Date-02/02/2019Steam Turbine and its Auxiliaries 52 of 70 7.2 Prebid Clarifications - 4 S. no. 65 Emergency point Two turbine driven feed pumps to be capable of generating the discharge

Sl. No.

Amendment / clarification reference

Volume No. Section/ Chapter No.

Description as per tender document

Bidder's Query Owner's Response Bidder's Query

1 Prebid Clarification No. 13, Sr. No. 1, Page 1 of 14

Pre BidClarification10

SL no. 3 / Page 2 of 26

The number of mills shall be minimum 8 and the same may be arranged in the front or in sides or in rear.

Request customer to furnish the following details regarding Travelling tripper arrangement for rear/Front mill arrangement:1. No. of trippers to be considered each bunker bay.2. No. of pent legs for each tripper to be considered.3. Whether the last bunker will be filled through travelling tripper or head discharge pulley of the conveyor.

1. For Front line Mills 2 no. tripper on each conveyor with anti-collision devise and for side-Mill Arrangement Each side 2 conveyor with 1 No. of tripper on each conveyor.

2. As per bidder's design.

3. Last Bunker fed through travelling tripper, provision is to be kept so that in case of tripper breakdown last bunker can be fed through conveyor directly.

1. Noted. As per industry practice (in recent projects of NTPC/SEBs), in case of Front/Rear mill, Travelling Tripper willbe unitized and hence will not be travelling from Unit-I to Unit-II and vice versa.

2. Noted.

3. It is not possible to feed the last bunker of last unit through both travelling tripper and head discharge of the conveyor. Industry practice (in all recent projects of NTPC/NLC/SEBs) is to feed the last bunker of last unit directly through head discharge of the conveyor and not through the travelling tripper.

Please refer Annexure-1 for Flow Diagram/Conveyor Profile of NTPC Talcher and NLC Ghatampur Projects .

In view of above, bidder requests that the last bunker be fed directly through head discharge of the conveyor only.

Owner is requested to confirm their acceptance against point (1) and (3) above.

Confirmed for point 1 and 3.

Owner's Reply

A. CHP - MECHANICAL

EPC PACKAGEFOR

BUXAR THERMAL POWER PROJECT (2X660 MW)

PREBID CLARIFICATION-16

Date-02/02/2019

Page 1 of 34

Sl. No.

Volume No. Section/ Chapter No. Clause no.

Description as per tender document Bidder's Query Owner's Reply

1 Pre Bid Clarification 13

SL no. 1 (CHP - MECHANICAL) /Page 1 of 37

A 3. Last Bunker fed through travelling tripper,provision is to be kept so that in case of tripperbreakdown last bunker can be fed through conveyor diectly

a. Last bunker of last unit will be fed by head pulley of the common bunker conveyor in rear / front mill option.b. Last bunker of first unit will be fed by tripper, in rear / front mill option.c. It is not possible to provide both options for last bunker of last unit i.e. a) Feeding by Tripper and b) also by head pulley of bunker conveyor.d. Traveling Trippers of first unit will not travel to second unit and vice versa. And traveling trippers shall be unitised.Request customer to confirm.

Confirmed.


SL no. 1 (CHP - MECHANICAL) /Page 1 of 37

A 1. For Front line Mills 2 no. tripper on eachconveyor with anti-collision devise and for side-Mill Arrangement Each side 2 conveyor with 1No. of tripper on each conveyor.

In case of side mill arrangement bidder proposes to provide single stream of conveyor with 1 no. travelling tripper having 3-way discharge chute, as envisaged in the tender specification.

Request customer to confirm.

Confirmed.

B. CHP - MECHANICAL

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Date-02/02/2019

Page 2 of 34

Sl. No.

Volume No. Section/ Chapter No. Clause no.

Description as per tender document Bidder's Query Owner's Reply

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SL no. 3 (LHP & GHP - MECHANICAL)/Page 4 of 37

C EOT crane for the buildings is required.

For LHP and GHP transfer tower/ junction house and storage silo building, BHEL proposes only Hoist for maintenance of equipment inline with CHP. So, EOT is not envisaged in LHP and GHP transfer towers/ junction houses/storage silo building.

Request customer to confirm.

Confirmed.

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.

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.

Confirmed.

C. Mechanical Work

Date-02/02/2019

Page 3 of 34

Vol Ch/Sec. Title page Clause

1 Volume III Ch. 2Section 2

Steam Turbine and its

Auxiliaries

52 of 70 7.2 Prebid Clarifications - 4S. no. 65

Emergency point Two turbine driven feed pumps to be capable of generating the discharge pressure not less than 3% over steam generator highest safety valve set pressure corresponding to 105% ofBMCR flow.

Emergency point Two 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.

The Provision as per bidding specification shall prevail.

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.

The provision as per bidding specification shall prevail.

Bidder again requests owner to accept the following as plant will never see 105% BMCR flow:

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.


2 Volume-III Chapter-2, Section -2

Steam Turbine and its

Auxiliaries

49 of 70(267 of 1106)

5.4 (xiii) WATER STEAM CYCLE / PROCESS & CALCULATIONS Sl. No.64

… 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 suction system 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


Bidder again requests owner to accept the following:

… bidder shall carryout the transient analysis of BFP suction system considering the following conditions:-iii) Deaerator at low level.


3 III Ch 18 Induced Draught

Cooling Tower

10 of 21

20 of 21

18.3.8b

3.03

Fill shall be of splash bars type and easily installable

Bidder shall furnish details of PVC/PP fill regarding fire retarding properties, ageing effect, vibration caused by water and wind effects. The fill material shall be highly resistant to deterioration and shall be fire retardant

Material of Construction: Splash grid - PVC/PP

Bidder understands that PVC/ PP splash bar/grid type of fills are acceptable in cooling tower.

Bidder to comply withstipulation of TechnicalSpecification.

Contradiction in clauses. Bidder understands that PVC/PP Splash fill isacceptable. Please confirm.

Confirmed Bidder understands that trickle grid or splash type V-bar splash type fills, as per proven design of OEM, are acceptable.

Confirmed.

4 Volume-IV Chapter 29

400kV Gas Insulated

Switchgear

62 of 71 29.41.02 f) Prebid Clarifications - 9

Sl. No. I11.

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.

We do not envisage carrying out any type test on 400kV GIS since repeatingtype tests are expensive, time consuming & involve difficult international logistics. Therefore we shall be submitting valid reports only for the subject type tests. Acceptance confirmation required from STPL.

-- -- Type test older than five (5) years shall not be valid from manufacturers qualified against S.No.5.16 of Ch.4 of Vol.II

Bidder 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 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.

The provision as per specification shall prevail.

EPC PACKAGEFOR



Final replies dated Owner's Response Revised Statement of Clarification sought Bid Specification StipulationSl.

No.

Enquiry Specificationrefernce sl no. (as per customer replies)

Owner's ReponseRevised Statement of Clarification sought Statement of Clarification sought

D.

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No.



5 Volume-II Chapter 4 Provenness 35 of 40 5.16 Prebid Clarifications - 7

Sl. No. B11

5.15.1 The Bidder/Sub vendor should have designed, manufactured,………5.15.2(a) The Bidder/Sub vendor should have designed……………5.15.3(a) The Bidder/Sub vendor should have designed…………..……..as a comprising of at least one circuit breaker, two disconnectors and single phase current transformers.

Please confirm if GIS OEMs, who have recently established GIS manufacturing facility in India , but are yet to commission GIS bays supplied from Indian Factory, can provide India factory made GIS for subject project , subject to their parent company / technical collaborator satisfying subject QR.

-- -- As per Clarification No. 7, Pg No. XX Sl. No. B11, client replied as:-Clause 5.15.2 (a) or 5.15.3 (a) of Volume II has to be mandatorily complied with.NOTE: ALL THE GIS BAYS SHALL BE MANUFACTURED IN INDIA ONLY.

6 Volume-IV Chapter 29

400kV Gas Insulated

Switchgear

62 of 71 29.41.02 i) Prebid Clarifications - 7

Sl. No. B12

Type Tests We understand that submission of valid reports of type tests conducted by parent company of GIS OEM having established GIS factory in India shall suffice. Please confirm.

-- -- Type test reports shall be valid only if the GIS has been manufactured in India.

----- ----- Bidder agrees to comply with Tender Specification requirements of Short Circuit Withstand Test mentioned at Vol-IV, Chapter-3, Sr No. 3.03.04 (Pg No. 6 of 42) which is as follows: "The thermal ability to withstand short circuit shall be demonstrated by Bidder by calculations. The dynamic ability to withstand short circuit shall be demonstrated (a) by tests or (b) by furnishing the test report of transformers supplied by the Bidder & detailed test calculation to prove dynamic short circuit withstand capability for the offered transformers."

In view of the above, Bidder does not envisage to fill-up the Short Circuit Test Charges against Schedule 8A & 8B.

The provision as per specification shall prevail.

All type tests on Generator Transformer shall be performed.

Bidder to submit filled up Schedule 8A/8B.

The requirement of this clause and subsequent clarifications are limiting the number of qualified vendors. This being a critical package, we request you to kindly delete the requirement of manufacturing & type testing in India.The above concept is also acceptable in central utilities like NTPC & Power Grid.

7 Volume-IV Chapter 3 Power Transformers

6 of 42 3.03.04 Prebid Clarifications - 3

Sl. No. N3

Short Circuit Withstand Test Customer has asked for Short Circuit test on Generator transformer. We request that Customer may please be asked to review their requirement and exclude this test because of following reasons:I) 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 3 to 4 months, therefore total delivery time should be extended by 3 to 4 months for performing short circuit test.II) BHEL has excellent record of short circuit testing for various rating of Power transformers. Recently, 260 MVA, 22/420/Ö3 kV, 1-phase Generator transformer was successfully short circuit tested at NHPTL, Bina for NTPC Tanda project. Our design and facilities has well proven for Short circuit testing. Moreover, we shall furnish calculation for thermal withstand capability for short circuit for transformer during detail engineering.

The provision as per bidding specification shall

prevail.

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No.



8 IV Chapter 3 Power Transformers

6 of 42 3.03.04 Prebid Clarifications - 4

Sl. No. U11

The thermal ability to withstand short circuit shall be demonstrated by Bidder by calculations. The dynamic ability to withstand short circuit shall be demonstrated (a) by tests or (b) by furnishing the test report of transformers supplied by the Bidder & detailed test calculation to prove dynamic short circuit withstand capability for the offered transformers.

Bidder will only submit calculation to prove the ability to withstand dynamic short circuit during detail engineering stage for GT. Short circuit test will not be performed physically on GT. Additionally test certificates for similar rated traformer shall be submitted during detailed engineering for customer approval.Please accept the same.

Type test to be done. ----- -----

9 Volume II chapter 19 Coal handling Plant

4 of 154 ,

71 of 154 ,

72 of 154

clause no. 1.7,11

clause no. 1.4

clause no. 2.8

Prebid Clarifications -2Sl. No. E1(59)

Travelling Tripper# TRT-1A/1B/ 2A/2B with three way dischargechute having flap gates.

One (1) linear actuator operated flap gate shall be provided todirect the material flow through the tripper’s two (2) way discharge chute to deliver coal either into Coal Bunker Slot opening or the tripper conveyor itself.

Type of discharge chute:Three-way with required flap gates having Linear actuator

Discrapancy observed in referred clauses for traveling tripper dischargechute.Owner is requested to clarify the same.

Last Bunker shall be fedby head pulley. Hencethree way chute requiredfor each tripper.

----- ----- For front mill arrangement, traveling tripper with two-way discharge are provided. Three way chute on tripper is not feasible/applicable for front mill arrangement where two streams of tripper conveyors are installed. This is inline with Jawaharpur project where M/s. Desein is the consultant and also in line with NTPC projects.

Also, in recent NTPC tenders also, it is mentioned that "In case of Front mill arrangement, the tripper shall have provision for dropping coal from conveyor onto one side of tripper to the bunker or back to the conveyor for the purpose of skipping intermediate bunkers."

Kindly confirm acceptance.

Confirmed.

10 V Part B/Ch 16: Plant Security

and Surveillance system

Camera Housing

10 of 17 16.06.00 - (iv Prebid Clarifications - 8

S. no. D1/13

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.

Bidder wants to clarify that for FOPH & Fuel oil tank area, Explosion proof cameras are considered.For CHP area, flameproof cameras are not envisaged. Further no OEM manufacture flame prooof cameras. In CHP area, PTZ dome type cameras are envisaged.

Bidder wants to clarify that for FOPH & Fuel oil tank area, Explosion proof cameras 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.

Not acceptable.

Please comply with specification. Reasonable No. of suppliers are available in the market.

Volume IIGeneral & Schedules

CHAPTER 9 :

MANDATORY

SPARES

Prebid Clarifications - 2

S. no.4Pg. 246 of 248

III. CONTROL & INSTRUMENTATION (MANDATORY SPARES) :Table Heading Quantities are per unit. In case of common system, quantities shall be doubled.

Bidder understanding is that the quantities mentioned here are for both the units.Kindly Confirm.

The Provision as perBidding specification shall prevail.

----- -----

Volume IIGeneral & Schedules

CHAPTER 9 :

MANDATORY

SPARES

1.2 (ii) Whenever the quantity is indicated as a percentage, it shall meanpercentage of total population of that item in the station (project)unless specified otherwise, and the fraction will be rounded off tothe next higher whole number.

----- ----- ----- -----

11 Refer Amendment-17.Both the cluases are contradictory.

Bidder understands that wherever % is mentioned it shall mean percentage of total population of that item in the station (project).

Date-02/02/2019

Page 6 of 34

Sl.No.

Vol. Chapter Clause No page Specification Bidder's Query Owner's Response

2 II Ch 8 : Functional

Guarantee &Liquidated Damages

3.10.1 (xxi) Sheet 14 of 78

Motor Driven Boiler Feed Pump(For this purpose only 15% of the deemed power consumed by the MDBFP at 100% TMCR unit load shall be considered).

For this purpose only 15% of the power consumed by the MDBFP and MDBP at 100%TMCR load as determined during shop test shall be considered.Please confirm acceptance.

Bidder understsnding is correct

E.

1

EPC PACKAGEFOR



While guaranteeing the auxiliary power consumption the bidder shallnecessarily include all continuously operating unit auxiliaries. The auxiliaries to be considered shall include but not be limited to the following:

(xxxv) Electrostatic Precipitator with all TR sets , all hopper heaters including wrap around heaters of adapters, if applicable & all insulator heaters/pent house fans (if applicable) of all ESP passes working and rapping system in normal operation. During the test all hopper heatersincluding wrap around heaters of adapters, if applicable & all insulatorheaters/pent house fans (if applicable)of all ESP passes will be in ONcondition and set point temperature shall be kept 5 degree Celsiusabove the flue gas temperature. (Refer Note 4 below).

Note-4:4. Method of Computation of Auxiliary Power consumption for ESP:-For guarantee purpose, total maximum continuous Auxiliary powerconsumption will be the power consumption of corona power (Excludingpower consumption by hopper heaters, insulator heaters, rappingsystem, ventilation fans etc.) of all fields of all passes of ESPs for oneunit. Corona power of TR sets will be computed at the input terminals ofthe TR sets when all ESP fields of all ESP passes are working and rapping system is in normal operation at the guarantee point condition as specified. The measurement for guaranteed auxiliary power consumption shall be carried out during ESP collection efficiency test. The method for computing the corona power shall be as described below:-.................

Note-4 is modified as below

Note-4:4. Method of Computation of Auxiliary Power consumption for ESP:-For guarantee purpose, total maximum continuous Auxiliary power consumption will be the power consumption of corona power (including power consumption by hopper heaters, insulator heaters, rapping system, ventilation fans etc.) of all fields of all passes of ESPs for one unit. Corona power of TR sets will be computed at the input terminals of the TR sets when all ESP fields of all ESP passes are working and rapping system is in normal operation at the guarantee point condition as specified. The measurement for guaranteed auxiliary power consumption shall be carried out during ESP collection efficiency test. The method for computing the corona power shall be as described below:-.................

The referred clauses are amiguous and hence require clarification from Owner to bring all bidders at par.

Bidder understands that, while guaranteeing auxiliary power consumption for ESP, only corona to be considered at 100%TMCR load with all fields in all passes are working as per referred Note-4.

Please confirm acceptance.

Sheet 22 of 78

3.10.1 Unit Auxiliary Power Consumption(xxxv)

Ch 8 : Functional Guarantee &Liquidated Damages

II

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3 ----- ----- ----- ----- Discrepency with Attachment-6(P) Please see comments in Attachment-6(P) enclosed with these queries.

Refer amendment 17.

4 ----- ----- ----- ----- Clauses not matching with Attachment-8 Please see comments in Attachment-8 enclosed with these queries.

Refer amendment 17.

5 II Ch 8 3.5 Applicable corrections

for Heat Rate, Output and Condenser Pressure

Sheet 13 of 78

However, correction on account of variation in Reheater spray quantities with respect to values used for the purpose of turbine cycle heat rate values shallbe permitted only to the extent that such variations are solely attributable to the change in coal properties with respect to those specified for the design coal.Bidders shall necessarily include the correction curves for variation in reheater spray quantities with coal properties in his bid proposal, failing which no corrections shall be permitted.

6 Volume II

General &

Schedule

s

Ch 8 2.1 General Requirements

Sr. No. 10 & 11

Sheet 2 of 78

The Performance test shall be carried out as per the agreed procedure. The PG test procedure including demonstration tests shall be submitted within 90 days of the date of Notification of Award and finalization of thePG test procedure shall be done within 180 days from the date of Notification of Award. After the conductance of Performance test, the contractor shall submit the test evaluation report of Performance test results to Employer promptly but not later than one month from the dateof conductance of Performance test. However, preliminary test reports shall be submitted to the Employer after completing each test run.

The P&G test procedures shall be submitted for equipments/ system & subsystem under Contractor's scope for all Guarantees under category I, II & III as mentioned below, as per latest International codes / standard including correction curves, meeting the specification requirements along with sample calculations & detailed activity plan of preparation (including test instrumentation), conductance and evaluation of Guarantees.

However, correction on account of variation in Reheater spray quantities with respect to values used for the purpose of turbine cycle heat rate values shall be permitted only to the extent that such variations are solely attributable to the change in coal properties with respect to those specified for the design coal.Bidders shall necessarily include the correction curves for variation in reheater spray quantities with coal properties in his bid proposal, failing which no corrections shall be permitted.

Bidder understands that correction curves can be submitted within 90 days of date of NOA.

Please confirm.

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8 II Ch 8 3.10.2 (e ) Sheet 25 of 78

e) Mill Reject SystemCompressor: Duty Factor 1.0 (per unit power consumption shallbe 66% of Power Consumption of the working compressor)

Clarification-4, Sr. No. O2 (1), Pg. 76 of 109 (Query)For compressors, per unit power consumption shall be 50% of Power Consumption of the working compressor.Please confirm.

Clarification-4, Sr. No. O2 (1), Pg. 76 of 109 (Reply)Confirmed for each side shall be 100% not 50% or 66%.

Bidder understands that for mill reject system, duty factor to be considered as one(1).

Confirmed.

For increase in ammonia consumption rate (in Kg/hr/unit, 99.5wt%) at 100% TMCR load

For increase in limestone consumption of FGDsystem in 100 kg/hr./unit at 100% TMCR load

10 Volume II

General &

Schedule

s

Ch 8 : Functional

Guarantee & Liquidated Damages

3.1

Note for (xi)

6 of 78 Contractor’s design shall ensure that the SO2 removal efficiency from FGD shall not be more than 80 mg/nm3 (6% O2 dry basis) under guarantee point condition. The corresponding SO2 removal efficiency from FGD shall be worked out.

Bidder understands the clause as "Contractor’s design shall ensure that the SO2 removal efficiency Emission from FGD shall not be more than 80 mg/nm3 (6% O2 dry basis) under guarantee point condition as mentioned in FGD chapter. The corresponding SO2 removal efficiency from FGD shall be worked out shall be guaranteed.

Bidder understanding is correct

9 Refer amendment 17.I Section-3 BDS

ADJUSTMENT

FACTORS FOR BID

EVALUATION

These bid evaluation parameters are missing in Attachment-6(P). Kindly amend the same.

Bidder understands that both these values are to be guaranteed considering design coal. Please confirm.

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11 Volume II

General &

Schedule

s

Ch 8 : Functional

Guarantee & Liquidated Damages

4.0 GUARANTEES UNDER

CATEGORY-II

4.1.2

26 of 78 4.1.2 SOX EmissionContractor’s design shall ensure that the SO2 removal efficiency from FGD shall not be more than 80 mg/NM3 (6% O2 dry basis) under guarantee point condition.

Bidder understands the same as 4.1.2 SOX EmissionContractor’s design shall ensure that the SO2 removal efficiency emission from FGD shall not be more than 80 mg/NM3 (6% O2 dry basis) under FGD guarantee point condition as defined in FGD chapter.Please confirm

4.1.2 SOX EmissionContractor’s design shall ensure that the SO2 removal efficiency from FGD such that the emission shall not be more than 80 mg/NM3 (6% O2 dry basis) under guarantee point condition.

12 Volume I

ATTACHMENT - 8

3 of 14 III. Flue Gas Desulphurisation Systemi)- viii) referred 1.03.05 (i) to (viii),

The referred clauses 1.03.05 (i) to (viii) are not provided. Bidder requests purchaser to provide the same.

Refer amendment 17 and addendum 04.

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Page 10 of 34

Sl.No.

Amendment/ Clarification

ReferencePart Sub Section Clause No page Specification / Customer Owners' Reply Other Bidders Query Owners Reply Bidder Query Owner's Response

1 Amendment No 10 Page 1 0f 2 & 2 of 2

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).

Minimum Seven (7) no’s of coal pulverisers shall be provided for each steam generator.

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.

3 _ 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.

_ _

4 Clarification-8 Page No 12

Volume IIIMechanical Works

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

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.

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

Bidder would like to inform SJVNL that the Rotor is a fabricated Component and Life Guarantee for 25000 Hrs is not possible for a rotor in dusty & abrasive enviroment.

Hence, Bidder would request to amend the requirement of Wear Life Guarantee of Mill Dynamic CLassifier Rotor to 15000 hrs.

Provision as per bidding specification shall prevail.

EPC PACKAGEFOR



2 Clarification-12 Page 3 of 13

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.

The number of mills shall beminimum 8 and the same may be arranged in the front or in sides or inrear.

Accepted that minimum Seven(7) no’s of coal pulverizers shallbe provided for each steamgenerator.

F.

Volume III Section -1, Chapter 1 SG and Auxillaries

Bidder would like to draw Owner's kind attention to CEA’s guideline of Jul’13, which specifies minimum no. of mills as 6 for 660 MW plant. Only for 800 MW plants CEA recommends 8 nos. of mills.Further it may be noted that MHPS’ state of the art furnace design uses twin fire vortex configuration with tangential firing, wherein each mill caters to 8 burners per elevation. With this furnace design and with MHPS state of the art higher capacity mills, we meet the mill sizing criteria, without diluting the standby requirement, with 6 mills (min).

For a 6 mill configuration MHPS design provides 6x8=48 burners where as other bidders provide only 8x4=32 burners in a typical 8 mill configuration. Our design of twin vortex furnace permits the use of 6 mills configuration, even while maintaining lower heat loading per burner compared to our competitors. We are seriously handicapped & disadvantaged when minimum number of mills are specified as 8, requiring 8x8=64 burners in our case. The specification in the presentform is penalizing a bidder having superior technology by forcing him to provide 64 nos. of burners vis-a-vis 32 nos. of burners provided by competition.

NTPC has realised this anomaly & has accepted minimum 7 mills in Talcher project thereby setting right the disadvatage & bringing us at par with the competition andthereby providing a level playing field.

We are forced to bring up this issue once again for your kind intervention & dispensation, that the issue would be looked into in the right perspective and resolved. We would request amendment beissued at the earliest in this regard accepting atleast 7 mills inline with NTPC Tacher specifications (Please refer Appendix-3 To Enclosure-2 ), so that we can proceed with our proposal preparationfor a most competitive price bid.

6 mills operating with maximum 90% loading at 100%TMCR for all specified coal with one stand by.

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Sl.No.

Part Sub Section

Clause No page Type (C/D) Specification / Customer Deviation/Clarification

2.1 2 of 78 General Requirements 10. The Performance test shall be carried outas per the agreed procedure.The PG test procedure including demonstration tests shall be submittedwithin 90 days of the date of Notification of Award and finalization of thePG test procedure shall be done within 180 days from the date ofNotification of Award.11. The PG test procedures shall be submittedfor equipments/ system &subsystem under Contractor's scope for all Guarantees under category I,II & III as mentioned below, as per latest International codes / standardincluding correction curves.......

3.7 15of 78 MAJOR REQUIREMNTS/ METHOD OF STEAM GENERATOR EFFICIENCYTESTS k) The Bidder shall furnish correctioncurves……These curves shall be submitted along with Techocommercial bid (Stage-I)

Confirmed.5 VOLUME II General & Schedules

Ch 8 : Functional Guarantee & Liquidated Damages

C Bidder shall furnish applicable crrection curves for guaranteed parameters along with PG test procedure inline with tender specification outlined in Vol. II, Chapter 8, Clause no. 2.1 , point 10 & 11. Please confirm.

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Page 12 of 34

Owner's Response

Sl.No.

Part Sub Section


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VOLUME II General & Schedules


3.6 14 of 78 SPECIFIC AND LIMITING REQUIREMENTS FOR STEAM GENERATOREFFICIENCY

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 III Mechanical Works


2.1.7.1 4 of 120 The Steam Generator design shall comply with the following limitingparameters with 'design coal' firing, under stipulated ambient air conditioni.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 loadsvalue whichever is higher.

6 C We understand that for efficiency calculation, Clause 2.1.7.1.iii) is to be followed for calculating the Guaranteed Boiler efficiency. Therfore clause 3.6 to be amended as below:

The guaranteed efficiency quoted by the Bidder shall comply withfollowing limiting parameters with design coal firing :

c. Unburnt fuel Carbon in Ash at allefficiency 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.

Date-02/02/2019

Page 13 of 34

Owner's Response

Sl.No.

Part Sub Section


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7 VOLUME II General & Schedules


3.7 14 of 78 C MAJOR REQUIREMNTS/ METHOD OF STEAM GENERATOR EFFICIENCYTESTS d) 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 as the temperature of air (i.e. 27degree 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. 27degree 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 C MAJOR REQUIREMNTS/ METHOD OF STEAM GENERATOR EFFICIENCYTESTS f) 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

Date-02/02/2019

Page 14 of 34

Owner's Response

Sl.No.

Part Sub Section


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3.10.1 22 of 78 C Unit Auxiliary Power Consumption

Note3. Number of coal mill and coal feeders shallbe corresponding to the designcoal.

Guaranteed auxilliary power consumption shall be provided for all continuously operated auxiliaries (including coal mills, coal feeders etc.) at 100% TMCR load with design coal firing.

Further, SCR system auxiliaries is a continosuly running euipment and hence to be included as one of the Consumer in the list indicated under clause 3.10.1 for calculating Unit Auxillary Power Consumption Hence Bidder request SJVNL to amend the Guarantee Chapter to include SCR also..

Necessary correction curves for auxiliary power consumption guarantee shall be provided during execution stage. Please confirm.

Guaranteed power consumption shall be for the design coal. SCR and other auxiliaries not mentioned here shall also be considered.

Guaranteed power consumption shall be for the design coal. SCR and other auxiliaries not mentioned here shall also be considered.

Confirmed that Necessary correction curves for auxiliary power consumption guarantee shall be provided during execution stage.

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Page 15 of 34

Owner's Response

Sl.No.

Part Sub Section


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5.6 28 of 78 C GUARANTEES UNDER CATEGORY-III

Superheater and reheater attemperation system

It shall be demonstrate that the spray water flow of SH attemperation systemdoes not exceed 8% of main steam flow, at superheater outlet, while firing anycoal from within the range specified with HP heaters in service whilemaintaining the rated SH outlet steam temperature at all loads upto andincluding BMCR. It shall also be demonstrate that the RH temperature ismaintained at the rated value without any spray water requirement undernormal operating conditions.

Bidder understands that control range for SH and RH outlet temperature is from 50% TMCR to 100% BMCR; hence SH and RH outlet temperature shall be maintained from 50% TMCR to 100% BMCR.

Bidder shall demonstrate that spray water flow of SH attemperation system shall not exceed 8% of main steam flow, at superheater outlet, while firing any coal within the range specified with HP heaters in service within the control range.

Further, we understand that normal operating conditions for which bidder shall demonstrate no spray while mantaining the RH outlet temperature shall be from 50% TMCR to 100% TMCR with design coal firing.

Bidder Understanding is correct.



3.8 15 of 78 C MAJOR REQUIREMENTS FOR COAL PULVERISER WEAR PARTWARRANTY

The Contractor shall warrant the wear life of all wear parts of the coal pulveriser when grinding the specified range of coal(s). Pulveriser wear parts are defined.. . . . . . . . . . . . . . . . . . . . . . . . . however be corrected for the variation in YGP index for the coal fired during GTP.

YGP index for specified coals is not indicated in the revised fuel analysis document " Appendix-II (Rev-01): Coal Quality Parameters". Bidder has considered coal YGP as 80 mg/Kg for coal pulvizer wear part warranty purposes.

YGP index will be considered as per bidder's standard practice.

Date-02/02/2019

Page 16 of 34

Owner's Response

Sl.No.

Part Sub Section

Desc page Type (C/D) Specification / Customer Clarification Refrence Bidder's Query Refrences Owner's reply

12 Volume III Ch 1 SG & AuxiliariesSection 2 : Design Basis of SG & Auxiliaries and SCR

2.21.4 (1, iv, b)

The vertical clearance distance between top edge of catalyst module andbottom edge of the bearing support structure for the next layer above itor the layer of flow modification device shall be at least 2000 mm

- The vertical clearance distance between top edge of catalyst module andbottom edge of the bearing support structure for the next layer above itor the layer of flow modification device shall be at least 1500 mm. This height shall be suitable enough for maintenece purpose and it is similar to the interbank height for Pressure Parts

Attached RefrenceNo 3 from NTPC Tacher Amedment where vertical Clearence is mentioned as 1500 mm



6 of 120 2.1.11. Steam generator shall be capable of operation with HP heaters out ofoperation. The steam generator heat output under HP heaters out conditionshall be at least 100% BMCR heat duty.

- The steam generator output will be sufficicent to meet the power output of 660 MW at TMCR load with HP heater out of service

- The provision as per bidding specification shall prevail.

14 Volume II Ch 8 Functional Guarantee &Liquidated Damages

31 of 78 5.19 (i)(a)(i) Coal Pulveriser capacity at rated fineness(a) The Contractor shall demonstrate capacity output on one coal pulveriser (of Employer’s choice) of Steam Generator for stablishing its capacity at(a) The Contractor shall demonstrate capacity output on one coal pulveriser (of Employer’s choice) of Steam Generator for establishing its capacity at

As per Clarification no. 04, dated 29.10.2018, Pg No. 29 of 109, Sl. No. 175 client replied as the provision as per bidding specification shallprevail.

Bidder proposes that the definition of New set of grinding elements may be defined as maximum wear depth 0.25” of grinding elements or 500 hours of operation,whichever is earlier.

- The definition of New set of grinding elements may be defined as 2000 hours of operation from the date of handing over.

15 Volume IIIMechanical Works

Ch 1: SG & Auxiliaries

Section 2 : Design Basis ofSG & Auxiliaries and SCR

29 of 120 2.9.1. v) Air preheater Construction shall conform tofollowing: 2. Heating Elementsa) Cold end tier of elements shall be designeddeep enough to encapsulate any Ammonium Bisulphate (ABS) and acid condensation fouling 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 per bidding 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 enamel thickness 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 thk and 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, therefore minimising 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 is envisaged for proper Offline CLeaning of APH Baskets during shutdown.

Attached Refrence from NTPC Talcher Amendment No 4on Page no 14 of 19 , where Enamelling has has been removed.

Enamiling of APH elements or corten steel with minimum 1.0 mm thickness for hot end 1.2 mm thickness for cold end shall be considered

16 Volume VI Ch 07 Material 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 .


Bidder would like to inform that Coal flowability issue is in the Conical Hoppper only and Bidder will provide steel lining in that portion. Vertical portion does not require any SS lining as flowability is not a issue there.

Attached Refrence No 5 from NTPC Talcher where Lining is required only for Conical Portion


17 Volume VI Ch 10 RCC Strucure &Foundation

Page 12 of 36

10.14 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


Boiler and ESP support structures shall be check 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

Attached Refrence No 6 from NTPC Singrauli


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Sl.No.

Part Sub Section

Desc page Type (C/D) Specification / Customer Clarification Refrence Bidder's Query Refrences Owner's reply

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18 Volume VI Ch 6 GeneralRequirement of Building& Structure

Page 3 of 09 6.08.00 All handrails shall be of 32mm nominal bore MS pipes (medium class) as per IS:1161 galvanised using 750 gm/sq. m of zinc. Handrails for platforms, walkways and projections shall be a two-rail 450mm below the top rails.Handrail post spacing shall be limited to 1500mm as far as possible but can be proportioned to the length of the protected horizontal opening. Handrails shall be shop fabricated for specific locations and field welded or bolted to the erected structural steel. For platforms at elevation more than 30m, three rail system with top rail at 1500mm shall be adopted.


All handrails shall be of 32mm diameter MS pipes (medium class) as per IS:1161 galvanisation of 610 gm/sqm of zinc.

Attached Refrence No 7 from NTPC Talcher



108 of 120 2.21.10 (7) Dilution tank shall be constructed of corrosion resistant material such as A240-304 / 6 or equivalent.

- Dilution tank shall be constructed of SA 516 Gr.70 or equivalent. Since, dilution tank is a water tank with very low ammonia concentration. Hence, Carbon steel is sufficient for this application.

Attached Refrence No 8 from NTPC Talcher

The provision as per bidding specification shall ptrevail.

Date-02/02/2019

Page 18 of 34

Sl. No. Volume No. Section/ Chapter No.

Clause No Page No Description as per tender document Bidder's Query Owner's Response

1 Vol-I Attachment-8 (Demonstration Parameters/ Capabilities)

1.03.03(i), '1.03.03 (ii),1.03.03 (iii), 1.03.03 (iv), 1.03.08, 1.03.22, 1.03.04(i), 1.03.04 (ii), 1.03.04 (iii), 1.03.04 (iv), 1.03.05(i), 1.03.05 (ii), 1.03.05 (iii), 1.03.05 (iv), 1.03.05 (v), 1.03.05 (vi), 1.03.05 (iv), 1.03.05 (v), 1.03.16, 1.03.21, 1.03.24(a), 1.03.17, 1.03.18, 1.03.19, 1.03.15,1.03.06,1.03.25, 1.03.22

Steam Generator and AuxiliariesNOx Control System, Flue Gas Desulphurisation System, Equipment Cooling Water System(Station & Unit Auxiliaries), Condensate Polishing Plant, ACW Chemical Treatment Plant, DM PLANT (ION EXCHANGEDEMINERALISATION PLANT), DM Plant (UF+RO+MB PLANT), Fire Detection & Protection system, Air Conditioning and Ventilation System, Hydrogen Generation Plant,Air Compressor System

The referred clauses mentioned in Attachment-8 are not found in Ch-8 ( Functional Guarantee & Liquidated Damages) , Book 1 of 2, Vol-II.

The commented Attachment-8 with suggested changes as per our understanding is enclosed as Annexure-1 for your ready reference.

Owner is requested to correct the clauses in line with Ch-8 and issue an amendment for Attachment-8.

Refer Amendment 17 and Addendum-04.

2 Vol-I

Vol- II

Attachment-8 (Demonstration Parameters/Capabilities)

Ch 8 : Functional Guarantee &Liquidated Damages

b

5.19 (i)

-

31 of 78

I. Steam Generator and Auxiliaries

(b) Capacity at originally installed ............................................................... T/hr.grinding elements in nearly worn out condition or at the end of guaranteed wear life (whichever is earlier) at 100% mill loading (with value not less than 90% of value indicated at(a) above

(b) Further, Contractor shall also demonstrate capacity output on four coal pulverisers (of Employer’s choice) of Steam Generator, not less than the 85% of guaranteed value of (a) above, at 100% mill loading with the originally installed grinding elements in nearly worn-out condition or at the end of guaranteed wear life of grinding elements, whichever is earlier.

There is contradiction between Clause "b" of Attachment-8 and clause 5.19 (i), (b) of Ch-8 regarding mill loading percentage.

Bidder understands that this should be 85% as per clause 5.19 (i), (b) of Ch-8.


Please confirm and issue amendment for Attachment-8.

Mill Loading shall be taken as 90%.Refer amendment 17.

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G.

Attachment-8

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Page 19 of 34



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3 Vol-I

Clarification-02


1.03.04 (v),

1.03.04 (vi),

-

12 of 248

Pressure drop across SCR and Cyclone separator as per clause 1.03.04 (v),Ch- 8, Book 1 of 2, Vol-II ....................................... mmwc

Cyclone Separator Efficiency as perclause 1.03.04 (vi), Ch- 8, Book 1 of 2, Vol-II ..

The provision of Cyclone separator is deleted.

As per Clarification-02, Sl.No.27, Page No. 12 of 248, Cyclone Separator has been deleted, hence referred clauses for Cyclone separator are not applicable.


Please issue an amendment for Attachment-8 deleting "cyclone separator pressure drop" and "cyclone separator efficiency" .

Refer Amendment 17

Date-02/02/2019

Page 20 of 34



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4 Vol-I

Vol-II



X., (i)

5.25.3, A.)

-

34 of 78

Flow Path IA (Direct Stream):

Apron feeders 1/2/3 taking feed of incoming coal from Wagon Tipplers 1/2/3 discharging crushed coal into last bunker of Unit #3 through travelingtripper. ...................................................MTPH

Flow Path IIA (Stacking Stream):Apron feeders 1/2/3 taking feed of incoming coal from wagon tippler WT 1/2/3 ......... .MTPHFlow Path III (Reclaiming Stream):Reclaiming coal from stockyard.....feeding last bunker of Unit #3.................MTPH

Flow Path D-1 (Direct Stream):Apron feeders #AF-1A/2A & AF-1B/2B taking feed of incoming coal from wagon tipplers #WT-1A & #WT-1B and discharging crushed coal into Coal Bunker of Units-1 & 2 through traveling tripper.

There is contradiction in the no. of apron feeders & the no. of units to be fed as mentioned in Attachment-8 & Ch-8 ( Functional Guarantees).

Bidder understands that CHP guaranteed shall be demonstrated in line with referred clause 5.25.3, A.) of Ch-8.


Please confirm and issue an amendment for Attachment-8.

Refer Amendment 17

5 Vol-I

Vol-II



X., (i)

5.25.3, b.)

-

35 of 78

Flow Path IB (Direct Stream):

Paddle feeder taking feed of incoming coalfrom track hopper and discharging crushedcoal into last bunker of Unit #3 throughtravelling tripper mounted on Bunker Conveyorincluding all intermediate Conveyors and equipment .................................. MTPH

Flow Path D-2 (Direct Stream):Rotary discharge machine RDM#1A / RDM#2A & RDM#1B / RDM#2B taking feed of incoming coal from Track Hopper #TH-1 and dischargingcrushed coal into Coal Bunker of Units-1 & 2 through traveling tripper mounted on bunker feeding tripper conveyor #TBC-1A/#TBC-1B & #TBC- 2A/#TBC-2B including all intermediate conveyors and equipment.

There is contradiction in the no. of units to be fed as mentioned in Attachment-8 & Ch-8 ( Functional Guarantees).


Bidder understands that CHP guaranteed shall be demonstrated in line with referred clause 5.25.3, B.) of Ch-8.

Please confirm and issue an amendment for Attachment-8.

Refer Amendment 17

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Page 21 of 34



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6 Vol-I

Amendment-06


Annexure-IV- Drg.No. 111-12-6601 Flow diagram of Limestone Handling System

X., (iv), (v)

3

-

2 of 3

Limestone unloading stream:

Flow Path iv (a):Apron feeders 1/2/3 taking feed of incominglimestone from Wagon Tipplers 1/2/3 anddischarging crushed limestone to limestonestorage shed through travelling tripper ............ MTPHFlow Path iv (b):Paddle feeder taking feed of incoming limestonefrom track hopper and discharging crushed limestoneto limestone storage shed through travelling tripper ................................ MTPHLimestone reclaiming stream: Flow path-v:Reclaiming limestone from limestone reclaim hopperusing paddle feeder and feeding to last bunker oflimestone mill bunker.............. MTPH

Crushers are not envisaged in the system.

Discrepancies observed in referred clauses for limestone unloading, feeding and reclaiming arrangement.

As per flow diagram no. No. 111-12-6601, Apron feeders and Paddle feeders are not applicable for limestone handling system.


Please issue an amendment for Attachment-8 incorporating the changes.

Refer Amendment 17

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Page 22 of 34



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1 Vol-I

Vol-II

Attachment-6(P)


x

3.1, vi.)

2 of 3'

5 of 78

Minimum life of coal pulveriser wear parts in hours of operation for entire range of specified coals (in accordance with Clause 3.1 (v), Function Guarantee & Liquated Damages, Vol-II.

Coal Mill Wear Parts WarrantyLife of coal pulveriser wear parts, in hours of operation, for the entire range of coal characteristics specified. (To be demonstrated as per clause 3.08 of this chapter).

There is contradiction between Clause "x" of Attachment-6(P) and clause 3.1, vi.) of Ch-8 regarding Coal Mill Wear parts warranty.

Bidder understands that this should be as per clause 3.1, vi.) of Ch-8.

The commented Attachment- 6(P) with suggested changes as per our understanding is enclosed as Annexure-2 for your ready reference.

Please confirm and issue amendment for Attachment-6(P).

Refer Amendment 17

2 Vol-I

Vol-III

Attachment-6(P)


x, (e)

2.10.5.14 39 of 120

(e) Ceramic material wherever provided (hours of Operation): As per 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 not specified in cl. no. 2.10.5.14 of Vol-III, hence, Owner is requested to delete this from Attachment-6(P).


Refer Amendment 17

3 Vol-I

Vol-I

Attachment-6 (P)

BID DATA SHEETS (BDS)

-

h)

-

54 of 63

-

Guarantee:For increase in ammonia consumption rate (in Kg/hr/ unit, 99.5wt%) at 100% TMCR loadRate of Bid evaluation (BEF):INR 7,624,000/- (INR Seven Million Six Hundred Twenty Four Thousand only) (or equivalent foreign currency) for every 1 Kg/hr increase in ammonia consumption rate from the guaranteed value

As ammonia consumption rate for SCR is under evaluation as per clause "h" of vol-1, page no 54 of 63, the same should be added in ATTACHMENT - 6(P).


Noted.Refer amendment 17.

4 Vol-I

Vol-I

Attachment-6 (P)

BID DATA SHEETS (BDS)

-

i)

-

55 of 63

-

Guarantee:For increase in limestone consumption of FGD system in 100 kg/hr./unit at 100% TMCR load

Rate of Bid evaluation (BEF):INR 21 Million (Rupees Twenty One Million only) per 100kg/hr. increase in Limestone Consumption

As Limestone consumption rate for FGD is under evaluation as per clause "h" of vol-1, page no 55 of 63, the same should be added in ATTACHMENT - 6(P).


Noted.Refer amendment 17.

Attachment-6 (P)

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5 Vol-I Attachment-6(P) x 2 of 3' Minimum life of coal pulveriser wear parts in hours of operation for entire range of specified coals (in accordance with Clause 3.1 (v),Function Guarantee & Liquated Damages, Vol-II

For submitting pulverizer Grinding Element Guaranteed Life,YGP index of coal is required.

Owner is requested to provide YGP index of Coal.

YGP index will be considered as per bidder standard practice.

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1 Vol-I

Vol-II

Amendment-04

Schedule-9:Schedule of take out price

Ch 1 : Intent of Specification

Ch 1 : Intent of Specification

I.

4.2

1.

1 of 5

9 of 12

1 of 7

Fuel oil for firing up to successful completion of 'Initial Operation' in each unit as per Clause No. 4.02.00, Ch-2, Vol II

Pre-commissioning and commissioning activities

The contractor's scope shall include all pre-commissioning and commissioning activities, materials and services as detailed in other portion of technical specifications including supply 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 pre-commissioning and commissioning activities and subsequent initial operation.

4.2...............................Fuel Oil for firing up to successful completion of “Initial Operation” (as defined in General Technical Requirements, Volume II, Chapter 5 of Technical Specification) of the units shall be supplied by the contractor.

The referred clause 4.02.00, Ch-2, Vol II is not available in Ch-2, Vol-II.

As per bidder's understanding, the correct clause shall be 4.2 of Ch-1, Vol-II and subsequent amendment no 04.

The commented Schedule-9 with suggested changes as per our understanding is enclosed as Annexure-3 for your ready reference.

Please issue suitable amendment for schedule-9.

Refer Amendment 17

2 Vol-I

Vol-III

Schedule-9:Schedule of take out price

Ch.2 : Steam Turbineand its Auxiliaries

IV.

1.8.1

2 of 5

7 of 12

1x30% motor driven boiler feed pump complete withbooster pump along with its drives, mechanical sealsflexible couplings, hydraulic couplings, gear box, baseplate(s), forced lube oil system (including oil pumps,oil tank, lube oil coolers, working oil coolers, duplexoil filters etc.), recirculation.

For start-up & low load operation, 1x50% motor driven boiler feed pumps for each unit complete with booster pump................

There is contradiction between Clause "IV" of Schedule -9) and clause 1.8.1 of Ch-2, Vol-III regarding motor driven boiler feed pump.

Bidder understands that this should be as per clause 1.8.1 of Ch-2, Vol-III.


Please issue suitable amendment for Schedule-9.

Bidder shall consider 1x50% motor driven boiler pumps for each unit complete with booster pump.Refer amendment 17.

Schedule-9

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Page 25 of 34



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1 Vol-I

Vol-III

Schedule Number- 10 : Schedule of Unit Rates


1.

2.17.18.

1 of 4

80 of 120

Unit rate per square meter of platform floor area- Supply and Installation for addition/deletion of platform floor area withrespect to platform area (Base) of 20,000 m2 as per clause no. 2.20.04 of Vol III

For meeting the above requirement in respect of platforms the Bidder shall include in his proposal platform area of 18,000 m2 (clear of all intervening pipes, columns, actuators, instrument enclosures, racks etc. and excluding area covered by stairways).

There is contradiction between Clause "1" of Schedule -10 and clause 2.17.18 of Ch-1 regarding platform floor area.

The same should be18,000 m2 & required as per tender specification clause no. 2.17.18 of Ch-1, Section-2,Vol -III.



Bidder shall consider Platform floor area of 18000 m2 as per clause no. 2.17.18 of Ch:1, Section-2, Vol -III

2 Vol-I Schedule Number- 10 : Schedule of Unit Rates

2. 1 of 4 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 7.03.01 of Vol-III.

(i) For chromel - Alumel thermocouple(ii) For Acromat thermocouple

The referred clause is not available in Vol-III. Hence, this clause should be deleted from Schedule -10.



Refer Amendment 17

3 Vol-I

Vol-III

Schedule Number- 10 : Schedule of Unit Rates


3.

2.3.1. (21)

2 of 4

15 of 120

Unit rate (per thermocouple- Supply and Installation) for addition/deletion of thermocouple for variation from the base quantity specified in clause 3.08.00 of Vol -III

For continuous monitoring of water wall tube metal temperatures provide 100 numbers of thermocouples outside the gas path as per specification specified elsewhere in the Technical Specification.

The referred clause is not available in Vol-III.

The correct reference should be as per tender specification clause no.2.3.1. (21) of Ch-01, Section 2, Vol-III.



Refer Amendment 17

Schedule-10

Date-02/02/2019

Page 26 of 34



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3. 2 of 4 Unit rate for increase/decrease in Aux. PRDS capacity in T/hr.with respect to base capacity specified at clause 1.1.10, VolI-II

The referred clause is not available in Vol-II.

The correct reference should be as per tender specification clause no1.1.10 of Ch-01, Section-1, Vol-III.



Refer Amendment 17


5 2 of 4 Unit rate for addition/deletion in MV switchgears as perclause no. 1.19.00 of Vol-III of each rating(a) 3.3kV DA Type feeder(b) 3.3kV DB Type feeder(c) 11kV DBF Type feeder(d) 11kV DE Type feeder(e) 11kV DB Type feeder(f) LV panels for 33kV /3.3 kV and 11 kV switchgears

The referred clause number 1.19.00 is not available in Vol-III.

Further, Owner to provide the meaning of various types of feeders mentioned as (a) DA,(b) DB, ( C) DBF, (d) DE and ( e) DB in the referred clause.


Owner may please specify correct clause number and volume number for the referred clause else Owner to delete the clause no 5 from schedule-10 and issue suitable amendment.

Refer Amendment 17

Date-02/02/2019

Page 27 of 34



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Schedule-8A and Schedule-8B

1 Vol-I PRICE SCHEDULESSchedule-8A _____ PRICE SCHEDULESSchedule-8B

3 ( E )

_____ 3 ( E )

8 of 31_____

9 of 32

(E) StartupTransformer(a) Temperature rise test 1 No.(b) Zero sequence impedence measurement test 1 No.(c) Measurement of harmonics of the no load current 1 No.(d) Measurement of accoustic noise levelas per NEMA TR-1 1 No.(e) IPVD test as per IEC-60076-3 1 No.

The referred list of type test is not applicable for 2x660MW Buxar project. Hence, bidder request Owner to issue amendment deleting the line item from both Schedule 8A and 8B.

The commented Schedule-8A & 8 B with suggested changes as per our understanding is enclosed as Annexure-4 for your ready reference.

Refer Amendment 17


10_____

10

22 of 31_____

23 of 32

Generator Circuit Breaker(a) Rated dielectric strength tests(i) Rated low frequency withstand voltage dry test(ii) Rated full wave impulse withstand voltage level(b) Short circuit rating and transient recovery voltage tests(i) Test for rated symmetrical short circuit current interrupting capability, duty cycle and rated transient recovery voltage parameters(ii) Test for rated closing, latching and short time current carrying capability(iii) Test for rated Generator source asymmetrical short circuit interrupting capability(c) Load current switching test(d) Out of phase switching current tests(e) Rated excitation current switching tests(f) Type tests and oscillographic test records for closing and tripping timings for generator circuit breaker of the rating offered

Since Owner has already agreed in prebid clarification No.2, point no.1 of F-Electrical, page no. 150 of 248, that the referred clause is not applicable for this project. However, deletion of clause from the list is pending.

Hence, bidder request Owner to issue amendment deleting the line item from both Schedule 8A and 8B.


Refer Amendment 17

Date-02/02/2019

Page 28 of 34



EPC PACKAGEFOR




11_____

11

23 of 31_____

24 of 32

VFD system for condensate transfer pump motor(a) Reactor (If applicable)(i) Lightning impulse test(ii) Heat run test(iii) Short time current test(iv) Noise Level test(b) Transformer(i) Short circuit test on transformer(ii) Noise level(iii) Measurement of harmonics ofno load current(iv) PRD operation test(v) Degree of protection test onmarshalling box(vi) Zero sequence Impedance(not applicable for Delta- delta transformer)(vii) Temperature rise test(viii) Chopped Wave Lightning impulse test onHV & LV winding as per Cl. 14 of IEC 60076-3(c) Complete VFD SystemOverall efficiency determination of VFD system includingtransformer/ Harmonic filters etc at motor full load

Since Owner has already agreed in prebid clarification No.2, point no.2 of F-Electrical, page no. 150 of 248, that the referred clause is not applicable for this project. However, deletion of clause from the list is pending.

Hence, bidder request Owner to issue amendment deleting the line item from both Schedule 8A and 8B.


Refer Amendment 17

Date-02/02/2019

Page 29 of 34



EPC PACKAGEFOR



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 coal condition 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 guarantee PM <17 mg/Nm3 atTMCR 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.

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.

333.1.2/JCh 33Vol. III4

Date-02/02/2019

Page 30 of 34

Sl. No.

Volume No.Section/

Chapter No.Clause no. Description as per tender document Query Owner's Reply Received Bidder's Query Owner's Reply

1 PREBID CLARIFICATION

S-08Date-22/12/2018

U. ELECTRICA

LU1.

AdditionalPage 42 of

42

Vol VIISLD Dwg. No.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. AWRTB 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.

P lease kindly confirm the following points pertaining to 11kV Transmission line from plant boundary wall to Ash Water Recovery PMCC :-

1. Single Circuit or Double Circuit 11kVTransmission Line to be provided - please confirm.2. Route length of subject transmissionline.3. Subject 11kV transmission line shall bemade of Lattice type towers or Rail poles - please confirm.4. P lease confirm type & size of overheadconductor to be provided for subject 11kV transmission line.5. Required Current Rating for subjecttransmission line.6. P lease provide complete technical

ifi ti t d i f11kV

Ash water recovery system is located inside the plant boundary and hence cables shall be used. Off load isolator shall be provided in case the cable length exceeds 1.25kM.

In case over of Raw Water Intake System, from 11kV switchgear upto boundary, cables shall be used. Beyond the boundary wall, 11kV overhead lines double circuit shall be routed along the pipeline. Off Load Break Isolator to be provided before each transformer.


S-08Date-22/12/2018

U. ELECTRICA

LU1.

AdditionalPage 42 of

42

Vol VIISLD Dwg. No.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. AWRTB 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.

SJVNTPL to take care ofobtaining any Right of Way, Land acquisition including compensation to land Owners, tree cutting and payment of fees to concerned authorities for 11kV Transmission line. SJVNTPL to also take care of any existing Road / Railway line / Power line / Telecommunication line crossing in the route. Approval for 11kV Transmission line route (Right of way) and all necessary clearances shall be arranged by M/S SJVNTPL. Coordination with any external agency by BHEL is not envisaged. Acceptance confirmation required from S

Double circuit Overhead lines (with poles) for the Raw Water Intake system beyond the boundary wall shall be routed along the raw water pipes.

SJVN will take care of obtaining any Right of Way, Land acquisition including compensation to land Owners, tree cutting and payment of fees to concerned authorities for 11kV Transmission line. All other approvals shall be taken care by the bidder.

3 VOLUME IV : ELECTRICAL

WORKS

CHAPTER – 29

400 kV GAS INSULATE

D SWITCHGE

ARPage 2 of 71

29.01.01 The Switchgear shall be complete with all necessary terminal boxes, SF6 gas filling, interconnecting power & control wiring, grounding connections, gas monitoring equipment & piping, Partial dischargemonitoring system, support structures, necessary fire fighting arrangement, ventilation & air conditioning equipment, EOT crane etc.

i) P lease confirm type of partial dischargemonitoring system to be provided for subject 400kV GIS & 220kV GIS - is it online continuous type monitoring system or portable PD monitoring system.ii) P lease also kindly provide technicalspecification of applicable partial discharge monitoring system since same is not available in technical specification.

i) Conituous type for 400kV and portabletype for 220kV.

ii) UHF method.

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H.

Date-02/02/2019

Page 31 of 34

Sl. No.

Volume No.Section/


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WORKS

CHAPTER – 29

400 kV GAS INSULATE

D SWITCHGE

AR

29.42.00 A set of special tools & tackles which are necessary or convenient for erection, commissioning, maintenance and overhauling of the equipment shall be supplied.

Please kindly provide list of special tools & tackles if any required for 400kV & 220kV GIS since same is not available in technical specification.

Refer Addendum-04.

5 VOLUME VI : TENDER

DRAWINGS-MECH LAYOUTS

PLOT PLAN

Dwg. No. 111-29-0200, Rev-

0

Outgoing Transmission Line Corridor Please kindly indicate on plot plan 400kV (2 Nos.) & 220kV (6 Nos.) Transmission Line evacuation corridor for correct placement of outgoing line gantries & accurate gas insulated bus duct estimation (GIB being substantially expensive item).

Bidder to quote based on past experience.


S-08Date-22/12/2018

A. WATER TREATMENT SYSTEMPage 1 of 42

Vol VIIPlot P lan

(Sl . No.- F-06 Page 13)Clar06

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

Owner's Response : Shown in the revised Plot P lan.

Revised Statement of Clarification sought : No revise P lot P lan is received with Pre Bid Query Reply. SJVN to provide the revise P lot P lan.

Owner's Response : Refer amendement No 08

Please kindly provide plot plan indicating outgoing line corridor since any plot plan not available in Amendement No.- 08.

Please provide coordinates of dead end towers of 400 kV & 220 KV Outgoing Lines.

i) P lot P lan already uploaded.

ii) Dead end towers (outgoing tower whereTransco shall connect the line conductor) of 400kV & 220kV shall be located maximum 50 metres inside the plant boundary.


S-09Date-22/12/2018

Page 16 of 18

Annexure-I : Illumination

Levels for GIS

5. Cable vault room & LT Transformerroom

i) P lease confirm where cable vault is to beprovided in switchyard - in switchyard control building ?ii) P lease confirm where cable vault is tobe provided underground / basement or above ground in ground floor.

The cable vault shall be located above ground.


WORKS

CHAPTER – 29

400 kV GAS INSULATE

D SWITCHGE

ARPage 5 of 71

29.02.05 x) x) All associated Civil and structural works including 400 kV GIS building, Switchyard Control Room, Lattice Structures, Gantry,Equipment structure / foundations, Switchyard fencing etc.

P lease confirm width of gantries required in switchyard :- i) 400kV - 27 mtr or 24 mtrii) 220kV - 18 mtr or 16 mtr

i) 400kV : 27 metresii) 220kV : 17 metres


WORKS

Ch 24 : Fire Detection, Alarm &

Protection System

Page 15 of 70

24.4.5 24.4.5 Inert gas flooding system Please confirm whether Inert gas flooding system is required to be provided in 400kV GIS Hall or 220kV GIS Hall or Switchyard control building.

Inertgas flooding is not required for 400kV GIS Hall or 220kV GIS Hall or Switchyard control building

Date-02/02/2019

Page 32 of 34

Sl. No.

Volume No.Section/


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10 Amendment No. - 8Date-22.12.2018

Annexure-IIAnnexure-III

- 400kV GIS Switchyard220kV GIS Switchyard

Single Line Diagram

We understand that :-i) For ICT-3 Bay, GIS Scope is only uptoSF6-Air Bushing in both 400kV GIS & 220kV GIS and any GIB/Overhead conductor/ terminal clamps/AIS equipment like BPI,LA, CT,CVT & ICT-3 is not required to be supplied / erected in between - please confirm.ii) We understand that any foundation forC 3 i i d b d

i) Noted.. The SF6 to gas bushing shall be located 5 metres beyong (outside) the GIS building wall.

ii) Noted.


WORKS

CHAPTER – 29

400 kV GAS INSULATE

D SWITCHGE

ARPage 5 of71

29.02.05 xi) x) All related Mechanical items including Air conditioning system for Switchyard Control Room, Exhaust Ventilation & Under slung Crane for 400 kV GIS building, etc

Please confirm Tonnage capacity of Underslung / EOT Crane required to be provided for 400/220 kV GIS building.

EOT crane shall be suitable for lifting the largest/heavy components along with margins as specified in Volume III Mechanical


S-09Date-22/12/2018

G. GISSl. No. -3Page 11 of

18

Volume-IV - Electrical

CHAPTER – 29

400 kV GASINSULATEDSWITCHGEA

RPage 62 of 71

29.41.02 i)

Type Tests We understand that submission of valid reports of type tests conducted by parent company of GIS OEM having established GIS factory in India shall suffice. P lease confirm.

Owner's Response : Type test reports shall be valid only if the GIS has been manufacturedin India.

Bidder Query : Reply not clear - please clarify.

Owner's Response : Provision as per bid specification shall prevail.

We understand that type test reports can be submitted for 400/220kV GIS manufactured from any production facility of GIS OEM in the world and not necessarily only for the GIS manufactured in Indian Facility (if any) - please confirm.

Not acceptable. Follow tender specification


S-09Date-22/12/2018

G. GISSl. No. -2Page 11 of

185.16 400kV

GISSWITCHYA

RDSheet 35 of

40

Volume-II Generals &Schedules

Ch 4 :Provenness

The Bidder/Sub vendor should have designed, manufactured, erected, testedand commissioned one (1) Gas InsulatedSwitchgear (GIS) equipment(s) installationhaving at least six (6) bays of 400kV or above voltage class with short circuit current of not less than 40 kA for 1 second, which should have been in successful operation for minimum two (2) years prior to the date of Techno-Commercial bid opening.

Please confirm if GIS OEMs, who have recently established GIS manufacturing facility in India , but are yet to commission GIS bays suppliedfrom Indian Factory, can provide India factory made GIS for subject project , subject to their parent company / technical collaborator satisfying subject QR.

Owner's Response : Clause 5.15.2 (a) or 5.15.3 (a) of Volume IIhas to be mandatorily complied with.NOTE: ALL THE GIS BAYS SHALL BEMANUFACTURED IN INDIA ONLY.

Bidder Query : i) P lease kindly clarify - Is the “ MANUFACTURED IN INDIA ONLY” condition mandatory to all the GIS manufacturers, or only to the manufacturers who cannot meet Clause 5.15.1 of Volume II, Ch 4 : Provenness. P lease confirm.

Owner's Response : Provision

We understand that 400/220kV GIS manufactured from any production facility of GIS OEM in the world can be supplied for subject project (subject to meeting qualification requirement specified in Amendment No. – 12 Dated – 19.01.2019) and not necessarily GIS manufactured in India only - please confirm.

Entire GIS has to be supplied from Indian works only.The factory must have been in operation atleast one year before the Price Bid opening

Date-02/02/2019

Page 33 of 34

Sl. No.

Volume No.Section/


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PREBID CLARIFICATION

S-10Date-22/12/2018

F. ElectricalSl. No. -5Page 18 of

26Clarification

No.2(153 of 248)

Volume-II Generals &Schedules

Ch 4 :Provenness

5.15.135 of 40

The Bidder/Sub vendor should have designed, manufactured,erected, tested and commissioned one (1) Gas InsulatedSwitchgear (GIS) equipment(s) installation having at least six (6) bays of 400kV or above voltage class with short circuit current of not less than 40 kA for 1 second, which should have been in successful operation for minimum two (2) years prior to the date of Techno-Commercial bid opening.

GIS manufacturer supplies GIS bays and do supervision of Erection and commissioning of GIS at site. Hence, the referred clause need to be modified as below:"The Bidder/Sub vendor should have designed, manufactured, erected/ supervised erection, tested/supervised testing and commissioned/ supervised commissioning of one (1) Gas Insulated Switchgear (GIS)equipment(s) installation having at least six (6) bays of 400kV or above voltage class with short circuit current of not less than 40 kA for 1 second, which should have been in successful operation for minimum two (2) years. prior to the date of

Final Reply :- Clause 5.15.1 shall be read as:"The Bidder/Sub vendor should have designed, manufactured, erected/supervised erection, tested/ supervised testing and commissioned/ supervisedcommissioning ...... ,Other provisions as per bidding document shall prevail.

Amendment No. - 12

Date-19.01.2019

Sl. No. - 9Sheet - 5 of 8

5.16 5.16.1 The Bidder/Sub vendor should havedesigned, manufactured, erected, tested and commissioned one (1) Gas Insulated Switchgear (GIS) equipment(s) installation having at least six (6) bays of 400kV or above voltage class with short circuit current of not less than 40 kA for 1 second, which should have been in successful operation for minimum two (2) years

-

15 Addendum – 03Date-25/01/2019

Section-I, Invitation for

Bids (IFB),Page- 56 of

56, Vol-I

15Annexure-I

Annexure-II-Cl.-3.0 A - 4

viii -Electrical Works

GIS - Switchyard We understand that 400kV & 220kV GIS is not covered under "Minimum Local content" indicated in subject clause - please confirm.

As per Bid Specification.

14 Subject QR clauses are having discrepancy - please clarify.

The Bidder/Sub vendor should have designed, manufactured, erected/supervised erection, tested/ supervised testing and commissioned/ supervised commissioning...... ,

Date-02/02/2019

Page 34 of 34

Documents

Date-02/02/2019Steam Turbine and its Auxiliaries 52 of 70 7.2 Prebid Clarifications - 4 S. no. 65 Emergency point Two turbine driven feed pumps to be capable of generating the discharge