Amendment II Clause No. Page No. Original Clause Revised ... · commissioning of 11 KV ... Clause...

Amendment II Renovation, Modernization & Upgradation of 3x10MW Kulhal Power House UJVN Limited, Dehradun NIB No.: RMU (YV)/2010-11/01 DATED 25/03/2011

Sl No.

Clause No. Page No. Original Clause Revised Clause

Technical Part

1 Volume 2.2, Part 2, Section 2, Chapter 3, Clause 3.2- Optional

page 3-1 Optional : Three (3) sets of neutral earthing transformers and loading resistors.

Deleted

2 Volume 3.2, Part 1-PS Section 2- Electrical Equipment,Schedule 2-3: Generator Termination Equipment

4 of 95

3.11 Neutral earthing transformers with loading resistor 3 set

3 Volume 3.2, Part 1-PS Section 2- Electrical Equipment,Schedule 2-3A: Generator Termination Equipment-Optional Items

Page 15 of 95

Neutral earthing transformers with loading resistor 3 set.

Deleted

4 Volume 2.2, Part 2, Section 2, Chapter 3, Clause 3.4.8

page 3-3 Alternative: The possibility to operating the generator neutral isolated shall be verified. It is noted, that the generating units at DHAKRANI and DHALIPUR HEP are operating with isolated neutral points.

Deleted

5 Volume 2.2, Part 2, Section 2, Chapter 5, Clause 5.3.1 Intent of Specification

page 5-1 Old PTs are being replaced to meet the accuracy requirement for metering core which shall be 0.2S.

Old PTs are being replaced to meet the accuracy requirement for metering core which shall be 0.2.

6 Volume 2.2, Part 2, Section 2, Chapter 5, Table 5.1, Item 18, column 3

page 5-6 0.2S 0.2

7 Volume 2.2, Part 2, Section 2, Chapter 8, Clause 8.2 Scope of work, first bullet

page 8-1 Design, engineering, manufacture, assembly, testing at works of manufacture, supply, receipt at site, site storage, erection, testing and commissioning of 11 KV switchgear panels with SF6 or vacuum type circuit breakers, consisting of following feeders..

Design, engineering, manufacture, assembly, testing at works of manufacture, supply, receipt at site, site storage, erection, testing and commissioning of 11 KV switchgear panels with SF6 type circuit breakers, consisting of following feeders..

8 Volume 2.2, Part 2, Section 2, Chapter 8, Table 8.1, B Circuit Breaker, Item 3, column 4

page 8-14 SF6 gas or vacuum SF6 gas

9 Volume 3.2, Part 1-PS Section 2- Electrical Equipment item 1.30.13 Schedule 2-1B,Generators –Special Spare Parts

Page 8 of 95

Damper buses Damper bars

Renovation, Modernization & Upgradation of 3x10MW Kulhal Power House UJVN Limited, Dehradun NIB No.: RMU (YV)/2010-11/01 DATED 25/03/2011 Reply to Pre-Bid Queries(Technical) -EPS

Sr. No.

Reference clause/Clause Heading

As given in Bid Document

Pre-bid Queries/Modification required.

Reply of UJVN Limited

1 Documents and drawings

- Please furnish all tender documents in editable form, which shall be filled by us during bid preparation i.e. Data sheets and other schedules.

Section 6 of Volume -1 and Volume -3 has been provided.

CHAPTER 3: GENERATOR TERMINATION EQUIPMENT

1 Volume 2.2, Part 2, Section 2, Chapter 3, Clause 3.2- Optional

Three (3) sets of neutral earthing transformers and loading resistors.

The existing earthing transformer is oil filled and of vintage design, hence we recommend that the same should be replaced with cast resign dry type earthing transformer. Please confirm. As the other associated components shall be replaced, this shall cause to change in the loading register value, hence it is recommended to change the loading register.Please confirm.

Generator neutral cubicles shall be refurbished as scope given under clause 3.4.8 of Vol 2.2, Part 2, Section 2, Chapter 3 Please refer Amendment II.


After complete dismantling of the equipment the cubicles shall be refurbished; the sheet steel doors shall be fitted with inspection windows.

The present configuration shall be maintained. The necessary modification if required shall be done as per the approved drawings. Please confirm.

Agreed.

3 Volume 2.2, Part 2, The generator neutral With reference to the clause 3.2, the Same as above at point no.1

Section 2, Chapter 3, Clause 3.4.8

cubicles shall be refurbished and fitted with the following new equipment: _ Single phase, dry type cast resin earthing transformer; -Loading resistor; Current transformers; _ Bus bar and insulator systems. Alternative: The possibility to operating the generator neutral isolated shall be verified.

given items shall be the main scope of supply. Kindly confirm. The requirement of the operating of the generator with Isolating neutral needs to be confirmed. The isolating of the neutral shall be done manually. Please confirm.

Please refer Amendment II.


Equipment Tests (1) Type tests The type tests shall have been performed and recorded in compliance with the related Standards. The relevant TT certificates shall be submitted to prove the protection class, the thermal and short- circuit capability.

Please confirm that the complete panel of Generator terminals shall not be replaced, hence production of the type test report against the IP class & thermal and short circuit capability are not applicable. However the type test report as per the applicable standards (IS) shall be furnished for review during details engineering. Additional type/special test shall be conducted on chargeable basis. Please confirm.

All related, relevant and required type test as per applicable standard shall be performed and recorded. Referred clause shall remain as it is in bid document.

CHAPTER 4: MAIN STEP-UP TRANSFORMERS

1 Volume 2.2, Part 2, Section 2, Chapter 4, Clause 4.2 SCOPE OF WORK

Kindly confirm that the scope shall be limited to the replacement of the MK boxes of MTs only, having the controls & equipment in line with the given specification.

Yes, however scope of work shall also include the transportation of old dismantled items to site stores

2 Volume 2.2, Part 2, Section 2, Chapter 4, Clause 4.3.1 New Marshalling Kiosks

Some of the instruments have recently been replaced with new Instruments and all such instruments shall be used in the new marshalling kiosks without any provision of the new instruments.

We understood that the duly complete MK boxes shall be supplied; hence the recently replaced component of the existing MK boxes shall not be used. The same can be kept as a spare for future use by UJVNL. Please confirm

Referred clause shall remain as it is in bid document.

3 Volume 2.2, Part 2, Section 2, Chapter 4, Clause 4.3.3 Internal Wiring.

Multi core stranded copper cable of PVC insulated and FRLS type of 2.5 mm2 cross sectional area shall be used for control circuits.

The cables for IOs signals shall be FRLS stranded copper cable of 1.5 mm2 cross sectional area as per prevailing standards practice. However the power cables sizes shall be as per the sizing calculations performed during details engineering. Please confirm.


CHAPTER 5: HV SWITCHYARD 132 KV


Local control boards (LCB) with ACS interface for all circuit

The local control boards of the supply shall be limited up to only the newly supplied Isolators. No any civil work is


breakers and isolators.

considered under this package. Kindly confirm.


Old PTs are being replaced to meet the accuracy requirement for metering core which shall be 0.2S.

Please note that the accuracy class 0.2S is not applicable for the PT. The same shall be 0.2. Kindly confirm.

Old PTs are being replaced to meet the accuracy requirement for metering core which shall be 0.2. Please refer Amendment II.


The existing PT marshalling box shall be used. The supply of new PT marshalling box is not envisaged. Please confirm.

The existing PT marshalling box shall be used.

4 Volume 2.2, Part 2, Section 2, Chapter 5, Clause 5.3.3 Design Criteria 7) Terminal Box.

The terminal box shall be made of 3 mm sheet steel and have IP- 55 degree of protection.

The terminal box sheet thickness shall be as per the manufacturer standards. Please confirm.


5 Volume 2.2, Part 2, Section 2, Chapter 5, Clause 5.4.1 Features of Existing 132 kV Isolators

Isolators Operating mechanism – Pneumatic

Please note that the same shall be Motor operated + Manual operated. Please confirm.

For Isolators Operating mechanism please refer clause 5.47 of Volume 2.2, Part 2, Section 2, Chapter 4,

6 Volume 2.2, Part 2, Section 2, Chapter 5, Clause 5.3.4 Tests & 5.4.28 Tests

Type & Special Test The type test report of similar product as per the applicable standards (IS) shall be furnished for review during details

Name of type and special test are clearly mentioned in the scope, bidder should offer accordingly.

engineering. Additional type/special test shall be conducted on chargeable basis. Please confirm.

CHAPTER 8: MV SWITCHGEAR 11 KV

1 Volume 2.2, Part 2, Section 2, Chapter 8, Clause 8.2 Scope of Work.

The location of the 11kV switchgear room is not clear, kindly provide the details. The suitable size room construction for the installation of the 11kV switchgear panels are not considered under this package. Please confirm.

Existing Structure shall be utilized.

2 Volume 2.2, Part 2, Section 2, Chapter 8, Clause 8.5.3 Circuit Breakers

The circuit breaker shall be of SF6 type.

Kindly confirm that the CB shall be SF6 or Vacuum type.

CB shall be of SF6 type Please refer Amendment II.

3 Volume 2.2, Part 2, Section 2, Chapter 8, Clause 8.5.6 Auxiliary Switches

Control switches shall be rotary, multi-position, cam-operated, multi-stage type with dust cover and silver-to-silver contacts rated 600 V and 20 A. Breaker control switches and selector

The reputed make 11kV breaker panels shall be supplied. The control switches type & orientation shall be as per the manufacturer standards. Please confirm.


switches shall have “pistol grip” handles. All Meter switches shall have “knurled knob” handles. Lockout switches shall have “oval” handles.

4 Volume 2.2, Part 2, Section 2, Chapter 8, Clause.5.9 Protection Relays

One number of handheld Programming unit shall be supplied.

The requirement is not clear, Kindly explain.

To be explored by the bidder.

5 Volume 2.2, Part 2, Section 2, Chapter 8, Clause TABLE 8.1

Rated short time withstand current for 3 s (at nominal system voltage)

We understand short circuit duration of 11 kV Switchgear panels is for 1 sec. Kindly confirm.


Volume 2.2, Part 2, Section 2, Chapter 8, Clause TABLE 8.1

B Circuit Breaker Current rating A 800

11kV Switchgear rating shall be 630A as per manufacturer's standard. As the 630A rating switchgear meets the plant technical & functional requirement.Please confirm


CHAPTER 9: MV/LV AUXILIARY TRANSFORMERS


No any civil work is considered under this package. Kindly confirm.


2 Volume 2.2, Part 2, Section 2, Chapter 9, Clause 9.4.1 General

The design shall be based on site and service conditions as specified. An ambient Temperature of 50oC shall be considered.

The transformer shall be designed for an ambient temperature of 400C. Kindly confirm


3 Volume 2.2, Part 2, Section 2, Chapter 9, Clause 9.6 WORKSHOP TESTS

(2) Type Tests The type test report of similar product as per the applicable standards (IS) shall be furnished for review during details engineering. Additional type/special test shall be conducted on chargeable basis. Please confirm.


CHAPTER 11: EMERGENCY DIESEL GENERATING UNITS


No any civil work is considered under this package.Kindly confirm

Referred clause shall remain as it is in bid document

2 Volume 2.2, Part 2, Section 2, Chapter 11, Clause 11.2 DESIGN CRITERIA

5) The DG unit rating shall be such, that one DG unit is capable of supplying the essential Consumers of the entire plant as detailed below.

As per the given consumer list the required capacity of the DG shall be more than 250 KVA. However the same can be managed with sequential operation of the loads (part of details engineering). Presently the 250KVA DG sets have


been considered as a part of scope of supply. Kindly confirm.

3 Volume 2.2, Part 2, Section 2, Chapter 11, Clause 11.4.2 Starting System

Two sets of batteries of the Lead Acid type with a total capacity sufficient to maintain cranking speed through a 4 minute cycle of 15 s crank followed by 15 s rest for 6 consecutive cycles shall be provided.

The one set of suitable capacity starting batteries shall be provided for each DG set. The cranking sequences & time shall be finalized during detail engineering in line with the best practices. Kindly confirm.


4 Volume 2.2, Part 2, Section 2, Chapter 11, Clause11.12.4 Bridge Crane

The crane shall consist of a bridge, crane travel and lifting mechanism. The lifting and crane travel mechanism shall be electrically driven.

The manual operated mono rail (crane) shall be sufficient for easy handing of the complete DG set, Hence electrically operated lifting crane is not required. Kindly confirm.


CHAPTER 12: DC AUXILIARY SUPPLY & UPS SYSTEMS


(1) ASAN Barrage One (1) UPS system, 48 V DC/240 V AC 50 Hz, 10

The rating of the UPS (10KVA) looks to be very high. Kindly review & confirm. The UPS DC supply shall be taken

The rating of UPS shall be 10KVA. Yes, UPS DC supply shall be taken from the 48V,

kVA approx.;

from the 48V, 200Ah battery bank provided at ASAN barrage. Kindly confirm.

200Ah battery bank provided at ASAN barrage.

CHAPTER 15: MV, LV AND CONTROL CABLE SYSTEMS

1 Volume 2.2, Part 2, Section 2, Chapter 15, Clause 15.5 CONTROL CABLES

KULHAL Power House 2) 6 mm2 (For CT and PT circuits)

The CT/PT circuit cables sizes (6 mm2 or 4 mm2) shall be inline with the CT/PT sizing (burden, Knee point voltage) calculations furnished during detail engineering. Kindly confirm.


2 Volume 2.2, Part 2, TABLE-15.3 Ratings and requirements of LV cables

Impulse withstand voltage for LT cables 7.2 kV for five minutes between conductors and between conductor and ECC.

Not applicable of LT cables. Kindly confirm.


3 Volume 3.2, Part 1 – PS, Section 2, Chapter 15: MV, LV and Control Cable Systems

Item (a), (b), (c) & (d).

The 6.6KV & 11kV HV cable sizes mentioned shall not be suitable for short circuit current rating for one sec. Please check and confirm


CHAPTER 16: EARTHING AND LIGHTNING PROTECTION SYSTEMS


1. Design, engineering of subsurface earthing grid of switchyard and transformer

1. The existing embedded grounding system for the switchyard, power house & ASAN barrage can not be refurbished & replace, as the same is in accessible. The calculation of the


yard, ASAN barrage, determination of safe touch and step potentials and supply of subsurface earthing grid conductors and accessories, receipt of the materials at site, erection, testing and commissioning of the subsurface earthing grid for the ASAN barrage, and 132 kV switchyard and transformer yard at power house. 2. Design, engineering of subsurface earthing grid for digital equipment and supply of subsurface earthing grid conductors and accessories, receipt of the materials at site, erection, testing and commissioning of the subsurface earthing grid for Kulhal Power house.

safe touch & step potential at afore said area is practically not possible. The scope shall be the renovation of the existing earth pit and other associated earthing points. Kindly review & confirm the same. 2. The separate grounding system for the digital equipment shall be provided based on the requirement of the digital equipment manufacturer. Kindly confirm.


2 Volume 2.2, Part 2, Section 2, Chapter 16, Clause 16.5 SPECIFIC REQUIREMENTS

The resistance of the subsurface earthing grid shall be one (1) E or less. Necessary steps shall be taken to bring the resistance within this limit if design or measured values are higher.

The resistance of the sub-surface grounding system can not be much varies with reference to the existing resistance. If the requirement is to be met, then the additional subsurface grounding system needs to be installed at other location in addition to the existing one and both shall be connected together. Kindly review & confirm.


CHAPTER 17: FIRE PROTECTION SYSTEMS


The construction & supply of the static over head tank & tank filling pumps along with necessary switchgear are not considered under this package. Kindly confirm.

Please refer Vol 3.1/part-1- PS, Section 1- Civil works pg 13 -15 and Vol 3.2/part-1- PS, Section 2- Electrical Equipment Schedule 2-17

2 Volume 2.2, Part 2, Section 2, Chapter 17, Clause 17.3.4 Specific Requirement

d) Pipe Network A multi ring pipe network made of hot dipped galvanized steel pipes complete with pipes and fittings shall be erected around the transformers as required

The pipes shall be MS ERW as per IS 1239 painted with RED color in line with the standard practice. Kindly confirm


for installation of projectors and nozzles.

Generator

1 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.1, pg 1-1 Main features of existing equipment

Permissible overload – 10% continuous

The continuous overloading of 10% is not defined in Turbine. Hence we would like to confirm that whether the existing generators & turbine are already designed with 10% continuous overloading or the machines are going for up-rating by10%. If, machines are going for up-rating by10% then please ensure that the existing foundation is also capable for forces due to this up-rated power.

Please refer Volume 2.2, Part 2, PTS, Section1-Mechanical Equipment, Chapter 1,Clause 1.4.14(5)& 1.4.14(6), pg 1-18 and Volume 2.2, Part 2, PTS, Section2-Electrical Equipment, Chapter 1,Clause 1.4.2, pg 1-4

2 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.2, Sr.No 3, pg 1-2 Scope of Work

Unit-B: Refurbishment of stator core & winding

Please confirm the scope of work for refurbishment of stator core & stator winding for Unit-B in case the ELCID test results are satisfactory. But please ensure that in this case the inter-changeability of stator winding between Unit –B and Unit-A & C (supplied new) will not be possible.

Referred clause shall remain as it is in bid document. Please refer Volume 2.2, Part 2, PTS, Section2-Electrical Equipment, Chapter 0,Clause 0.2, pg 0-1

3 3. Volume 2.2, Part 2, PTS, Chapter 1,Clause

Refurbishment of Hub. We understand that rotor hub is an interface part between


1.2, Sr.No 4, pg 1-2 Scope of Work

bearing (thrust collar) & rotor spider. We understand that refurbishment of hub includes machining at bearing journal and thrust pad seating phase. Please confirm.

4 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.6, Sr.No 3, pg 1-7 Rotor

Refurbishment of all rotor parts including the brake ring.

Please let us know the scope of work in detail for refurbishment of rotor components like rotor spider, fans & rim laminations. The brake-ring is an integral part of rotor spider hence refurbishment is not possible. Please confirm .

Referred clause shall remain as it is in bid document. Please refer Volume 2.2, Part 2, PTS, Section2-Electrical Equipment, Chapter 0,Clause 0.2, pg 0-1

5 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.7, Sr.No 2, pg 1-7 Shaft, Coupling, Alignment

Refurbishment of shaft and coupling

Please confirm the scope of work for refurbishment of shaft and coupling.

Please refer Volume 2.2, Part 2, PTS, Section2-Electrical Equipment, Chapter 0,Clause 0.2, pg 0-1

6 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.8, Sr.No 1, pg 1-7 Poles and Field Winding

The pole shall be completely dismantled and the pole bodies tested and refurbished.

We understand that refurbishment of pole body includes replacement of insulation between pole body and pole coil. Please confirm.

Yes,

7 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.8, Sr.No 7, pg 1-7 Poles and Field

Connections between field coils and all field leads to the slip-rings.

Please confirm that all connections between field coils and all field leads have to be replaced.

Yes,

Winding

8 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.9, Sr.No 2, pg 1-8 Sliprings, Brushgear and Slipring compartment

The Sliprings shall be made of stainless steel and shall have helical grooved surface.

Normally, for slip-rings the Carbon Steel material is considered. Please give your confirmation for acceptance of same.


9 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.10, Sr.No 5, pg 1-8 Bearing and Bearing Brackets

Material test on bearing brackets

We can perform the UT or magnetic particle test to ensure the healthiness of the brackets.

All the material test which are required to know the condition of Bearing bracket shall be required to be performed.

10 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.11, pg 1-9 Generator Cooling System

Tubes, tube plates – Stainless steel

Please confirm that for cooler tubes of Cu-Ni: 90:10 material and Carbon steel for tube plates are also acceptable.


11 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.10, Sr.No 1, pg 1-8 & Clause 1.4.11, Sr.No 2, pg 1-8 Bearings and Brg. Brackets & Generator Cooling System

Refurbishment of pipings & fittings of generator bearings & cooling system

As per the tender specifications, we have to replace the existing instrumentation in Generator bearings & cooling system. The new instrumentation may not fix in the existing oil & water pipings and hence we recommend to replace the complete oil & water pipings. Please confirm. Also confirm that Carbon Steel material is also acceptable for all water pipings and oil pipings.


12 Volume 2.2, Part 2, Each unit shall be We understand that the will be in Yes,

PTS, Chapter 1,Clause 1.4.12, pg 1-9 Brake and Jacking System

equipped with an air receiver complete with pressure gauges, piping and fittings.

scope of supply. Please confirm.

13 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.4.12, Sr. No 5, pg 1- 10 Brake and Jacking System

Brake dust collecting and exhaust systems shall be installed to prevent brake dust entering the generator.

Mounting of brake dust collector is not possible on existing brake cylinders due to its construction. Hence we are recommended to replace complete brake & jack system. Please confirm.


14 Volume 2.2, Part 2, PTS, Chapter 1,Clause 1.5.2, pg 1-13 Special Spare Parts

Special Spare Parts • Stator coils/bars complete with accessories – 30% of complete set

Normally the spare coils/bars should have inter-changeability means it could be utilised in all the machines. But if the ELCID test results are satisfactory then there will not be replacement of stator core & winding for Unit-B as defined in tender specification and hence the spare stator coils/bars will not be utilised for Unit-B. Please check.



Special Spare Parts • Pole assembled with windings – 3 pcs

We understand that the spare pole bodies (3 pcs) will be provided by UJVNL and we have to mount new pole windings on

No, this is new supply.

spare pole bodies. Please confirm.


Special Spare Parts • Thrust/guide bearing pads – 1 set

We understand that 1 set of spare thrust & guide pads will be provided by UJVNL and we have to re-babbitting/ re-lining the pads. Please confirm.



Special Spare Parts • Air-water heat exchangers – 2 pcs • Oil/water heat exchangers – 1 pc

We understand that 2 pcs of spare air-water coolers and 1 pc of spare oil/water cooler will be provided by UJVNL and we have to refurbish same. Please confirm.



Special Spare Parts • Damper buses – 10% of a complete set

We understand that damper buses mean connections between damper segments. Please confirm

There is a typographical error. Revised clause is: Special Spare Parts • Damper bars – 10% of a complete set Please refer Amendment II.

BOP

1 2.2 / PTS_04 / 4.1.1 (2) & 4.4.3 ,Compressed Air System

Delivery pressure of service air system is 15.5 bar while in clause 4.4.3, Please clarify.

design pressure of service air system shall be 8 bar as mentioned in said clause

2 2.2 / PTS_06/ 6.1, 6.4.2 (4) ,Cooling Water

CWS serves the HP air compressor but in drawing 360067 CW 4000 R 610,

Cooling water for HP air compressor is not required.

System

there is no any taping shown for HP air compressor. Please clarify.

3 HVAC, 2.2 / PTS_18/ 18.2

It is mentioned that Two (2) explosion proof exhaust fans (size 24”, 4,600 m3 /h) for the battery room at the ASAN barrage will be scope of work. Please confirm whether there is any battery room at ASAN barrage.

Existing Structure at Asan barrage shall be utilized.

4 Mechanical & Hydromechanical Equipment, 2.2/GTS_05/5.1.2.1

“Steel pipes of a diameter <150 mm shall be of stainless steel. Steel pipes larger than150 mm in diameter shall be made of galvanised carbon steel”. “Considering the kind and chemical properties of the transported media, pressure pipes of diameters smaller than 80 mm shall be of stainless steel, except for non-pressurised piping”. Both statements are contradictory. Please clarify.


Hydraulic Steel Structure:

Sr. No.

Reference clause/Clause Heading

As given in Bid Document

Pre-bid Queries/Modification required.

Reply of UJVN Limited

1 Vol. 2.1, part 2-PTS, Section 2.0 (Hydraulic steel structure) Chapter 01&03&6

Cl.1.2.2 and Cl.3.2.2 and Cl.6.2.2

Please provide the existing hoist capacity & weight for lifting of head regulator gate, barrage gate and emergency intake gate. To have an idea for design and lifting of temporary gate.

Bidders may visit the site for collection and confirmation of data

2 Vol. 2.1, part 2, Section 2.0 (Hydraulic steel structure) Chapter 0 (General requirement)

Cl.0.12.5 –Painting Schedule (embedded parts in contact with concrete)

The painting on embedded part in contact with concrete;the painting on existing embedded parts in contact with concrete is not able to do paint, as it is already embedded. Please confirm. Or applicable for new component.

Query is not clear.

3 Vol. 2.1, part 2, Section 2.0 (Hydraulic steel structure) Chapter 2. 0 Head Regulator Trash rack & cleaning machine

Cl.2.3.2 Trash rack cleaning machine-please provide hopper capacity


4 Vol. 2.1, part 2, Section 2.0 (Hydraulic steel structure) Chapter 5.0 Intake Trash rack & cleaning machine

Cl.5.3.2 Trash rack cleaning machine-please provide hopper capacity


5 Vol. 2.1, part 2, Section 2.0 (Hydraulic steel structure) Chapter 5.0 Intake Trash rack &

Cl.5.2 The remedial works to be carried out for trash rack as per scope of work, but for the submerge portion of trash rack kindly elaborate the exact

The query is not clear.

cleaning machine condition.

6 Vol. 2.1, part 2, Section 2.0 (Hydraulic steel structure) Chapter 5.0 Intake Trash rack & cleaning machine and vol. 3.1, part-1.0 - price schedule, section 2.0 (Hydraulic steel structure), Schedule -2-5 and 2.5 A Intake trash rack

Cl.5.2 (Scope of work) &price schedule 2-5 and 2-5A

As per scope of work Cl . 5.2, the remedial works to be carried out for trash rack as per scope of work. But we did not find place in price schedule to accommodate this price in schedule-2-5 or optional items such, 2-5A,Kindly clarify, whether rectification is to be considered or not.

Rectification and/or replacement of trash rack may be offered as an optional items.

7 Vol. 2.1, part 2.0, Section 2.0 (Hydraulic steel structure), Chapter 2.0 Head Regulator Trash rack & cleaning machine

Cl.2.3.1 As per our site visit, the trash rack is badly damaged for head regulator,rectification and painting works is to be done but how to do rectification of trash rack in position if reservoir is fully of water, is there any planning to empty reservoir.

Please refer the complete bid document. This has been addressed in the document.

8 Vol. 2.1, part 2.0, Section 2.0 (Hydraulic steel structure), Chapter 2.0 Head Regulator Trash rack & cleaning machine and vol. 3.1, part-1.0 - Price Schedule, Section 2.0 (Hydraulic steel structure), Schedule -2-2 and 2.2 A Head Regulator Trash rack

Cl.2.2 (Scope of work) &price schedule 2-2 and 2-2A

As per our site visit and scope of work Cl.2.2, the trash rack is badly damaged for head regulator,Rectification or replacement is necessary to suit the trash rack cleaning machine. But we did not find place in price schedule to accommodate this price in schedule-2-5 or optional items such, 2-2A,Kindly clarify, whether rectification is to be considered or not.

Rectification and/or replacement of trash rack may be offered as an optional items.

9 Vol. 3.1 part-1.0 – Price Schedule,Section

Chapter-1(Barrage gate) item no.1.1A to 1.6A

In the price schedule, the items mentioned (cast iron track, site seal

The bidder has to ensure successful commissioning

2.0 (Hydraulic steel structure), Schedule -2-1A Barrage gate –Optional items

track, sill beam etc.) is only for the supply to be considered or price with completely replacement of parts along with grouting.

and operation of equipment and shall offer price accordingly in optional items.

10 Vol. 3.1 part-1.0 – Price Schedule,Section 2.0 (Hydraulic steel structure), Schedule -2-3A Head regulator gate –Optional items

Chapter-3(Head Regulator gate) item no.3.1A to 3.2A

In the price schedule, the items mentioned (cast iron track, site seal track, sill beam etc.) is only for the supply to be considered or price with completely replacement of parts along with grouting.

The bidder has to ensure successful commissioning and operation of equipment and shall offer price accordingly in optional items.

11 Vol. 3.1 part-1.0 – Price Schedule, Section 2.0 (Hydraulic steel structure), Schedule -2-4A Silt ejector gates –Optional items

Chapter-4( Silt ejector gate ) item no.4.1A to 4.2A

In the price schedule, the items mentioned (site seal track, sill beam etc.) is only for the supply to be considered or price with completely replacement of parts along with grouting.

The bidder has to ensure successful commissioning and operation of equipment and shall offer price accordingly in optional items.

12 Vol. 2.1, part- 2, Section 2.0 (Hydraulic steel structure) Chapter 6.0 Intake Emergency gate and vol. 3.1, part-1.0 - Price Schedule, Section 2.0 (Hydraulic steel structure), Schedule -2-5 Intake Emergency Gate

Cl.6.2 & price schedule 2-6

While visiting site, the rectification and rehabilitation of intake emergency gate is going on, replacement of rubber seal, painting, overhauling of lifting beam etc. is being done by local contractor.Kindly Clarify the scope of work for intake emergency gate.


General comments -Generator

1 Please provide the value of short circuit ratio of the generator

Replied earlier.

2 Please confirm that asbestos material is not used in any of the power house equipment.

Query is not clear

3 Please provide stator lamination drawing, stator coil drawing and winding diagram

Drawings have already been provided

4 Please provide detail drawing of pole windings and pole body


5 Please provide detail drawing of rim laminations


6 We recommend replacing oil cooler of lower combined bearing instead of its refurbishment. Please confirm.


Turbine –Hydraulic information

1 The observed forebay maximum level during our site visit was 399.273 m wheras in tender it is given as 400.5 m. Kindly confirm the maximum and minimum forebay operating level

Operating level: 399.35 Max. Head water level (forebay) :400.5 m Minimum HWL EL 393 m

2 Kindly confirm the scope of ultrasonic flowmeter required.

Please refer Volume 2.1, Part 2, PTS, Section2-HSS Chapter 9,Clause 9.3.2,

3 The observed maximum tailwater level when all machines running at full load is 379.84 m whereas in documents for the design discharge of 200 cumecs TWL is 382.2 m. kindly confirm minimum tailwater level(One machine running)and maximum tail water level (all units are running).

Please refer Volume 2.2, Part 2, PTS Section 1, Mechanical Equipment Chapter 1, clause1.1.1(4) pg1-2

Amendment II Clause No. Page No. Original Clause Revised ... · commissioning of 11 KV ... Clause...

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