.iv) At inlet to each of the Regenerative Air Pre-Heaters on flue gas side.v) After each of the Regenerative Air Pre-Heater, SCAPH bypass duct &after each SCAPH on airside.vi) At discharge of each of PA.vii) At discharge of each of FD fans.viii) At each economizer by pass duct, Each SCR inlet duct, each SCR outletduct (only incase of Bi-sector APH) & each SCR bypass duct.

2.13.2.4. Type of power operated gas tight dampers at various locations shall be asfollows:i) Guillotine Gate Type at locations Cl. no. 2.13.2.1 (i), (ii), (iii), (iv), (vi),(vii) and (viii).



23 of 47 1.1.20 - Galleries, Walkways, Roofing, Platformsi) Galleries, walkways, platforms, staircase, hand rails, ladders andgratings etc. as specified shall be provided at the Steam Generatorfloors including the interconnecting platforms between the SteamGenerator floors and main building at four (4) elevations on either sideof boiler (excluding ground floor) and between the Steam Generatorand bunker buildings at four (4) elevations on either sides of eachSteam Generator as per the details given in the Technical Specification.Number of inter-connecting platforms between Boiler and Coal Bunkerbuilding for each level / floor shall be two (2) numbers on each side ofBoiler i.e. four (4) numbers per elevation.

i) Interconnecting platform between TG builiding and Boiler will be provided at two elevations only(i.e., Operating floor & mezzanine floor). Each elevation will have both LH and RH side access.

ii) Interconnecting platform between Boiler and Bunker building will be provided at three elevations only(i.e., Mill Maintenance floor, Feeder floor & Tripper floor). Each elevation will have both LH and RH side access.


ii) For the Front Milll arrangement, Interconnecting platform between Boiler and Bunker building will be provided at three elevations only(i.e., Mill Maintenance floor, Feeder floor & Tripper floor). Each elevation will have both LH and RH side access.

Confirmed.



40 of 47 1.10.1 - CRANES AND HOISTCranes for Mill handling, Compressed air system equipment andFuel Oil system equipment, Mill maintainenance building and Boiler maintainenance building to be provided as required

Bidder like to inform the customer that enough maintainence area isprovided for mill and other auxilliaries in the boiler area. No separate millmaintainence and Boiler maintainence building is not required andenvisaged in our design.


Bidder would like to inform that our design does not require maintainence buildings and maintainenance area will be provided for Mills maintainence and area will be provided for Boiler maintainenance

Mill maintenance building and boiler maintenance building is not applicable

Confirmed.As per GE standard Practice, BI plane damper with necessary sealing arrangement will be provided at APH inlet/SCR outlet flue gas duct as the APH will be located just below the SCR outlet.


Bidder would like to inform that Guillotine damper at the specified location cannot be provided due to space constraint and insead of the Guillotine gate, a bi plane damper will be provided with seal air arrangement.

Customer is requested to look into this. Central Power Utilities has agreed for this point.

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24 of 120 2.7.4 - v) Arrangement (structural steel/runway beams, motorized hoists,walkway platform alongwith runway beams etc.) for removing, handlingand placement of tubes banks/section at ground level forrepair/replacement.



26 of 120 2.8 - c) Arrangement (structural steel/runway beams, motorized hoists,walkways platform along with runway beams etc.) for removing,handling and placement of tubes banks/section at ground level forrepair / replacement. The size of platforms shall be adequate tostore 5-6 economizer assemblies as well as adequate space forhandling them.



78 of 120 2.17.11 - iii. Economizer and Reheater/SuperheaterPlatforms for handling of at least 3 rows of largest size coils andstorage of at least 8 rows of largest size coils of Economizer andReheater / Superheater (all horizontal heating surfaces in second pass)coils. Adequate platforms, walkways, access/stairs shall also beprovided for removal of second pass water walls/casing, buckstays andinstallation of monorails, hoist etc. Weight of above coils andequipments required for handling shall be accounted in the structureand platform design.



79 of 120 2.17.16 Sl No.- A- 82 Page 28 of 248 clarification No.- 02

iii) Minimum headroom (free height) under all floors, walkways and stairsshall be 2.3m.



11 of 15 33.40 Sl No.- A- 82 Page 28 of 248 clarification No.- 02

VIII. Head room for man movement shall be minimum 2.5m atground floor in TG and boiler area and 2.1m over allplatforms.

31 Volume VI: CIVIL, STRUCTURAL &ARCHITECTURAL WORKS

Ch 07 : Material:Strutural steel

Page 1 of 1 7.1 - Complete hopper including vertical and conical portion of bunker in mill building shall be provided with lining of atleast 4 mm thick SS plate grade SS316L .

Only Conical portion of bunker shall be provided SS lining of SS410 of 3 mm thickness. As accumulation of coal will be mostly at hopper portion ,No vertical/Cylindrical portion shall be lined.


This is a first of a kind requirement. Bidder would like to inform that SS is required only in the conical portion and not in the vertical portion considering the low moisture in coal


32 Volume VI: CIVIL, STRUCTURAL &ARCHITECTURAL WORKS

Ch 10 : RCC Strucure &Foundation :Allowable Settlement

Page 12 of 3610.14 - Boiler and ESP support structures shall be checked for differential settlement of foundations which shall be restricted to 1 in 1000 of span or 8 mmwhichever is less

As SBC is already based on settlement criteria, this additional Specification requirement shall not be considered in design. If we go for 8mm settlement it will lead more weightage. Boiler structure is a typically part of overall product/equipment, this individual column settlement shall not be considered.


Boiler and ESP support structures shall be checked for differential settlement which shall be restricted to 1 in 1000 of span or 8 mm in case of foundation resting on Soils and 4mm in case case of foundations resting on rock/ pileThis is as per Central Power Utilities requirement


33 VOLUME V Part B / Chapter 4 286 / 678 4.12.00 Sl No.- G- 165 Page 199 of 248 clarification No.- 02

Two nos. of 3D Acoustic wave level transmitters shall also be employed formeasuring the levels of coal bunker available above the coal feeder/mill.

In addition to above, Coal bunker level monitoring system (strain gauge typelevel measurement) shall also be supplied resulting in triple redundantmeasurement. Median or average coal bunker level will be chosen for monitoring and for process operations.

One no. 3D Acoustic wave level transmitter shall be sufficient per Coal Bunker for measuring Bunker level


Only One (1) no. of 3D Acoustic wave level transmitter is adequate for coal bunker level measurement and Strain Gauge method will not function properly in high dust environment

One (1) 3D Acoustic wave level transmitter and one (1) Strain Gauge shall be provided for each coal bunker

34 VOLUME V Part B / Chapter 4 4.07.01 283 / 678 Sl No.- G- 178 Page 202 of 248 clarification No.- 02

The nos. and type of such flame cameras to be included in the proposal shall be selected by the bidder appropriate to his boiler design subject to minimum 4 nos.

2 nos. of furnace camera is sufficient for flame viewing. Bidder will provide 2 Nos. furnace camera


Bidder wants to inform that Two cameras are providedwhich is adequate to meet operational an functional requirement. This is as per Central Power Utilities

Confirmed.



2.10.5.13 39 of 120 - Material of Construction1. Classifier(a) Cone - Lined with minimum 15 mm thick ceramic tiles on both inside and outside surfaces of the cone(b) Vanes - Lined with suitable material to provide minimum specified wear life

Clarification:Cones and Vanes are not applicable in case of dynamic classifier.


These parts are not applicable in case of Dynamic Classifier Confirmed.



2.10.5.14 39 of 120 - Minimum Guaranteed Life of Coal Pulverizer Wear Parts(d) Minimum Guaranteed Life of Coal Pulverizer Wear Parts - 25000 Hrs(e) Classifier vane 25000 Hrs.

Deviation:Since the requirement calls for Dynamic Classifier, hence Cones and Vanes are not applicable in this case. The rotor is of fabricated design and hence the Guarantee life of rotor shall be 15000 hours.


Since, Cones and Vanes are not appicable, Bidder is indicating the rotor life guarantee for Customer's information

Tender condition prevails. Instead of Cone & Vane, replace with Dynamic Clarifier.


Bidder would like inform that there is no space available to provide platform and Pressure part coil handling arrangement because of SCR and SCR inlet duct arrangement.

Central Power Utilities has also agreed for this point

Confirmed.

Bidder to consider 2.3 M high walkway wherever feasible. Otherwise 2.1 M high walkway shall be provided

As per GE standard practice, 2.1m clear platform headroom will be considered in Boiler Main platforms.

- Conflict in clauses, please clarify

No Pressure parts coil handling aranegemnt and storage platforms are ensivsaged as the SCR and its ducting arrangement will not allow for the same.

Date-22/12/2018

Page 12 of 42

Sl. No. Part Sub Section Clause No Page Bid Specification Stipulation Statement of Clarification sought Owner's Response Revised Statement of Clarification sought Owner's Response

1 Vol III Ch 11 11.3.2 P1-08, 78 of 109 Clarification-04

Inside design conditions to be maintained in all air-conditioned areas.i. Dry bulb temperature: 24 ± 10Cii. Relative humidity: 50 ± 5% (Max. 60% for areas being air conditioned using Hi-wall split AC)

It is not possible to control humidity in Split AC. With split AC inside condition shall be maintained at 24 deg. C ± (plus or minus) 2 deg. C without any heating facility.

Please accept.

The provision as per bidding specification shall prevail. It is not possible to control humidity in Split AC. With split AC inside condition shall be maintained at 24 deg. C ± (plus or minus) 2 deg. C without any heating facility. Please accept.

Confirmed

2 Volume VInstrumentation & Control Works

Part B/Ch 18: 18.08.00 32 of 33 The control & instrumentation for Air condition System and Ventilation System of main plant TG building and ESP building shall be done through with Hot Redundant Standby Processor based plant DDCMIS system covering the total functional requirement of sequence control, interlock and protection, monitoring, alarm, data logging etc.

The control & instrumentation for Air condition System and Ventilation System of service building and Administration building shall be done through with Hot Redundant Standby Processor based PLC system covering the total functional requirement of sequence control, interlock and protection, monitoring, alarm, data logging etc.

The control & instrumentation for Air condition System and Ventilation System of respective BOP package shall be done through with Hot Redundant Standby Processor based respective BOP DDCMIS system covering the total functional requirement of sequence control, interlock and protection, monitoring, alarm, data logging etc.

3 Volume- III Ch 11 11.11 28 of 30 Plant Control for Air conditioning system i) Air Conditioning System control system shall be PLC based. The PLC configuration and detailed specification of the same shall be as per Control & Instrumentation requirements specified elsewhere in the

4 Vol II Ch 9 : Mandatory Spares

9.00 50 of 106 2. Screw Compressor Chilling Machineg Solenoid valve 2 way 1 no.h Solenoid valve coil 1 seti Solenoid valve O- ring 1 setj Solenoid valve gasket 1 setk Master solenoid valve 1 no.l Master solenoid valve coil 1 set.m Master solenoid gasket 1 set

As per bidder's understanding solenoid valves are not applicable in the system. So mandatory spare parts also will not be provided.

Please confirm.

Shall be decided during detail engineeringstage.

As per bidder's understanding solenoid valves are not applicable in the system. So mandatory spare parts also will not be provided.

Please confirm.

Confirmed

5 Vol III, Part B Ch 24 24.4.3 9 of 70 Automatic HVW Spray Protection shall be provided for the following equipment: All transformers located in transformer yard of Main Plant area, Transformers located in FGD Area.

Bidder understands that transformer located in transformer yard of main plant area including FGD area shall be protected with HVW spray system having capacity greater than 2000L as per NFPA 850.

Not acceptable. The Provision as per biddingspecification shall Prevail.HVW System shall be provided as per IS:3034

Please note that as per IS 3034, Cl 8.8.1 no fixed fire protection is required for the transformers having capacity with 2000L and below. Hence bidder understands that transformer located in transformer yard of main plant area including FGD area shall be protected with HVW spray system having capacity greater than 2000L.

Confirmed for all transformers having capacity 2000L and above oil tanks in all areas (not confining to transformer yard).

6 Vol III, Part B Ch 24 24.4.4.2, xi 6 of 70 The velocity in the hydrant/Spray header shall not exceed 3 m/sec. Bidder wants to clarify that the velocity for spray/hydrant shall not be less than 5m/s as per TAC

The Provision as per bidding specification shallPrevail.

Bidder wants to clarify that the velocity for spray/hydrant shall not be less than 5m/s as per TAC

The velocity in the hydrant/ Spray header shall not exceed 3 m/sec. as per specification

7 Vol III, Part B Ch 24 24.4.4.3, L 11 of 70 Cable vaults/cable spreader rooms shall not be zoned, as far as possible all the cable galleries shall be operated in single zone. No zoning is allowed for Cable galleries.

Bidder wants to clarify that as per TAC for cable galleries it is permissible to divide the protection area into several zones, each of which shall be fed by an individual deluge valve.

The Provision as per bidding specification shallPrevail.

Bidder wants to clarify that as per TAC for cable galleries it is permissible to divide the protection area into several zones, each of which shall be fed by an individual deluge valve.


10 Vol III SG & Auxiliaries 6.9.1 42 of 54 9) Access ladder with suitable platform shall be provided for approach to all motorized hoist/trolley Due to layout constraints it is not possible to provide ladder and platform for maintenance of hoists and trolleys. Provision of ladder with platform will make layout very congested & will not serve much purpose. Temporary scaffoldings can be used during maintenance. Same practise has been followed by bidder in earlier executed projects with various customers.Kindly review and confirm.

Not acceptable. The Provision as per biddingspecification shall prevail.

Due to layout constraints it is not possible to provide ladder and platform for maintenance of hoists and trolleys. Provision of ladder with platform will make layout very congested & will not serve much purpose. Temporary scaffoldings can be used during maintenance. Same practise has been followed by bidder in earlier executed projects with various customers.Kindly review and confirm.


15 Vol III Ch 37 Data Sheet 7 of 11 Electrolyser and gas separation skid11. Working / Design Pressure : 30 BarG / 33 BarG12. Discharge Pressure : 28-29 bar G

Bidder would like to clarify that discharge pressure of electrolyser shall be in the range of 140 PSI. Please confirm the acceptance.


Bidder would like to clarify that discharge pressure of electrolyser shall be in the range of 140 PSI. Please confirm the acceptance.

Shall be decided during detailing engineering.

16 Vol III Ch 37 Data Sheet 10 of 11 Suction Pressure : 16 bar (g) Bidder would like to clarify that the suction pressure shall be in range of 100 PSI .Please confirm the acceptance.


Bidder would like to clarify that the suction pressure shall be in range of 100 PSI .Please confirm the acceptance.


17 Vol III Ch 37 Data Sheet 7 of 11 15. MOC of cell : Ni plates Bidder would like to clarify that MOC of cell will be as per bidder's proven practice. Please confirm the acceptance.


Bidder would like to clarify that MOC of cell will be as per bidder's proven practice. Please confirm the acceptance.


18 Vol III Ch 37 37.4 5 of 11 Pt 100 RTD’s in individual electrolytic cell shall beprovided for temperature measurement & monitoring.

Bidder would like to clarify that instruments mounted on cell skid will be as per bidder's proven practice. Please confirm the acceptance.


Bidder would like to clarify that instruments mounted on cell skid will be as per bidder's proven practice. Please confirm the acceptance.


G. BOP

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ConfirmedThere is discrepancy in Control philosophy of AC and Ventilation system in relevant clauses of chapter 18 (C&I Spec.) and chapter 11 (Mechanical Spec.) of specification.

For AC & ventilation system of BOP packages it may be noted that1.Package Units and split AC's provided in the Auxiliary buildings shall be controlled as per clause no 11.5.6 (XVI) and 11.5.7, chapter 11, vol-III of tender specification respectively.2. Dry ventilation system supply & exhaust fans in various auxiliary buildings shall be locally operated (on/off switch).

The provision as per bidding specification shall prevail. There is discrepancy in Control philosophy of AC and Ventilation system in relevant clauses of chapter 18 (C&I Spec.) and chapter 11 (Mechanical Spec.) of specification.

For AC & ventilation system of BOP packages it may be noted that

1.Package Units and split AC's provided in the Auxiliary buildings shall be controlled as per clause no 11.5.6 (XVI) and 11.5.7, chapter 11, Vol-III of tender specification respectively.

2. Dry ventilation system supply & exhaust fans in various auxiliary buildings shall be locally operated (on/off switch).

Date-22/12/2018

Page 13 of 42

Sl. No. Part Sub Section Clause No Page Bid Specification Stipulation Statement of Clarification sought Owner's Response Revised Statement of Clarification sought Owner's Response

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19 Vol III Ch 5 7.2.1 2 of 7 c) O/H service water HDPE/Polypropylene tanks of 5 cum effective capacitylocated on roof of DM plant, Boiler building Unit # 1, Boiler building Unit #2, Fire Station Building, ETP Building, Crusher House, Hydrogen GenerationPlant Building Ash Silo Area, Wagon Tippler Area / CHP Building, Administrative Boiling (as mentioned elsewhere) and as provided as perP&ID – Service Water System, etc.


20 Vol III Ch 5 7.2.1 2 of 7 d) O/H service water HDPE tanks of 2.5 M3, 2.0 M3 effective capacity locatedon roof of JNT # 10, Stores, Workshop, Service Building, CompressorHouse, ESP Control Room , AHP Control Room, Ash Pump House, DG SetRoom, CPU Regeneration Building, CW Pump House, and as provided asper P&ID – Service Water System, etc.


21 Vol III Ch 5 7.2.1 2 of 7 e) HDPE tanks of 1 cum capacity as and where required and as indicated inthe Service water P & ID.


22 Vol III Ch 8 8.4 5 of 16 f) Ten (10) nos. of conductivity transmitters out of which 2 Nos. on eachstrong acid cation exchangers and 1 No. at outlet of each weak base anion & strong base anion and MB exchanger. Five (5) Nos. pH transmitter analysers one (1) at outlet of each strong base anion/ MB

Weak base anion will not be applicable please confirm. No reply received. Weak base anion will not be applicable please confirm. Confirmed .

Tank capacities as shown in flow diagram shall be followed.

Tank capacities are not matching with the flow diagram (111-12-3400) . Please confirm which tank capacities need to be followed.

Tank capacities are not matching with the flow diagram (111-12-3400) . Please confirm which tank capacities need to be followed.

Date-22/12/2018

Page 14 of 42


1 Volume III Ch 19 Coal HandlingSystem

Sheet 32 of 154Sheet 38 of 154

M-1 (3) (vi)4 (H) (II)

Sl. No.- O1-36, 76 of 109Clarification -04

the drive motor of each belt conveyor shall be rated forminimum 115% of actual requirement of driven equipment atmotor output shaft at the specified guaranteed capacity ofconveyorRating of all drive motor of conveyor shall not be less than 120%of the power required at drive motor output shaft at specifiedguaranteed capacity. The motor rating shall be at 50oC ambient

Bidder will follow referred clause no. M-1 (3) (vi) for selection of motor rating.Please confirm.


Bidder will follow referred clause no. M-1 (3) (vi) for selection of motor rating.Please confirm.

The drive motor of each belt conveyor shall be rated for minimum 115% of actual requirement of driven equipment at motor output shaft at the specified guaranteed capacity of conveyor


Sheet 15 of 154

18 Sl. No.- O1-36, 76 of 109Clarification -04

Individually and collectively Noise Level shall not be more than 85 dBA measured at a height of 1.5 m above floor level in elevation and at a distance of 1.00 m horizontally from any equipment in any direction and at any load condition.

Individually and collectively Noise Level shall not be more than 85 dBA measured at a height of 1.5 m above floor level in elevation and at a distance of 1.00 m horizontally from any equipment in any direction and at any load condition except crushers floor. Please confirm acceptance


Individually and collectively Noise Level shall not be more than 85 dBA measured at a height of 1.5 m above floor level in elevation and at a distance of 1.00 m horizontally from any equipment in any direction and at any load condition except crushers floor. Please confirm acceptance

Confirmed.

3 Sl. No.- O1-19, 74 of 109Clarification -04

Tender Drawings - Layout , Conveyor Profiles Since this is EPC project, bidder also understands that all the dimensionsgiven for conveyor gallery in tender drawings are indicative and notminimum. Bidder can decide the same meeting functional and operationrequirements


4 Sl. No.- E1-06, 81 of 248Clarification -02

Building size/dimensions/levels etc as shown above for transfertowers /others buildings are minimum required.

CHP plant will be offered to suit specified functional requirement keeping raillayout, wagon tippler, track hopper as per NIT. Bidder understands that this,being an EPC project, CHP will be designed to meet the requirement ofoffered boiler. Please confirm bidder's understanding.Bidder also understands that this CHP will cater to future one unit and noadditional stockpile/unloading/receiving facility is going to come up.Please confirm bidder's understanding.

NIT document & drawings are self explanatory.Hence The provision as per bidding specificationshall prevail

5 Volume IIGeneral & Schedules

Ch 4 : Provenness Coal HandlingSystem

14 of 40 4.19 Sl. No.- O 1-29, 75 of 109Clarification -04

4.19 Coal Handling Plant4.19.1 The Bidder/its Sub-vendor should have designed, manufactured/gotmanufactured, erected and commissioned at least two (2) integrated bulkmaterial handling plants (essentially comprising of conveying and crushing)including all associated structural steel works and electrical works of minimum 1500 Metric tonnes per hour rated capacity or above for coal or other minerals of equivalent volumetric capacity which should have been in successful operation for at least two (2) years prior to the date of Techno- Commercial bid opening. At least one (1) tripper should have been supplied and commissioned in the above bulk material handling plants.and4.19.2 The Bidder/ its Sub- vendor should have designed, manufactured, supplied, erected and commissioned including all associated structural steel works and electrical works at least three (3) number cantilever boom type, slewable and luffable, bucket wheel type travelling Stacker-cum-Reclaimer suitable for stacking and reclaiming at a rated continuous capacity of 2000/1800 Metric tonnes per hour (or above) for coal or other mineral of equivalent volumetric capacity which should have been in successful operation for at least three (3) years prior to the date of Techno-Commercial bid opening. And4.19.3 The Bidder/ its Sub- vendor who meets the requirements of only para 4.19.1 above can also participate provided it collaborates / associates with a firm which fully meets the requirements specified at para 4.19.2 above.

Bidder proposes to change provenness criteria as mentioned below in line with standard practice in recent power plant tenders:4.19.1 The Bidder/its Sub-vendor should have designed, manufactured/gotmanufactured, erected and commissioned at least one (1) integrated bulkmaterial handling plants (essentially comprising of conveying and crushing)including all associated structural steel works and electrical works of minimum 1500 Metric tonnes per hour rated capacity or above for coal or other minerals of equivalent volumetric capacity which should have been in successful operation for at least one (1) year prior to the date of Techno- Commercial bid opening. At least one (1) tripper should have been supplied and commissioned in the above bulk material handling plants.and4.19.2 The Bidder/ its Sub- vendor should have designed, manufactured, supplied, erected and commissioned including all associated structural steel works and electrical works at least one (1) number cantilever boom type, slewable and luffable, bucket wheel type travelling Stacker-cum-Reclaimer suitable for stacking and reclaiming at a rated continuous capacity of 1000/1000 Metric tonnes per hour (or above) for coal or other mineral of equivalent volumetric capacity which should have been in successful operation for at least one (1) year prior to the date of Techno-Commercial bid opening. And4.19.3 The Bidder/ its Sub- vendor who meets the requirements of only para 4.19.1 above can also participate provided it collaborates / associates with a firm which fully meets the requirements specified at para 4.19.2 above.


Bidder proposes to change provenness criteria as mentioned below in line with standard practice in recent power plant tenders:4.19.1 The Bidder/its Sub-vendor should have designed, manufactured/got manufactured, erected and commissioned at least one (1) integrated bulk material handling plants (essentially comprising of conveying and crushing) including all associated structural steel works and electrical works of minimum 1500 Metric tonnes per hour rated capacity or above for coal or other minerals of equivalent volumetric capacity which should have been in successful operation for at least one (1) year prior to the date of Techno- Commercial bid opening. At least one (1) tripper should have been supplied and commissioned in the above bulk material handling plants.and4.19.2 The Bidder/ its Sub- vendor should have designed, manufactured, supplied, erected and commissioned including all associated structural steel works and electrical works at least one (1) number cantilever boom type, slewable and luffable, bucket wheel type travelling Stacker-cum-Reclaimer suitable for stacking and reclaiming at a rated continuous capacity of 1000/1000 Metric tonnes per hour (or above) for coal or other mineral of equivalent volumetric capacity which should have been in successful operation for at least one (1) year prior to the date of Techno-Commercial bid

i

Please refer amendment no. 08, Sr. No.-02.


Sheet 94 of 154

M-18(2) Sl. No.- O 1-06, 74 of 109Clarification -04

Track Hopper Bidder understands that rail over track hopper shall be provided by Owner/others who is doing railway siding.Please confirm.

This shall be decided during detail engineering. Bidder understands that rail over track hopper shall be provided by Owner/others who is doing railway siding.Please confirm.

Only rails shall be supplied by Owner. Erection of rails in bidder's scope. Bidder shall supply and erect all accessories required for the erection of rails

7 D-0444-111-13-5300, Rev )

Sl. No.- O 1-27, 75 of 109Clarification -04

Tender Drawings - Layout , Conveyor Profiles Please note that in coal handling layout of NIT having 5 railways lines near the wagon tippler and track hopper area. Further profile drawings of coal handling are prepared as per this layout.In Main Plot Plan Railway lines indicaed as 6 no" whicha re not correct as per out understanding

Bidder undersstands that coal handling layout of NIT having 5 railways lines near the wagon tippler and track hopper area are correct as all profile drawings of coal handling are prepared as per this layout. Please confirm

Layout shown in Coal handling plant layout shall be followed

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Since this is EPC project, bidder also understands that all the dimensions given for conveyor gallery in tender drawings are indicative and not minimum. Bidder can decide the same meeting functional and operationrequirements

drawing No: D-0444111-235201/5202/5203...-Rev 0- Notes

Statement of Clarification sought

Dimensions given for conveyor gallery in tender drawings are indicative. Bidder to decide the same meeting functional and operationalrequirements maintaining the walkway dimensions as shown in the Tender drawings.

Sl.No.


Clarification refernce Bid Specification Stipulation Owner's Response Revised Statement of Clarification sought

D-0444-111-13-5300, Rev. 0

Owner's Response

H. COAL HANDLING SYSTEM

Date-22/12/2018

Page 15 of 42



Ch 15 CW & ACW system Sheet 4/49 15.3 (l) Two (2) (1W+1S) Automatic self cleaning filters in discharge header of ACW pumps for each unit as detailed under clause 15.16 of this chapter and in the corresponding datasheet.

Bidder proposes to install the single(1W) self cleaning filter in individual discharge of ACW pumps in CWPH area since there is redundancy in ACW Pumps i.e. if no of pumps are three (3) then three (3) SCS are considered and not six (6) . Please confirm.

2 Nos (1W+1S) self cleaning strainers in the ACW common header shall be provided


Ch 15 CW & ACW system Sheet 10/49 15.5 (g) f) The design, construction and speed of the pumps shall be such as to minimize cavitation and ensure a long and trouble free service. The suction specific speed required (i.e. specific speed calculated with NPSH required) of the pump shall not exceed 12,000 (US Units).g) The system suction specific speed (i.e. specific speed calculated with NPSH available) shall not be greater than 8500 US units at minimum water level. Bidder shall note that the design suction specific speed available shall be based on actual operating experience of the bidder. Pump speed shall be based on the above suction specific speed available.

Bidder understands that the mentioned clauses are applicable for cw pumps only . If any contradictions found in the contract document on suction specific speed, clause mentioned in the 15.5 (g) shall prevail. Owner to confirm the same.

It is applicable for ACW and CW Pumps.

The system suction specific speed (i.e. specific speed calculated with NPSH available) shall not be greater than 8500 US units at minimum water level.


Ch 15 CW & ACW system Sheet 10/49 15.6 c The noise level shall not exceed 85 dBA overall sound pressure level reference 0.0002 microbar (the standard pressure reference for air sound measurement) at a distance of 1M from the equipment surface.

Bidder requests to accept the 90dBA considering the HT motor. Shall be 85 dBA as per specification


Ch 15 CW & ACW system sheet18/49 15.11 After the manufacture, all the CW pumps shall be performance tested at the manufacturer’s works to determine the power consumption and the head capacity characteristic in the presence of Customer’s representative as per requirements of BS:9137, standards of the Hydraulic Institute, USA or equivalent.

Bidder request owner to revise the requirement . As per standard practice, Performance tests shall be carried out in two stages. After manufacture of the pump, the first prototype pump shall be tested at shop and performance shall be verified. After installation of all the pumps and completion of initial operation/trial operations the second stage of performance test shall be conducted at site. Please confirm

Please comply with specification requirement.


Ch 15 CW & ACW system sheet18/49 15.11 For carrying out performance test at shop actual motor shall be used. The test result will be evaluated at actual speed achieved and speed correction shall be made only if there is a supply frequency variation with respect to 50 Hz.

Bidder request owner to accept shop motor for Performance testing at shop . Bidder complies to other performance testing requirement specified for shop.. However the Performance testing at site will again be done with Actual motor.

Please comply wiht specification requirement.

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I. CW ACW SYSTEM



Date-22/12/2018

Page 16 of 42


1 Vol VI Tender Drawings- Mechanical

Dwg No. 111-12-3602 - Point no 6 & 7 of Clarification 04, page 71 of 109 & 72 of 109

Bidder understands that this is a typo error and priming line shall be provided with gate valve for detection of cable galleries.

The Provision as per bidding specification shall Prevail. Discrepancy in tender specification not yet clarified.. Please clarify Priming line not required for cable galleries.

Vol VI Tender Drawings- Mechanical

Dwg No. 111-12-3601 - Discrepancy in tender specification not yet clarified.. Please clarify

Vol III Ch 24 Datasheet of Fire water Pump- B. Fire water

Booster Pumps

56 of 70

Vol VII TD- Mechanical Dwg no: 111-12-3100 1 of 1 34 of clarification 4 page 61 of 109

Flowrate from Raw water reservior: 3674 As per MoEF guidelines, specific water consumption in Thermal power plants shall be restricted to 2.5 m3/MW. However, flowrate given in the composite water scheme is higher. Please clarify

Maximum consumption of 3.0 M3/ MW shall be consider

Vol VII TD- Mechanical Dwg no: 111-12-3100 - Composite

Water Scheme&

111-12-3504 - FDof ETP

1 of 1 35 of clarification 4 page 61 of 109

As per Flow Diagram of ETP ,627 Cu.m/h clarified water will be recovered from Ash pond and the same will be reused for bottom ash disposal once Ash water recovery is available . Hence Bidder understands that the recovered water quantity to be considered in the water balance and the specific water consumption shall be calculated considering recovered water from ash pond. Kindly check and confirm.

Confirmed.


Ch 1: SG & AuxiliariesSection 2 : DesignBasis ofSG & Auxiliaries andSCRSheet | 33 of 120

DesignBasis of

SG & Auxiliaries andSCR

Page 4 of 56 2 Clarification 03 pt. no 283, pg 34 0f 80

Following works will be excluded from the bidder’s scope: i) Procurement/Supply of ………… fire tenders.

Pl. confirm the bidder’s scope w.r.t. Fire Tender along with fire safety equipment. As herein the Fire tenders excluded from bidder’s scope whereas as per specification “VOLUME-III / Ch 24 : Fire Detection, Alarm & Protection System / 24.4.10 / Sheet 53 of 70”, fire tenders along with fire safety equipment are to be supplied by bidder. Discrepancy wrt scope may please be rectified.

Pl. confirm.

Only Fire Tenders will be procured by Owner. GE’s clarification 04, Point No 8, pg 72 of 109 procurement of fire tender is in GE’s scope. Fire tender shall be excluded from bidder's scope of work

Owner to clarify

Fire tenders and foam tenderd are excluded from bidder's scope.

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Booster Pump for Fire Hydrant system shall be 137 M3/hr. Booster Pump for Spray system shall be 410 M3/hr.

J. Fire Fighting System

3

Point no 6 & 7 of Clarification 04, page 71

of 109 & 72 of 109

Confirmed.

Bidder found discrepancy in the Firewater booster pump capacity for both spray as well as Hydrant pump. Hence Firewater booster pump capacity shall be selected as per the system requirement. Customer is requested to confirm the same.

The Provision as per bidding specification shall Prevail.2

Clarification reference Sl.No.


Bid Specification Stipulation Statement of Clarification sought Owner's Response Owner's Response

Please note that water requirement for Ash disposal is not considered in tender Water Balance Diagram. In flow diagram for Effluent Treatment Plant, water requirement considered for Ash disposal is very less. Since client has specified lean slurry disposal for bottom ash and flyash as per specification, water requirement for the ash generation shall be approx 1975 m3/hr without ash water recovery. Since ash recovery will start after approx one year after commitioning of plant and the water consumption during this time is not included in specific water consumption (as confirmed by client) , the additional requirement of 1975 m3/hr shall be arranged by client in addition to approved specific water consumption mentioned in contract. With Ash recovery, additional 300 m3/hr water shall be required from raw water pumps.

Revised Statement of Clarification sought

Date-22/12/2018

Page 17 of 42


1 Volume III 20 of 47 1.1.16 Sl. No.- A-28, 13 of 248 clarification -02

x) Suitable metallic type expansion joints wherever necessary shall be installed.

2 Volume III 64 of 120 2.13.1.11. Sl. No.- A-28, 13 of 248 clarification -02

Expansion Jointsi) Metallic type expansion joints suitable for the serviceconditions shall be provided.

Section 1 : Scope/Ch1: SG &

Auxiliaries/Vol-III

1.13.7.1

vi) Ducts and Dampersb) Flue gas ducting system shall be complete with adequately sized turning vanes, deflector plates, flow splitters, guide vanes and all necessary gas flow control devices of suitable erosion resistant material, metallic type expansion joints,

Section 2 : DesignBasis of SG &Auxiliaries and

SCR/Ch 1: SG &Auxiliaries/Vol-III

2.13.1.11

Expansion Jointsi) Metallic type expansion joints suitable for the service conditions shall be provided. The expansion joint design shall conform to the requirements of the EJMA Standards.

Section 2 : DesignBasis of SG &Auxiliaries and

SCR/Ch 1: SG &Auxiliaries/Vol-III

2.21.5, 11, i)

Expansion jointsMetallic expansion joints and anchor points for the system shall be selected by the contractor in line with such over-arching requirement of system design.

4 Volume-II 5 of 7Appendix II Coal Quality Parameters

Sl. No.- C-10, 34 of 109 clarification -04 6.0 Ash Analysis: Bidder assumes the Ash Analysis provided is on %wt (weight) basis.

Customer to kindly confirm Confirmed.

Revised Coal Ash Analysis indicates Na2O maximum as 0.1% whereas generally this is minimum 0.1% i.e., ESP design shall be based on 0.1% for Design and Worst coals (Guarantee Point and Design Point). Bidder requests owner to replace maximum by minimum.

Consider Na2O as maximum is 0.1% for Desing as per analysis.

Volume III 8 of 15 3.8.8 Sl. No.- C-19, 35 of 109 clarification -04

Each dust hopper shall be provided with a high level and a low level dust level monitor operating on proven Radiofrequency measurement principle. The level monitoring system shall incorporate all the necessary accessories including two nos. level switches per hopper (one for high and other for low.......

Volume V 98 of 100 4.00.00 Sl. No.- C-20, 35 of 109 clarification -04

Each Economiser hopper, APH Hopper, ESP hopper & Pyrite hopper must be provided with 3 nos. level switch (switches 2 nos. for high level and One no. for low level.)


3 D TYPE ACOUSTIC WAVE LEVEL TRANSMITTER:

Type : Acoustic Wave Level Transmitter (3 D type)Application : Level, Volume, quantity & Mass of each FlyAsh storage silo/Bunker, each coal bunkerand each ESP Hopper (First Field).

Volume III 8 of 15 3.8.5 Sl. No.- C-22, 35 of 109 clarification -04

The dust hoppers shall be electrically heated upto a minimum of lower one third (1/3) of the dust hopper height but not less than 1.5 meter in height by thermostatically controlled panel type heating elements to prevent ash bridge formation.


x) Each ESP Hopper & Economiser hopper shall be provided with 2 nos. RTDs to control the temperature of ash through Hopper heater.

K1. BOILERK. ESP-FGD

K2. ELECTROSTATIC PRECIPITATOR

5

6

Agreed

Section 2As per Bidder standard practice, Both Metallic/Non Metallic expansion joints

will be considered.Agredd for both Mettalic and Non- Mettalicexpansion joints.

The phrase "bidding specification shall prevail" in other Bidder's query response is creating ambiguity . We understand that Bidder's response is acceptable.Section 2

Each dust hopper shall be provided with a high level and a low level dust level monitor operating on proven Radiofrequency measurement principle. The level monitoring system shall incorporate all the necessary accessories including two nos. level switches per hopper (one for high and other for low). First field hoppers to be provided with one no. Acoustic 3D level transmitter also.

Confirmed.

Ch 2 : Project Information

Reply is not clear. Please clarify if 3.8.8 of Mechanical works Section 3 to be considered or 4.00.00 of Vol V Part A to be consider for the quantity of RF type level switch. Further please clarify Since Acoustic 3D level transmitter is already provided in the first field ESP hoppers,

Does bidder need to consider also the RF type level switches for the first field ESP hoppers ?

Vol. V: PART A

Part B/Ch 2: Field &Measuring Instruments

Ch 1: SG & Auxiliaries, Section 3 : Electrostatic Precipitator Customer Specification for ESP Hopper heater control is contradictory in

Mechanical and Instrumentation specification. Mechanical specification indicates thermostatic Control whereas instrumentation indicates RTD control. Customer to confirm which type of control is to be considered. Bidder proposes to consider thermostatic controlled type.Further bidder also proposes to consider Tubular type heaters instead of Panel type which would facilitate easier maintenance compared to panel type heaters and also minimise insulation removal during the maintenance /replacement of heaters.

Bidder to consider as per clause 3.8.5. Panel type heaters to be considered.

Customer reply that Panel type heaters are to be considered and they have to as per 3.8.5 of

Mechanical works section 3 is clear. Hence bidder understands that RTDs in ESP Hoppers are not

required. Customer to please confirm

Vol. V: PART A

Ch 1: SG & Auxiliaries, Section 3 : Electrostatic Precipitator

As per Clause 2.19.06 in Instrumentation specification for field and measuring instruments 3D type Acostic Wave level Transmitter is to be installed in first field ESP hoppers.Whereas clause 3.8.8 in Electrostatic Precipitator specification this indicates 2 nos RF type Level switches hoppers and Part A of Vol V. indicates 3 nos of level switches.

Please confirm which specification to be followed. Bidder proposes to consider one Acoustic 3D level Transmitter as per Instrumentation specification in 1st field hoppers and 2 nos RF type level switches per hopper in rest of the field hoppers other than first field. Customer to confirm.


3

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Sl.No.

Enquiry Specification refernce sl no. (as per customer replies) Owner's Response Revised Statement of Clarification sought Statement of Clarification soughtBid Specification Stipulation Owner's response

Date-22/12/2018

Page 18 of 42


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Sl.No.


1 Volume III :Mechanical Works

Sheet 19 of 54

6.4.2.2 (j)

6.4.2.1 (b)

Sl. No.- D-10, 36 of 109 clarification -04

j) The dampers shall be pneumatically operated and controlled from the control room.

b) A gas tight, motor operated Guillotine gate type damper shall be provided at the outlet of each ID Fan.

Both statements are contradictory. Please clarify which is correct.Further customer's specifications and PFD shows that no separate ID Fan for FGD system and hence only FGD inlet dampers will be valid. ID Fan inlet and outlet dampers separately not applicable for FGD system. Customer is requested to recheck and confirm.

Bidder understanding is correct.Bidder requests customer to confirm what type of dampers to be used at FGD Inlet, Outlet and Bypass Dampers. Bidder envisages to consider Guillotine Damper at FGD Inlet and FGD Outlet, Pneumatic operation Multilouvre Dampers at FGD Bypass Duct since Bypass duct is required for Quick action.

Consider Guillotine Damper at FGD Inlet and FGD Outlet, Pneumatic operation Multilouvre Dampers at FGD Bypass Duct since Bypass duct is required for Quick action.


Sheet 31 of 54 6.6.6 (4) Sl. No.- D-10, 36 of

109 clarification -04 Coarse screen at suction side of these pumps shall be provided.No screen will be provided at suction side of the mill circuit pumps as per proven & standard Industrial practice. Bidder would recommend the same. Customer to kindly confirm

The Provision as per bidding documents shall prevail.

Bidder would like to inform that Mill circuit pumps are high concentraton slurry application about 55%, hence installation of Coarse screens are not recommended since there is risk of clogging. Bidder requests customer to consider bidder's clarification.

No screen required to be considered at suction side of the mill circuit pumps


Sheet 32 of 54 6.6.7 (1) Sl. No.- D-44, 39 of

109 clarification -04

v) Solids Concentration:Max. 20% by weight or actual as per suppliers practice, whichever is minimum

The slurry concencentration will depend on the process parameter for limestone slurry pumps. This should be as per limestone grinding system outlet slurry concentration & higher than 20% by weight.

The Provision as per bidding documents shall prevail. Request to consider slurry concentration of max 30%

as per 6.8.1 (3). Maintaining max 20% would required higher amount of water to be recirculated into the system and can result in higher size of pumps.

consider slurry concentration of max 30% as per 6.8.1 (3)


Sheet 35 of 54 6.7.5 (3) Sl. No.- D-17, 37 of

109 clarification -04(1W+1S) horizontal centrifugal pumps shall be provided to feed 4x100% (1W+1S) secondary waste water hydro-cyclones.

Bidder understand the statement as " (1W+1S) horizontal centrifugal pumps shall be provided to feed 2x100% (1W+1S) secondary waste water hydro-cyclones." Please confirm


It is understood that bidder clarification is acceptable as per point 46 below.

Consider 2x100% (1W+1S)


Sheet 35 of 54 6.7.5 (5) Sl. No.- D-18, 37 of

109 clarification -04 …………...2x100% (1W+1S) waste water tank. Bidder will consider common wastewater tank (no stand-by is envisaged) for 2 boiler units of the FGD system as per Bidder's proven practice.


It is understood that bidder clarification is acceptable as per point 3 &4 above.

Consider one number common hydrocyclone feedtank


Sheet 36 of 54 6.7.7 (2) Sl. No.- D-19, 37 of

109 clarification -04The bidder shall provide 2x 100% pumps to pump back the slurry from the sump back to absorber in maximum time of 8 hrs.

Bidder would like to inform that this pump is used only during the maintenance. Hence 1x100% Emergency absorbent pump as per standard & proven industrial practice is envisage. Customer to kindly consider the same and confirm


It is understood that bidder clarification is acceptable as per point 7 above.

Consider 2 x100% pumps as referred in this clause


Sheet 37 of 54 6.8.1 (4) Sl. No.- D-21, 37 of

109 clarification -04In addition, flushing water lines with motorized valves shall be provided for each pump for automatic flushing of the pump after each shut down.

Bidder proposes to consider pnematically operated valves for flushing purpose of each slurry pump for automatic flushing of the pump after each shut down as per standard & proven practice. Customer to kindly confirm

The Provision as per bidding documents shall prevail. Noted, However bidder would like to again inform that

Pneumatic valves can also be used for this purpose instead of motorized valves. Customer is requested to consider bidder's clarification

Pneumatic Valves can be considered


Sheet 5 of 35 27.2.8 Sl. No.- D-22, 37 of


Inspection holes shall be provided at suitable locations for pipes 800 Nb and above as required for periodic observations and inspection purposes.

Bidder has aboveground pipes in recycle pump suction & discharge having size higher then 800 NB which does not have any provision for inspection holes. So Bidder understands that this clause may be applicable for underground pipes only. Employer to confirm on Bidders understandsing.


We understand this clause is not applicable for slurry application, and Bidder envisages these not be installed in the recycle slurry piping

Bidder understanding is correct


Sheet 5 of 35 27.2.10 Sl. No.- D-24, 37 of


For large size pipes/duct, at high point and bends/change of direction of flow, air release valves shall be provided as dictated by the system requirement and operation philosophy & tripping conditions of pumping system. Sizing criteria for air release valves shall be generally on the basis of valve size to pipe diameter ratio of 1:8. Requirement shall be decided as per relevant code.

Bidder would like to inform that use of air release valves is not required in large sized pipes connected to recycle pump discharge and suction.Employer to confirm on Bidders understandsing.


We understand this clause is not applicable for slurry application, and Bidder envisages these not be installed in the recycle slurry piping

Bidder understanding is correct

10 Volume III :Mechanical Works 5 of 54 6.1.4 Sl. No.- D-27, 37 of


a) Motor operated gas tight guillotine type isolation dampers shall be provided at following locations for each unit: i) At inlet & outlet of each CID fan.ii) Clean gas duct at outlet of each absorber.

Multi louver damper quick opening pneumatic/motor operated shall be provided at following locations for each unit.i) Clean gas duct at outlet of each absorber.ii) FGD bypass clean flue gas duct.

1) Bidder does not recommend installation of multi louver damper at the outlet of absorber as guillotine damper will be installed at the outlet of absorber. And required control can be done with the help of multi louver damper placed in the bypass duct.

2) Further no damper requirement at the inlet of FGD absorber inlet is indicated, the same shall be required for Isolation of FGD absorber during Bypass condition.Bidder requests customer to consider the same.

3) Bidder understand that dampers of CID Fan are already covered under Boiler ID Fan requirements and no separately.


Bidder requests customer to confirm what type of dampers to be used at FGD Inlet, Outlet and Bypass Dampers. Bidder envisages to consider Guillotine Damper at FGD Inlet and FGD Outlet, Pneumatic operation Multilouvre Dampers at FGD Bypass Duct since Bypass requires quick operation / action

Consider Guillotine Damper at FGD Inlet and FGD Outlet, Pneumatic operation Multilouvre Dampers at FGD Bypass Duct since Bypass duct is required for Quick action.

11 Volume III :Mechanical Works 20 of 54 6.4.2.3

Sl. No.- D-40, 38 of 109 clarification -

04

All the gates shall be designed for tight shut off. Multi Louver gate type dampers mentioned in the tender specification shall have a guaranteed gas tightness efficiency (on flow) of not less than 99.95% along the duct as well as from the duct to atmosphere or from atmosphere to the duct, depending on the pressure in both the damper open and damper closed condition without the use of seal air fans of the damper

Bidder wish to clarify that the multilouver damper shall have a guaranteed gas tightness efficiency (on flow) of not less than 99.5% without seal air fans and 100% leak tight with seal air fans under operation. The Guillotine gate type dampers shall have a guaranteed gas tightness efficiency (on flow) of not less than 99.95% along the duct as well as from the duct to atmosphere or from atmosphere to the duct, depending on the pressure in both the damper open and damper closed condition without the use of seal air fans of the damper and with seal air fan, it is 100%.


Bidder would like to highlight that Multilouvre damper with sealing efficiency 99.95% is not possible without the use of seal air fan. Bidder once gain would like to inform 99.5% efficiency would be practical without seal air fans and 100% sealing efficiency with seal air fans is the optimised solution. Request customer to consider bidder's reply.

Multilouvre Dampers shall be provided with Sealing arrangement for 100% sealing efficiency.

12 II

Appendix – II: Coal QualityParameters

Sl. No.- D-01, 49 of 75 clarification -

03

PROXIMATE ANALYSISULTIMATE ANALYSISGCVAsh Fusion TemperatureAsh Analysis

1. Customer to clarify whether given coal analyses are as "Air Dried" basis or "As received" basis. If it is "air dried" basis, kindly furnish Total moisture value.2. Summation of provided ultimate analysis (if assumed as dry ash free basis) does not adding to 100%. It is 100.35%, 92.46% and 109.4% for Design, Worst and Best coal respectively. Kindly provide the ultimate analysis including GCV on as received basis.3. Kindly confirm whether furnished Ash fusion range is "Under reducing atmosphere".4. Content of trace elements in ppm for Chlorine, Fluorine, Lead, Zinc, Arsenic, Cadmium, Chromium and Mercury, if any to be mentioned in ultimate analysis of coal.HCl and HF content in Flue gas has got implication on Limestone consumption,Recirculation flow rate and waste water quantity in FGD system.Lead, Zinc, Arsenic, Cadmium, and Chromium are considered to poisonous to SCR catalyst. This will have adverse effect on catalyst life and efficiency.

Revised coal analysis shall be provided ithrough amendement.

Revised Coal Analysis do not comprise of Chlorine and Flourine in Coal. Content of Trace elements not provided

Biddder may consider the value of Chlorine and Flourine prevalent in the Indian worst coal.

K3. FLUE GAS DESULPHURISATION

Ch 6 : Flue GasDesulphurisation System





Ch 27 : Low Pressure Piping, Valves & Specialities

Ch-2





Ch 27 : Low Pressure Piping, Valves & Specialities

Date-22/12/2018

Page 19 of 42


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Sl.No.


1 Vol.-II, Generals & Schedules

Ch 5 : General Technical

Requirement Sheet 42 of 91

40.2

Sl. No.- D-MSE Power Cycle- 244,

30 of 75 clarification -

03

The Power Plant will be developed based on the guidelines of the State Environmental Authorities and that of MoEF. Suitable provisions will be

incorporated in the design of buildings, structures, and selection of equipment, so that there are no adverse effects due to emissions, noise,

and contamination of soil, water and air. One single flue stack of 275 meter will be provided for 660 MW unit for wider dispersion of pollutant

as per environmental guidelines.

As per MOEF guidelines, for Thermal Power plants with FGD, stack height/limit is given as :

H=6.902(QX0.277)0.555 or 100 m whichever is more.

Q = Emission rate of SO2 in kg/hrH = Physical stack height in meter.”

275 m tall chimney is too high as per the above MOEF guidelines. Chimney height may be reviewed. Accordingly kindly inform the Chimney Height to be

considered .

Reffer Amendment -04. Further guidelines if any to be clarified Please follow amendment requirements

2 II Chapter-9: Mandatory Spares

2.18 , 9b(iv) and 13

Sl. No.- K-36, 61 of 75 clarification -

03

Gear Motor - 4 Nos Drive Motor - 5 No

Gear motors and rapping motors are the same. Hence bidder shall not consider the motors under 2.18 9b(iv). Customer may review and confirm the

bidder understanding

Bidder understanding is correct. Consider as per

2.18(13) pumping motor.

Which Pumping motor is not clear, this is specified in ESP spares where generally no pumps are applicable

Geared Motors only shall be considered for Mandatory Spares

K4. MSE POWER CYCLE

Date-22/12/2018

Page 20 of 42


Volume III Ch 4.0 Raw WaterIntake System 2 of 3 4.2 118

It is proposed to locate the Raw Water Intake Structure at SITE 3which is 350 M downstream of the State Govt Intake structure (asper enclosed WAPCOS final report on water drawl study).

The report mentioned in the specification (WAPCOS water drawl study) ismissing.Please furnish the same for our information

Refer Addendum -01.

Volume VI Ch 2 Scope of Work 3 of 11 2.6 123

A raw water intake pump house & intake structure on river Ganga bank and pipe line (MS/GRP) from Intake to raw water reservoir in the Plant areaRiver Ganga bank or in the canal of River Ganga as there is ambiguity inclauses of technical specification.

Please clarify whether intake structure (pump house etc.) to be construted onRiver Ganga bank or in the canal of River Ganga as there is ambiguity inclauses of technical specification.

Intake structure will beon River Ganga.WAPCOS Report to befollowed.

Volume III Ch 4.0 Raw WaterIntake System 2 of 3 4.2 5

It is proposed to locate the Raw Water Intake Structure at SITE 3which is 350 M downstream of the State Govt Intake structure (asper enclosed WAPCOS final report on water drawl study).

WAPCOS final report on water drawl study is not enclosed in Tenderspecification. Owner is requested to proVol-VIde WAPCOS final report.

WAPCOS Report enclosed.

2 Volume VI Ch 05 Geo TechInvestigation 4 of 4 5.12 3

-

Geotechnical Investigation Report (Customer) at Intake well structurelocation i.e. at river basin.Owner is requested to provide.

Addendum -01. In WAPCOS report in Addendum-01 , it is mentioned that two boreholes BH-1 and BH-2 have been done for intake well. However, in the report,borelog data and bearing capacity recommendations are missing. Owner is requested to provide the missing data without which the depth of the well cannot be ascertained.

WAPCOS report is only for reference purpose. Any missing or additional data is to be arranged by the Bidder and is in the Scope of bidder to make the the system fully operational ensuring adequacy of plant operation.

3 Volume VI Ch 11 Service Building 10 0f 16 11.12.1 97

Service building:Seating accommodation for senior O&M executive along withsupporting staff including furnitures of latest style.

In order to keep all bidders at par, Owner to furnish the following informationpertaining to service building:a) Number of occupantsb) List of furniture including their type, make and numbersc) Additional items like printer, LCD display, water coolers etc. to be explicitlymentioned, if required.

a) 2000 M2 area in 4-5stories shall be included inBidder's scope.b&c) Excluded fromBidder's scope.

Owner is requested to finalise exact number of stories required in the service building in order to bring all the Bidders at par.

Bidder shall consider 1500 M2 per floor in case of 4 storied building or 2000 M2 in case of 3 storied building.

Volume VI Ch:16 Ash Pond 1 of 2 16.0 77

Further, to start with only about 30 acres of land in one of thebottom ash lagoon will be provided with impervious liner andbalance part of the bottom ash lagoon shall be lined by spreadinghigh concentrated fly ash during initial stage of slurry disposal.Plot Plan:ash pond area (307 Acre)

Bidder understand that if HCSD system is not applicable for this project, ashpond area (307 Acre) as specified in plot plan shall be used for proposedUnits (2X660 MW) only.Please confirm bidder's understanding.

Confirmed.

Volume VI Ch:16 Ash Pond 3 of 3 16.1 .(e) 64

Ash Pond u/s slope and HDPE lining of bed portion shall be provided with 1mm thick. The lining shall be procted with cement sand mortar under50mm precast concrete slab of grade M-15 complete.

Bidder understands that only U/S slope needs to be provided with precastconcrete slab lining and there will not be any protection for the pond bed(except 30 acres) as per clause 16.0. Please confirm.

Confirmed.


Further, to start with only about 30 acres of land in oneof the bottom ash lagoon will be provided with imperviousliner and balance part of the bottom ash lagoon shall be lined byspreading high concentrated fly ash during initial stage of slurrydisposal.

a) 307 acres of Ash pond area has been earmarked in the Plot Plan. Bidderrequest, Owner to earmark 30 acres area within which impervious liner to beprovided.b) Also, spreading of high concentrated fly ash during initial stage of slurrydisposal is not included in bidder's scope and any kind of liner is not required.Please confirm.c) Owner to specify the material and thickness of the impervious liner.

Bidder to comply withstipulation of technicalspecification.


Ash Pond Bidder understands that only starter dyke is in the scope of the Bidder andfuture raising will be done by the Owner. Also, there is no HCSD system isrequired as per Mechanical Specification.Owner is requested to confirm the detail scope of ash pond.

Confirmed.

5Annexure - III (Roads

& Land Under Acquisition)

- Patrol Road - - - - -

- Bidder requests Owner to confirm whether the patrol road is of bituminous road or RCC construction. Also, as per road layout drawing, the patrol road between 400E-500E and 0.00 N-100N is not connected to any other road. Bidder understands that length of the patrol road is to be provided as per layout provided in Annexure-III only. Also, Bidder understands that the patrol road in the outer periphery of the colony area and the admin block area are excluded from Bidder's scope.

All roads shall be of RCC construction.The patrol road between 400E-500E and 0.00 N-100N shall be connected to road near material handling gate.All roads shown in the Annexure III except falling in Admin block area and Colony area are in bidder'd scope.The roads shown in road drawing (Annexure-III) with colour coding as per legend shall be followed.

6 II (Roads & Land Under Ch 02 Paving 4 of 11 2.0 49. - - - -

The extent of paving is mentioned as power house to chimney including Boiler area in Vol-VI, Ch-02, Clause 2.0-49. However, in Annexure-III, paving is shown in the entire FGD area also. Bidder requests Owner to confirm that RCC paving keeping 5m extent from the equipment in the North-South direction in the plot plan between the power house and FGD area is acceptable to the Owner. The extent of PCC paving in the transformer area will also be provided 5 m from the equipment edge in the North-South Direction.

The extent of paving from power house to chimney including Boiler area in Vol-VI, Ch-02, Clause 2.0-49 shall be provided. Paving shall be provided for FGD area also.

Sl.No.


EPC PACKAGEFOR



refernce sl no. (as per customer replies) Bid Specification Stipulation Statement of Clarification sought Owner's ResponseOwner's Response Revised Statement of Clarification sought

L. CIVIL

WAPCOS report is only for reference purpose, the bidder has to carry out his assesment/study, design and construct the raw water intake system to make the system fully operational as per requirement of plant ensuring adequacy of plant operation.

The bund shall be of homogeneous type with impervious geo-membrane (HDPE 1mm thick) layer including base. 150 mm thick sand blanket shall be provided below the geo-membrane bottom as a cushion. The Ash Pond shall be provided with 75 mm thick precast concrete tiles of M20 grade concrete over HDPE film/ sand planked lining. The protective layer over HDPE shall be provided over entire bed and side slopes of the ash pond. only one lagoon without any divider bund is to be provided.

1

There is discrepancy in WAPCOS report for the location of the intake well and pump house in the various drawings.In the drawing BUXAR /2015-16/Topo-01 (Page 154 of 157), the location of the pump house is shown within the river almost at the mid location. However, in Page 155 and 156 in WAPCOS report, the intake well is shown in the river bank. If the intake well is provided in the bank, then the minimum water level will not be available in all the season for operation of the pump. In view of this, Bidder requests Owner to provide exact co-ordinate of the intake well and the length of the approach bridge from road to the well in order to bring all the Bidder's at par.

4

Contradiction observed between various responses.Bidder understands that since both bottom ash and fly ash will be disposed in slurry form in the ash pond area of 307 acre, the entire pond bed is to be lined and not only 30 acre area. Also, Owner is requested to provide the specification and thickness of impervious lining. Also, Owner is requested to confirm that only one lagoon without any divider bund is to be provided by the Bidder.

Date-22/12/2018

Page 21 of 42


Sl.No.


EPC PACKAGEFOR



refernce sl no. (as per customer replies) Bid Specification Stipulation Statement of Clarification sought Owner's ResponseOwner's Response Revised Statement of Clarification sought

L. CIVIL

Volume VI Ch 11 Building Description 14 of 16 11.15.1 57

The maximum level of Reservoir will be kept at level which willbe at least 500 mm below the finished floor level of the plant orjust at the plant formation level.

Bidder proposes an alternative of keeping maximum level of reservoirabove plant formation level, as required. As a result of same, raw waterreservoir needs to be constructed partially above ground.Owner to please accept the option.

Acceptable. Free board shall be 1.5 M frommaximum water level.

Volume VI Ch 11 Building Description 14 of 16;15 of 16 24

Free board of 500mm minimum shall be maintained. Themaximum level of Reservoir will be kept at level which will be atleast 500 mm below the finished floor level of the plant or justat the plant formation level.Due to the length of the reservoir, waves may be set up by windblowing over it. According to IS: 10635 a wave height of 1.0 m maybe obtained hence the free board is kept as 1.0m. Hence the topof embankment is kept 500 mm above the finished floor level ofMain Power House building.

a) Owner to clarify the ambiguity between clauses about Free board and Topof embankmentb) Bidder shall be allowed to decide embankment top based on cut fillbalance. Please confirm

Free board to be kept 1.5 M & embankment 500 mmabove FFL of Main Power House Building.

8 Volume II Ch 1 5 of 12 1 94

Bidders shall note that one (1) more unit of 660 MW may be added infuture by the EMPLOYER as an expansion unit for possible augmentationof the station. For this purpose, the employer envisages suitable spaceprovision to be kept for one (1) 660 MW future expansion unit to beintegrated along with that of the present two (2) nos. 660 MW units,which are shown in the indicative Plot Plan (Refer Volume - VII). Assuch suitable provision shall be kept by the bidder in various Civil,Mechanical, Electrical and C&I systems of present 2x660 MW units forfuture augmentation/integration & interconnection of correspondingsystem & facilities with the present units as brought out in various subsections/parts/chapters of the technical specification (Volume II toVII).

a) Owner to note that tender specification for Civil and Structural works (Volume VI) do not specify any scope of work regarding future expansion. In order to make all bidders at par, Owner is requested to specify provisions tobe kept in Civil/Structural buildings, if any, for future expansion.b) With reference to the aforesaid statement, bidder shall consider future expansion as furnished in mechanical section. Please confirm.c) Construction of Road, fencing, paving, drains and any other associated works for future expansion are excluded from Bidder's scope of work. Please

a) Only spare provsion.b)Confirmed.c) All roads as shown inPlot Plan are in bidder'sscope of work.

Bidder understands that space provision for future unit is to be kept only. The roads along the future unit , roads within the future units and the connecting road between the present and future unit along with the drains are not in Bidder's scope. Owner is requested to confirm this.

The roads as shown in the road drawing (Annexure-III) shall be in bidder,s scope.

The plan dimension and the top level of the embankment of raw water reservoir can be decided by the bidder keeping freeboard of 1.5M.The minimum level of the embankment shall be RL 65.0 m i.e. 500 m above the FFL of power house building

7

Discrepancy observed in the response from Owner. Bidder understands that the plan dimension and the top level of the embankment can be decided by the Bidder. The minimum level of the embankment shall be RL 65.0 m i.e. 500 m above the FFL of power house building.

Date-22/12/2018

Page 22 of 42

Sl.No.

Part Sub Section Clause No page/Clarification

reference

Specification / CustomerDeviation/Clarification Customer Reply on Clarification Additional Response

M. HEX

1 Volume - IIIMechanical Works

Ch2: Steam Turbine and its Auxiliaries

Sec- 2: Design Basis3.2 (xv) 29 of 70 All extraction pipes routed through the condenser shall be provided with stain

less steel shroud to prevent erosion.

As Per Bidder product specific design, Bidder propose external corrosion allowance (1.6 mm) i.e. same as shell to prevent erosion in all extraction pipes routed through inside condenser neck.

Shall be decided during detailing engneering



Sec- 2: Design Basis3.3.1 (l)

Sl. No.- J1-5, 65 of 109

Clarification -04

Tube plugging Margin : 10%Bidder proposes as the condensers shall be designed for heat load corresponding to unit operation for valves wide open (VWO), 1% make-up conditions, design condenser pressure hence additional tube plugging is not required.

The Provision as per bidding specification shallprevail. This point may further discssed Tube plugging Margin : 10% to be considered.



Sec- 2: Design Basis5.5.1 (ii) 50 of 70 Shell of carbon steel as per ASTM-516 Gr. 70 and water box channel as per

ASTM A-266 class-II and shall be welded to tube sheetWater box channel as per ASTM A-266 class-II or ASTM -516 Gr 70 and shall be welded to tube sheet.

Confirmed.



Sec- 2: Design Basis6.4 51 of 70

Corrosion allowance of 3 mm shall be added to the design thickness of theshell and head of the vessels. The minimum thickness of the vessels including corrosion allowance shall not be less than 8 mm.

Corrosion allowance shall be similar to condenser shell side for flashbox i.e. 1.6 mm The Provision as per bidding specification shall prevail.



Sec- 2: Design Basis6.5 51 of 70

The Shell, head, wear plate/ baffles shall be made of ASTM 285 Gr. C orequivalent material. The material of nozzle neck shall be ASTM A 106 Gr. Bor equivalent.

Flashbox material shall be ASTM A 516 Gr.70 as per bidder product specific design which is suprior than ASTM 285 Gr. C. Nozzle material shall be ASTM A 106 Gr. B or equivalent or suprior.

Confirmed.

OWNER'S REPLY

M1. CONDENSER

M2. Feed Water Heaters

M3. Flash Tanks

EPC PACKAGEFOR



Date-22/12/2018

Page 23 of 42

1

THR (105%) : Turbine Cycle Heat rate in kcal/kWhr under rated steamconditions at guaranteed Condenser pressure with zero make up at 693 MW unit load (i.e. 105% of rated load). (To be calculated as per clause 3.4 of this section)THR (100%) :Turbine Cycle Heat rate in kcal/kWhr under rated steam conditions at guaranteed Condenser pressure with zero make up at 660 MW unit load (i.e. 100% of rated load). (To be calculated as per clause 3.4 of this section)

Bidder proposes the 100% TMCR HR guarantee at design CW inlet temperature. This approach is suitable for EPC projects, where bidder is responsible for entire system/s requirements and as such boundary conditions shall be minimised. Please accept.

Bidder shall follow Tender Specification Refer to pt # 8 below

Bidder shall guarantee condenser pressure and the CW inlet temperature shall be 33 degC

2following correction curves for variation in Turbine Cycle Heat rate & Turbine Generator output to be furnished(e) Variation in condenser pressure for main condenser.

Bidder proposes correction for design CW inlet temperature in place of condenser pressure for Heat Rate guarantee. This approach is suitable for EPC projects, where bidder is responsible for entire system/s requirements and as such boundary conditions shall be minimised. Please accept.



3(ii) Corrections Applicable for Condenser pressure Guarantee(a) Variation in Ambient Wet Bulb Temperature (WBT).(b) Variation in Ambient Relative Humidity (RH).

Bidder proposes correction for design CW inlet temperature in place of variation in WBT and RH for correction in condenser pressure applicable for Heat Rate guarantee. As clarified above, separate condenser pressure guarantee is not envisaged by bidder. Please accept.



4

ADJUSTMENT FACTORS FOR BID EVALUATIONTurbine Cycle Heat Rate in kcal/kwhr under rated steam conditions at guaranteed optimized condenser pressure with zero make-up at 660 MW Unit Load (i.e. 100 % of rated load) INR 119 Million (Rupees One Hundred Nineteen Million Two hundred Thousand only).............................

5

AMOUNT OF LIQUIDATED DAMAGES (LD) APPLICABLE UNDERCATEGORY-I GUARANTEESAt 100% TMCR (660MW) Turbine heat rate: INR 58,200,000/-(INR FiftyEight Million Two Hundred Thousand only) or equivalent foreign currency or per 1 Kcal/Kwhr increase in heat rate..............................

6 Temperature rise in circulation water across the condenser : 8°C(Maximum)

7 Design circulating water quantity at inlet temperature of 33 degC : 82000 M3/hr.

N. PERFORMANCE GUARANTEES

Bidder would like to clarify that for EPC projects where bidder is responsible for entire technical integration and performance of entire plant and in order to offer best optimised parameters, the temperature rise and cooling water flow should be decided by bidder. Please accept bidder's request to exclude the specified CW temperature rise and cooling water flow.

As per Tender Specification. Different margins are provided for the packages and hence the performance of Individualequipment as per system requirement is necessary.

Bidder understands that condenser design pressure should not be more than 77 mmHg, however CW temperature rise can be optimized to comply with above requirement.

The temperature rise and cooling water flow shall be decided by bidder.

EPC PACKAGEFOR



Revised Statement of Clarification sought Owner's Response

Bidder would like to bring to your notice that Evaluation rateis higher than the LD rates specified in tender document. Bidder request to re-review the applicable LD rates and Bid Evaluation factor.

Evaluation factor is for the project consisting of 2 units. LD value indicated is unit wise shortfall in Guarantee value.

Bidder understand the amendment-03 dated Oct 29, 2018, page 10 of 27, Sl. No. 19 shall be applicable to all the bidders. Reply listed here is superseeded by the amendment-03 issued on Oct 29, 2018. Please confirm.

Refer Amendment-03 dated Oct 29, 2018, page 10 of 27, Sl. No. 19 shall be applicable to all the bidders.

S.No. Bid Specification Stipulation Statement of Clarification sought Owner's Response

Date-22/12/2018

Page 24 of 42

Sl. No. Part Sub Section Page Clause No Specification / Customer Deviation/Clarification Owner's Response

1 Vol III

Chapter 23

Chapter 23

Chapter 23

17 of 20

7 of 20

11 of 20

Data sheet6.5

8.2.12.14

23.6.5

Field Performance Test

Please be noted that performance test of compressor at site is not possible because site conditions are different than design conditions.

However all performance test shall be performed in shop.

Please accept.

Performance test shall be performed at Shop. Auxiliary Power consumption shall be demonstrated at site.

2 Vol III Chapter 23 5 of 20 23.4.8

(i) The total Instrument Air requirements shall be assessed by thefollowing guideline:Z = {2(A+B)+C+D} x [1+ (mw+ml)/100] where,A = Instrument Air requirement for SG & auxiliaries of each unit(continuous).B = Instrument Air requirement (continuous) for TG & auxiliaries ofeach unitC = Instrument Air requirement (continuous) for Water treatmentplant and other facilitiesD = Station C&I requirement (continuous).mw = Wear & tear margin (10%)ml = Leakage margin (10%)Z = Total Instrument Air requirement

Bidder understands that the total Instrument Air (IA) requirement (Z))calculated from the referred clause is for both the units and in order to arrive at the compressor capacity, the same needs to be divided by nos of working IA compressors ( i.e each compressor capacity= Z/2).Please confirm bidder's understanding.Also, IA requirement for SG and TG auxiliaries is doubled plus margin for wear and tear as well as leakage margin is added. This shall result in bulky design of service air compressor and increase in capital as well as operating cost of compressed air system. Hence, Bidder requests Owner to remove the margin for wear/tear and leakage.

Each compressor capacity= Z/2.

Bidder shall follow margins as specified in specification

Vol III Ch. 5 3 of 14

5.3. l)One (1) complete sludge handling system consisting of sludge sump of effective capacity 300 cum., two (2) Nos. (1W+1S) of Sludge Transfer pumps, along with sludge flushing & recirculation arrangement etc.

Vol VII TD-Mechanical 1 of 1 DWG-111-12-3500 Sludge Thickener, Thickened Sludge Sump and Centrifuge

Vol VII TD-Mechanical 1 of 1 DWG-11-12-3100 Slurry from Sludge sump to Ash slurry pit and to Thickened

Vol III Ch. 25 6 of 7 25.3.7

Each unit shall be provided with skid mounted hydrazine & ammonia dosing system comprising of 1x100% capacity measuring tank, 1x120% capacity preparation/ dosing tank and 2x100% metering pumps complete with strainers, piping, valves, fittings, instrumentation and control panel etc. Ammonia and hydrazine shall be received in containers/ barrels and electrically operted pumps (drum pumps) shall be provided for transfer of ammonia and hydrazine to the respective measuring tanks.

Vol VIITD-Mechanical: P&ID Chemical Dosing System

Sheet 1 of 1 Dwg no: 111-11-0901A

One no. Ammonia solution preparation cum metering tank with hand pump and metering pumpsOne no. Hydrazine solution preparation cum metering tankwith hand pump and metering pumps

Sludge thickener + centrifuge shall also be conswidered in the scope in line with the P&ID alongwith Volume-III Scope.

Clause no. 25.3.7 to be followed, Type of pumps shall be electrically operated instead of hand operation

Please clarify the scope of Sludge treatment system for PT Plant. As per Datasheet, Sludge treatment shall only consist of Sludge sump and Sludge transfer pumps. As per Water balance diagram, sludge treatment system with thickener and centrifuge as well as sludge transfer to Ash slurry pit is shown.

There is a descrepency in the number of tanks and type of pump to be provided for transfer of chemicals to measuring tanks between mentioned clause and P&ID. Please clarify

EPC PACKAGEFOR



O. MECHANICAL

3

4

Date-22/12/2018

Page 25 of 42

Sl. No. Part Sub Section Page Clause No Specification / Customer Deviation/Clarification Owner's Response

EPC PACKAGEFOR



5 Vol III Ch. 38 6 of 19 38.3 Zero Liquid Discharge ETP

Bidder propose to use the CW blowdown for Ash disposal since we are having wet ash disposal and the water quality meets process requirement. Hence RO ETP is not required. Bidder confirms to comply with Zero Liquid Discharge without RO ETP.

Bidder to optimise the water consumption requirements and shall decide the need for RO ETP considering bottom ash and coarse ash in wet disposal form and disposal of fly ash in dry form to Silos.

6 Vol III Ch. 8 1 of 16 8.1There is a descrepency wrt client WBD. We understand that 80 m3/hr shall be gross capacity and DM water required for regeneration shall be included in the capacity mentioned.

DM plant for each stream shall be 80 m3/hr plus regeneration waste.

Vol V Ch. 14 Sheet 4 of 10 Annexura A Sl 7

Vol III Ch. 17 6 of 18 17.5.1

The scope of supply for DM Plant shall include two (2) DDCMIS based DM streams each of 80 cum/hr net capacity complete with regeneration facilities, chemical storage and handling equipments, two (2) DM Water storage tanks of capacity 1200 cum each, waste neutralizing facilities with interconnecting pipings, valves and other accessories as detailed in data sheets and drawingsCW Chlorination System, Chemical dosing and Sulphuric Acid Dosing SystemControl system: PLC

The operation of the plant shall be done through Plantwater system DDCMIS provided with redundant hot standby processor and can be monitored from Operating Station located in Control Room inside C.W. Treatment Building.

Vol V Ch. 14 Sheet 4 of 10 Annexura A Sl 7 Raw Water Chlorination System : Control system: PLC

Vol III Ch. 5 4 of 14 5.4The operation of pre-treatment plant shall be provided with stand alone DDCMIS based semi-automatic plant water control system.

Vol V Ch. 14 Sheet 5 of 10 Annexura A Sl 8 Effluent treatment plant: Control system: ETP PLC

Vol III Ch. 38 Sheet 7 of 19 38.5 Main ETP CMB sump pumps along with UF/RO module shall becontrolled from Plant water system DDCMIS.

10 Volume III -Mechanical

Ch 15 : CW & ACW System 15.17 Sheet 32 of 49

Circulating Water (CW) pipework from pump discharge header to condenser and from condenser to Induced Draft Cooling Tower shall be rolled from minimum 22 mm thick carbon steel plates to IS:2062.

CW pipework to main supply and return header shall be 22mm thick and for balance like Pump suction, CT header, CT Riser, branch to Conderser etc the thickness should calculated during detail engineering. Please confirm.

The pipe thickness for smaller diameter pipes shall be followed as indicated in LP piping specification of Volume-III

8

Separate PLC shall be provided.



9

There is a descrepency in the mentioned clauses. We understand that the system shall be controlled from common DCS as per Volume III and no separate PLC shall be considered for the system. Please confirm



7

Date-22/12/2018

Page 26 of 42

S No Bid Specification Stipulation Statement of Clarification sought Owner's Response Bidder's Queries Owner's Response

1 Volume-III Ch 20 Mill Reject

Handling

System

Sheet 2 of 7

Sl. No.- O2-3, page

No. 77 0f 109,

Clarification -04

Pneumatic pressure conveying system shall be employed for handling of the mill rejects.

Bidder request Owner to also accept mechanical conveyor system for conveying mill reject from pyrite hopper to mill reject silos. Please confirm.

Not acceptable. Follow Specification.

This point was accepted during discussion with Owner/Desein and also in the draft replies.Owner is requested to relook in the matter and confirm that mechanical conveyor system is also acceptable for conveying mill reject from pyrite hopper to mill reject silos. The provision as per bidding

specification shall prevail.


P. MILL REJECT HANDLING SYSTEM

EPC PACKAGEFOR



Date-22/12/2018

Page 27 of 42

S No Clarification REF.Reference

S No. (as per customer replies)

Bid Specification Stipulation Statement of Clarification sought Owner's Response

Revised Statement of Clarification

soughtOwner's Response

1+A6:M101

Volume IIGeneral & Schedules Ch 9 MandatorySpares 17 of 106

2.0 LIST OFMANDATOR

YSPARES -

MECHANICAL


Y. MANDATORY SPARES

10

We understand this clause is intended for power cycle piping integral to Steam Generator and is not applicable for non integral Power Cycle Piping

Confirmed.

2


3.3 Group C:

Mandatory Spares


Y. MANDATORY SPARES

11

We understand this clause is intended for power cycle piping integral to Steam Turbine nd is not applicable for non integral Power Cycle Piping

Confirmed.

3


19.00 POWERCYCLE PIPING:


Y. MANDATORY SPARES

12

We understand this clause is intended for power cycle piping in general and is not applicable to Steam Generator & Steam Turbine integral piping as they have their separate clauses

Confirmed.

EPC PACKAGEFOR



There is discrepancy among the Mandatory spares clause for Power CyclePiping, Valves, Spring Hangers & Steam Traps.Spare quantities are different under the clauses. Owner is requested toprovide clarity on the spare quantities applicable

Shall be decided duting detailed engineeringstage. More stringent shall be followed.


Q. PIPING

Date-22/12/2018

Page 28 of 42

S No Clarification REF.Reference

S No. (as per customer replies)

Bid Specification Stipulation Statement of Clarification sought Owner's Response

Revised Statement of Clarification

soughtOwner's Response

EPC PACKAGEFOR




Q. PIPING

Volume III - Mechanical Ch 4 Raw water intake

system

Intake water pump discharge pipe size shall be minimum 1200 mm spirally welded pipe to IS: 3589.

GRP make Intake Water Pipeline is not acceptable (from intake structure up to raw water reservoir). Spirally welded MS pipe to IS: 3589. as specified

shall be provided.

Volume VI - CIVIL,

STRUCTURAL &

ARCHITECTURAL

WORKS

Ch 06 Requirement of Building

A raw water intake pump house & intake structure on river..Ganga bank and pipe line (MS/GRP) from Intake to raw water reservoir in the Plant area

Not acceptable.The provision as per bidding specification shall prevail.

Clarification is not Clear. Bidder requests Owner to clarify whether GRP make Intake Water Pipeline is acceptable from intake structure up to raw water reservoir

Bidder understands that both Mild steel

and GRP pipe material are allowed in specification for river water intake

pipeline from intake structure up to raw

water reservoir. Owner to please

confirm.

Sl. No.-R-14, Page 85 of 109, clarification -04

Sl. No.-R-15, Page 85 of 109, clarification -04

4

Date-22/12/2018

Page 29 of 42

Sl.No. Part Sub Section Clause No page Clarification REF. refernce sl no. (as per

customer replies) Bid Specification Stipulation Statement of Clarification sought Revised Statement of Clarification sought OWNER'S REPLY

1 Volume - III Chapt 2 2.2.2.1 3of 70 clarification sheet 2 Page 39/clarification sheet 04 & page 44

Note: - * Maximum Operating Main Steam & Hot reheat temperature at Turbine inlet shall be 605°C.±5 DegC is operating margin. Turbine shall be designed for 605 DegC temperature.

Bidder proposes Rated temprature for MS and HR & will be 600 C . Turbine is capable of accepting variation in main steam and hot reheat steam paramaters as per IEC45 requierment.

a.) Clarifications accepted for GE but rejected for other bi Clarification given toGE hold good.

2 Volume - III/VolumChapt 2/ Chapt 8 2.1.5/5.10 6 of 70/29 of 78 clarification sheet 04 Sl. No. E-2 Page 40 of 109

Step load change Minimum ±10% per minute to facilitate fast loading/ unloading of the unit Ramp Rate Minimum ± 3% per minute above 30 % load (under sliding pressure operation) Minimum ± 5% per minute (50% to 100% load)(under Constant pressure operation) 5.10 Rate of change of load and sudden load change withstand capability The contractor shall demonstrate capability of boiler-turbine-generator in regards to ramp rate and step load change as specified and sudden load change withstand capability.

Bidder proposes Sliding pressure operation and step load change as per clause 1.2 (b) Vol. II, Ch-3, Pg. 2 of 3 i.e. Ramp Rate Minimum ± 3% per minute above 30 % load (under sliding pressure operation)Minimum ± 5% per minute (50% to 100% load) (under Constant pressure operation)Hence 50% to 100 % load operation should be sliding pressure operation and 30% load under Constant pressure. Please confirm

e) a) Discrepancy in tender specification not yet clarified by customerIf you see in spec( 1.2 (b) Vol. II, Ch-3, Pg. 2 of 3) it selfsays load operation should be till 40% TMCR should be sliding pressure . & below 40% TMCR is constant pressure operation

Bidder shall consider for modified sliding pressure operation:● 0% to 40% TMCR : Constant Pressure Operation● 40% to 100%TMCR: Sliding Pressure Operation● 100% TMCR toVWO : Constant Pressure Operation

3 Volume - III Chapt 22.18.15

2.20. (s)20 OF 70 clarification sheet 04 Sl. No. E-3, Page 40

of 109

Capable of operation in parallel with turbine with all feed waterheaters in service.

Steam generator output corresponding to BMCR flow under rated steam conditions, turbine in parallel operation with HP-LP bypass open to full capacity

In these specified conditions Steam Generator flow shall be such that BMCR heat duty of boiler is not exceeded. Please confirm

e) Major clarifications GE would like to discuss againwith client (Limited only).d) Other clarifications rejected for GE which are technically not feasible to comply by GE


4 Volume - III Chapt 2 2.5 (vii) 10 of 70

Ensure independent tuning of at least 3 stages of LPT f r e es t a n d i n g blades to avoid resonance frequency in the operatingfrequency range of 47.5 Hz. to 51.5 Hz.

Last stage row will be free standing.Agreed. It shall meet frequency requirement.

5 Volume - III Chapt 2 2.19.3/2.20. (i)/2.20 (v) 21 of 70/23 of70/24of 70

3)Ensure during sliding pressure mode, throttle pressure slides from ratedpressure corresponding to 40% of BMCR load./i)198MW output under turbine throttle inlet steam conditionscorresponding to sliding pressure operation at design condenserpressure with 0% & 1% make-up.v) Turbine operation at 40% rated pressure at designcondenserpressure with 0% and 1% make up, under sliding pressureoperation.

As per clause 1.2 (b) Vol. II, Ch-3, Pg. 2 of 3 mode of operation is as below 1) 0 to 40% TMCR: Constant Pressure Operation.2) 40% TMCR to 100% TMCR: Sliding Pressure Operation,3) 100% TMCR to VWO: Constant Pressure Operation.Please confirm

e) a) Discrepancy in tender specification not yet clarified by customer

Bidder shall consider for modified sliding pressure operation:● 0% to 40% TMCR : Constant Pressure Operation● 40% to 100%TMCR: Sliding Pressure Operation● 100% TMCR toVWO : Constant Pressure Operation

6 Volume - III Chapt 2 2.19.4/2.20 c 21 of 70 clarification sheet 04

Sl. No. E-5, Page 40 of 109

Clarification- 04

Provide adjustable throttling reserve from sliding pressure to modifiedsliding pressure./ 594 MW (i.e 90% of rated load) under turbine throttle inlet steamcond ition corresponding to modified sliding pressure operation andrated steam temperature at condenser pressure with 1% make-up

As per clause 1.2 (b) (Vol. II, Ch-3, Pg. 2 of 3 ) bidder understand throttle reserve will be 5% please confirm.

e) a) Discrepancy in tender specification not yet clarified by customerSpec it self says 5%throttle reserve as per clause 1.2 (b) (Vol. II, Ch-3, Pg. 2 of 3 )

Please refer S.No.5

R. TURBINE

EPC PACKAGEFOR



Sl. No. E-2 Page 40 of 109Clarification- 04

Date-22/12/2018

Page 30 of 42



EPC PACKAGEFOR



Volume - III Chapt 2 2.20 m 23/70 clarification sheet 04Sl. No. E-6, Page 40

of 109Clarification- 04

(m) HP heaters out of service (One string and both strings) under ratedsteam conditions at design & worst condenser pressure with zeropercent make up and 1% make-up and maximum continuousoutput.

as per the clause 2.1.4 :Turbine shall be capable of continuous operation under all HP heaters out of service with maximum output not less than rated output.As per the above clause max output will be rated output or output limited to BMCR heat duty which ever is lower.

e) Major clarifications GE would like to discuss againwith client (Limited only).

Volume - III Chapt 2 2.20.1 Worst pressure in the condenser mm Hg (a) 89Bidder understand Worst condenser pressure will be corrosponding to max cooling water temp (36 c) Please confirm

a.) Clarifications accepted for GE but rejected for other bi

Volume - III Chapt 2 2.20 u 24 of 70 clarification sheet 04Sl. No. E-8, Page 40

of 109

Steam Generator output corresponding to BMCR flow under ratedsteam condition, turbine under VWO operation, worst condenser ressure 1% make up at rated feed water temperature. Differenceof BMCR flow and VWO steam flow through turbine shall beassumed to be drawn off from Main steam line. Same quantity offlow to be added to condenser as additional make up. (GURANTEEDSTEAM GENERATOR CAPACITY)

Bidder understand as per the clause (Vol. III, Ch-2, Section-2, sheet 25 of 70) & (Vol-III, Sec 2.2.2.1, Pg 220 of 1106) rated final feedwater temp to be maintained at 100% TMCR CASE and all other cases temperature will be as calculated.

a) Discrepancy in tender specification not yet clarified by customer

8 Volume - III Chapt 2 2.20.4 27/70 clarification sheet 04Sl. No. E-9, Page 40

of 109 Furnish turbine expansion line diagrams for various load conditionsalongwith stage by stage efficiencies.

As stage efficiency is proprieatry information hence will not be provided



9 Volume - III Chapt 2 5.1 (ii) 41 of 70 clarification sheet 04Sl. No. E-10, Page

40 of 109

ii) The plant shall be suitable for operation in conjunctionwith theturbine. It shall be designed for raising the temperature of feedwater from that in the condenser to a final feed water temperatureof 306ºC at the outlet of top heater at rated output with zeropercent make-up and design back pressure. TTDs and DCAs ofheaters shall correspond to the VWO operating conditions.

As per clause 5.14 a Vol II Ch 8 a) TTDs and DCAs of feed water heaters shall be demonstrated as perguaranteed heat balance diagram for 100% TMCR conditionTTDs and DCAs of heater shall be defined for 100% TMCR case. Please confirm

a) Discrepancy in tender specification not yet clarified by customer

Provison as per Bid Specification shall prevail and shall meet @ VWO condition.

10 volume III Chapter 2 / Section-22.20.1 (xi) clarification sheet 04Sl. No. E-11, Page

40 of 109

1.As per clause 2.20.1 xi) , Volume III Ch2 Feed water pressure at terminal point to be considered for computation of the guaranteed heat rate and computation of heat balance diagrams for guarantee conditions. Bidder shall be entitled of heat rate correction for variation in feed water pressure at terminal point (from the values tabulated above) as per correction curves to be submitted along with his offer. Final Feed water Pressure shall be confirmed as per selected SG supplier during detail Engineering stage.

Since this is a EPC project, internal boundary conditions may not be applied between Boiler & Turbine for Heat Rate Guarantee, HBD and corrections. Bidder is responsible for entire BTG and will consider appropriate parameters for offering optimized performance.As such bidder requests to remove feed water pressure as boundary condition.



7

Sl. No.- C- 50 Page 57 of 248 Clarification 2 &Sl. No. E-6, Page 40 of 109

Clarification- 04Agreed. Shall be as per bid specification under SG Guaranteed Condition.

Date-22/12/2018

Page 31 of 42



EPC PACKAGEFOR



11 Volume - III Chapt 2 2.2 22 of 70 clarification sheet 04Sl. No. E-12, Page

40 of 109

Heat Balance Diagram.

(b) 660 MW output under rated steam conditions at design condenserpressure with zero make-up (GUARANTEED HEAT RATE).

Bidder propsed condenser design will be as per (Vol-III, Chapter -2, Sec 2, Clause 3.3 (I) sheet 29 of 70). And All other cases required as per (HEAT BALANCE DIAGRAMS Vol-III, Chapter-2, sec-2 ,(a to x) ) will be on floating condenser pressure .

Confirmed

12 Volume - III Chapt 2 2.16 15 of 70

In case of complete power failure including DC supply, TurbineGenerator set shall be capable of safe coasting down. Bidder shallconsider overhead lube oil tank for safe coasting down of turbine.

Please note that mail oil pump is shaft driven gear pump. Gear pumps arevolumetric pumps, which deliver oil almost until standstill without requiringexternal energy. Keeping in view the robust design of shaft driven gearpump, Bidder's standard and proven practice over head tank is notenvisaged. The similar design has been supplied to various utilities. Pleaseaccept the proposal.

d) Other clarifications rejected for GE which are technically not feasible to comply by GE


13 Volume - III Chapt 2 2.1.6 6 of 70

Cold Start (after shut down period exceeding 72 hours) - 455Warm Start (after shut down period between 10 hours and 72hours) - 1000Hot Start (after shut down period less 10 than hours) - 4550

No. of Startups shall be as per CEA guidelinesCold Start - 150Warm Start - 1000Hot Start - 4000



14 Volume - III Chapt 2 2.4(i) 9 of 70 Provide forged alloy steel rotor.As per bidder's design, HP & IP rotors shall be of welded design which isproven practice of bidder

e). Major clarifications GE would like to discuss again with client (Limited only). Confirmed.

15 Volume - III Chapt 2 2.6(iv) 10 of 70Horizontally split with the ability to dismantle and replace lowerhalf with minimum shaft lift.

Bearing design shall be as per bidder's standard, offered bearing shall havesplit at inclination with ability to dismantle and replace lower half withminimum shaft lift.

e). Major clarifications GE would like to discuss again with client (Limited only). Confirmed.

Date-22/12/2018

Page 32 of 42



EPC PACKAGEFOR



volume 1 Section III Bid data shBid evaluation table 53 of 63

ADJUSTMENT FACTORS FOR BID EVALUATIONTurbine Cycle Heat Rate in kcal/kwhr under rated steam conditions at guaranteed optimized condenser pressure with zero make-up at 660 MW Unit Load (i.e. 100 % of rated load) INR 119 Million (Rupees One Hundred Nineteen Million Two hundred Thousand only).............................

volume 2 chapter 8 3.2 i(b) 8 of 78

AMOUNT OF LIQUIDATED DAMAGES (LD) APPLICABLE UNDERCATEGORY-I GUARANTEESAt 100% TMCR (660MW) Turbine heat rate: INR 58,200,000/-(INR FiftyEight Million Two Hundred Thousand only) or equivalent foreign currency or per 1 Kcal/Kwhr increase in heat rate..............................

Volume 3 Chapter 2 3.3.1 (h) 30 of 70 Temperature rise in circulation water across the condenser : 8°C(Maximum)

Volume 3 Chapter 2 3.3.1(i) 30 of 70 Design circulating water quantity at inlet temperature of 33 degC : 82000 M3/hr.

16

Bidder would like to bring to your nitice that Evaluation rateis higher than the LD rates specified in tender document. Bidder request to re-review the applicable LD rates and Bid Evaluation factor.

page 39/ clarification sheet 2 Refer Amendement No. 03

17

Design Circulatung water quantity shall be decided by bidder conidering condenser inlet temp. of 33 deg.

C

Bidder would like to clarify that for EPC projects where bidder is responsible for entire technical integration and performance of entire plant and in order to offer best optimised parameters, the temperature rise and cooling water flow should be decided by bidder. Please acess bidder request to exclude the specified CW temperature rise and cooling water flow.

see below attcahed screen shot similar clarification asked at page50/clarification sheet 2

clarification sheet 2

clarification sheet 2

Sl. No.- C-21, page 45 of 248.

page50

Date-22/12/2018

Page 33 of 42


Vol III 16 DMCW System 11 of 12

DATASHEET FOR

PLATE HEAT EXCHANGERS

Clarification-04 H1.41 (Page 56 of 109)

Primary (DMCW):Inlet – Bidder to work out. However DMCW system temperature rise not to exceed 5.5 deg. C.Secondary (ACW):Oulet – Bidder to work out. However ACW system temperature rise not to exceed 5.5 deg. C.

Bidder requests SJVNTPL not to limit temperature rise for ACW &DMCW system as temperature rise across the condenser shall be decided by the bidder and ACW system is provided with booster pump scheme. Kindly confirm

Confirmed for ACW System, but shall not be higher than 8oC

Vol III 15 & 16

5 of 49&

3 of 12&

11 of 12

15.4.5 Clarification-02 285 (Page 145 of 248)

The design flow rate in the clarified water (ACW) side of the operating PHEs for the unit shall be considered same as the design DMCW flow rate, with the average temperature rise of ACW system limited to 5.5 deg. C under all circumstances. &In computing the design heat load and design DMCW flow in individual DMCW system Bidder shall ensure that the average temperature rise of DMCW is limited to 5.5 deg.C under all circumstances.&Inlet/Outlet water temperature : Bidder to work out. However DMCW / ACW system temperature rise not to exceed 5.5 deg. C

Design flowrate and Temperature rise of DMCW system need not tobe same as that of ACW system.Further, hot water temperature of ACW will be selected such that not to exceed the CW return water temperature at condenser outlet, as selected /optimized by bidder, instead of restricting ACW side temperature rise to 5.5°C. Hence, ACW and DMCW design flowrate and temperature rise shall be optimized by Bidder. Owner is requested to confirm

Confirmed.

Volume VIIFlow Diagram -

Extraction system for BFP Turbine

Clarification-04 G.18 (Page 45 of 109) Scheme of BFPT steam addmission

Bidder will offer the steam supply system to BFPT as per the chosen BFPT supplier design. Nevertheless, bidder confirms meet the intent of the specification and ensure motive steam supply from IP extraction and an alternate steam supply from CRH and auxiliary steam headers. Employer to give flexibility of design to be confirmed during detailed engineering.

The Provision as per bidding specification shall prevail.

Clarification-03 174 (Page 23 of 75) Refer Zones F-10 & F-8 ; F-6 & F-5,separate flow nozzles are indicated for Aux Steam/CRH line & IPT extraction line to BFPT-A & BFPT-B

The arrangement, viz. piping, valves etc., shown is different from bidder's design. Single admission BFPT, with single set of stop & control valve for admission to each BFPT, only at the inlet of BFPT, shall be provided as per bidder's design. However, bidder confirms to meet all the intended functional requirements with the bidder's design.

Will be decided during detailed engineering

Vol -VII Clarification-03 147 (Page20 of 75)Drain and vents, manual /motorized valves, NRVs, IBVs, etc. as indicated in the tenderPID.

We understand that drain & vent valves, IBV, motorization of valves, etc. asshown in the Tender drawings are indicative only. The finalization of these itemsshall be as per the system O&M, control & layout requirement

Confirmed.

Volume VIITender

Drawing -Mechanical

Clarification-04 G.5 (Page 44 of 109)Bidder understands that the Integral bypass valve to the MOVs shown in the tender drawings is indicative only and the same will be provided as per the upstream and downstream parameters requiring integral bypass.


Volume VII

FlowDiagram-

Condensatesystem

Feed watersystem

Clarification-04 G.23 (Page 45 of 109) MOV is shown for CEP suction and BFP Booster pup suction.

Locked open manual CEP and BFP suction valves will be provided by thebidder. This ensures any unintentional closing or opening of the suctionvalve from DCS control station while the requirement is otherwise asensured and known more correctly by the local operator. This is forequipment safety to prevent it from low suction NPSH and cavitation.Employer to confirm.


Volume VIITender

Drawing -Mechanical

Clarification-04 G.34 (Page 46 of 109) High point vents and low point drains are shownBidder understands the vents and drains shown are only indicative. Highpoint vents and low point drains shall be provided as per piping layoutrequirement.


Volume VII

FlowDiagram-

Condensatesystem

Clarification-04 G.35 (Page 46 of 109) CPU bypass valve is shown as MOV.The CPU bypass valve shall be based on CPU supplier's standard practice.Same may be pneumatic/motorized. To be finalized DDEEmployer to confirm.


Volume VII

FlowDiagram-

Feed watersystem

Clarification-04 G.38 (Page 46 of 109) The reheater spray line isolation valve is shown as motorizedgate valve with manual integral bypass globe valve.

Bidders clarifies that it is recommended to provide LO manual gate valvewith manual integral bypass valve for the reheater spray line.Employer to confirm.


Volume VII

FlowDiagram-

Feed watersystem

Clarification-04 G.39 (Page 46 of 109)

Motorized gate valve is shown in the HP bypass spray line from feed water line after last HPH.

Bidders clarifies that the type of valve and actuator for isolation and control of the HP bypass spray shall be as per bidder's standard and proven practice. Accordingly motorized isolation valve may not be applicable.Employer to confirm.


Volume VII

FlowDiagram -

Steam drainsystem

Clarification-04 G.46 (Page 47 of 109) Note6: Bidder shall ensure the compliance ASME TDP (Latest)in addition to drain & vent as specified in this scheme.

Bidder confirms for the compliance of ASME TDP. However drains shown inthe scheme may not be required completely. Hence number of drains shallbe decided DDE after availability of piping layout. Note 3 of the samedrawing mentions drains are indicative only and shall be finalised based onactual piping layout.


Vol -VII Clarification-03 147 (Page20 of 75)

Refer NOTES:Quantities & type of Instruments/ analyzers shall be finalized by the owner during detailed engineering as per process & redundancy requirements as stipulated in the technical specification.

Instrumentation shall be provided as per system operational & controlrequirement as per BIDDER latest engineering practice being followed insupercritical plants.

Will be finalized during detailed engineering

3

Tender drawings mechanical.

Bidder understand that drain & vent valves, IBV, motorization of valves, etc. as shown in the Tender drawings are indicative only. The finalization of these items shall be as per the system

O&M, control & layout requirement

All (As applicable)

Drawing no. 111-11-0600111-11-0700

All (As applicable)

Drawing no. 111-11-0600

Drawing no. 111-11-0700

Drawing no. 111-11-0700

Drawing no. 111-11-0501

Tender drawings mechanical.

Flow diagram of Extraction Steam for BFP turbine DWG. No. 111-11-0401

Owner's Response Revised Statement of Clarification sought

1Bidder understands that Employer has removed the restriction of ACW and DMCW system max. dT of 5.5 degC.Bidder to suitably design the ACW and DMCW system.

Sl.No.

Enquiry Specification Clarification raised by refernce sl no. (as per customer replies) Bid Specification Stipulation Statement of Clarification sought

S. WATER TREATMENT SYSTEM

EPC PACKAGEFOR



Owner's Response

Confirmed.

Shall be decided during detailed engineering.

The drain & vent valves, IBV, motorization of valves, etc. asshown in the Tender drawings

are indicative only. The finalization of these items

shall be as per the system O&M, control & layout requirement

2

Drawing no. 111-11-0401

Bidder understands that the scheme of BFPT is tentative. The exact scheme shall be decided based on single / dual addmission BFPT based on OEM standard.Bidder confirms meet the intent of the specification and ensure motive steam supply from IP extraction and an alternate steam supply from CRH and auxiliary steam headers

Date-22/12/2018

Page 34 of 42

Vol Ch/Sec. Title page ClauseOwner's Response Revised Statement of Clarification soughtSl.

No.Enquiry Specification Clarification raised by refernce sl no. (as per customer replies) Bid Specification Stipulation Statement of Clarification sought

EPC PACKAGEFOR



Owner's Response

Vol -V Part-A 11 of 100 4.00.00 (f)

For sequence, protection, control and alarm circuits, electronictransmitters, temperature elements with temperature transmitters etc.are to be provided. Process actuated switches may be accepted only in very few cases if the same is as per standard and proven practice of equipment supplier subject to owner’s approval.


Vol -V Part-A 12 of 100 8

Wherever process actuated switches are being provided for sequence, protection and alarm purposes, adequate number of blind type switches separate for eachapplication ( i.e. sequence, protection, alarm ) with separate necessaryindicating gauges are to be provided meeting adequate redundancyrequirements. Contacts of indicating type switches, gauges and receiverinstruments shall not be acceptable.


Vol -V Part-A 15 of 100 7

Level switches / pressure switches / flow switches/any other process switch etc. for OLCS / Alarms / Interlocks / Protection. Pressure switches at inlet, outlet of individual pumps and discharge header of pumps for protection and auto start / stop & alarms shall be provided.


Vol -V Part-A 94 of 100 2.00.00 (ii) Pressure switches

4

Bidder explained the contradictions in the specification about the requirement of switches. In line with Vol. V Part-A Cl.

4.00.00 (f) Page-11 of 100, electronic transmitters are offered for sequence controls, interlocks and protection. Switches shall

be offered only if same is standard and proven practice of equipment supplier. Kindly confirm

Pressure transmitters are not provided for all services as mentioned for Pressure gauges & Pressure Switches. Pressure Transmitters shall be provided for control interlocks, protection and critical monitoring only as per OEM's standard and proven

practice.


In line with Vol. V Part-A Cl. 4.00.00 (f) Page-11 of 100, electronic transmitters are offered for sequence controls, interlocks and protection.This is in line with the latest philosophy adopted in various power plants.Customer is requested to confirm.


Date-22/12/2018

Page 35 of 42



EPC PACKAGEFOR



Owner's Response

Vol. V Part-A 94 of 100 2.00.00

i. Pressure Gauge for:l) Pressure gauges at inlet and outlet of each cooling water line ofcompressor, heat exchanger and cooler.s) Pressure Gauge shall be provided upstream and downstream of eachcontrol valve station.

<< New point >>

Vol. V Part-A 95 of 100 2.00.00iv. Pressure Transmitters:a) For all services as mentioned for Pressure gauges & Pressure Switches.

<< New point >>

Clarification-03 160 (Page21 of 75) Refer zone F4 & D4,motorised isolation valve, motorised bypass valve & isolation valve across spray control valve are indicated.

No motorised isolation valve, motorised bypass valve & isolation valve acrossspray control valve shall be provided as manual operation is not recommended.Bidder does not recommend these valves for ensuring safety of the system.

Will be finalized during detailed engineering.


HP and LP bypass system


HP and LP bypass spray control station with electrically operated MOVs and manual valve including bypass is not recommended as it might obstruct the desuperheater flow in case of power source failure. The electrohydraulic valve with mechanical fail-safe position during power source failure is provided in order to protect the system. Employer to confirm.


Volume VII

FlowDiagram-

Condensatesystem

Clarification-04 (GE) G.25 (Page 45 of 109)

Bidder understands, the configuration for control station shown is indicative. Bidder does not envisaged MOV/manual isolation for motorised bypass to control valve.Employer to confirm.


Refer zone F-5, motorized isolation valve at downstream of each deaerator level controlvalves and motorized isolation valve at upstream & downstream of the bypass line todeaerator level control station are indciated.

Will be decided during detailed engineering.

Volume - IIIMechanical

Works

Ch.2 : Steam Turbine

and its AuxiliariesSection-1: Scope of

WorksSheet 7 of 12

1.6 (2) & (3)

2) One motor operated gate valve on upstream and one manual operated gate valve ondownstream of each condensate control valve.3) One motor operated inching valve in bypass line of above condensate control station.


Volume VII

Flow Diagram- Condensate systemExtraction system

(and others as applicable)

Clarification-04 (GE) G-17 page 45 of 109 LPH1 is shown as condender mounted heater.

As per bidder's standard product offering, LP duplex type heaters are installed in condenser neck in place of simplex LP1 heater. Further the number and configuration of heaters shall be as per the HBDs submitted by the bidder. Employer to confirm.


Volume VII Flow Diagram- Condensate system Clarification-04 (GE) G-19 page 45 of 109 External drain cooler is shown for LPH1. The Provision as per bidding specification shall

prevail.

Volume VII Flow Diagram- Condensate system Clarification-04 (GE) G-20 page 45 of 109 Note8- Separate drain cooler with LPH1 is indicated. However bidder

may offer integral with LP1 as per standard and proven practice.The Provision as per bidding specification shall prevail.

Volume - IIICh2:

Sec- 2:Design Basis

Steam Turbine andits Auxiliaries 28 of 70 3.1 (v) Clarification-04 (GE) J 1- 1 page 64 of 109 Design for installation of LP heater(s) in condenser neck. The

drain cooler to be installed outside the condenser neckBidder propose to provide duplex type LP heaters in the condenser neckwithout any drain cooler as per bidder's product specific design. Agreed.

III Ch 1 2 of 5 4.1.1.1 Clarification-04 (GE)One(1) number outdoor installation type, natural circulation, single / bi-drum,pressurized furnace, water tube boiler suitable for firing LDO and having steaming capacity not less than……….

VII Flow diagram LDO unloading system 1 of 1 Clarification-04 (GE)Scheme of LDO unloading station is showing two supply line & return from two Aux.boiler and one return line from Boiler Unit 1 & 2 and also return line is shown on LDO storage tank.

Volume VIIMechanical - - Clarification -02 166(Page116 of 248) 1. Suction of Pressurizing Pump shown from LDO Day Tank

2. LDO Pressurizing Pump Return shown to LDO Day Tank.

Bidder understands that pressurising pump suction and return line shall beconnected to LDO Storage Tank and not LDO Day Tank.Please confirm bidder's understanding.

Confirmed.

Volume - III Ch2/Section-2 Steam Turbineand its Auxiliaries

Sheet 50 of 70 6.1 Clarification-04 (GE)

The flash tanks shall be provided receive the drains and safety valve connections from various equipment’s and systems. These, as a minimum, shall include Unit flash tank, turbine drain flash tanks (left & right), HP drain flash tank and LP drain flash tank.



Steam drain system

Clarification-04 (GE)Note7: Bidder may offer flash box attached to condenser, if it is their standard proven practice. No. of flash tank shall be as per this drawing & technical specification.


Volume VIIFlow Diagram of heater vent and

drainClarification-04 (GE) Flash tanks are reflected to collect the heater drains. The Provision as per bidding specification shall

prevail.

10 Volume VIIFlow Diagram -


Clarification-04 (GE) 6 (Page 44 of 109)The requirement of the orifice shown downstream of HP Bypass valve will be decided during detailed engineering as this might not be required based on the selection of the HP bypass valve supplier.


The requirement of the orifice shown downstream of HP Bypass valve will be decided during detailed engineering as this might not be required based on the selection of the HP bypass valve supplier.


9 1,2,3 (Page 43 of 109)

Bidder would like to propose flash box concept as per bidder standard practice. Also, the following flash boxes shall be offered as per bidder's standard practice due to ST protection concerns:- Turbine internal drain flash box- Auxiliary drain flash box: - Liquid drain flash box

Drawing no. 111-11-0301

Bidder would like to propose flash box concept as per bidder standard practice. Also, the following flash boxes shall be offered as per bidder's standard practice due to ST protection concerns:- Turbine internal drain flash box- Auxiliary drain flash box: - Liquid drain flash box

Drawing no. 111-11-0501

Drawing no. 111-11-0500

8

99-100 (Page 51 of 109)

Bidder would like to clarify that there is discrepancy in no of connection at LDO day tank as there is only one Aux boiler so no. of supply and return connection to LDO tank is one each. Please also clarify the boiler return line is to be connected to LDO storage tank or LDO day tank.

The Provision as per bidding specification shall prevail. Bidder would like to clarify that there is discrepancy in no of

connection at LDO day tank as there is only one Aux boiler so no. of supply and return connection to LDO tank is one each.

Bidder understands that the boiler return line is to be connected to LDO storage tank.

111-11-1300(R00) - FLOW

DIAGRAM LDOUNLOADING

SYSTEM

5

Flow diagram of HP & LP Bypass System DWG. No. 111-11-0301

HP and LP bypass spray control station with electrically operated MOVs and manual valve including bypass is not recommended as it might obstruct the desuperheater flow in case of power source failure. The electrohydraulic valve with mechanical fail-safe position during power source failure is provided in order to protect the system. Employer to confirm.Drawing no. 111-11-0301

6

Drawing no. 111-11-0600

There is contradiction in tender dwg. and specification clause 1.6(2) & (3).Control station arrangememt shall be inline with Specification clauses 1.6(2) &(3).

Flow diagram of Condensate System DWG. No. 111-11-0600

Clarification-03 192-193 (Page24-25 of 75)

There is contradiction in tender dwg. and specification clause 1.6(2) & (3).Control station arrangememt shall be inline with Specification clauses 1.6(2)

&(3).

7

Drawing no. 111-11-0600111-11-0400

Bidder understands, condenser mounted Duplex heater without drain cooler as per standard and proven practice of bidder can be offered.

Drawing no. 111-11-0600

The applicability of heater drain cooler and internal / external configuration shall be as per bidder's standars design and shall meet the requirement of applicable codes and standards.

Drawing no. 111-11-0600

Shall be dicussed and decided during detailed engineering.

Will be finalized during detailed engineering.


Confirmed.

LDO day tank shall have one inlet and outlet connection for auxiliary boiler with spare inlet and outlet nozzle.

Date-22/12/2018

Page 36 of 42



EPC PACKAGEFOR



Owner's Response



Clarification-04 (GE) 7 (Page 44 of 109)

Bidder proposes to replace the HP bypass valve warmup system (as shown in tender drawing) with a passive warmup system for HP bypass valve which will be tapped off from the u/s of the bypass valve and connected to the main steam line. The same configuration is being provided for previous executed projects. Employer to confirm.


Bidder proposes to replace the HP bypass valve warmup system (as shown in tender drawing) with a passive warmup system for HP bypass valve which will be tapped off from the u/s of the bypass valve and connected to the main steam line. The same configuration is being provided for previous executed projects. Employer to confirm.


12 Volume VII

Flow Diagram -Main steam, cold

reheat and hot reheat

Clarification-04 (GE) 9 (Page 44 of 109) Single lead has been shown for MS, CRH and HRH line.Employer to confirm that bidder can offer alternatively double leads for any or all the mentioned lines based on technical restrictions of manufacturing and stress analysis.


Employer to confirm that bidder can offer alternatively double leads for any or all the mentioned lines based on technical restrictions of manufacturing and stress analysis.


Drawing no. 111-11-0301

Drawing no. 111-11-0200

Date-22/12/2018

Page 37 of 42



EPC PACKAGEFOR



Owner's Response




Bidder understands that the LP bypass desuperheating arrangement is indicative and the system will be provided as per the requirement of the LP bypass valve supplier or steam dump device supplier. As per standard and proven practice of bidder spray in one location downstream of the LP bypass valve or in steam dump device directly shall be sufficient.


Bidder understands that the LP bypass desuperheating arrangement is indicative and the system will be provided as per the requirement of the LP bypass valve supplier or steam dump device supplier. As per standard and proven practice of bidder spray in one location downstream of the LP bypass valve or in steam dump device directly shall be sufficient.





Bidder offers to provide a passive warmup system of HP Bypass desuperheating line which is connected back to the feedwater line at a place to ensure a positive circulation. Thus the warmup line need not be routed to deaerator as shown in the tender drawing. Employer to confirm.


Bidder offers to provide a passive warmup system of HP Bypass desuperheating line which is connected back to the feedwater line at a place to ensure a positive circulation. Thus the warmup line need not be routed to deaerator as shown in the tender drawing. Employer to confirm.


15 Volume VIIFlow Diagram-

Condensate systemFeed water system

Clarification-04 (GE) 21 (Page 45 of 109) Three numbers LPHs and three HPHs (single string or double string) are shown. The number of heaters shall be as per submitted HBD. The Provision as per bidding specification shall

prevail. The number of heaters shall be as per submitted HBD. Confirmed.

16 Volume VIIFlow Diagram CW and ACW

systemClarification-04 (GE) 28 (Page 45 of 109) Valve shown at condenser inlet and outlet. Motorised Butterfly type valve shall be used for conderser inlet and outlet. The Provision as per bidding specification shall

prevail.Motorised Butterfly type valve shall be used for conderser inlet and outlet. Confirmed.

17 Volume VII Flow Diagram- Feed water system Clarification-04 (GE) 36 (Page 46 of 109) For the single string HPH option, an additiona HPH group bypass line is

shown.As individual heater bypass is provided, hence the group bypass line and valve is not applicable.


As individual heater bypass is provided, hence the group bypass line and valve is not applicable.

Confirmed. <Mistake in tender drawing>

Volume VIIFlow Diagram

Hotwell make-up & boiler fill system

Clarification-04 (GE) Unitised hotwell makeup pumps (1W+1S) for each unit is shown from CST.


Volume VIIFlow Diagram

Hotwell make-up & boiler fill system

Clarification-04 (GE) Common 1W+1S emergency make-up pumps are shown from DM storage tank.


Volume III chapter 25 LP Chemical Dosing System Sheet 4 Of 7 25.3.1 Clarification-04 (GE)

Under AVT, ammonia and hydrazine shall be dosed in the feed water atsuction lines to the boiler feed pumps as well as at the condensate pumps discharge after the condensate polishing unit.

Volume VIIP&ID-

Chemical Dosing System

Clarification-04 (GE) Ammonia & Hydrazine dosing is given to BFP Suction, CEP discharge & Boiler Fill Pump Suction.

20 Volume V Part-B 9 of 10 1.12.02 Clarification-04 (GE) 95 (Page 51 of 109)

In addition, pressure and temperature test points shall be provided for thefollowing services:(a) At the discharge of all pumps and fans(b) At the inlet and outlet of the heat exchangers for the fluid media involved(c) Adequate number at the different zones of combustor, boiler & itsauxiliaries.(d) At the inlet and outlet of each control valve(e) Adequate number at the different zones of Turbine & its auxiliaries.

The pressure and temperature test points shall be as per Bidders PG test performance philosophy after customer approval and shall be decided during detail engineering.


The pressure and temperature test points shall be as per Bidders PG test performance philosophy after customer approval and shall be decided during detail engineering.


21 III Ch 2 7 of 12 1.8.1For start-up & low load operation, 1x50% motor driven boiler feed pumps for each unit complete with booster pump along with it's drives, mechanical seals,………

Bidder offers to provide 1x30% MDBFP instead of 1x50% MDBFP which is to be used for start-up and shall generally remain as back-up. This is a proven practice being followed in the industry.

<<Was included in second set>>

Bidder offers to provide 1x30% MDBFP instead of 1x50% MDBFP which is to be used for start-up and shall generally remain as back-up. This is a proven practice being followed in the industry.


22 Volume III Ch. 2Section 2

Steam Turbine and its Auxiliaries 52 of 70 7.2 GE Prebid Clarifications - 4

S. no. 65

Emergency pointTwo turbine driven feed pumps to be capable of generating thedischarge pressure not less than 3% over steam generatorhighest safety valve set pressure corresponding to 105% ofBMCR flow.

Emergency pointTwo turbine driven feed pumps to be capable of generating the dischargepressure not less than steam generator highest safety valve set pressurecorresponding to 100% of BMCR flow.Please confirm.


Emergency pointTwo turbine driven feed pumps to be capable of generating the discharge pressure not less than steam generator highest safety valve set pressure corresponding to 100% of BMCR flow.Please confirm.


23 Volume III Ch. 27Low Pressure

Piping, Valves & Specialities

2 of 35 27.1.3 GE Prebid Clarifications - 4S. no. 82

The pipes in CW, ACW & DMCW system shall be designed to maintain a maximum velocity of 2 m/s inside the pipelines at pump discharge.

The pipes in CW, ACW & DMCW system shall be designed tomaintain a maximum velocity of 2.5 m/s inside the pipelines at pumpdischarge.


The pipes in CW, ACW & DMCW system shall be designed tomaintain a maximum velocity of 2.5 m/s inside the pipelines at pumpdischarge.

For ACW and DMCW system velocity of 2.5 m/s is acceptable.For CW system follow specification.

24 Volume III Ch 10Hotwell Makeup &

Boiler/Deaerator FillSystem

2 of 6 10.1.2 GE Prebid Clarifications - 4S. no. 72

b) Hotwell make-up (Emergency make-up)Capacity of each pump shall be designed considering minimum 20% of the condendate flow at VWO, 1% make-up condition and head to suit the system requirement.

b) Hotwell make-up (Emergency make-up)Capacity of each pump shall be designed considering minimum 12% of the condensate flow at VWO, 1% make-up condition and head to suit the system requirement.Owner to please confirm acceptance.


b) Hotwell make-up (Emergency make-up)Capacity of each pump shall be designed considering minimum 12% of the condensate flow at VWO, 1% make-up condition and head to suit the system requirement.Owner to please confirm acceptance.


25 Volume III Ch 15 CW & ACW System 9 of 49 15.6 (A) (c )

The selected head of CW pump shall provide for adequate margin sothat pumps are capable of supplying equipment design flow at 47.5Hz frequency of power supply.

<< New point >>

The selected head of CW pump shall provide for adequate margin so that pumps are capable of supplying equipment design flow at 50Hz frequency of power supply.

Owner to please confirm.


Bidder clarifies that, hotwell emergency make-up shall be done from DM water transfer pump outlet and separate emergency make-up pumps are not required. Please confirm.

19 51-51 (Page 47 of 109)There is a discrepency in the Hydrazine & Ammonia dosing of boiler fill pump suction. As per bidder's proven practice bidder offers OT dosing Please Clarify.

One (1) O/H tank (MS construction) of 50 M3capacity on bunker bay roof of each unit shall be

considered

The reply is not relavent. Bidder Clarifies that as per provent practice, only Ammonia dosing and O2 dosing shall be provided for BFP suction and CPU outlet. And only Ammonia dosing for Boiler fill pump suction.Hydrazine dosing is not envisaged.

Drawing no. 111-11-0901A

Drawing no. 111-11-0600111-11-0700

Drawing no. 111-12-3308

Drawing no. 111-12-3300

Drawing no. 111-11-0700

18

Drawing no. 111-12-3308

40-41 (Page 46 of 109)

Bidder proposes to provide the normal make-up from DM transfer pumps (3x50%, common) outlet and emergency make-up from CST through emergency make-up pumps (2x100%, common). Also additional hotwell make-up pumps are not applicable.

Drawing no. 111-11-0301

Drawing no. 111-11-0301

Confirmed.

Confirmed.

Date-22/12/2018

Page 38 of 42



EPC PACKAGEFOR



Owner's Response

26 Volume III Ch 16 DMCW System 3 of 12 16.2 GE Prebid Clarifications - 4S. no. 67

Capacity of pumps shall be fixed by taking 10% (minimum)margin on design DMCW flow.

Capacity of pumps shall be fixed by taking 10% (minimum) margin onrequired DMCW flow.Owner to please confirm acceptance.


Capacity of pumps shall be fixed at design DMCW flow. Design DMCW flow includes 20% margin over actual DMCW requirement.Owner to please confirm acceptance.

Confirmed.

Date-22/12/2018

Page 39 of 42


For such large capacity pumps, the BFP OEMs have requested Bidder to restrict the no. of stages to as minimum as possible so that vibration and other undue issues can be avoided.Accordingly, Bidder requests purchaser a limit of 800 m in place of 670 m, which is based on proven and experienced manufacturers practice.

The Provision as per bidding specification shall prevail Confirmed.

TDH per stage shall be as per OEM design. Higher TDH per stage limit upto800 mwc may be allowed inline with recent NTPC practice.Please confirm acceptance.

Confirmed. TDH per stage shall be as per OEM design. Higher TDH per stage limit upto800 mwc is accepted.

Volume-III Chapter-2, Section -2

Steam Turbine and its Auxiliaries

38 of 70(256 of 1106) 3.9 ix)

CEP Motor rating at 50 deg.C ambient temperature shall not be less than the maximum load demand of its driven equipment in its entire operation at frequency variations from 47.5 Hz to 51.5 Hz

The Provision as per bidding specification shall prevail



45 of 70(263 of 1106) 5.3.1 ix)

Drip Pump Motor rating at 50 deg.C ambient temperature shall not be less than the maximum load demand of its driven equipment in its entire operation at frequency variations from 47.5 Hz to 51.5 Hz




56 of 70(274 of 1106) 7.3.1 xxii)

BFP maximum continuous motor rating corresponding to maximum cooling water temperature at cooler inlet not less than the maximum load demand of driven equipment at its entire range of operation at frequency variations from 47.5 Hz to 51.5 Hz.


Volume-IV Chapter-1Electrical Scope of Work andDesign Criteria

30 of 48(49 of 732) 1.27.06

Maximum continuous motor ratings shall be at least 15% above design duty point or the maximum load demand of the driven equipment under entire operating range taking into account voltage and frequency variation.


Volume-IV Chapter-14 AC & DC Motors 5 of 20(331 of 732) 1.27.06

Continuous motor rating shall be arrived at considering 15% margin over the duty point input or 10% over the maximum demand of the driven equipment, whichever is higher, considering highest system frequency and voltage variation.


Bidder proposes that this type test requirement may please be relaxed as over a period of mutiple projects we have never seen any marks on the pump impeller casing etc after doing the dry running test. However forcibily running the pump in dry condition is not advisable unless otherwise required in case of any emergency for which the pump OEMs are already giving the confirmations.


Dry run test for BFP is not envisaged. However, the offered BFP will becapable of safe coasting down to rest, upon any inadvertent closure ofsuction valve. Adequate protections & interlocks will be built into the systemto prevent dry running of the pump for extended length of time. Boiler feedpumps are not tested for dry run for supercritical power plants, as per OEMrecommendations.Please confirm acceptance.

Type test certificate is also acceptable.

4 Volume-III Chapter-2, Section -2


55 of 70(273 of 1106) 7.3.1 xvii)

Clarification-4 Pg-62 of 109 Sl. No. I-14

xvii) Materials Bidder would like to mention owner that material of construction for BFP shall be as per pump suppliers proven & standard practice. Please confirm


This requirement is not technically feasible for acceptance by GE

Material as per OEM practice.

Volume-V Part B/Ch 11ControlValves With Actuators

3 of 9(455 of 678) 11.02.06


The Liquid pressure recovery factor (FL) shall be 0.995 or better for severe flashing/cavitation services.

Volume-V Part B/Ch 11ControlValves With Actuators

3 of 9(455 of 678) 11.02.07


The Liquid pressure recovery factor (FL) shall be 0.985 or better for low flashing/cavitation services.

6 Volume-V Part B/Ch 11ControlValves With Actuators

6 of 9(458 of 678) 11.07.02


Separate moisture separator unit for ensuring dryness of air entering I/P as well as the power cylinder is to be supplied with each control valve and control damper.

Owner to please note that the Moisture Separation Unit cannot be a part of Control valve. Dryness of air entering the control valve shall be ensured by Air dryer after air compressor (which is a part of Instrument air package)Owner is requested to accept the same.


Shall be decided during detailing engineering

Noted.

T. WATER TREATMENT SYSTEM

Owner's Response BIDDER'S QUERY



55 of 70(273 of 1106) 7.3.1 xvi) xvi) TDH per stage for the main pump shall not exceed 670 mwc.

Clarifications accepted for other bidders but rejected for GE.Bidder requests SJVUNL to accept GE Clarification in line with other bidder.


7.8 iii)

refernce sl no. (as per customer replies) Bid Specification Stipulation

EPC PACKAGEFOR



Dry running withstand capability test onone BFP and preferably with corresponding BP.

Clarifications accepted for other bidders but rejected for GE/ Discrepancy in tender specification not yet clarified .Bidder would request owner to clarify.

Statement of Clarification sought

Sl. No.- I- 33, Page - 64 of 109,

Clarification -04

Owner to please note that the CEP/Drip Pump/BFP Motor rating shall be higher of following:- 10 % margin from design point case power - Maximum load demand of driven equipment with frequency variations from 47.5 Hz to 51.5 Hz.

Owner is requested to accept the same.

Clarification-2 Pg-64 of 248 Clarification

No. 69

Discrepancy in tender specification not yet clarified. Bidder would request owner to clarify.

Type test certificate is acceptable.

2

Sl.No. Owner's response

All Motor rating shall be higher of following:- 15 % margin over duty point power consumption - Maximum load demand of driven equipment with frequency variations from 47.5 Hz to 51.5 Hz.


5

Owner to please note that the Liquid pressure recovery factor (FL) shall be 0.985 or better for Critical valves and 0.9 or better for Non Critical valves. This is as per standard practice followed by other utilities.

Bidder request owner to kindly accept the proposal.





63 of 70(281 of 1106)


Date-22/12/2018

Page 40 of 42

Vol Ch/Sec. Title page ClauseOwner's Response BIDDER'S QUERYrefernce sl no. (as per

customer replies) Bid Specification Stipulation

EPC PACKAGEFOR



Statement of Clarification soughtSl.No. Owner's response


7 Volume-V Part B/Ch 2Field &Measuring Instruments

38 of 63(167 of 678) 2.14.00

Sl. No.-G- 168, Page 200 of 248,

clarification - 02

Solenoid valves shall be provided as per NAMUR standard with control valves.

Owner to please note that Namur type Solenoid shall be directly mounted to Actuator and hence Actuator shall also be of Namur type. Also the same is required to acheive the faster action, hence the same is not required. Hence the Bidder will offer equivalent to Namur type Solenoid valve (Rotex, Asotec, etc) for Control Valves. Owner is requested to accept the same.




35 of 70(253 of 1106) 3.7 vii)

Sl. No.-I- 04, Page 61 of 109,

clarification - 04

Vacuum Pump ITD= Saturation temperature corresponding to optimized condenser pressure for the respective condenser shell (which is considered for guaranteed condenser pressure) - specified cooling water inlet temperature to vacuum pump seal water cooler.

Owner to please note that ITD at HEI design case shall be = Saturation temperature corresponding to HEI design case pressure (33.8 mbar(a))- cooling water inlet temperature to vacuum pump seal water cooler (13deg.C). Please confirm the acceptance

The Provision as per bidding specification shall prevail GE would like to discuss again with client




49 of 70(267 of 1106) 5.4 (xiii)

Sl . No.- G-64, Page 48 of 109,

Clarification- 04

… bidder shall carryout the transient analysis of BFP suctionsystem considering the following conditions:-iii) Deaerator at low-low level.

… bidder shall carryout the transient analysis of BFP suctionsystem considering the following conditions:-iii) Deaerator at low level.Owner to please confirm acceptance.

The Provision as per bidding specification shall prevail GE would like to discuss again with client




59 of 70(277 of 1106) 7.7.2 i)

Sl . No.- I-19, Page 63 of 109,

Clarification- 04

Design of BFP Drive Turbine: Design of drive turbines shall be generally in accordance with API 612 and 614 except… Testing in accordance with ASME PTC-6.

Bidder would like to clarify that the API design is not required for Power plant BFP drive turbines. The same shall be in accordance with IEC or other standards as per manufacturers proven design.

Further Bidder clarify that performance of BFPDT will be measured as a part of overall PG test done for the STG, as per ASME PTC-6Owner is requested to confirm.

The Provision as per bidding specification shall prevail GE would like to discuss again with client Refer Amendement-

08, Sr. No,-07

11 Volume-III, Chapter-2,Section 2


54 of 70(272 of 1106) 7.3.1 (vii)

Clarification-2, Pg-53 of 248 Sl. No.

C-39

MD-BFP lube oil systemCommon lubricating oil system shall be provided for main BFP,booster pump, motor and hydraulic coupling with 2X100% ACmotor driven auxiliary oil pumps (if there is no shaft driven inMDBFP) & 1X100% AC motor driven auxiliary oil pumps (if there isshaft driven in MDBFP), two full capacity each of working oilcooler/lube oil cooler/ oil filters/ strainers and piping, valves,fittings, instruments etc. as required.

As per proven and standard practice of Bidder and OEM, 1x100% AC motor driven auxiliary oil pump and 1x100% shaft driven oil pump is envisaged for MDBFP. Bidder further proposes to consider 1x100% lube oil cooler, 1x100% working oil cooler, as the MDBFP is a stand-by equipment. Also, Bidder would like to highlight that this is the standard configuration offered by the reputed OEM of hydraulic coupling i.e Voith.Please confirm acceptance.

Confirmed.Bidder to consider 2x100% lube/working oil cooler. GE would like to discuss again with client


Date-22/12/2018

Page 41 of 42

Sl.No. Part Sub Section

Titlepage Clause No Specification / Customer Bidder's Query

1 Volume II Ch 8 20 of 78 3.10.1

3.10 AUXILIARY POWER CONSUMPTION3.10.1 Unit Auxiliary Power ConsumptionThe unit auxiliary power consumption shall be calculated using the following relationship.Pau = Pu + TL (Unit)Pau = Guaranteed Unit Auxiliary Power Consumption.Pu = Power consumed by the auxiliaries of the unit under test.TL = Losses of the transformers supplied by bidder based on works test reports for unit.

Bidder requests Owner to please clarify the applicable Power transformer required to be considered under transformer losses (TL) while calculating the Unit aux. power consumption in line with specified relationship.

1. GT, UT and 11/3.45KV & 11/0.433KV transformers fed from 11kV Unit Switchboards shall be considered in "Unit auxiliary power consumption".2. ST, ICT, Reactor and 11/3.45KV & 11/0.433KV transformers fed from 11kV Station Switchboards shall be considered in "Station auxiliary power consumption".

2 Vol VII SLD Dwg. No.112-10-0100 1 of 2 112-10-0100 Key Single Line Diagram: Dwg no. 112-10-0100

Bidder observed that in Single line diagram (SLD) dwg. no.112-10-0100 , provision required to be considered for back charging or start up power arrangement are not shown in the SLD and neither specificed in contract specification.

In view of the same, Bidder requests owner to please confirm the philosphy for the start up arrangement envisaged for this 2X660 MW Buxer power plant.

Back charging shall be done using ST.

3 Vol VII SLD Dwg. No.112-01-1212

SLD Dwg. No.112-01-1212 1 of 1 112-01-1212

Bidder observed that electrical scheme envisage for Ash dyke/Ash pond area are not specifically mentioned in SLD Dwg. No. 112-01-1212.

Bidder request owner to please provide the propose scheme arrangement required to be considered for the same .

Follow Tender Drg No. 112-01-1212. AWRT-B transformer shall be fed from 2SA.From 11kV switchgear upto boundary cables shall be used. Beyond the boundary 11kV overhead lines shall be routed along the pipeline. Off Load Break Isolator to be provided before each transformer.

4 Vol V Part B/Ch 3 DDCMIS 46 of 85 DDCMIS

e) Digital/Electronic Over speed protection & Monitoring systemshall be provided with TMR configuration. This system shallcomply the requirements of latest edition of IEC 61508, IEC61508, SIL3, API 670 and API 612 requirements. System shallbe SIL 3, TUV certified only.

Bidder understand that TPS will be provided with TMR.

Bidder understanding is correct. Over speed protection & Monitoring system shall be with TMR Configuration and shall comply with IEC 61508, SIL 3, API 670 & API 612 requirements. System shall be SIL 3, TUV certified only. Bidder to confirm.

Owner's ResponseU. ELECTRICALU1. Additional

EPC PACKAGEFOR



Date-22/12/2018

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Date-22/12/2018 · floor and MDBFP - 0.0 M Floor. The provision as per bidding specification shall prevail. 7.9 Location of TDBFPs & MDBFP TDBFPs to be preferably located on operating