Date-16/02/201 EPC PACKAGE BUXAR THERMAL POWER … · Ch11 : QAP (Mechanical) 15.11 & Sec-M5,CW...

Sl. No. Volume No. Section/ChapterNo. Clause no. Description as perdocument Query from Bidder Owner's Reply/Clarification

Volume VI Ch-10 10.14 Allowable Settlement:The total permissible settlement ….. Maximum

Volume VI Ch-13 13.14

Type of foundation Pile

Geotechnical Investigation Report Vol I

9.0 Recommendation

sPage -33

a. As per caluse no. 10.14 of Vol VI andGeo technical investigation report, Raft foundation can be provided but as per Clause no. 13.14 of Vol VI, pile foundation is to be provided for IDCT. Please confirm which type of foundation is required - pile foundation or raft foundation?

b. If raft foundation is required, pleaseprovide the bearing capacity corresponding to 25mm settlement as in Geo tecnical report, bearing capacity for only 40mm settlement is given.

Bidder may decide type of foundations for IDCT as per the Study/Design/Soil Investigation carried out by the bidder.

Bearing capacity corresponding to 25 mm settlement shall be worked out by the bidder.

1

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BUXAR THERMAL POWER PROJECT (2X660 MW)

PREBID CLARIFICATION-18

A. CIVIL

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Sl. No. Volume No. Section/ Chapter No. Clause no. Description as per tender

document Query from Bidder Owner's Reply/Clarification

1 Volume IIGenerals & Schedules

Ch 4: Provenness 5.4 Pg. 30 of 40

5.4.3) The transformer considered for the above (5.4.1) should have been successfully short circuit tested.

Customer specification has called for short circuit report of the same transformer for which the performance has been given by the end client.

It is a very rare instance where the transformer for which the performance certificate has been furnished by the end client was also short circuit tested. Accordingly customer to also consider any other similar or higher rating transformer’s short circuit report for this clause.

Bidder has faced issues in past where the criteria had to be relaxed by end client post award of contract during detailed engineering as very few bidders were only able to meet the criteria and thus restricting the participation of bidders.

Provision as per Bidding Specification shall prevail.

2 Volume IIGenerals & Schedules

Ch 4: Provenness 5.10 1.1kV Power Cables Pg. 33 of 40

(a) Atleast 100 km of aluminium conductor, XLPE insulated, PVC sheathed power cables of 1.1kV or higher grade in one single contract

(b) Atleast 100 km of aluminium conductor, PVC insulated, PVC sheathed power cables of 1.1kV or higher grade in one single contract

Criteria for applicable type of Cable (i.e. LT Power XLPE i.e. condition a) shall be fulfilled and not for both XLPE & PVCcables when only one of them is applicable for the project.

Criteria for applicable type of Cable (i.e. LT Power XLPE shall be fulfilled.

B. ELECTRICAL

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SEC / PART SUB SEC. PAGE NO. CLAUSE NO.

1

Volume-IV Chapter 2 RCC Chimney

4/22 12.3.8 Chimney shall be designed without considering provision of strakes.

Due to very high across wind response, strakes may be permitted to counter across wind response. Kindly confirm.

Confirmed

2

Volume-IV Chapter 2 RCC Chimney

4/22 12.3.8 The across wind response of the Chimney will be evaluated as per IS:4998 (Part-1)/ACI307-98.

The across wind response of the Chimney will be evaluated as per IS:4998 2015 (Part-1), kindly confirm.

IS:4998 2015 (Part-1) is confirmed.

C. RCC Chimeny

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S. NO.

SPECIFICATION REFERENCESPECIFICATION REQUIREMENT BIDDER'S QUERY Owner's

Reply/Clarification

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PREBID CLARIFICATION-18 Sl. No

Volume / Section Page No. Clause No. Description Bidder’s Query Owner’s Reply/Clarification

D. Heating Element 1. III Ch.1,

Sec-2 29 of 120 2.9.1 V) 2a). Heating elements –

a) Cold end:A cold end tier of elements shall bedesigned deep enough to encapsulate anyAmmonium Bisulphate (ABS) and acidcondensation fouling within the cold endtier.Made of vitreous enameled steel withminimum 1.0mm thick base and additional0.15 mm enamel thickness on each side.

b) Hot/ Intermediate end:Made of carbon steel minimum 0.8mm thick. Hot end element height shall be selected to avoid any ammonium bisulphate (ABS) condensation.

As per Pre-bid clarification -2 Sl.No.67, For enamel the thickness of sheet used shall be 0.75 mm and additional 0.15mm enamel thickness on each side.

Owners reply of Corrigendum-40 (Pre-bid Clarification-16) dt. 02-02-19, under Sr. No 15 of Page no 17/34 is re-produced below.

“Enamelling of APH elements or corten steel with minimum1.0 mm thickness for hot end 1.2mm thickness for cold end shall be considered.”

1.2mm thickness corten for cold end is in line with normal practice. However, for hot end 1.0 mm thickness is not required and not used by anybody. As the cold end depth is designed deep enough to encapsulate ABS within cold end, Bidder request to accept 0.8mm thickness Carbon steel for hot end elements in line with the practice for all SCR contracts & Talcher 2x660MW tender and also in line with Buxar original tender.

Material for heating element shall be as follows:

Cold end: Vitreous enameled steel with minimum 1.0 mm thick base and additional 0.15 mm enamel thickness on each side/corten steel with minimum 1.2 mm thickness.

Hot End: Carbon steel with minimum 0.8 mm thickness.

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Sl. No. Volume No. Section/Chapter

No. Clause no. Description as per tender document Query from Bidder Owner's

Reply/Clarification

1 Volume IIIMechanical Works

Ch 1: SG & AuxiliariesSection 2 : Design Basis ofSG & Auxiliaries and SCRSheet | 32 of 120

2.10.1. General

iii) Coal Bunker(s)(a) Circular bunkers one for each mill shall be provided.(b) Total storage capacity of all bunkers for each unit shallcorresponding to 12 hours requirement under BMCR condition with worst coal firing. All bunkers shall be of equal capacity.

Customer Clarification-16 reply dtd 02.02.2019(C-Mechanical works, Sr. No.1)Last bunker feeding shall be through head discharge pulley of bunker feeding conveyor(s) which warrants bigger diameter bunker. To accommodate the same, we propose to have last bunker in bunker bay (for side/rear/front mill arrangement) with bigger diameter ensuring that bunker capacity corresponding to minimum 12 hours requirement under BMCR condition with worst coal firing is maintained.Owner's Reply:-Confirmed.Bidder's Additional Query-Last Bunker feeding shall be through head discharge pulleys of bunker feeding conveyors .To accommodate the openings of chutes of head discharge pulley within the last bunker, we propose to provide a 'Transition Piece' between the tripper floor & cylindrical portion of bunker at the last bunker of the bay. Please confirm.

Confirmed

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Sl. no Vol No. Section/Part/

Chapter Clause No. Page No. Specification Statement of Clarification Owner's Reply/Clarification

1 Vol-III CH-2, SEC-2 5.5.1.(ii) 50 of 70 HP Heater:Water box channel as per SA266 Cl2

Owner may please confirm for water box channel of HP Heaters (being Hemi Head) made of pressed CS (SA516 Gr.70)

Confirmed

2 Vol III & Vol II

Ch 15:CW & ACW System &Ch11 : QAP(Mechanical)

15.11 &Sec-M5,CW Pump, Note-5.

19 of 49& 56 of 94

PERFORMANCE GUARANTEE TESTS of CWPs &Performance testing of Pumps shall be carried out at shop, as per HIS standard to determine Head & Flow Characteristics.

Model test of CW pumps as per JIS B 8327 will be carried out to predict the performance of the prototype CW Pump. Customer is requested to waive off the proto type test and performance test of all pumps with the actual motor. Performance test of all CWPs will be carried out at Site as proto type test is very costly affair.

Not Acceptable.Provision as per bidding specification shall prevail.

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Sr. No.

Section/Part/Chapter/Volume

Clause No. Page No.

Bidding Document Specification Statement of Deviations/Variations/Exceptions Owner's Reply/Clarification

Volume IV /Annexure – XI chapter 35

Clause. 35.05.03

As per technical specification, Short Circuit test to be conducted on Autotransformer. We request that Customer may please review the requirement and consider the procedure adopted by POWERGRID for this test because of following reasons: i) BHEL has excellent record of short circuit testing for variousrating of Power transformers. Recently, 315 MVA, 400/220/33 kV, 3-phase Auto transformer was successfully short circuit tested at NHPTL, Bina for NTPC Tanda project. Our design and facilities has well proven for Short circuit testing. The offered 500 MVA ICT for this enquiry is design as per the same philosophy & design practice as followed for 315 MVA ICT for NTPC.

Annexure –VIII ofAddendum -02

ii) SC test is a special test and very costly also. Moreover,Transformer will be sent for short circuit testing to a laboratory, which will require total period of approx. 6 months, for performing short circuit test.

Test Clause no 33

1 3 Short Circuit Withstand Test

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iii) For 500 MVA ICT, POWERGRID considers the Short Circuittest report of 315 MVA ICT and validates the short circuit withstand capability based on calculations as per IEC 60076-5. The calculation are being furnished during detail engineering.

Not Acceptable. Provison as per bidding specification shall prevail.

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Sl.No.

Amendment/ Clarification

ReferencePart Sub

Section Clause No Specification / Customer

Bidder Query Owner's Reply Clarification Requested Owner's Reply/Clarification

Clarification No 16

Volume III Section -1, Chapter 1 SG and

Auxillaries

1.1.15.3.i) , 2.3.1 & 2.10.5.2,

1)

Minimum number of coal pulverisers to be provided for each steam generator shall not be less than eight (8).

1.1.15.3.i) Minimum Eight (8) no’s of coal pulverizers shall be provided for each steam generator.

2.3.1 Minimum number of coal pulverisers to be provided for each steam generator shall not be less than eight (8).

2.10.5.2,1)

Sizing of Coal PulverisersNumber of mills for Steam Generator - Adequate to achieve 100% TMCR for all specified coal(s) and all operating conditions but not less than eight (8) mills.

_ Volume III Section -1, Chapter 1 SG and Auxillaries

2.10.5.2,3.a

Maximum permissible mill loading for deciding mill capacity (selection of mill type/model) complying with requirement at clause 2.10.5 above:

85% or the mill loading achievable corresponding to the near worn out conditions of mill grinding rolls/balls/tyres etc. whichever is less. This condition shall be compliedfor the range of specified coals including the adequacy range of coals.

6 Mills operating with 90% loading at 100% TMCR for worst coal with 1 mill standby

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6 mills operating with maximum90% loading at 100%TMCR forall specified coal with one standby.

Bidder Understands 90% Mill Loading should be considered instead of 85% per Clause No 2.10.5.2, 3.a.

However Bidder would like to inform that requirement as specifed in reply i.e "at 100%TMCR for all specified coal with one stand by" is in contradiction to the Redundancy Criteria specified in Tender in Vol III Page 37 of 120 vide Clause No 2.10.5.2, 2.a i.e "At 100% of TMCR, (660 MW unit load) worst coal firing - One"

Bidder requests that the Redundancy Criteris shall be as specfied in Clause 2.10.5.2, 2.a i.e for 100% TMCR WOrst Coal- One Standby instead of 100% TMCR for all specified Coal.

Thsi is also inline tpo the CEA Guidelines.

Proposed Condition is as follows: "6 mills operating with maximum 90% loading at 100%TMCR for all specified coal Worst Coal with one stand by."

1

Clarification No 16 dated

Bidder would like to inform CEA guidelines for "STANDARD TECHNICAL FEATURES OF BTG SYSTEM FOR SUPERCRITICAL 660/ 800 MW THERMAL UNITS" on Page no.25 of 61 under Clause 8.5.2 i) Sizing of Coal Pulveriser ( Attachment -1) mentions that "Number of Mills for each Steam Generator " Adequate to achieve 100% TMCR for all specified coal(s) and all operating conditions, but not less than six (6) mills for 660 MW unit and eight (8) mills for 800 MW unit. ". ,

However, it also mentions under Page no.26 of 61 under Clause 8.5.2 iii) "Sizing of Coal Pulveriser

"Maximum permissible mill loading for deciding mill capacity 90% or the mill loading achievable corresponding to the near worn out conditions of mill grinding rolls/balls/tyres etc. whichever is less. This condition shall be complied for the range of specified coals including the adequacy range of coals."

This requirement of Max 90% Mill Loading is also mentioned in NTPC Tender of Talcher (Attachment 2) wherein as stated by other Bidder, No.s of Mills have been reduced to minimum 7 in amendment.

Bidder would request SJVNL to allow the Bidder to follow the requirement of CEA Guideline for max permissibile Mill loading of 90% which is also inline with all NTPC Tenders including Talcher.

Volume III Section -1, Chapter 1 SG and

Auxillaries

H.

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Sl. No. Part Sub Section page Specification / Customer Addendum Clarification

1 Addendum -4 5.40 NOx Control Systems

2 of 155 (i) SCR system Efficiency for Control of NOx EmissionContractor shall guarantee and demonstrate at the time of boiler efficiency test and withthe originally installed catalyst (i.e. without the use of future layer of catalyst) the SCRefficiency for control of NOx emission (from thermal as well as fuel) shall not be lessthan 80% at 6% Oxygen (O2) content in flue gas on dry gas basis and ammonia slip notexceeding 3ppm at 40-45% TMCR load condition, when firing any coal from the rangeof coal (s) specified.

Bidder would like to inform that the SCR System Efficiency for Control of Nox Emmission is already Captured under Category -1 Guarantees under Chapter 8, Volume II, Function Guarantees, Clause No 3.1.vii.

Therefore specifying the same again in Guarantees Under Category III leads to duplication of the Guarantee.

Bidder would like to request Owner to remove the same from Category III being already captured under Cat I Guarantees.


2 of 155 (ii) NOx Emissions at SCR OutletContractor shall demonstrate that over entire range of steam generator operation from40% to 100% TMCR load and for whole range of specified coal(s), the total NOx (fromthermal as well as fuel) at the inlet of SCR shall not exceed 100 mg/Nm3 at 6% oxygen(O2) content in flue gas on dry gas basis .

Bidder would like to inform that Nox Emission at SCR Outlet is already specified under Category II Guarantees in Chapter 8, Volume II, Function Guarantees, Clause No 4.1.1. Therefore specifying the same again in Guarantees Under Category III leads to duplication of the Guarantee.

Bidder would like to request Owner to remove the same from Category III being already captured under Cat 2 Rejection Guarantees.

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I.

Owner's Reply/Clarification

Refer Amendment - 20


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Sl. No. Part Sub Section page Specification / Customer Addendum Clarification

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Owner's Reply/Clarification


2 of 155 (iv) SO2 to SO3 Conversion RateContractor shall guarantee and demonstrate that maximum SO2 to SO3 conversion rateshall not exceed 1% for the entire range of coal(s) specified for an operation period of16,000 hours. SO2 to SO3 conversion rate shall be demonstrated during the SCREfficiency test for Control of NOx emission at beginning as well as end of the catalystlife. Further, SO2 to SO3 conversion rate shall also be determined based on the catalystsample taken for laboratory test within the guarantee period.

Bidder would like to inform that SO2 to SO3 Conversion Rate is not specified as a Guarantee under Chapter 8 Volume II Function Guarantees. Clause No 4.1.1.

Bidder would like to request Owner to remove the same.

4 Amendment -18 &

Clarification No 8

Attachment 6 (p) Rev 01 Point X).e

4 of 87 (b) Classifier cone and other items lined with ceramic material (hours of Operation)(e) Ceramic material wherever provided (hours of Operation)

Owner vide Clarification no 8, Sr No 37, Page 12 of 42, has replied "Tender condition prevails. Instead of Cone & Vane, replace with Dynamic Clarifier".

Bidder would like inform that in Attachment 6(P) Rev 01 under ClauseX.) (b) and (e) are pertaining to Cermaic Lining are not applicable for Dynamic Classifiers. Therefore please remove the same/ put "as applicable for Bidder's Design.

If as per bidder's design, ceramic lining is not applicable, the same may be written in Attachment 6(P)-Rev-01


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Sl. No Part

Sub Section Clause No pageSpecification Bidder's Query

Owner's Reply/ Clarification

Amendment-17 Attachment-6(P)

Limestone Consumption Rate (at Design Coal) For increase in limestone consumption of FGD system in kg/hr/unit under condition stipulated in clause 3.1 (xii) of this Sub-Section of Technical Specification

Volume-III- Mechanical Works

Ch 6: Flue gas desulphurisation

6.3 14 of 54 Bidder will meet the efficiency requirements both at design and guarantee point as specified in FGD sizing criteria. a. Design Point : BMCR load with worst coal, 45oC and 60% RH ambient conditionb. Guarantee Point : TMCR load with worst coal, 27oC and 60% RH ambient condition

Volume-II- Mechanical Works

Ch 8 : Functional Guarantee & Liquidated Damages

3.1 (xii) Sheet 7 of 78 xii) Limestone Consumption Rate Limestone consumption of FGD system in kg/hr under guaranteepoint conditions.

2 - Clarification-12 Civil- 1 10 of 13 The water Drawl Study by WAPCOS i.e. WAPCOS report is for reference purpose only. Bidder has to carry out his own assessment, Study, design and construct the raw water intake system to make the system fully operational as per requirement of power plant ensuring adequacy of plant operation. The study, design and construction shall be carried out as per relevant guidelines, standards and BIS codes. A land measuring about 4.5 acres is presently under acquisition for raw water intake system on the bank of Ganga river.

Owner is also requested to provide the co-ordinates of referred 4.5 acre of land, where the intake well system is to be installed.

Location of the intake complex area presently under acquisition shall tentatively be 350 m downstream of the State Govt. Intake on Ganga River's right bank as mentioned in the WAPCOS Report. However, the Bidder has to carry out his own assessment, Study, design and finalize the exact location of the well within the premises and construct the raw water intake system to make the system fully operational as per requirement of Power plant ensuring adequacy of plant operation. The study, design and construction shall be carried out as per relevant guidelines, standards and BIS codes.

3 Vol. V Part B/Ch 16: PlantSecurity andSurveillance system

16.06.00 - (i 10 of 17 The camera for FOPH and Fuel oil tank area shall be explosion proof type and forCHP area, camera shall be flame proof type only.

Bidder's Query:Bidder wants to clarify that for FOPH & Fuel oil tank area, Explosion proofcameras are considered. For CHP area, flameproof cameras are not envisaged as no OEM manufactures flame prooof cameras. Hence, in CHP area, bidder requests to accept PTZ dome type cameras with 70m range.

SJVN/Desein Reply (Clarification-16, Sr. No. 10):Not acceptable.Please comply with specification. Reasonable No. of suppliers are available in the market.

Bidder once again requests to accept explosion proof cameras for CHP area instead of flame proof cameras as the same is not available in the market.

Please confirm acceptance.

Explosion proof cameras shall be provided for CHP area instead of flame proof cameras.

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Refer Amendment-20J. FGD

Clause 3.1 (xii) stipulates to guarantee limestone consumption rate under "guarantee point condition". The Guarantee point condition for FGD is defined in cl. no. 6.3 (b) of Chapter-6, Vol. III which is at worst coal.

In line with Sr. No. xii of Attachment6(P) issued vide Amendment-17, we request you to kindly replace "worst coal" with "design coal" in cl. 6.3 (b) above and modify above cl. 6.3 (b) as follows:

b. Guarantee Point: TMCR load with Design Coal, 27 degC and 60% RHambient condition

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Sl. No Part

Sub Section Clause No pageSpecification Bidder's Query

Owner's Reply/ Clarification

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J. FGD

Volume VI Ch 02 : Scope of WorkSheet | 8 of 11

A RCC retaining wall shall be provided at the junction of different gradelevels with provision of stepped stair cases/ramps at different grade levellocations for easy movement of persons, etc.

Amendment-16 Sr. No.2 Natural Soil Level (NSL) of the entire plot area varies approximately between 57.00 m to 66.00 m levels. High Flood level (HFL) at project site corresponding to 1 in 100 years return period is62.85 m. Formation level of the main plant area including area earmarked for 3rd unit shall be kept at +64 m as marked “A” in attached Plot Plan (Annexure-I). The formation level of the areaearmarked for CHP, railway Infrastructure Bulb Area, Coal Handling Plant. Stock Pile area etc. (i.e. entire area lying between main plant area and Ash Pond area) shall be kept at +63 m as marked “B” in Attached Plot Plan (Annexure-I). The formation level of all the roads except Ash Pond Area shall be kept at +64m. Road level of the plant is to be kept +0.25 m to +0.3 m above formation level and finished floor level of all buildings is to be kept +0.5 m above formation level in the respective portions.

Provision as per bidding specifications shall prevail.

However, Grade level junction between plant area & area earmarked for 3rd unit expansion (+64.00 M level marked as Area 'A') and Railway Bulb area & CHP Area (+63.00 M level marked as Area 'B') shall be matched with appropriate slope with suitable slope protection measure.

f) The following tests shall be carried out as a minimum requirement:-aa) Dielectric testsbb) Temperature rise testcc) Internal arc testdd) Making and breaking testsee) Rated peak withstand current and rated shorttime current tests on main and earthing circuitsff) Operation & mechanical endurance tests.

Final replies by SJVN dated 22.12.2018Type test older than five (5) years shall not be valid from manufacturers qualified against S.No.5.16 of Ch.4 of Vol.IIBidder's Query on 28-Jan-2019Bidder requests customer to accept Type Test Reports of GIS older than five (5) years also. Conduction of Type test in event of failure to meet five (5) years criteria shall attract huge cost and time and may impact project timelines. Also, there is no much variation in GIS Technology/Design over the past 10-15 years. Hence a Type Test Report older than 5-years, of Indian Manufacturer or their Parent Company, shall also serve the purpose. Please accept. Further in view of the above Bidder also does not envisage to fill-up the Type test Charges against Schedule 8A & 8B.SJVN replies dtd. 04-Feb-2019The provision as per specification shall prevail.

Bidder once again requessts to accept the following:

In case the Contractor has conducted such specified type test(s) according to the relevant standard and/or specification within last ten years as on date of bid opening, type test reports is acceptable. Type test report of parent company is also acceptable.

Also, Bidder understands that items for which type test reports are available and the same have been accepted in tender specifications OR pre-bid clarifications/amendments thereof, bidder need not submit/mention type test value in Schedule-8A/8B.

Please confirm.

Type tests older than Ten (10) years shall not be valid from manufacturers. Type test report of parent company is also acceptable.

Items for which type test reports are available and the same are acceptable as per tender specifications OR pre-bid clarifications/amendments thereof, bidder need not submit/mention type test value in Schedule-8A/8B

62 of 71 29.41.02 f)Chapter 29400kV Gas Insulated Switchgear

Volume-IV4

Bidder proposes to provide earthen slope with slope protection at the junction of different grade levels instead of RCC retaining wall.

Please confirm acceptance.

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Sr. No.

Amendment / clarification reference

Section / Part /Chapter / Volume Clause No. Page no. Bid Specification Stipulation Statement of

Prebid Queries & Clarification Owner's Reply Bidder's Query Owner's Reply/Clarification

1 Clarification - 7(Page 7 of 25,

Sr. no. 1)

Volume-II / Chapter-9, Mnadatory spares

3.1 / Group A / 1

20 of 106 Complete assembly of HPT blades(includes inner blade casing and bladedrotorincluding all internal in assembledcondition and fitted in outer casing alongwith Breach Nuts (if applicable)OrIf design is such that stationary blading isprovided in diaphragms then full set ofbladed diaphragms/Carriers and nozzle setrequired for all stationary stages of HPturbine, along with bladed HP rotor withapplicable fined gland seals, diaphragmpacking’s & outer casing if applicable i.e.complete HP Turbine assembly.

Bidder understand that only 1 No. HPbladed Rotor has to be supplied.However specification includes innercasing & outer casing as well. In view ofabove, SJVUN is requested to clarifywhether: (a) 1 No. bladed Rotor has to besuppliedOR,(b) Complete HP turbine (includinginner & outer casing) has tobe supplied.

Inner & outer casing of HPT is not required. Only Rotorcomplete assembly shall be supplied.

2 Clarification - 3(Page 1 of 3,

Sr. no. 2)

Volume-II / Chapter-9, Mnadatory spares

3.1 / Group A / 2

20 of 106 Complete assembly of IPT blades(includes inner blade casing and bladedrotor including all internal in assembledcondition along with full set of both endsof stationary gland seal segments(Finned) OrIf design is such that stationary blading isprovided in diaphragms then full set ofbladed diaphragms/Carriers and nozzle setrequired for all stages of IP turbine, and 1assembled IP rotor with applicable finedgland seals, Diaphragm Packings

Bidder understands that bidder has tooffer 1 no. complete assembly of IPTurbine without Outer casing instead ofIPT blades.Customer to confirm.

Confirmed

As per prebid clarification 7, Only HP Rotor complete assembly shall be supplied & Inner & Outer casing of HPT is not required to be supplied against the referred tender clause.

In the simillar lines bidder understands that for IP Turbine only IP Rotor complete assembly shall be supplied & Inner casing, diaphragms, stationary blading of IPT is not required to be supplied against the referred tender clause.

Kindly confirm.

Confirmed.K. Turbine

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Sl.No.

Amendment/ clarification

ref.Part Sub Section Clause

No page Specification Deviation/Clarification Owner's Response Bidder's query Owner's Reply/Clarification

VOLUME IIGeneral &Schedules

Ch 8 :FunctionalGuarantee&LiquidatedDamages

3.6 14 of 78 SPECIFIC AND LIMITING REQUIREMENTS FOR STEAM GENERATOR EFFICIENCY The guaranteed efficiency quoted by the Bidder shall comply withfollowing limiting parameters with design coal firing :c. Unburnt fuel at all efficiency load................................. 1.0 % (min) at 105% & 100% TMCR load

VOLUME IIIMechanicalWorks

Ch 1: SG&AuxiliariesSection 2 :DesignBasis ofSG &Auxiliariesand SCR

2.1.7.1 4 of 120 The Steam Generator design shall comply with the following limiting parameters with 'design coal' firing, under stipulated ambient air condition i.e. 27 degree Celsius temperature and 60%relative humidity (iii) Lo ss due to unburnt carbon in ash at all .......................1% (minimum) or the quoted loads value whichever is higher.



3.7 14 of 78 MAJOR REQUIREMNTS/ METHOD OF STEAM GENERATOR EFFICIENCY TESTSd) Ambient air conditon : 27 degree Celsiustemperature (Dry bulb) and 60% relative humidity. The reference air temperature for the Steam Generator efficiency guarantee/ testing shall be taken asthe temperature of air (i.e. 27 degree Celsius) entering APH.

Bidder understands that for the guaranteed boiler efficicnecy calculation, reference temperature shall be taken as 27 deg C instead of 25 deg C (as specified in ASME PTC 4). Hence the Clause to be read as follows:.d) Ambient air conditon 27 degree Celsius temperature (Dry bulb) and 60% relative humidity. The reference air temperature for the Steam Generator efficiency guarantee/ testing shall be taken as the temperature of air (i.e. 27 degree Celsius) entering APH. insteadof Actual Air Temperature Entering APH

Reference temperature is 27 Deg C. The air temperature at inlet of Fans instead of APH shall be taken as 27 Deg C. Therefore the Clause to be read as below: ".d) Ambient air conditon 27 degree Celsius temperature(Dry bulb) and 60% relative humidity. The reference temperature for the Steam Generator efficiency guarantee/testing shall be taken as the 27 degree Celsius at inlet of Fans instead of APH".



3.7 15 of 78 MAJOR REQUIREMNTS/ METHOD OF STEAM GENERATOR EFFICIENCY TESTSf) Measurement and computation of heatlosses: As Per ASME PTC 4.

Bidder shall measure and calculated all the losses in accordance with ASME PTC 4 (with reference temperature as 27 deg C) without any heat credits as specified in point (g) of this clause of tender specification. Further, bidder shall use ABMA curve per PTC 4.1 for computation of surface radiation and convection losses.

Your understanding is correct

3 Amendment-17Vol-IVol-III

Attachment-6(P)Ch 1: SG &AuxiliariesSection 2 : DesignBasis ofSG & Auxiliaries andSCR

x, (e)2.10.5.14

39 of 120 e) Ceramic material wherever provided (hours of Operation): Asper clause 2.10.5.14 , Sec. 02, Ch. 01Vol III.Minimum Guaranteed Life of Coal Pulverizer Wear Parts

The requirement mentioned in clause "x, (e)" of attachment -6(P) is notspecified in cl. no. 2.10.5.14 of Vol-III, hence, Owner is requested todelete this from Attachment-6(P).The commented Attachment- 6(P) with suggested changes as per ourunderstanding is enclosed as Annexure-2 for your ready reference.

ANNEXURE- I to Amendment 17

ATTACHMENT-6(P)-Rev- 01

The requirement mentioned in clause "x, (e)" of attachment -6(P)Rev- 01 is not specified in cl. no. 2.10.5.14 of Vol-III, hence, Owner is requested todelete this from Attachment-6(P) Rev- 01

If as per bidder's design, ceramic lining is not applicable, the same may be written in Attachment- 6(P) Rev-01.

Provision as per bidding specification shall prevail.

As per Sl.No. 8 and also as specified in vol-II, Cl.No.3.7, g), SJVN/DESEIN confirms that efficiency calculation shall be as per ASME PTC4.0, without heat credit.(i) For efficiency calculation as per ASME PTC 4.0, boundary condition starts from inlet of APH (Refer Fig.1-4-4 of ASME PTC 4.0). Hence considering air temperature at fan inlet is not valid and the air temperature of 27°C shall be considered at APH inlet.(ii) As per ASME PTC 4.0, 5-13.1 Reference temperature of 25°C is used as a datum temperature. Bidder request to keep the reference temperature as per ASME PTC 4.0 (25°C) inorder to avoid any different interpretation among all the bidders. SJVN/DESEIN to confirm the same.

1L. SG & Auxiliaries

Bidder to consider Heat loss due to unburned carbon as 1% min or as predicted by bidder, whichever is higher.

2

Clarification-16 Sr. no. 6Page 13 of 34

Clarification-16 Sr. no. 7& 8 of 34

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We understand that for efficiency calculation, Clause 2.1.7.1.iii) is to befollowed for calculating the Guaranteed Boiler efficiency. Therfore clause 3.6 to be amended as below:The guaranteed efficiency quoted by the Bidder shall comply with following limiting parameters with design coal firing :c. Unburnt fuel Carbon in Ash at all efficiency load................................. 1.0 % (min) at 105% & 100% TMCR load Bidderunderstanding is inline with ASME PTC 4, Section 5, sub section 5-14.4.1 for UBC Loss.

Bidder understanding is correct. Bidder understand that Heat loss due to Unburnt carbon in ash shall be consdiered 1.0% (Min) or bidder predicted value whichever is higher. This is the requirement being specified in NTPC Tenders.

Further bidder would like to highlight that Unburnt carbon in ash and Heat loss due to unburnt carbon in ash carries different meaning.

SJVN/DESEIN to confirm the heat loss due to unburnt carbon in ash to be considered to bring all bidders at par.

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4 Clarification-13Sr. No. 3 Page 5 of 37

Vol-II 2.1 (C) (2) Ch 9 : MandatorySpares

5 of 106 LOW TEMPERATURE SUPER HEATER(LTSH) Bends: 20 Nos. (LOT) of each size,type, thickness, radius and material. 40 No'ssupply tubes, bends/offset.

Bidder has considered 20 Nos. of tube bend ofeach size, type, thickness, radius and materialonly.SJVN/DESEIN has to clarify the requirement of"40 No's supply tubes, bends/offset."

Clarification reference: CLARIFICATION 13

Please comply with specificationrequirement.

Bidder has considered 20 Nos. of tube bend of each size, type, thickness, radius and material only.SJVN/DESEIN has to clarify the requirement of"40 No's supply tubes, bends/offset."

"40 No's supply tubes, bends/offset" requirement stands deleted.

Amendment No. - 17

Vol-II ATTACHMENT–8-Rev-01

II,(ii) 2 of 13 NOx emission at SCR inlet as per clause 5.40 (ii), Ch-8, Book 1 of 2, Vol-II………………... mg/Nm3

Addendum-04 Vol-II ANNEXURE-I 5.40, (ii) 2 of 155 - - GUARANTEES UNDER CATEGORY-IIINOx Emissions at SCR OutletContractor shall demonstrate that over entire range of steam generator operation from 40% to 100% TMCR load and for whole range of specified coal(s), the total NOx (from thermal as well as fuel) at the inlet of SCR shall not exceed 100 mg/Nm3 at 6% oxygen (O2) content in flue gas on dry gas basis .

6 Amendment No. 17

SCHEDULE-10-Rev-01

2 1 of 4 - - 2. Unit rate (per thermocouple-Supply and Installation) for addition/deletion of thermocouple (for both chromal-Alumel & Acromat thermocouple) for variation from the base quantity specified in clause 2.7.6 vide Addendum No.- , datedofVol III

We understand that the reference in this clause needs to be corrected as indicated below:"Supply and Installation) for addition/deletion of thermocouple (for both chromal-Alumel & Acromat thermocouple) for variation from the base quantity specified in clause 2.7.6 vide Addendum No.- 4, Amendment No. 17.Please confirm.

Confirmed. Refer Amendement - 20

7 Clarification-16Sr. no. 15Page 17 of 34

Volume IIIMechanicalWorks

Ch 1: SG& Auxiliaries

Section 2 :Design BasisofSG &Auxiliariesand SCR

Clause no. 2.9.1.

29 of 120 v) Air preheater Construction shall conform to following: 2. Heating Elements a) Cold end tier of elements shall be designed deep enough to encapsulate any Ammonium Bisulphate (ABS) and acid condensationfouling within the cold end tier. Made of vitreous enameled steel with minimum 1.0 mm thick base and additional 0.15 mm enamel thickness on each side.

As per Clarification No 04 dated 29.10.2018, Pg No 9 of 109, SL No32,, Customer had replied the provision as perbidding specification shall prevail. Also in Clarification No Clarification 2, Page 25 of 248, the same has been agreed as vitreous enamelled steel with minimum 0.75 mm thick base and additional 0.15 mm enamelthickness on each side.

Bidder would like to inform that Airpreheater is suitably selected into two Zones, Hot End and Cold End. Bidder proposeds to use Corten Steel for Cold End with 0.75 mm thkand additional 0.15 enamel thickness on each side. instead of Viterous Enammeld Steel.Corten Steel shall be sufficient coinsidering the low Sulfur Content in Indian Coal, thereforeminimising the formation of ABS. Also Steam Soot Blowers are provided suitably in the Cold ENd ZOne for effective cleaning as well as High Pressure Wash Washing Syetem isenvisaged for proper Offline CLeaning of APH Baskets during shutdown.

References: Attached Refrence from NTPC Talcher Amendment No 4on Page no14 of 19 , where Enamelling has has been removed.

Enamiling of APH elements orcorten steel with minimum 1.0mm thickness for hot end 1.2 mmthickness for cold end shall beconsidered

Bidder proposal for the selection of RAPH material is as follows:Hot/Intermediate end: Mild steel with 0.8mm thick.Cold end:Corten steel with 1.2mm thick.

NTPC/State utility specification doesn’t call for use of corten steel at RAPH Hot end elements, hence bidder request SJVN to remove this requirement. Refer attached reference from NTPC Talcher. (Please refer enclosed Annexure-1)

Material for heating element shall be as follows :Cold end: vitreous enameled steel with minimum 1.0 mm thick base and additional 0.15 mm enamel thickness on each side or corten steel with minimum 1.2 mm thickness.

Hot End: Carbon Steel with minimum 0.8 mm thickness.

There is a contradiction between the Amendment No.17 & Addendum-04 provided by SJVN/DESEIN with respect to Nox emission Guarantee. Bidder understand that NOx at SCR outlet is to be maintained as 100 mg/Nm3.SJVN/DESEIN to revise the gauarantee schedule provided in the attachment-8-Rev01 & Addendum-04.

Refer Amendement- 20 5

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

1.1.15.13 19 of 47 Adjustable valve/orifice of erosion esistant/ceramic coated material suitable for highly abrasive pulverised coal applications. The adjustable valve/orifice shall be provided on each PF pipe at pulverizer outlets and shall enable on load adjustment of coal flow in PF pipelines.

On-line adjustment for equalizing the flow through the coal pipes is not feasible as reliable adjustable orifices are not available. Accordingly, fixed ceramic-coated orifices are provided. The fixed orifices are selected to achieve the equalization in the fuel pipes based on design stage calculation. Since on-line adjustment for equalizing the fuel flow through pulverized coalpipes is not possible, on-line flow measurement does not provide any improvement. The reliability and capability of the 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.

The provision as per bidding specification shallprevail.

Adjustable orifice is supplied along with online fuel flow measurement. since online fuel flow measurement clause is deleted as agreed in the "Amendment-08, Sl.No.4" bidder persumes that the deletion is also applicble for adjustable orifice. Hence bidder shall consider fixed orifice in place of adjustable orifice.SJVN/DESEIN to confirm the same.

Confirmed.

Vol-III Section 1 : Scope/Ch 1: SG & Auxiliaries

1.13.7.1 44 of 47 vii) CFD and Physical modeling a) Contractor’s scope shall include ComputationFluid Dynamics (CFD) and Physical modelling for SCR reactor,

Vol-III Section 2 : Design Basis of SG & Auxiliaries and SCR/Ch 1: SG & Auxiliaries/

2.21.6 97 of 120 CFD and Physical Flow ModelingCFD modelling as well as physical modelling for SCR reactor, upstream duct work from economizer outlet (including economizer bypass) along with cyclone separator and downstream ductwork from SCR reactor outlet upto Air preheater inlet shall be carried out to examine and finalize the design options for the duct system, flow modification devices, Ammonia Injection Grid (AIG), etc. Modeling shall be carried out with the following objectives:


Vol-III Section 2 : Design Basis of SG & Auxiliaries and SCR/Ch 1: SG & Auxiliaries/

2.1.11 6 of 120 Operation without High Pressure (HP) Heaters in serviceSteam generator shall be capable of operation with HP heaters out of operation. The steam generator heat output under HP heaters out condition shall be at least 100% BMCR heat duty. Steam generator shall also capable of sustained operation with HP heaters out of operation so as to generate at least rated power output by the unit.

Kindly note that the operation with all HP heater out condition, the heat output may be limited to 100%TMCR heat duty instead of 100% BMCR heat duty.

The heat output shall meet 100% BMCR .The provision as per bidding specification shall prevai

The steam generator heat output under HP heaters out condition shall not be less than heat duty required for generating rated power output or design BMCR heat duty, whichever is lower. Kindly confirm.

In NTPC Talcher where SG heat output under HP heaters out condition shall not be less than heat duty required for generating rated power output or design BMCR heat duty, whichever is lower. Please refer enclosed Annexure-2.

Boiler heat duty during HP HTR out operation shall be same as of Boiler heat duty during 100 % BMCR (Design).


Vol-III Section 2 : Design Basis of SG & Auxiliaries and SCR/Ch 1: SG & Auxiliaries

2.21.23, B)

117 of 120 In addition to above in guarantee test NOx emission level at SCR outlet corresponding to inlet level of NOx i.e. 500mg/Nm3 ( to be achieved by adjustment of air staging) shall also be demonstrated.

Actual NOx predicted by the bidder at SCR inlet shall be considered instead of 500mg/Nm3.

The provision as per bidding specification shall prevail.

NOx generation depends on the fuel nitrogen & boiler design, hence demonstration of 500mg/Nm3 Nox at the inlet of SCR is not possible.Bidder request SJVN to waive off this requirement.

Refer Amendement-20.

12 Amendment No. 17

SCHEDULE-8A & 8B -Rev-01

19 - (I) Sch 8A: Performance Test on actual fan of the size & type offered of following fans at shop (refer clause 2.20, Ch.1 Sec. 2, Vol III, Section-VI)Sch 8B: Performance Test on actual fan of the size & type offered of following fans at shop (refer clause 2.10.8 Vol III)

We understand that the reference clause mentioned for both items shall be same. Request you to kindly confirm the correct clause no.

Sch 8B : Performance Test on actual fan of the size & type offered of following fans at shop (refer clause 2.20 Ch.2 Sec 2 Volume III)

The provision as per bidding specification shallprevail.

Based on bidder experience and proven practice the requirement for physical model test is not envisaged. Therefore, bidder request confirmation to carry out CFD analysis only


Clarification-2Sr. no. 39Page 17 of 248

9 Based on bidder experience and proven practice the requirement for physical model test is not envisaged. Therefore, bidder request confirmation to carry out CFD analysis only

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1 Addendum 4 Annexure I (GUARANTEES UNDER CATEGORY-III)

5.41 (i) (i) Wet ball Mill capacity at rated finenessThe contractor shall demonstrate the guaranteed capacity of each limestone pulverizer under the following conditions:i) Limestone fineness: 90% or higher (as per therequirement of the absorber) through 325 mesh.ii) Limestone Quality: All available quality fromthe specifiedrange.

Bidder requests to modify the clause in line with tender requirement as specified in Clause 6.6.5 Wet Ball Mill of 'Volume III : Mechanical Works' (Ch 6 : Flue Gas Desulphurisation System, Sheet 30 of 54) to incorporate requirement for Jet Bubbling Process as below.

"Output Fineness 90% or higher (as per the requirement of the absorber) through 325 mesh (for spray tower process) OR 90% or higher (as per the requirement of the absorber) through 200 mesh (for jet bubbling process). "

Confirmed

2 Addendum 4 Annexure I (GUARANTEES UNDER CATEGORY-III)

5.41 (iv) (iv) Pressure Drop across FGDThe contractor shall demonstrate that the total pressure drop in the gas path across the FGD System shall not exceed the guaranteed values for the range of coal and loads specified in the Technical Specification.

Auxiliary Power Consumption (APC) of the FGD system is a function of 'Pressure Drop across FGD' system. This APC shall be quoted by the bidders as part of Unit & Station Auxiliary Power Consumption in the Bids. The additional demonstration of Pressure Drop across FGD system at various loads is not envisaged. The same is not a part of guarantees in any ongoing tender or ordered FGD tender by any prominent power utility in India including NTPC.

Hence, Bidder requests for deletion of this clause.


Addendum 4 Attachment 3K

7.0.0 80 of 149 ………………………………………….….(QFGDM) and above subsidiaries].

Deed of Joint Undertaking as per format enclosed at Annexure…………

We further confirm that notwithstanding……

Addendum 4 Attachment 3K

5.0.0 10 of 149 iii) inorder to meet the requirement of clause4.21.2© oc CH-04, Vol-II we further declare the following:

We are enclosing Deed of Joint Undertaking(DJU) executed between us, our subvendor (if applicable) and the QSCRM, as per clause 4.21.2© of the chapter -04, Vol-II......for SCR System.


The 3K format specifies DJU submission for FGD/SCR along with the bid submission. Kindly modify the text in line with requirement specified in the Clause 4.22 Note A) 4 ii) (sheet 19 of 40) and Clause 4.23 of Ch 4 : Provenness (Sheet 20 of40) of Volume II - General & Schedules.

"The Deed of Joint Undertaking (DJU) shall be submitted prior to the placement of order on the approved sub vendor."

3

M. ESP & FGD

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Annexure - IIII (Rev 01) of Amendment - 16

Note - The sketch plan is exclusively meant for and should be read for indicative areas with different formation levels.

- Volume VI Chapter 2 2.8.1 8 of 11 A RCC retaining wall shall be provided at the junction of different grade levels with provision of stepped stair cases/ramps at different grade level locations for easy movement of persons, etc.

Section-VII Note no.1 of

PRICE SCHDULE 1, 2 & 4

2 of 5 of (schedule-1)2 of 4 of schedule-22 of 5 of (schedule-4)

Steel structures associated with TG building, Bunker building (if not integrated with boiler structures) Transfer points, Conveyor galleries, pipe and cable trestle, Auxiliary buildings etc. to be considered under factory fabricated steel structures (at Sl. No. (A) 2 above) and bidder to accordingly price & include the cost of same under Schedule 1 & 2 applicable for supply and Schedule 4 for erection.

Volume VI Chapter 9 9.2 2 of 23 Welding shall be used for fabrication and erection. Site connections shall generally be with welding.

Volume VI Chapter 11 Clause No.11.1.6

Fabrication YardClarification No. 6, Sr No. 1, H - Site SpecificBidder's Query:As per prevailing practice , all steel structures including PHStructures , Coal bunker, Chimney flue liner etc shall befabricated at site only to meet completion schedule matchedwith erection programme . Therefore customer to give necessary area for site fabrication yard from plant lay downarea for the same. However necessary T&Ps as required for above shall be deployed by Bidder / its sub contractorsto meet the project schedule Please confirmOwner's Response:The area available for the Project is already shown in the Plot Plan. Addl. Land if required by the bidder shallbe arranged by him.

- Site fabrication of steel structure is allowed as per technical specification clause no 9.2, Volume VI, Chapter 11. However, as per note no.1 of price schedule 1, 2 & 4, factory fabrication has been stated. Hence, we request Owner to clarify and amend the note as per the following:

"Steel structures associated with TG building, Bunker building (if not integrated with boiler structures) Transfer points, Conveyor galleries, pipe and cable trestle, Auxiliary buildings etc. to be if considered under factory fabricated steel structures (at Sl. No. (A) 2 above), and bidder to accordingly price & include the cost of same under Schedule 1 & 2 applicable for supply and Schedule 4 for erection".This amendment will provide the necessary clarity to bidders.

1

N. Civil

As the difference between the formation level is only 1 m, Bidder shall consider earthen bund with appropriate slope protection instead of RCC retaining wall for grade transition purpose.Owner to please confirm.

2


However, Grade level junction between plant area & area earmarked for 3rd unit expansion (+64.00 M level marked as Area 'A') and Railway Bulb area & CHP Area (+63.00 M level marked as Area 'B') shall be matched with appropriate slope and suitable slope protection measure.

Incorrect Technical Specification reference clause quoted in the query. No such clause exist in the Chapter 11. Fabrication of the Steel Structures shall be carried out as defined in Note No.-1 of Price Schedules No. 1,2 & 4.Regarding Para-2 of the query, bid provisions shall prevail.

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3 Amendment No. 16, Sr No. 2, Sheet 2 of 2

VI Clause 2.8.1Plantlevelling &GradingFirst 7 linesof 2nd Para

8 of 11 The formation level of the area earmarked for CHP, railway Infrastructure Bulb Area, Coal Handling Plant. Stock Pile area etc. (i.e. entire area lying between main plant area and AshPond area) shall be kept at +63 m as marked “B” in Attached Plot Plan (Annexure-I). The formation level of all the roads except Ash Pond Area shall be kept at +64 m. Road level of the plant is to be kept +0.25 m to +0.3 m above formation level and finished floor level of all buildings is to be kept +0.5 m above formation level in the respective portions.

Bidder would like to keep the formation level of all roads and drains within the area marked as "B" at 250 mm above +63 m, in order to avoid local flooding within stockpile area and associated structures in CHP area. Owner to please confirm.

Refer Amendment-20

4 Annexure - III (Rev 01) of Amendment - 16

Note:2. Though the formation level of CHP/Rail InfraBulb Area (marked as "Area- B") is +63 m level, the rail track and hopper/tippler should be designed and constructed considering formation level of +64 m.

3. The construction of Rail Infrastructure / RailTrack / Filling above +63.00 m level is not in the scope of the EPC bidder and shall be carried out separately by Owner.

As the design and construction of of Wagon tippler and Track hopper to be done considering formation level of +64 m, We understand that additional filling above +63 m in the wagon tippler and track hopper area shall not be in Bidder's scope. Please confirm.

Design & construction of Wagon Tippler and Track Hopper is to be done by the Bidder considering formation level of +64.00 M. The construction of plinth protection of Wagon Tipper & Track Hopper area shall be in bidder's scope. Therefore, the backfilling as required for construction of plinth protection for Wagon Tippler & Track Hopper shall also be in bidder's scope.

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The ESP is already designed considering 30 mg/Nm3 with one field out of service. Hence, one extra field is already available. Also, please note the tender condition specifying min. 90% of ash at D.P. & min. 85% of ash at G.P. carried over to ESP is already on the higher side considering values observed in power plants. Hence, bidder envisages that offered ESP shall meet the performance requirement as per tender and no additional field shall be required.

Further, all power plant equipment are designed as per coal specified by Owner and the design criteria specified in the tender documents. If Owner is envisaging a change in coal quality in future, the coal analysis need to be suitably revised at this stage, so that all equipment will be designed for the same. Keeping space provision only for additional ESP field will not mitigate the effect of change in coal quality on the entire plant.

Bidder further clarifies that sufficient margin is already available in plant design to limit PM emission well below 30 mg/Nm3 at stack outlet specified in latest MOEF guideline.In view of the above, Space provision for installation of additional field of ESP is not required for the coal analysis provided in the tender. Owner is requested to revise coal analysis if a change in coal quality is expected.

Refer Amendement- 20.Space provision is required in case the contractor is not meeting the tender requirement during the Performance testing, he shall add additional field.

Also the coal quality changes in future, the additional field may be required.

O. General

Bidder would like to draw Owner's kind attention towards Clause 33.1.2/J, Ch-33, Volume-III (Page 3), where it is specified under layout requirement that Space provision shall be kept for installation of additional field of ESP. Further the ESP specification stipulates that the: • ESP is to be designed for BMCR, worst coalcondition to limit PM (Particulate Matter) to <30 mg/Nm3 with one field in each pass of ESP out of service.• With all fields in service, Bidder must guaranteePM <17 mg/Nm3 at TMCR condition. The technical specifications for ESP (Ch-1, Sec-3 of Vol-III) however does not specify any requirement of space provision for additional ESP field.Additionally, the FGD installed at the downstream of ESP will also reduce PM and sufficient margin is already available in plant design to limit PM emission well below 30 mg/Nm3 at stack outlet specified in latest MOEF guideline. Space provision for installation of additional field of ESP is not required. This also in line with the practice followed in all recent NTPC tenders like Talcher and Patratu.Bidder therefore would request an amendment deleting this requirement, as the stated provision does not serve any purpose other than increasing the project cost.

Space provision shall be kept for installation of additional field of ESP.

1 Vol. III Ch 33 33.1.2/J 3Clarification-16 Sr. no. 4

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Addendum-04Sr. no. 1Page 1 of 7

Vol –II

Ch-1 4.2 9 of 12 4.2The contractor's scope shall include all precommissioning and commissioning activities,materials and services as detailed in other portion of technical specifications includingsupply of all consumables (except coal and fuel oil for firing), temporary equipment and piping,instruments, labour/skilled manpower's etc. The scope includes complete requirement of flushing oils including fresh oil refilling during the precommissioning and commissioning activities and subsequent initial operation.

- 4.2The contractor's scope shall include all pre-commissioning and commissioningactivities, materials and services as detailed in other portion of technical specifications including supply of all consumables (except coal), temporary equipment and piping, instruments, labour/skilled manpower's etc. The scope includes complete requirement of flushing oils including fresh oil refilling duringthe pre-commissioning and commissioning activities and subsequent initial operation.Fuel Oil for firing up to successful completion of “Initial Operation” (asdefined in General Technical Requirements, Volume II, Chapter 5 of Technical Specification) of the units shall be supplied by the contractor.

Clarification-6Sr. no. 5Page 19 of 22

Vol-II Chapter 6 ECC, clause no27.00

Facilities to be providedby Employer

i) free Supply of Fuel Oil & coal till handover ofunit is in scope of customer.

OK

Amendment-9ANNEXURE-IIATTACHMENT-14 (Revision-01)

Refer Amendment-202 There is a contradiction between the referred Clarifications/Amendments received from Owner. As per Amendment-4 & Clarification-7, Fuel oil supply till completion of trial run operation is in Bidder's scope. However, as per Clarification-6 & Amendment-9, the same is in Owner's scope.

Bidder once again propose that the scope of supply of fuel oil till sucessful completion of Initial Operation be kept in line with NTPC Talcher Project, where 18,640 KL LDO is provided by Owner to Contractor free of cost.Any excess requirement for above purpose beyond this quantity is also supplied by Owner but charged back to Contractor. This clause is equitable and fair and takes care of the interest of the owner. (Please refer enlcosed Annexure-3). Owner to note that he gets reimbursed for power generated during trial operations based on rates applicable for "Infirm Power" and further recovering cost of LDO from contractor is not justifiable.

Owner is requested to please confirm acceptance of our proposal and correct the discrepancy highlighted above.

With reference to Pre-bid Clarifications received from STPL on 29.10.2018, wefind that following major inputs are pendig from STPL:*Revised Coal Analysis*Study Report by M/s Rodic Consultant Private Ltdfor Nulla DiversionWe would like to bring to your kind notice that we are not able to start ourproposal enginering activities in the absense of these vital inputs. We requestSTPL to provide the above two inputs on Priority.Further, we have noted that clause no. 4.2, (page 9 of 12) of Vol-II Chapter-I hasbeen amended to incllude the supply of fuel oil till completion of Initial operationin Contractor's Scope. We propose that the scope of supply of fuel oil tillsucessful completion of Initial Operation be kept in line with NTPC TalcherProject, where 18,640 KL LDO is provised by Owner to Contractor free of cost.Any excess requirement for above purpose beyond this quantity is also suppliedby Owner but charged back to Contractor. This clause is equitable and fair andtakes care of the interest of the owner

For Revised Coal Anaysis, please refer Sr. No. 1 of Amendment-06 For Study report by M/s Rodic

Consultant Private Ltd. For Nulla Diversion, Please refer Sr. 1 of Addendum-02

Regarding scope of supply of fuel oil, bid provision as per Sr. No. 1 of Amendment- 4

shall prevail.

9 of 124.2Chapter-1VOL-II, Clarification-7S

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3 Amendment-17SCHEDULE-10-Rev-01

Sr.No.4 2 of 3 Unit rate for increase/decrease in Aux. PRDS capacity in T/hr.with respect to base capacity specified at clause 1.1.10, Vol.-III, Ch-01, sec- 2

The referred Clause is not available in Vol.- III, Ch-01, sec- 2.

As per bidder's understanding the correct clause should be clause no. 1.1.10, Vol.-III, Ch-01, sec- 1.

Bidders understanding is correct

4 Ch.2 : Steam Turbineand its AuxiliariesSection-1: Scope of Works

Ch 10 : Hotwell Makeup &Boiler/ Deaerator Fill System

1.2.2.3

10.2

6 of 12

2 of 6

Make up System:Condensate storage tank (capacity of the CST shall be 2x1000 m3) and from the condensate storage tank the DM water will be provided to the following via 3 x 100 %(2W +1S) hot well make-up pump.

Scope of Supply:Two (2) (1W+1S) Hotwell Make-up Pumps installed at outlet of each Condensate Storage tank for each Unit.

There is discrepancy observed in referred clauses for the nos of hot well make up pumps.

Bidder understands that there should be 3 nos (2 working +1 common standby) of normal hot well make up pumps in line with NTPC projects. (Please refer NTPC Talcher Specification).

Please confirm acceptance on bidder's understanding.

3 x 100 %(1 Working per unit +1 common standby) hot well make-up pumps shall be supplied.

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