RESPONSE TO TECHNICAL QUERIES FOR THE WORK · PDF file · 2017-02-04Sl No Tender Specification Reference Clause No. & Page No. Description As per RFP Query By Bidder OCPL's Response

Sl No Tender Specification Reference Clause No. & Page No. Description As per RFP Query By Bidder OCPL's Response

The battery limit of area grading & levelling is not mentioned in the drawing no. 13L16-DWG-C-CHP-AG-001, Rev-2.

Bidder request Client to mention the battery limit of area grading and levelling in the drawing no. 13L16-DWG-C-CHP-AG-001, Rev-2.

Bidder request Client to provide the layout of following non plant buildings:

a)CHP Maintenance Workshop

b)Two Wheeler & Car Parking shed

c)Ware House

d)DG Building.

3 General General Corrosion Prevension Any kind of corrosion inhibitor admixture in the concrete is not envisaged. Please confirm.

Bidder to decide as per the relevant IS Code.

4 General General Corrosion Prevension Only HYSD Fe500 grade R/F Steel is considered. Neither corrosion resistant R/F Steel nor corrosion protection to R/F steel is envisaged in NIT specification hence not considered in the scope of work. Please confirm.

Corrosion resistance coating on reinforcement is not recommended.

5 General General Railway Line Connectivity Any kind of approvals from the railway authorities for the construction Rail Loading Silo is not in the Bidder’s scope. Please Confirm.

Not in bidder's scope

Any kind of railway siding works and signalling works is excluded from the Bidder’s scope of work.

Please Confirm.

Soil Investigation Report is not provided in NIT document.

Bidder request Client to furnish the Soil Investigation Report (including bore log details) to be followed for the proposed CHP package.

Bidder request Client to furnish the construction specification of the Boundary wall.

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8 General General

General General

General General

General General

General General

Interfacing of RLS in the scope of bidder.6

Revised Drawings no 13L16-DWG-C-CHP-AG-001, Rev-3 showing the FGL at various locations of CHP along with contour map is provided. Drawing No. 13L16-DWG-C-CHP-AG-001, Rev-2 here after stands cancelled.

Tentative sizes for CHP maintenance Shop, Store shed & office building(Weare house) and DG building have been furnished in Technical specification under Volume-II C1/S-I, Clause no: 3.00.00 and in CHP Plot plan Drawing. For car and two wheeler parking please refer Volume II-C1/S-4, Clause No. 3.01.17 g.

RESPONSE TO TECHNICAL QUERIES FOR THE WORK ENGINEERING, PROCUREMENT AND CONSTRUCTION OF 8MTPA CAPACITY (4000TPH) COAL HANDLING PLANT (CHP) AT MANOHARPUR COAL MINES

Area Grading & Levelling

Layout of Non Plant Buildings

Railway Line Connectivity

Soil Condition

Scope of Civil Works : Boundary Wall

Priliminary Soil Investigation Report will be provided. However, bidder will take up its own soil insvestigation before start of work.

RCC framed structure boundry wall with fly ash brick in between. Height of boundry wall will be 1600 mm. Concertina wire shall be provided on top of the boundary wall. The extent of boundary wall shall be as shown in the revised plot plan. Barbed wire fencing shall be provided around all the substations and bulb area.

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Also bidder request Client to provide the layout of Boundary wall in the Plot Plant Drawing no.

Bidder request Client to Clarify whether the scope of construction of Culvert / Bridge for road crossing over Garia nala is to be considered in Bidder’s scope.

Please Confirm.

1) Bidder request Client to confirm the width of Garia Nala.

Approximate 30 mtrs. However, bidder needs to visit the site and access the actual width

2) Please confirm whether the Conveyor trestles can be located inside the Nala Basin.

NO

Please confirm

11 General General Approach Road up to ramp of Receiving Pit. Please Confirm whether the approach road up to ramp of Receiving Pit is to be considered in the Bidder’s scope.

Yes. It is Confirmed that approach road up to ramp of Receiving Pit is to be considered in the Bidder’s scope .

12 V.IIB/S-I-DS : 34, DATA SHEET 12, FOR IDLERS

DATA SHEET 12, page 34 As per data sheet, rolls manufactured from heavy grade IS 9295 with 6.3 mm thk, however, As per 4.03.02:The rollers‟ dia shall be as specified in Data Sheet with heavy duty seamless steel tube having minimum thickness of 6.3mmAs per data sheet:

IS 9295 is spec for ERW pipe (having 6.3 mm thk) instead of seamless tube as specified in the spec. We understand that ERW pipe roll as per IS 9295 shall be considered. Please clarify

Tubes shall be heavy duty seamless as per IS:9295.

13 V.IIB/S-I-DS : 35DATA SHEET 12, NOTE 1

DATA SHEET 12, page 35 Impact pad (UHMW-PE) shall be provided for all loading zone of all conveyors as far as possible.

PL consider impact idlers for impact table of padle feeder.

Accepted.

14 V.IIB/S-I : 184.08.00 CST DRIVES

4.08.01, page 18 Conveyor drives of 200kW and above should have Controlled Start Transmission (CST) drive.

PL propose to consider scoop type fluid coupling also due to limited availability of CST drive & provenness of fluid coupling

Bidder's proposal is accepted.

15 V.IIB/S-V : 12.00.00 SCOPE OF WORK

2.01.00 Scope of Work Fire Protection & Detection System:Fire Protection & Detection System has been considered for complete Mine End CHP along with its infrastructure areas for fire prevention and safety requirements.

AS per technical specification Fire Protection & detection Systems are not considered for Coal stcok yard C1, Mine substation, Pit head dumper & dozer parking yard.

Fire Protection needs to be provided in all areas of CHP as per the latest guidelines applicable to Coal Mines


2.01.00 Scope of Work It is envisaged that fire water pump house shall contain motor driven main fire pumps (1W+1S) backed up by a diesel engine driven emergency pump

As per pumping requirement, 2 nos. Motor driven & 1 no. diesel engine driven i.e (2W+1S) are proposed. Hence water requirement for each zone of conveyor will be (273+273)/3= 182 M³/Hr. Please confirm.

Owner's Techincal Specification shall prevail


2.01.00 Scope of Work 220kV Switchyard & Main substation (fire hydrant line is to be terminated with in 10m from the sub-station, rest work by sub-station package bidder)

Location of 220kV Switchyard not shown in plot plan. Please clarify.

There is no provision for 220 kV Switchyard / Main power supplying sub station is not in bidder's scope. But we have 33 KV Switchyard.33Kv switch yard is not in bidder's scope and Fire hydrant is not required in this 33 KV switch yard

8 General General

9 General General

10 General General

Scope of Civil Works : Boundary Wall

Scope of Civil Works : Culvert Over Garia Nala

Trestles over Garia Nala

RCC framed structure boundry wall with fly ash brick in between. Height of boundry wall will be 1600 mm. Concertina wire shall be provided on top of the boundary wall. The extent of boundary wall shall be as shown in the revised plot plan. Barbed wire fencing shall be provided around all the substations and bulb area.

Yes, it is in bidder's scope.


2.01.00 Scope of Work Workshop terminal area Location of Workshop terminal area not indicated in Plot Plan. Please clarify.

Refer revised plot plan which is enclosed.


2.01.00 Scope of Work Transfer Housei) Pressurized Hydrant System ii) Sprinkler/MVW Spray System iii) Automatic Fire Detection & Alarm System iv) Portable Fire Extinguishers

Please clarify the type of detection system to be provided for Transfer house i.e with QB detection system or fire detectors.

Solar blind infrared emberdetectors and LHS cable to be used as fire detectors for Transfer house.

20 V.IIB/S-V : 52.02.00 Scope of supply

2.02.06 Required number of water monitors, complete with isolation valves, valve boxes, riser pipe, swivel assembly and nozzle.

valve boxes are not required as the isolation valves can be placed below the water monitor in vertical position.

It will be reviewed during detailed engineering.

21 V.IIB/S-V : 9 3.01.02 Fixed Water Spray System

All the water spray system pipes are tapped from hydrant network.

In Flow Diagram For Fire Water Supply System, separate pumps and headers are shown for hydrant and spray system. However we have considered common header for hydrant & spray system as per technical specification, cl. no. 3.01.02. Please confirm

For Fire Water Supply System, separate pumps and headers for hydrant and spray system to be considered as shown in the Tender flow diagram.

22 3.03.02 Analog reset cable type LHSC shall be provided along the conveyor to give an alarm as well as for automatic operation of water spray deluge system independent of signal from multi detector and heat detector.

Please clarify the requirement of infra-red detectors for coal conveyors.

Solar blind infrared emberdetectors and LHS cable to be used as fire detectors for Coal Conveyors.

23 V.IIB/S-V : 10 3.01.03 (i) Each of the outdoor deludge valves and its accessaries shall be provided with housing

Please specify the material of housing i.e. Brick work, steel structure with sheeting etc

Brick Work with roof sheeting

24 V.IIB/S-V : 11 3.03.03 Multi detectors & heat detector shall be provided in control rooms, control equipment rooms, UPS room, Battery charger room for auto operation of inert gas system.

Please clarify the scope of inert gas system for control rooms, control equipment rooms, UPS room, Battery charger room.

Inert Gas system is not envisageed for this project.

25 V.IIB/S-V : 11 3.04.00 Buried Pipeline The coating shall consist of one coal tar primer coat, one coal tar enamel coat, warping fiberglass and one more coat of enamel and the final wrap of enamel impregnated fiibreglass.

As per Standard practice coal tar wraping with 4 mm thickness is provide. Pl clrify


26 V.IIB/S-V : 11 3.04.03 After entire fire water piping is erected and before wrapping/coating and backfilling, the pipelines shall be subjected to a hydrostatic test at 1.5 times the design pressure for a period of two (2) hours.

Hydro test will be carried out as per site condition Owner's Techincal Specification shall prevail

V.IIB/S-V : 52.02.00 Scope of supply

2.02.04 63 mm (7.5 M x 2nos) reinforced rubber lined woven jacketed hoses as per IS: 636, Type-A, complete with all fittings for each hydrant points on wet riser and 63mm 2 nos. unlined. Canvas hoses (IS: 4927) of 15m long each shall be provided for outdoor hydrant points.

Please clarify the type of hose to be considered for 15 m long hose pipe.

As per Techninal spec, unlined Flax Canvas Hose shall be considered for 15 m long hose pipe.

V.IIB/S-VA-DS : 13SECTION-V ANNEXURE DATA SHEETS

8.00.00Hose Pipes

8.02.00 Type : RRL woven jacket, Type-A as per IS-636

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V.IIB/S-V : 9 3.01.01 Pressurized Hydrant System

All hydrant valves shall be of Stainless Steel construction confirming to IS: 5290 Type-A.

As per technical specification Cl. no. 3.01.01, Stainless Steel construction confirming to IS: 5290 Type-A have been considered.

Confirmed.

V.IIB/S-VA-DS : 11SECTION-V ANNEXURE DATA SHEETS

7.00.00External Fire Hydrant Valve with Stand Post

7.07.02 Hydrant valve body: IS-318 grade LTB-2

29 V.IIB/S-VA-DS : 10SECTION-V ANNEXURE DATA SHEETS

4.00.00 Allowable velocity of fluid in pipeline to be considered for pipe size selection. Header - 2.1 - 2.4 M/Sec.

5 M/Sec. velocity have been considered for hydrant system piping. Please confirm.

Confirmed.

30 V.IIB/S-V : 5 3.01.02 Fixed Water Spray System

The following MOC have been considered for below items:1) Deluge Valve - Cast Iron2) Spray Nozzle - Brass3) QBD - Brass4) Butterfly Valve - Cast Iron.Please confirm.

MOC to be considered for below items as:1) Deluge Valve - Cast Iron(IS :210 FG 260).2) Spray Nozzle - Cast Bronze ASTM B-145/Alloy 5A/Brass.3) QBD - Brass4) Butterfly Valve - Cast Iron (IS :210 FG 260).


6.07.00Material of Construction

6.07.01 Body/bonnet & cover : Bolted type Cast iron Material of Construction for Gate, Butterfly & non return valves have been considered.Please confirm.

Material of construction for Body, cover, door, bearing holder of Gate / Globe / Non-return valves ( above 50 NB) shall be Cast Iron as per IS:210 Grade FG 260 for Fire protection system upto 14 kg/cm2(g) pressure.


9.00.00Branch Pipes, Nozzles and Nozzles Spanner

9.05.00 Size and quantitya) Branch pipe : 63 mm NB two (2) nos. for each hydrant point

As per TAC, one (1) nos. for each hydrant point is considered. Please confirm.


33 Vol. IIB, Section VI, SPECIFICATION FOR SERVICE WATER AND POTABLE WATER SYSTEM

Page-1, Cl. 2.00.00 – System Description

“The pumped potable water will be stored in a overhead potable tank for further distribution to various facilities/building”34 Page-2, Cl. 3.02.00 - Scope

of supply/ services, (A) Service Water and Potable Water Distribution

“Supply & installation of 2 x100% Capacity Service Water Pumps and 2 x 100% Capacity Potable water Pumps complete with Electric Motor drive & accessories within pump house and complete piping, fittings, valves & instruments etc. for the system will be in the scope of Bidder.”

35 Ref. Vol. IIB, Section C1 Page-13, Cl. 3.00.00 – SCOPE

“Civil & Structural Works, Sl. No. (f): RCC Overhead tanks of capacity 30 cum. for potable water at a height of 25m (approx.).”

36 Vol. II-F, General Drawings Folder Dwg. No. 13L16-DWG-M-SW-PI-001, Rev. 0

Flow Diagram for Water Supply System

37 Ref. Vol. IIB, Section VI, SPECIFICATION FOR SERVICE WATER AND POTABLE WATER SYSTEM

Page-1, Cl. 2.00.00 – System Description

“2 x 100% capacity service water pumps will be installed inside a pump House adjacent to the reservoir for supplying water to the service water network.”38 Page-2, Cl. 3.02.00 - Scope

of supply/ services, (A) Service Water and Potable Water Distribution

“Supply & installation of 2 x100% Capacity Service Water Pumps and 2 x 100% Capacity Potable water Pumps complete with Electric Motor drive & accessories within pump house and complete piping, fittings, valves & instruments etc. for the system will be in the scope of Bidder.”

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We have considered 2 Nos. (1W+1S) Potable Water Transfer Pumps of 30 m3/hr capacity, to fill the overhead tank (30 m3) in 1 hour time. Please confirm.

Service Water Pumps capacity is considered based on following tapping point working simultaneously:- 2 Nos. Tappings of 5 m3/hr for Transfer Houses - 1 No. Tapping of 5 m3/hr for RLS Area- 1 No. Tapping of 5 m3/hr for requirement along the conveyors- 100 m3/hr tapped for Potable Water Treatment Plant from Service Water Pumps Outlet

Will be reviewed by Owner during detail engineering stage.

Confirmed.

39 Vol. II-F, General Drawings Folder Dwg. No. 13L16-DWG-M-SW-PI-001, Rev. 0

Flow Diagram for Water Supply System

40 General Please provide Water Balance Diagram. Bidder to prepare WBD

41 V.IIC1/S-I : 133.00.00 SCOPE

3.00.00 : P) Drive houses of different sizes Please provide the drive house details Detailed design of Drive House to be done by Bidder during detailed engineering.

42 V.IIC1/S-I : 155.00.00 GENERAL REQURIEMENT

5.04.01 FLASE CEILING False ceiling in control rooms shall be of suspended permanently colour coated aluminium framed ceiling system with 50mm thick mineral wool insulation bound in polythene bags and shall be laid on top of panel

V.II C2/S-XIII : Techical Specification for suspecnded ceiling - Not specifying the requirement of 50mm thick mineral wool. Please confirm the 50mm thick mineral wool requirement

Bidder shall follow specification requirement- Volume-II/C1/S-I, Clause no:5.04.01.


5.04.02 FLASE FLOORING False flooring in control rooms shall be of 35mm thick wooden particle boards

V.II C2/S-XII : Techical Specification for Flase Flooring - Not specifying the same. Please Calrify

Bidder shall follow specification requirement- Volume-II/C1/S-I, Clause no: 5.04.02.


5.06.03 Scope of Work Concrete plinth protection, 1.0 m wide, shall be provided around the buildings.

V.II C1/S-IV : 3.01.14 "Plinth Protection -Minimum 750 mm wide with M-15 concrete plinth protection along building periphery shall be provided". And Cl:4.0.0.00-9 g. "750 mm wide, minimum, R.C. paving as plinth protection, shall be provided around all buildings". Please Calrify which one we have to consider.

Bidder to consider Concrete plinth protection, 1.0 m wide shall be provided around the buildings.

45 V.IIC2/S-XV : 74.3.0 WBM- / Sub basebase coarse

4.3.0.2.1 coarse agfrigates- general requriements

Table III - Sl. No: 1 Requirements - Max. 60% and Max 50%

V.IIC2/S-V : page:6 -3.4.0 WBM- / Sub basebase coarse - 3.4.2.1 - coarse agfrigates- general requriements - "Table III - Sl. No: 1 Requirements - Max. 50% and Max 40%. Please clarify which one one we have consider.

Bidder shall follow specification requirement- Volume-II/C2/ S-V, Page-6 Clause no: 3.4.2.1- Table -III, Sl No1.

46 Detailed Price breakup for civil work 19 construction of STP including control control room Please provide the STP type and capacity No STP is envisaged for the Mine-end CHP. Sewage System for Infrastructural facilities shall consist of septic tank, Up flow filer and soak pit.

47 Detailed Price breakup for civil work 22 Railway loading system Please provide Railway loading system details Rapid Loading System of 4000 TPH as per the Technical Spec.

48 Detailed Price breakup for civil work 31 Rain water harvesting pond Please provide Rain water harvesting pond location & capacity

Refer the revised plot plan and technical spec.

49 Detailed Price breakup for civil work 33 Security barrak and CISF barrak Please provide Security barrak specification with no of users,type of barak

Security barrack will be for 50 security personel and construction will be RCC frame structure with all architectural items. CISF barack and security barack are the same.

50 Detailed Price breakup for civil work 37 Elevator for administrative block Please provide Elevator details Consider Digital Controlled (Automatic) Elevator for 10 persons. Not required for admin. Bldg, however it will be provided in RLS ( Industrial type)

51 Detailed Price breakup for civil work 44 Pit head Please provide Pit head details Not Required at this moment.Not in Bidder's scope

Service Water Pumps capacity is considered based on following tapping point working simultaneously:- 2 Nos. Tappings of 5 m3/hr for Transfer Houses - 1 No. Tapping of 5 m3/hr for RLS Area- 1 No. Tapping of 5 m3/hr for requirement along the conveyors- 100 m3/hr tapped for Potable Water Treatment Plant from Service Water Pumps Outlet

Will be reviewed by Owner during detail engineering stage.

52 Detailed Price breakup for civil work 45 First Aid center Please provide First Aid center details There will be a First Aid Room in place of First Aid Center. Specifications as per the Mines Rule 1955.

53 Detailed Price breakup for civil work 46 Pit head BATH "D" type Please provide Pit head details Not in bidder's scope

54 Detailed Price breakup for civil work 47 Rest Shleter Please provide Rest Shleter details Driver's Rest Room is the Rest Shleter as per the statute.

55 Detailed Price breakup for civil work 48 training center Please provide training center details Permanent type RCC frame structure with all architectural requirements to accommodate at least 40 people.

56 Vol.11-C1,Section-1 Vol.II-C1/S-I : 1 The scope also includes tree felling, transportation of tree logs to OFDC depot, handling Govt. officials and handing over the tree logs to OFDC officials

We understand the Scope of Forest clearance is in the scope of ownerDistance of OFDC depot from site to be indicated

Forest Clearance is in Owner's Scope.Distance of OFDC Depot is approximately 55 Km from site

57 General Construction and potable water As We understand construction & potable water is in the scope of contractor ,pl confirm Boring inside the plant boundary is permitted or not.

Bidder will arrange its own source of construction water.

58 General Labour Camp We understand that land for labour camp shall be provided by owner

Land Accquired by Onwer near Mines site can be provided.

59 General Disposal of surplus earth For Disposal of surplus earth, distance from the main plant to be indicated

Bidder to decide.

60 Volume : II-E, Technical Specifications For Control & Instrumentation & Communication

C&I-1, General Specification – Plant Instrumentation & Communication, 1.05.01 (Scope of Supply), Page No. – C&I-1 : 3

All system furniture along with operator chairs shall be supplied by the vendor.

Pls understands that furniture shall be CHP Main Control Room Only. Kindly confirm.

All System furniture for all control rooms and substations are to be provided by bidder


C&I – 2, Field Instrument & Automation, 2.01.05, Page No. - C&I-2:1, 2.01.08, Page No. – C&I-2:2

Bin Level Indicator (Radar Type) in the each hopper will be provided. All Level Transmitters are Radar Type unless otherwise specified.

Pls understands that Radar level Transmitter is non-Contact type. Kindly confirm.

Non Contact 3D Scanner Type


C&I – 2, Field Instrument & Automation, Page No. – C&I-2 : 6

Multi core or multi pair cables will be used from local junction box to the marshalling cabinets or Input / Output terminal blocks of PLC System.

Pls understands that cable from junction box can be directly wired to PLC I/Os via terminal blocks instead of using marshalling cabinets. Kindly confirm.

Upto marshalling rack of PLC


C&I – 2, Field Instrument & Automation, 2.05.03, Page No. C&I-2:7, 2.06.03, Page No. C&I-2:8

Inner sheath – Extruded PVC Pls understands that Inner sheath referred here is ‘Insulation Type’. Kindly confirm. Also, kindly confirm type of extruded PVC like Type A, Type B, Type C.

Refer Annexure A of V.II D / S-VII



Outer Sheath – FRLS PVC Kindly confirm type of outer sheath material FRLS PVC type like type ST1 or type ST2.

Refer Annexure A of V.II D / S-VII



Kindly confirm that Electrical Properties and Tests pertaining to instrumentation & control cables are applicable for these cables.

The following tests to be performed for Instrumentation & Control cables: Oxygen Index: Min.29 at room temp. (ASTM-D-2863)Acid Gas Gen.: Max.20% by weight as per IEC 754 Part-ITemp Index : Min 250 O C at 21Oxy. Ind. (ASTM-D-2863)Smoke Density Rating : Max.60% (ASTM-D-2843).Flammability Test : as per IEC 332 Part-ISwedish Chimney Test-SS-424-1475 F3Insulation Resistance 100 M Ohm / Km MinHigh voltage test Rodent & Termite repulsion test (Presence of lead shall be confirmed)Electrical Properties of the Instrumentation & Control Cables shall be as per manufacturer's standard.


C&I – 2, Field Instrument & Automation, 2.21.02, page No. C&I-2:19

The AI cards shall not be more than 16 Inputs. Pls requests confirmation to use 32 I/O channel per module, in order to reduce unnecessary no. of cards.

Kindly confirm.

Shall be 16 inputs per AI card


C&I – 2, Field Instrument & Automation, 2.21.03 – (e), page No. C&I-2:20

Wherever relays are used to interface process input/outputs with PLC, 20% additional relays shall be provided. In addition 20% spare space shall be provided in cabinets to install 20% additional relays in future.

Pls requests confirmation that when 20% additional / spare relays are provided then there will not be requirement of 20% spare space for 20% additional relays in future. Kindly Confirm.

20% Spare space shall be provided in the cabinets in addition to supply of 20% additional relays.


C&I-3, CCTV System, 3.08.13.03, Page No. C&I-3 : 8

Inner sheath – Extruded PVC Pls understands that Inner sheath referred here is ‘Insulation Type’. Kindly confirm. Also, kindly confirm type of extruded PVC like Type A, Type B, Type C.

Refer Annexure-A of V.IID/S-VII


C&I-3, CCTV System, 3.08.13.07, Page No. C&I-3 : 8

Outer Sheath – FRLS PVC Kindly confirm type of outer sheath material FRLS PVC type like type ST1 or type ST2.

Refer Annexure-A of V.IID/S-VII

71 Part-IV. Contracts\Annexure-I.Technical Spec\Volume II\Volume-II F\GENERAL: 0513L16-DWG-M-PL-001(Sheet-1)R-6 Model

Upstream outgoing feeder location for 6.6kV Incoming CHP switchgear to be defined

Plese define the terminal point for cabling for 6.6kV Incoming CHP switchgear

For terminal point refer cl no.-2.07.00 of V.IID/S-I:16 & for cabling refer cl. No.-5.01.00 of V.IID/S-I:18.Refer revised SLD and Plot plan in this regard

72 Part-IV. Contracts\Annexure-I.Technical Spec\Volume II\Volume-II F\GENERAL: CABLING, EARTHING & LIGHTNING PROTECTION

08:01:00 Soil resistivity measurement for designing grounding system is included in scope of this package.

We have considered soil resistivity as 40 ohm meter, howver during soil resistivity measurement change in BOQ shall be considered along with commercial terms.

Bidder shall follow specification requirement.

73 13L16-DWG-M-PL-001(Sheet-1)R-6 Sub-station Building sizes Electrical Building sizes have been considered with respect to the requremet to accommodate the equipment as envisaged in TS. We have not considered the same as per Tender Plot Plan.

Specification calls for minimum requirement only.

74 Part-IV. Contracts\Annexure-I.Technical Spec\Volume II\Volume-II F\GENERAL: CABLING, EARTHING & LIGHTNING PROTECTION

08:03:00 Cable cellar room shall be provided below Switchgear/PMCC/Control rooms.

As per our worikng there may not be any requirement of cable vault, we can envisage cable trenches for cable laying inside sub-station.Pls confirm


75 VOLUME: II-D SECTION-IV TECHNICAL SPECIFICATIONS FOR PMCC, MCC, ACDB, DCDB AND PUSH BUTTON STATION 4.12.00 Current Transformer & Voltage Transformer

04:12:08 Feeders requiring remote metering and/or current monitoring shall be provided with current transducers with calibration for full-scale reading. The output shall be 4-20 mA DC of which shall correspond to the normal range.

We shall consider the use of RS 485 port for communication

Transducer output shall be made available to PLC via 4-20mA DC.

76 CHP Electrical

77 Part-I ITB,Page No.10 of 36Cl. No.3.3

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4,V.IIA/S-IV ,Page 4,Cl.No.4.00.00(j)

Key Single Line Diagram,Doc. No. 13L16-DWG-E-0101,Rev.E

Scope of Work : "33/6.6 KV substation for CHP and 2 nos 33/6.6 KV substation for mines"

Civil & Structural Works : Electrical Substation buildings (Main Sub-station, Receiving Pit Sub-station & RLS Sub-station).

Key Single Line Diagram shows "Mining Substation" & "Workshop Substation" also.

Kindly note scope details mentioned in specifications & SLD are contradictory.

Please clarfiy the total number of substation under CHP bidder scope.

More stringent requirement shall be followed. Refer revised SLD in this regard.

78Doc. No. : 13L16-DOC-CHP-SPEC-001,(PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4),V.IIA/S-IV,Page 1,Cl.No.2.00.00


A) Supply of Equipments & Systems ,Electrical :a)HT auxiliary transformersd) HT phase segregated bus ducts

Key Single Line Diagram shows that tapping 6.6kV HT Supply from clinet 6.6kV Gantry through cable is under CHP bidder scope.

Kindly note scope of supply details mentioned in specification & SLD are contradictory.However HT Auxiliary Transformer & HT Phaseduct is not considered by us as per Key SLD.

Please clarfiy.

More stringent requirement shall be followed. Refer revised SLD in this regard.

79Doc. No.13L16-DOC-CHP-SPEC-001PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, ANNEXURE-I,Page 9


Terminal Point :33 kV Transmission line & 33 /6.6 kV Substation.

Key Single Line Diagram shows that tapping 6.6kV HT Supply from clinet 6.6kV Gantry through cable is under CHP bidder scope.

We presume that 33 kV Transmission line and 33 /6.6 kV Substation are in customer scope and CHP bidder scope starts from tapping 6.6kV supply from customer 6.6kV gantry for feeding to CHP Main Substation & Mine Substation through cables.

Please confirm.

Bidder contention is in line with specification requirement.Refer revised SLD and revised plot plan.

80


Mining Substation : HT PMCC : HEMM-1 & 2 and Pump-1 & 2.

Kindly furnish the rating and location of HEMM-1 & 2 and Pump-1 & 2 indicated in key SLD as the same is required for HT Board /Substation Layout Design/Cable Routing.

Also furnish us the future feeders rating & qty if required to be considered in HT board located at mining substation for furture use.

At present mining substation shall be designed for a total load of 5 MVA. Individual load details for feeders not in Bidder's scope, will be provided during detail engg for equipment sizing purpose. However, total number of feeder to be provided in 6.6 Kv HT PMCC of Mining substation shall be in line with revised SLD. For Owner's future requirement space for one (01)number of identical set of switchgear pannel shall be kept in minimg substation building. Further space for identical incoming cable in future shall be kept in the incoming cable trestle.

81

Area Grading for CHPDrwg No.13L16-DWG-C-CHP-AG-001,Rev.2


Work Shop Substation Kindly furnish us the list of feeders along with rating which shall be fed from Work Shop Substation.

Also clarify scope of auxiliary items under Work Shop Substation like LT PMCC/MCC/PDB /MLDB/ Distribution transformer/PLC /RIO/Battery Charger etc with detailed scope of works & supply under CHP bidder scope.

Refer revised SLD & plot plan in this regard.

82

Doc. No. : 13L16-DOC-CHP-SPEC-001 ; Vol.IID/S-III,Page No.2; Cl.No. 2.09.00

Sufficient spare and vacant feeders must be present to cater to any future requirement.

Kindly furnish us number of customer spare & vacant feeders along with rating/load for which vacant space need to be considered at each boards (HT Board/PMCC/MCC) of all substations in CHP.

Please note same is required for design of board and substation layout.

01 MVA additional load for Owner's future use shall be considered for sizing of HT Switchgears in line with specification requirement. Hence one no vacant panel on each bus section of HT switchgears shall be provided. Regarding spare feeder requirement, bidder shall consider 20% of outgoing feeders of each type as spare subject to a minimum of one number of each type and rating.Further, vacant space for accomodating panels related to future circuits as shown in the revised process flow diagram shall be kept in each switchgear room.

83Doc. No. : 13L16-DOC-CHP-SPEC-001 ; Vol.IID/S-III,Page No.2 ; Cl.No. 2.08.00

Capacity of Incomer breaker and busbar shall be designed taking into account the upstream breaker and any future expansion.

Kindly furnish us the quantity of future feeders with rating/load as the same is required for design of board.

Refer point No 69

84 Doc. No.13L16-DOC-CHP-SPEC-001PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, Page No.9, ANNEXURE-I

Doc. No.13L16-DOC-CHP-SPEC-001PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4,Page No.9, ANNEXURE-I

Terminal Point :33 kV Transmission line

Terminal Point :33 /6.6 kV Substation.

We presume that 33kV Transmission Line & 33kV Gantry of mines switchyard and 33/6.6 KV substation is in cleint's scope as per tender SLD.

Please confirm.


85

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IIA-Content,Electrical Drwg No.13L16-DWG-E-0403

Typical Electrical Layout :CHP Main Substation Kindly furnish us the typical electrical layout of Main CHP Substation as the same is not available in the tender drawings folder.

To be finalised by successful Bidder as per the guidelines stipulated in specification.

86 Doc. No. : 13L16-DOC-CHP-SPEC-001 ; Vol.IID/S-I : Page No. 18 ; Cl. No. 5.04.00

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No. 24Cl.No.7.09.01 (b)

Mining Substation :Mining substation shall receive power at 6.6 kV through two nos. 2x 100% HT overhead cables coming from 6.6kV Gantry point in the bulb area.

Interplant Cable Routing : From gantry point near bulb area to Mining substation

Kindly note cables shall be routed from 6.6kV gantry to mining substation via Main CHP SS/Cable Gallery/Conveyor Gallery/Receiving Pit Substatioin.Kindly confirm.

Refer Clause no.-7.09.01 of V.IID/S-I:24.

87

Doc. No. : 13L16-DOC-CHP-SPEC-001 ; Vol.IID/S-I : Page No.1 ; Cl.No. 2.03.00

Hazardous areas / location in the plant shall be clearly defined and marked on the layout drawings by the Bidder.

Kindly note we have not envisaged any hazardous areas/location in the plant as the project is an open cast mine CHP however plough feeder wheel drive & travel drive motor only shall be flame proof motor as per tender specification.

Please confirm.

Ok.

88

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1, Page No.18Cl. No. 5.01.00

100 KVA DG set shall be used for Admin building and shall be located near admin building. 200kVA DG set shall be located near CHP main substation & shall be used to feed emergency lighting, AC, Battery & UPS charging and other emergency power of CHP main substation, CHP Receiving pit substation and CHP RLS substation

We request you to allow 3 nos. of DG set i.e (100KVA, 50 kVA, 50 KVA DG Set) at CHP main substation, CHP Receiving pit substation and CHP RLS substation respectively instead of a single 200kVA DG set at CHP main substation in order to avoid voltage drop issue/cable terminations etc due to long distance cable.

Please check & confirm.

However Minimum rating shall be in line with specification requirement.

89

Doc. No. : 13L16-DOC-CHP-SPEC-001/Vol.IID/S-XIV : Page No.2 ; Cl.No. 3.01.06

Fuel oil storage tank, piping from fuel storage tank to fuel oil day tanks are to be included in the scope of work

Kindly note we have not envisaged any under ground fuel storage tank for DG set, as fuel oil day tank shall be provided along with DG set as per manufacturer standard practice.

Noted.

90

Doc. No. : 13L16-DOC-CHP-SPEC-001,(PC.CD-006.13L16-CHP-Vol-IID-Sec-4),ANNEXURE-B, Cl. No. 1.10


Termination details: PMCC incomer through bottom entry cable

Termination details: PMCC incomer through NSPBDs are shown.

Kindly note details mentioned in specification & SLD are contradictory.

Please clarify.

More stringent requirement shall be followed.

91 Doc. No. : 13L16-DOC-CHP-SPEC-001PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.21Cl. No. 7.05.00 (iii)

Doc. No. : 13L16-DOC-CHP-SPEC-001PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.21Cl. No. 7.05.00 (iv)

For LV/HV breaker controlled motor feeders, cable shall be capable of withstanding the system fault level for main protection fault clearing time with 0.16 seconds.

For LV breaker controlled outgoing/ incoming feeders of PMCC/MCC , cable shall be capable of withstanding the system fault level for main protection fault clearing time with 0.5 seconds.

Kindly note LV cables for all MCCB/MPCB feeder shall be selected based on current rating & voltage drop criteria instead of fault level criteria due to following reasons :

(a) For smaller motor ratings, termination of cables will be difficult incase cables are desinged based on short circuit criteria.(b) MCCB/MPCB are current limiting type and are selected based on type-2 coordination. Accordingly all the downstream component such as contactor/cable shall be protected from short circuit and overload.

However

Kindly check & confirm.

Follow specification requirement for sizing criteria.

92Doc. No. : 13L16-DOC-CHP-SPEC-001,(PC.CD-006.13L16-CHP-Vol-IID-Sec-4),Page No.2Cl. No. 3.07.00


All non-motor feeders rated below 800 A shall be fed from MCC. From rating 800 A and above, all non-motor feeders shall be fed from PMCC.

Non-motor feeders like 125A, 250A, 400A are shown from PMCC

Kindly note details mentioned in specification & SLD are contradictory.

Please clarify.

Feeder location will be finalised during detail engineering.

93Doc. No. : 13L16-DOC-CHP-SPEC-001PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.21Cl. No. 7.05.04

All cable shall be of 3.5 core (red, yellow, blue, black). Black core shall be used for neutral.

Kindly clarify the requirement of 3.5C power cable for motor feeder.However for HT feeders we have not considered 3.5C or 4C for HT cables.

Refer Annexure-C of V.IID/S-II:24 for tentative cable size of Motor feeder.

94

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.23Cl. No. 7.07.05

High mast lighting towers at suitable places are to be used for area lighting.

Kindly note we have envisaged High Lighting Mast for area lighting as follows:(a) Receiving Pit Area - 2Nos.(b) Silo Area - 1 No. (c) Mine Substation Area - 1 No.

Kindly confirm.

Will be finalised during detail Engineering.

95Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-9,Page No.2Cl. No. 2.01.05

LED lights shall be considered mainly for control rooms, inside of all the buildings including the battery room, street lights & lighting mast.

Kindly note we have envisaged HPSV type of lighting fixture for juntion tower/transfer tower & conveyor gallery.

Please confirm.


96

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.24,Cl.No.7.09.01

Interplant Cable Routing "Space for accommodating additional trays, which may come in future shall be provided in present cable route. Some trays may be required for use by the contractors of other packages which shall be finalised during detail engineering stage."

Kindly furnish us future tray space required to be considered in the cable route for future use.

In addition to the 20% extra space as mentioned in the specification, space for accomodating cables related to future circuits as mentioned in the revised process flow diagram is to be considered.Provision for laying these additional trays in future shall also be provided by the successful bidder.

97


Normal A.C. supply thus made available by the MLDB is 415V, 3Ph, 4W, 50Hz effectively grounded.

Kindly note as per IE 1956 rule,on the surface of a mine or in an open cast mine, the voltage may beraised to 250 volts, if the neutral or the mid point of the system is connected withearth and the voltage between the phases does not exceed 250 volts.

Kindly check & confirm.


98Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.4Cl. No. 2.05.01 (o),(iv)

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-9,ANNEXURE-B,Page 23.

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-9,Page No.2 Cl.No.2.02.01,

Scope of Supply : Illumination : Emergency lights shall be installed in the following areas…Control Rooms, Substations, Fire station, Crusher area, Conveyor gallery / tunnel @ 30 M interval, any other area as per the requirement.

Illumination Level :k) Emergency Lighting : i) Control Room / PMCC Room : 02 Nos. in Substation and 2 Nos. in Control room. ii) Other Areas : 2 Nos. in each floor of TPs, Crusher House, Pump House & any other areas.

Normal A.C. Lighting :The emergency lighting load shall comprise at least 10% of the normal lighting load.

Kindly note statements mentioned in tender specification for emergency lighting philosophy is contradicting.Please clarify.

However mining substation will only have emergency DC fixture at entry/exit of buildings which shall be fed from DC battery bank.

Kindly confirm.


99


3.12.03 Wire size shall be as follows : For point wiring beyond lighting panel : 10 sq.mm. Aluminium. i.e from lighting Panel to junction Stranded conductor box (main run)

Kindly note due to congestion inside conveyor galleries and also from maintenance point of view we request you to allow for use of lighting cables upto 2Cx10 Sq.mm Al (Armoured) from lighting panel to lighting junction box instead of wires/conduits.

Kindly confirm.


100


Technical Specification for Cables : Design Criteria Kindly note since this project falls under open cast mines hence we have not envisaged armour conductivity of 75% to that of core condutor for HT & LT power cables.

As per IE 1956 rule Chapter X “ADDITIONAL PRECAUTIONS TO BE ADOPTED IN MINES AND OIL FIELDS” Clause 122 d) iv) which is for cables specifies that “The metallic covering of every cable shall be Of a conductivity at all parts and at all joints at least equal to 50 per cent of the conductivity of the largest conductor enclosed by the said metallic covering”. In this context please note that Clause 109 (2) clearly indicates that the above precautions are not applicable for installations above ground.

Kindly confirm.


101Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.3,Cl. No.2.05.01 /n (i) & (iii)

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.23,Cl.No.7.08.00,7.08.00,

Scope of Supply : Cabling and Cable tray/trestle/trenches : (i)Cable trenches (Inside substation) and (ii) iii) Inside substation Bidder to provide adequately sized cable trenches/trays/risers to accommodate all cables.

Switchgear/ control room shall have able cellar room clear head room 3.00M ( Minimum)

Kindly note the statement mentioned in two clauses are contradictory.

Please check and confirm whether cable trench or cable cellar need to be provided in substations buildings.

Cable cellar room shall be considered with a minimum clear height ( i.e. Height from BOM to floor) as mentioned in the specification.

102Doc. No. : 13L16-DOC-CHP-SPEC-001,(PC.CD-006.13L16-CHP-Vol-IID-Sec-4),Page No.3Cl. No. 3.17.00

All the I/C, O/G, power supply feeder, motor feeders shall have multifunction energy meters with communication protocol to link with SCADA and EMS system.

Kinldy note motor ratings above 75 kW & ACB power feeders only shall be provided with multifunction energy meters with communication protocol to link with SCADA and EMS system.Kindly confirm.


103Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-15,Page No.1Cl.No.2.00.00

Grounding System : Design Criteria Kindly furnish us soil resistivity data for Earthing Design Calculation.

Refer Pt no.-60.

104Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IIC1,Page No.15Cl.No.5.04.02

False Flooring : False flooring in control rooms Kindly note we have not envisaged false floor in control room since control room will either have cable trench or cable cellar.

Please confirm.


105

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-9,Page No.14Cl.No.3.25.00

Cabling : Buried Cables Kindly note since power & lighting cables are very few (three to four numbers) from substations to auxiliary buildings like Admin,CHP maintenance shop,Fire Station,First Aid buildings,ETP,WTP,Pump House etc hence request you to allow for buried cables inline to procedures mentioned in tender specification.


106

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-9,Page No.20,Cl.No.3.0/Annexure-A

Receptacle Kindly note we have envisgaed receptacle as mentioned below :

(a) 15A, 240V, 2 pole, 3 Pin, industrial type receptacle shall be provided minimum one (1) no. in all floor of TP’s, Switchgear /MCC Room, Control room /control equipment room, Cable Cellar Room, Crusher House, Pump House, etc.

(b) 63A, 415V, 3 phase, 4 Pin receptacle shall be provided:

(i) For conveyors gallery at an interval of 75mtrs on one side of conveyor tunnels/galleries.(ii) One (1) no. in equipment floor of TP/Crusher House, One(1) no. in Pump House,Two (2) no. in Switchgear/MCC room, Control room /control equipment room, etc. and two (2) nos. in Cable Cellar Room.

Please confirm.


107


Receptacle Kindly note for each outgoing feeder of PDB/WDB,maximum five (5) nos. of welding receptacles shall be loop-in-loop-out and maximum one (1) no. receptacles shall be considered running at a time , .

Please confirm.


108Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-4,Page No.2Cl.No.3.05.00

Busbar of PMCC/MCC Kindly note busbar of PMCC/MCC/PDB shall be made of aluminium alloy.Please confirm.


109Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-4,Page No.28Annexure-D,Cl.No.3.03.01

Bus Duct : Bus Conductor Kindly note bus conductor shall be of high conductivity electrolytic grade aluminum alloy.Please confirm.


110

Part-I ITB,Page No.10 of 36Cl. No.3.3



Auxiliary Buildings near to Administrator Building Kindly note auxiliary buildings blocks like (Mech & Electrical Shop,Face Equipment & Repair Shop,Machine Shop,Tool Room),(Dozer Repair Bay,Grader & HEMM Repair,Tool & Maintenance Room,Compressor Room,Dumper Parking,Pump House,Work Shop Substation are not shown/mentioned in Plot Plan Rev.6 and also in scope of work/civil specification hence the above mentioned buildings along with its associated works are excluded from our scope of works & supply.Kindly confirm.

In case the above mentioned auxiliary buildings are in CHP bidder scope of works then kindly furnish the following details. :1)Work Shop Substation scope of work & supply2)List of feeders to be considered in Work Shop Substation.

Refer revised plot plan.

111



Work Shop Substation Kindly note in case Work Shop Substation is in CHP bidder scope of work then all power & lighting supply shall be fed from Work Shop Substation to Administrative Building and auxiliary buildings blocks in the vicinity of Work Shop Substation to avoid voltage drop issue in LT Power Supply System.

Kindly confirm.

Refer revised plot plan & SLD.

99

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-4,Page No.3,CL.No.4.00.00

Distribution Boards : General Kindly note we have envisaged local wall mounted ACDB,PDB & WDB(Welding Distribution Boards) located at transfer house/buildings for feeding non process loads like welding receptacles,Hoists,Cranes,Ventilations,Utility loads etc located in field buidlings like TP/field buildings.


100


HT & LT Board Incomer Cables Kindly note HT & LT Board Incomer Cables shall be selected based on maximum demand.

Please confirm.


101Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.3Cl.No.2.05.01 (I) I)

Scope of Supply : Aux AC : Emergency MCC Kindly note we envisaged Emergency PDB & DG PCC as per Key SLD Rev.E for emergency power and Emergency MCC is not applicable.Please confirm.


102Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.4Cl.No.2.05.01 (O) i)

Complete Indoor/Outdoor area Illumination including approach road illumination.

Kindly note approach road lighting shall be provided for approach roads only which are in CHP bidder scope of supply.


103Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.4Cl.No.2.05.01 (O) ii)

Illumination : Boundary Wall Kinldy note we have envisaged boundary wall lightings only for Administrative building.Please confirm.

Boundary lighting should be considered all along the boundary wall mentioned else where in the specification.

104Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.4Cl.No.2.05.01 (O) iii)

Illumination : Coal Stock Pile Kinldy note since Coal Stock Pile is not in CHP bidder scope of work hence illumination for the same is excluded from CHP bidder scope of works & supply.


105

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.21Cl.No.7.05.00,(B)(iv) & (v)

LV Breaker : Cable Sizing Kindly note LV cable sizing for ACB feeder(Incoming/Outgoing)shall be calculated considering short circuit criteria & fault clearing time with 0.16 seconds due to the following reason :

(i) On consideration of fault level criteria (i.e 50KA for 0.5 sec.) min. cable size shall be 400 sq. mm., Al. which shall not be practicable to terminate at end equipments.


106Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page 7Cl.No.i)(ii)

CHP Receiving Pit Substation : 220V DCDB– Two (2) set

Kindly check and confirm the requirement of 220V DCDB– Two (2) set at CHP Main Substation


107 Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-1,Page No.16Cl.No.2.07.01


Terminal Point: Electrical battery limit for this package shall start from the gantry point in the bulb area, which is within 500 meters from main CHP substation.

Key Single Line Diagram shows 33kV HT lines are terminated near to CHP Main Substation.

Kindly note terminal point details related to power supply mentioned in specifications & SLD are contradictory.

Please clarfiy the terminal point and distance from CHP Main Substation.


108Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-4,Page 2Cl.No.3.08.00

All the breaker feeders shall have numerical relay with communication protocol to link with PLC, EMS system..

Kindly note all ACB breaker feeders and motor feeders above 110kW shall be provided with numerical numerical relay with communication protocol to link with PLC system.


109

Doc. No. : 13L16-DOC-CHP-SPEC-001,PC.CD-006.13L16-CHP-Vol-IID-Sec-4,Page No.2,Cl.No.3.13.00

Soft starters shall be installed depending upon the requirement.

Kindly note we have not considered soft starters as the same is not applicable in the project.


110


24V Receptacle Kindly note we have not envisaged 24V receptacles with inbuilt 240/24V AC transformer.If required kindly specify the distribution philosophy.Please confirm.


111 Area Grading for CHPDrwg No.13L16-DWG-C-CHP-AG-001,Rev.2

Substation FGL Level Kindly furnish us the FGL level of all substation building which are in bidder scope.

Refer revised plot plan

112 CHP_ C & I

113

NIT doc no :13L16-CHP-Vol-IIB-Sec-IA,2.07.00, page no 8.

All fire detection and metal detectors shall be interlocked to the associated belt drives.

Fire detection shall be done by separate dedicated fire detection Panel. Trip interlock from fire panel shall be interlinked with PLC considering group operation. Please confirm

Noted.

114NIT doc no :13L16-CHP-Vol-IIB-Sec-IB,4.08.02, page 19

The temperature detector mentioned above shall be resistance type, 3 wire, platinum wound, 100 Ohms

at 0oC.

We understand that the RTD of HT motor is required to connect to RTD card of PLC through Multi triad cable. Please confirm

Noted.

115

NIT doc no :13L16-CHP-Vol-IID-Sec-3,3.07.06, page 7

Modules are to be interlinked by serial communications to data concentrator unit which in turn will provide serial communication facilities to DCS/PMS

We understand that communication with numerical relay shall be through IEC 61850 only and electrical parameter shall be taken through multifunction meter through serial communication


116NIT doc no :13L16-CHP-Vol-IID-Sec-3,Annexure-C

TYPICAL LIST OF DIGITAL I/O AND ANALOG SIGNALS

We understand that the mentioned IOs are required in relay/breaker/ transformer etc. in switchgear. Please confirm.

I/O list is given for general guidelines only. Exact requirement will be finalized during detail engineering.

117

NIT doc no :13L16-CHP-Vol-IIE,1.05.01, page no2&NIT doc no :13L16-CHP-Vol-IIE,1.05.01, page no2

2 (Two) numbers of Operator‟s Station, 1 (One) number of Engineering station at CHP Main Control Room

&There will be redundant server for automation system with monitor, 1 no engineering station and 2 no. of operator station with 21” LED Monitor each.

We understand that qty of total engineering station is 1 no, 1 redundant server and 2 number 21 inch LED monitor based operator station . Both shall be kept at CHP Main control room. Please confirm.

Confirmed.

118 NIT doc no :13L16-CHP-Vol-IIE, section 1,1.05.01, page no 1.3

1 no. of 200 lines EPABX with 50 nos. of Telephone Set

Please inform proposed location of EPABX station CHP Control Room

119 NIT doc no :13L16-CHP-Vol-IIE, section 2,2.02.00.03, page no2.3

Pull Chord & Belt Sway Switch status will be displayed in the HMI.

We understand that the DI signal of Pull chord signal shall be displayed on HMI

Yes, Pull Chord & Belt Sway Switch status shall be displayed in the HMI.

120

NIT doc no :13L16-CHP-Vol-IIE, section 2,2.03.00.e, page no2.5

Hardwire mimic panel can be operated entire CHP independent of PLC. Starting / Stopping of drives, sequential control, alarm fascia etc shall be available in the hardwired Mimic Panel.

We understand that these mimic panels shall be kept at nearest substation building from where operator can operate the drive. Please confirm.

Hardwire Mimic Panel location is CHP Main Control Room as per PLC System Architecture Drawing.

121 NIT doc no :13L16-CHP-Vol-IIE, section 2,2.07.13, page no2.9

Local console cabinet for belt weigher Local console cabinet for belt weigher can be free standing or can be wall mounting as per manufacturer design.

Shall be free standing type.

122 NIT doc no :13L16-CHP-Vol-IIE, section 2,2.16.b, page no2.16

All Communication cable shall be armoured and the same shall be routed through GI Conduit

We propose that the armoured cable shall be laid on cable tray. Please confirm.

Separate conduit shall be provided as per specification requirement.

123

NIT doc no :13L16-CHP-Vol-IIE,2.21.01, page no 18

For LT drives (>30KW<160KW) current, voltage, power transducer output will be made available to PLC as analog input (4-20 ma).

As per clasue no 3.07.06, page 7 of NIT doc no :13L16-CHP-Vol-IID-Sec-3, Current,Voltage and Power signal shall be taken through Multifunction meter over Modbus protocol. All the mentioned signal shall be taken over Modbus and hardwired 4-20 mA signal is not required. Please confirm

Will be finalised during detail engineering.

124 NIT doc no :13L16-CHP-Vol-IIE,2.21.02, page no 19 and 2.23.02.02 , page no 26

AI/AO card density Both the clauses are contradictory. Please confirm the allowable AI/AO card density.

Please refer clause no: 2.21.02 of VOL-IIE C&I SECTION-2 page no-19

125

NIT doc no :13L16-CHP-Vol-IIE, section 3, 3.01.02, page no 3.1

Minimum 10 nos. of IP based Fixed Camera and 10 nos. of PTZ (Pan Tilt & Zoom) type rugged industrial grade camera for strategic location of Entire CHP. For successful operation of plant more nos. of Camera may please be provided.

Please specify the total quantity of CCTV camera as desired for the project.


126 NIT doc no :13L16-CHP-Vol-IIE, section 3,3.01.02, page no 3.3

20% spare Fiber Optic Cables. We understand that the 20% spare in fibre optic cable core to be provided. Please confirm.

Confirmed.

127

NIT doc no :13L16-CHP-Vol-IIE,section 4,4.01.01, page no 4.1

Adequate no of Horn type speaker is required which will cover entire plant.

We are considering quantity of speaker equal to the number of calling station. Please confirm.

Adequate no. of Horn type speaker shall be included over and above speakers with Field Call Stations so that audio coverage shall be available throughout the palnt area.

128

NIT doc no :13L16-CHP-Vol-IIE, section 5,5.04.02, page no 5.2

EPABX shall have capacity to connect with existing EPABX.

Cable termination from existing EPABX to proposed new EPABX shall be in scope of client. Please confirm.

Supply of interfacing cable, connectintion with existing EPABX and necessary cable termination and any other hardware and software required for interfacing shall be under the scope of the Bidder.

129General

We understand that SCADA is not applicable for this package scope. Please confirm

Follow specification requirement only.

130 CHP_ Civil

131 Doc. No. : 13L16-DOC-CHP-SPEC-001 V.IIA/S-III : 4

Basic Wind Speed at 10 m Height: 44 m/sec as per IS:875 Part-3 (1987).

132Doc. No. : 13L16-DOC-CHP-SPEC-001 Vol.II-C1/S-II : 3

Wind Load: As per IS:875 latest considering basic wind speed 39 m/sec. up to a height of 10.0 m above mean ground level.

133 Doc. No. : 13L16-DOC-CHP-SPEC-001 Vol.II-C1/S-II : 1

2.00.00 Loads: b)Inclined roof: Roof slope above 10 Degree= [75 – (Ø-10) x 2] + [50 – (Ø – 10) x 1.83]

134

Doc. No. : 13L16-DOC-CHP-SPEC-001 Vol.II-C1/S-II : 4

Clause no. 2.00.00 r) - Reduction in live load as per provision of IS:875 shall not be permitted.

135

Doc. No. : 13L16-DOC-CHP-SPEC-001 Vol.II-C1/S-III : 6

4.00.00 DESIGN CRITERIA: Lateral forces shall be resisted ……….moment resistant frame.

This is not a general practice which is adopted for the trestle & the Junction tower bases. Horizontal forces are transferred to the bases of the steel column through the vertical bracings. In this case the column bases are assumed as hinged. If provision of vertical bracings are not possible due to any interferences like road crossing / conveyor entry / exit, then only stiff jointed moment connections are provided at base. Please confirm.

Bidder's proposal is accepted.

136 Doc. No. : 13L16-DOC-CHP-SPEC-001 Vol.II-B/S-1 :23

5.01.04- Transfer Houses - All TPs shall be provided with stair access from ground level.

137 Doc. No. : 13L16-DOC-CHP-SPEC-001 Vol.II-B/S-1 :23

5.01.04.01 - Independent staircase having minimum ….. At all floors.

138

Doc. No. : 13L16-DOC-CHP-SPEC-001 V.II-C1/S-IV : 20

18. Water Supply and Sanitation :e) Each toilet shall contain following best quality fittings/porcelain fixtures in adequate numbers as per National Building Code. In toilets primarily meant for workers an additional squatting type WC shall be provided. Minimum one exclusive toilet facilities for handicapped shall be provided in each floor.

We understand that toilet shall be provided for the non plant bldgs like Admin bldg, CHP office bldg, Canteen, Security gate house etc. However the NIT drgs for these non plant bldgs does not show any provision of exclusive toilet facilities for handicapped. Please clarify whether this type of toilet facility is required or not. Incase this facility is required for these bldgs please revise the relevant NIT drgs accordingly.


143

Doc no. 13L16-DOC-CHP-SPEC-001 V.II-C1/S-II :6

Clause no. 3.00.00 q) Drains - For design of drains, following design criteria ……..The flow of drain shall be guided by the grading of the area, so that drain outlet can be connected to the natural source of water at the lowest point.

We understand that the drainage system consisting of the garland drains around the bldgs (in our scope of work) and the roadside drains will be connected to the nearest water body like existing drain / nullah . Please confirm whether our understanding is in order.

All the drains are in bidder's scope.

144Doc no. 13L16-DOC-CHP-SPEC-001 V.II-C1/ S-IV:19

Cl 4.00.00 19. Painting (f) - All structural steel members including ….. two or more coats of epoxy paint or PU paint & shall have minimum 110 micron DFT.

Clauses 2.00.00 b) and 2.00.00r) are not contradictory, they are in seperate subjects; viz., one is for live load on sloped roof, and other is the reduction of live load as per IS;875. Owner's Techincal Specification shall prevail

Please let us know which one has to be followed for this project.

We are not clear with this contradiction. Please clarify this.

Please clarify whether these independent stair blocks shall be side & roof cladded or not.

Basic Wind Speed shall be as per IS : 875 at site location.

Bidder shall follow specification requirement- Volume-II/C1/ S-III, Clause no:1.00.00 g). Two coats of primer followed by two finish coats- Total DFT: 110 micron(Minimum).

Stair case should be inside the building.

Please furnish the detailed painting specifications for structural steel indicating the DFT for each coat of primer & finish . We have also noticed 410 DFT at some places with 350 micron in a single coat, which is not possible. Since this is not for sea application, we feel such high DFT paint is not required. Need to be discussed and frozen

145


Cl 1.00.00 STRUCTURAL STEEL DESIGN (g) Shop primer paint shall be single coat of red oxide zinc- chromate primer…two or more coats of synthetic enamel paint….…total Dry film thickness of the finished paint shall not be less than 110 microns

146

Doc no. 13L16-DOC-CHP-SPEC-001 V.II-C1/ S-I :13

Clause 3.00.00 k) - Sewarage system for infrastructure bldgs

We are considering isolated septic tank & soak pit system for sewarage discharge of the toilets for the non plant structures. No separate sewarge network is considered. Please confirm.

Confirmed.

147


Cl no.4.00.00 Design Criteria -The double angle back to back with gusset plate in between shall not be used in dust laden areas.

Please clarify which portion of the CHP area shall be considered as dust laden areas.

Entire CHP area is dust laden except admin and canteen building area.

148Doc no. 13L16-DOC-CHP-SPEC-001 V.II-C1/ S-IV :10

Cl 3.01.17 (g) - Covered car parking stand for 20 nos cars & 50 nos 2 wheelers & cycle parking shall be provided

Please specify the plinth area of this structure. This will be finalised during detailed enginnering by the sucessful bidder

149

Drg no. 13L16-DWG-M-PL-001 (Rev-6)

Item no. 22 - Culvert Please furnish the size of the culvert to be constructed over the Garia nallah. Also please furnish the HFL of the nallah.

This will be finalised during detailed enginnering by the sucessful bidder

150

Drg no. 13L16-DWG-M-PL-001 (Rev-6)

Road -rail crossing at 2 locations in the MGR area Please clarify in whose scope is this road - rail crossing. If this is in our scope of work then please indicate the Top of Rail level at these junctures so as to enable us to finalise the Top of road level for estimating grading quantities.

Road -rail crossing is in bidder's scope. But the gates shall be provided by OPGC. Top level (RL) of Rail is 257.056

151Doc no. 13L16-DOC-CHP-SPEC-001-Vol-II-C1/S-1 :17

Cl 6.05.00 Structural steel b) Steel tubes for use in light structural steel work ….. conforming to IS - 1161

Structural steel tubes (both SHS & RHS) of grade Yst - 310 conforming to IS - 4923 shall also be used in design . Please confirm.

Confirmed.

152 CHP_Utility

153

Doc. No. : 13L16-DWG-M-SW-PI-001, Rev-0

Building no. 10 - Water treatment potable water reservoir and pump house.Building no. 11 - Service water reservior and pump house.

Apart from the mentioned pump house, we have considered additional pump house near receiving pit sub station. Please provide a water terminal point within 10 M radius of pump house with 2 kg/cm2 pressure.

Refer revised Plat Plan.

154Doc. No. : 13L16-DOC-CHP-SPEC-001, V.IIA/S-IV : 9, CL no: 4.00.00, iii-b)

Service water-5m upstream of service water reservour terminated with an isolation valve.

Client is requested to provide 2 kg/ cm2 water pressure at terminal point. Kindly confirm.

Clarified (Treated) quality water will be provied

at 1kg/cm2(g) pressure at the terminal point.

155 Doc. No. : 13L16-DOC-CHP-SPEC-001, V.IIB/S-VIII : 1, CL no: 1.00.00

The potable Water Treatment system shall consist of………

Kindly provide the total capacity of the WTP. 100 m3/hr

156Doc. No. : 13L16-DOC-CHP-SPEC-001, V.IIB/S-VIII : 1, CL no: 1.00.00

The pressure filter shall be backwashed …. From Overhead Filter Backwash Water tank located in the roof of Potable Water Treatment Plant Buliding.

Bidder shall follow specification requirement- Volume-II/C1/ S-III, Clause no:1.00.00 g). Two coats of primer followed by two finish coats- Total DFT: 110 micron(Minimum).


Please furnish the detailed painting specifications for structural steel indicating the DFT for each coat of primer & finish . We have also noticed 410 DFT at some places with 350 micron in a single coat, which is not possible. Since this is not for sea application, we feel such high DFT paint is not required. Need to be discussed and frozen

We have an Overhead Tank of capacity 30 cum for potable water at height of 25 M. Hence we can avoid the extra requirement of Filter Back Wash Water tank at the roof of the Water treatment plant by using the potable water for the Back washing of the pressure Filters of water treatment plant. Please confirm.

157Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.II-C1/S-I:13, CL no: 3.00.00, f)

RCC Overhead tanks of capacity 30 cum. For potable water at a height of 25m (approx).

158

Doc. No. : 13L16-DWG-M-CHP-PF-001, Rev-2

DS (Wet type DS) for future Receiving Hopper (DH-4).

Please confirm whether it is required to consider the water and Air requirement for DS, DFDS & DE system for future Receiving Hopper (DH-4). Kindly confirm.

Confirmed.

159 Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.II-C1/S-I : 13, CL no: 3.00.00 e).

Service Water reservoir of RCC construction of ...The reservoir will be partially underground and top covered.

Noted.

160Doc. No. : 13L16-DOC-CHP-SPEC-001, V.IIB/S-V : 7, CL no: 3.01.00

The reservoir capacity shall be as per TAC norms. ….partly underground and partly above ground.

Clarified (Treated) quality water will be provied at 1kg/cm2(g) pressure at the terminal point.

165 Doc. No. : 13L16-DOC-CHP-SPEC-001, V.IIB/S-VA-DS:5, CL no: 5

Engine speed: 1500 rpm We have considered Diesel enginee 1800 rpm. Please confirm.


166Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.IIB/S-I : 39, CL no: 22.00.00 .

1. Settling tank shall be designed to ----. The depth should be minimum 2 m depth.

167

Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.II-C1/S-I : 13, CL no: 3.00.00 d).

1. Settling pond of size 20mX45mX4m of concrete paved construction for collection of CHP Area-Run off water from coal stockpiles and other effulent of CHP.

2. Civil Input drg 20mX45mX4m

168Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.II-C1/S-I : 13, CL no: 3.00.00 d).

Settling pond of size …….. from coal stockpiles and other effulent of CHP.

Please provide the coal stockpile area dimension. Coal Stock piles not in bidder's scope

169 Doc. No. : 13L16-DOC-CHP-SPEC-001, V.IIB/S-I : 39, CL no: 22.00.00

EFFLUENT TREATMENT SYSTEMDuring monsoon rainfall runoff from receiving pit…….170

13L16-DWG-M-PL-001(Sheet-1)R-6Effluent treatment palnt is not mentioned anywhere in this plot paln.

171

13L16-DWG-C-CHP-AG-001(Sheet-1)R-7

Dumper washing bay, pre-settling pit, sludge drying bed, chemical shed, overflow pit, tube sttler, oil water separator for effluent treatment plant shown.

172

Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.II-C1/S-I : 13, CL no: 3.00.00 d).

Settling pond of size 20 M x 45 M x 4M of concrete paved constructon for collection of CHP area-Run off water from coal stockpiles and other effluent of CHP……….A pumping station will be constructed for the same. Chemical treatment arrangement shall be provided for settling of fine particles by coagulation & focculation.

We do not provide any focculant for settling dust in settling pond . Hence not considered any chemical dosing/tank. Please confirm.

173 Doc. No. : 13L16-DOC-CHP-SPEC-001, Vol.II-C1/S-I : 13, CL no: 3.00.00 d).

Settling pond of size…water from coal stockpiles and other effluent of CHP

174

Doc. No. : 13L16-DWG-M-PW-PI-001, Rev-0

Waste Backwash water to Coal Settling Pit.

One settling point of size 20mX45mX4m is shown in layout near receiving pit. One more settling pond of suitable capacity is required inside bulb area in the lower contour near drainage outlet. Bidder to decide the exact location as per contour.Refer revised Plot plan.


Refer Clause No- 22.00.00 of V II B /S-1

ETP shall be constructed as per the norms of pollution control Board. Location of ETP has been shown in the revised plot plan.

We have considered RCC Reservoir onground to maintain positive suction head for fire water as well as other water pumps. Request you to provide 2 kg/cm2 water pressure at terminal point.

We have an Overhead Tank of capacity 30 cum for potable water at height of 25 M. Hence we can avoid the extra requirement of Filter Back Wash Water tank at the roof of the Water treatment plant by using the potable water for the Back washing of the pressure Filters of water treatment plant. Please confirm.

There are conflict between NIT clauses and Input drgs. Please confirm the size of the settling pond.

There are conflict between NIT clauses and Input civil drgs. ETP is not required before settling pond. Hence, we are not considering Effluent treatment plant in our scope.Please confirm.

In case we have to consider, we will considerd Stock pile area, receiving pit and TP near by receiving pit.

We have considered pipeline from the Waste Backwash Water to the nearest drain only. After that the Effeluent shall go through the drain up to Coal Settling Pond. The same is applicable for the others area of effluent generating points. Please confirm.

176

General

Please provide the allowable moisture addtion % for dust suppression and dry fog dust suppression system.

Maximum 20 %

177

General

We have not found any requirement of Pollution control system at Wagon loading point below RLS building as per NIT/Flow diagram. So we are not considering any pollution control system ( eg. DS/DFDS/DE system ) for RLS building. Please confirm.

RLS shall have inbuilt DS system.

178

General

Motor kw and painting specification of equipment shall be as per manufacturer standard.


179

General

If any design parameter or moc is not available in NIT, the same shall be considered as standard industrial practice or L&T's standard practice.

If any design parameter or moc is not available in NIT, the same shall be considered as standard industrial practice or bidder's standard practice.

180General

Please provide the Service water analysis report. Service water analysis is attached.

181 CHP_Mechanical

182

NIT:Part-I ITB, Page 8 of 36

Coal Transportation System:A dedicated coal supply system is under development by OPGC, comprising Merry Go Round (MGR) railway network of approximately 50 km long for transportation of coal from Manoharpur coal mine to ITPS.

We presume that the MGR related any MECHANICAL/ELECTRICAL, INSTRUMENTATION /CIVIL & STRUCTURAL works like tree felling, transportation of tree logs, Land grading, excavation, backfilling, disposal of excess soil, lighting, signaling, etc. are not in CHP package.

Noted.

183

NIT:Part-I ITB, Page 9 of 36

MO will also be responsible for operating and maintaining the CHP from the third year of its operation.(xii) Supply of three years operational and maintenance spares as per the scope given,(xv) carrying out operation and maintenance of the CHP for a period of 3 (Three) Years from the date of Commissioning of the CHP.

184

Doc. No. : PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, V.IIA/S-I : 1

The bidders is also required to operate and maintain the coal handling plant for 1st two years of its initial operation at full load and provide hand holding and supervision service in the 3rd year of its operation. Separate agreement will be made with the successful bidder regarding the O & M operation.

185 Doc. No. : PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, V.IIA/S-IV : 1

METEOROLOGICAL DATA Please furnish the Highest flood level data of GARIA NALA

HFL of garia nalla near bridge is 241.00 mtr. approx.

186 Doc. No. : PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, V.IIA/S-III : 3, CLAUSE-1.00.0

a) Receiving Pit with three (3) steel hoppers (Cap-250M3) each of tentative dimension 7 M X 13 M

187DRG. NO. 13L16-DWG-M-CON-GA-001

PLAN & ELEVATION OF CONVEYOR BC1A, BC1B & BC1C

Already given in OCPL O&M SCOPE


Please clarify the Operation & Maintenance scope (i.e. for 1st two years or for three years) under CHP bidder.

In context to the 100 T dumper (pay load of coal ~48T ) and 10 m height of Dumper platform as proposed in the tender documents, 250 cu.M steel hopper for receiving pit is in very higher side and not feasible. We propose 120 cu. M steel hopper for receiving pit. Please check and confirm the capacity of steel

188 Doc. No. 13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 1, CLAUSE-1.00.01

rear discharge dumpers of capacity 100 T.

189

DRG. NO. 13L16-DWG-M-CON-GA-001

PLAN & ELEVATION OF CONVEYOR BC1A, BC1B & BC1C

We understand, single side dumping is only feasible in the receiving pit layout, please confirm.


190

Part-I ITB,p.no 10/36,3.2. Project Structure

………..Certain other infrastructure required for mining are also included in the scope of this ICB and required to be completed by the Successful Bidder.

Please specify the other infrastructure mining facilities required for this ICB.


191

Part-I ITB,p.no 10/36,3.3. Scope of Work

The design of the proposed CHP shall be proven, reliable, energy efficient, pollution free, zero discharge and meet the requirements of the Contract and the purpose of the Project.

Please elaborate scope under CHP bidder related to the energy efficient, pollution free & zero discharge.


192

Part-I ITB,p.no 10/36,3.3. Scope of Work

The total Project is required to be completed within 600 days from the date of issuance of NTP. The detailed Scope of Work and Technical specifications are included in Part – IV of the RFP.

Due to stringet time schedule, Basic and Detail engineering will be completed side by side and also excution activities will be started side by side. Therefore we request you to de link the engineering and project execution activities. Please accept.

Owner's Specification shall prevail

193 Appendix-10A J - WORK SHOP FOR MINES - 365 Days

194 PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, V.IIA/S-IV : 4

w) CHP Maintenance Workshop

195

Appendix-10A

6-Main Store Building We presume that the main store building is not in CHP bidder's scope as the same is not mentioned in the VOLUME : IIA LEAD SPECIFICATION neither in the Plot Plan. We have considered only Store Shed as shown in the Plot Plan. Please confirm

Permanent main store building is required.

197Appendix-10C

2.2 Noise & Dust Guarantee for CHP-One (1) meter from each piece of equipment-75 dB(A)

198

PC.CD-006.13L16-CHP-Vol-IIA-Sec-5, V.IIA/S-V : 15, Clause-18.02.00

Noise Level Requirement:-The plant shall be designed, constructed and provided with suitable acoustic measures to ensure the noise level criteria as per the following stipulations :a) Maximum noise level shall not exceed 85 dB (A) when measured at 1 meter away from the noise emission source, at a height of 1.5 meters above finished floor level.

199

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 3, cluse-2.01.02.01

A “guide curb” shall be provided at the dumper unloading area to alert the drivers when they are getting off line. This curb shall be 1.5 m (minimum) wider than the width between truck wheels. These curbs shall extend out from the building at least 5m.

Please provide clear dimensions for guide curb i.e. length & height and also show in relevant NIT drgs.. We presume 5 m length is from the retaining wall of dumping platform.

Bidder to Consider the Length of the Wall as 6m.


Confirmed.

Odisha State Polution control guideline will prevail

In context to the 100 T dumper (pay load of coal ~48T ) and 10 m height of Dumper platform as proposed in the tender documents, 250 cu.M steel hopper for receiving pit is in very higher side and not feasible. We propose 120 cu. M steel hopper for receiving pit. Please check and confirm the capacity of steel

We understand that the CHP Maintenance Workshop is only under CHP bidder's scope. We have not considered any work shop for mines in CHP bidder's

Both are contradictory. We are considering Maximum noise level 85 dB within 1.5 meter away from the source. However this noise level may increase during material flow in chutes with metallic liners. Please accept.

200PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 3, cluse-2.01.02.04

The dump hoppers shall be 8 m wide at the top. This shall allow 1.5m (min) on either side of the dumper to avoid spillage. The valley angle of hopper shall not be less than 55 degrees.201

13L16-DWG-M-CON-GA-001PLAN & ELEVATION OF CONVEYOR BC1A, BC1B & BC1C : 7000 mm hopper width.

202 PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 4, cluse-2.01.05.01

The entire chute work shall be made of minimum 20mm thick TISCRAL/ SAILHARD.

203

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IC, V.IIB/S-I-DS : 36

DUMP HOPPER (RECEIVING PITS), CHUTES & SKIRT BOARD:-Apron Feeder Skirt & Discharge Chute :-Material of construction& Thickness : 12mm thk. MSLiner material & Thickness : 12mm thk. HARDOX or equivalent.CHUTES –For handling (-)1000mm ROM coal, (-)300mm & (-100)mm Crushed coalMaterial of construction& Thickness : 20mm thk. Hardox

204

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 3, clause-2.01.04.03

The sizer shall be able to slide out for overhaul. Proper maintenance access shall have to be maintained. Lifting beam and electric hoist shall be located at the sizer level for removal of motors, gearboxes etc.

205

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 2, clause-2.01.01.04

Open space shall be kept for easy access of mobile crane etc. to have the facility of dismantling the crushers, to be used at IPCC in future.

206

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IB, V.IIB/S-I : 11, clause-4.01.05

Power requirement and belt tensions shall be calculated for guaranteed capacity on the basis of procedure given in the latest edition of `Belt Conveyors for Bulk Materials' by CEMA, USA.

We propose CEMA-5 or IS:11592 for conveyor Power requirement and belt tensions calculation. Please confirm.

Latest edition of CEMA shall prevail for conveyor Power requirement and belt tensions calculation

207


For calculating minimum slack side tension to be provided from wrap consideration a factor of 1.5 over total effective belt tension is to be considered to prevent slippage of belt during starting.

This factor to be considered as per applicable coupling / CST manufacturer recommendation.


208


All troughing idlers shall be of 3-roll type having 35 degree troughing angle. The rollers‟ dia shall be as specified in Data Sheet with heavy duty seamless steel tube having minimum thickness of 6.3mm.

Tolerance on wall thickness (6.3mm nominal) shall be as per manufacturer standard.

Tolerance on wall thickness shall be as per code/standards.

209PC.CD-006.13L16-CHP-Vol-IIB-Sec-IB, V.IIB/S-I : 16, clause-4.05.01

………..In general the type of Gear box shall be helical. If required, bevel helical shall be provided subject to owner's approval.

We propose bevel helical type gear box only. Please accept.

Noted.

Dump Hopper width at the Top shall be decided by the Sucessful Bidder considering specified Storage Capacity during detail engineering subject to Minimum of 7m.

(-100)mm Crushed coal: The entire chute work shall be made of minimum 20mm thick TISCRAL/ SAILHARD.CHUTES –For handling (-)1000mm ROM coal, (-)300mm coalMaterial of construction& Thickness : 12mm thk. MSLiner material (Welded Type) & Thickness : 12mm thk. HARDOX or equivalent.

Suitable hoisting and handling arrangements shall be provided considering heaviest weight to be handled.

Both are contradictory. Please clarify

Both clauses are contradictory. Please specify zone wise MOC (with thickness) for mother plate and liner plate of the chute, skirt , hopper, surge bin at RLS, Weigh hopper. And also type of liner fixing to mother plate.

Both clauses are contradictory. Please clarify.

210


Minimum clearance of 1 metre shall always be provided from any equipment/structure/pedestal inside the building.

211 PC.CD-006.13L16-CHP-Vol-IIB-Sec-IB, V.IIB/S-I : 22, clause-5.01.01

Clearance around drive units/equipment shall not be less than 1200 mm.


3.15 mm thk. MS deck plate shall be provided throughout the loading zone of conveyor length.

Deck plate considered only for loading zone. Please confirm.


213


Adequate number of Sump pumps with stand-by to be provided at required locations with automatic level control including discharge piping. Also capacity of sump pits should be adequate to match with pump requirement and subject to owner's 214

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IC, V.IIB/S-I-DS : 44, Data sheet - 17, sump pump

Location... Qty of sump pumps...

215


For single conveyor galleries Minimum 1000 mm (clear) side walkway on one side (conveyor drive side) and minimum 600 mm (clear) side walkway on other side for gallery of all conveyors and also 1500 mm (clear) walkway on either side of Tunnel for the belt conveyor in tunnel shall be provided. Clear central walkway of 1000mm width and side walkways of 1000mm width for double conveyor in 216


Walkway on either side of conveyors along with hand railings (two nos.) on both sides of walkway shall be provided. 1000 mm (clear) side walkway on one side (conveyor drive side) and 800 mm (clear) side walkway on other side for gallery of all conveyors shall be provided. External / Internal belt cleaners for all conveyors shall be provided.

.

Both are contradictory. Please specify the walkway width for single / double conveyor gallery and as well as for tunnels.

For twin conveyor gallery each side walkway shall be 800 mm clear and central walkway shall be 1100 mm Clear. For Single conveyor gallery side walkway shall be 800 mm and 1000 mm Clear.This clear dimensions shal be followed for all conveyor gallaries. For twin conveyor Tunnel each side walkway shall be 800 mm clear and central walkway shall be 1000 mm Clear. For Single conveyor Tunnel side walkway shall be 800 mm and 1000 mm Clear.This clear dimensions shal be followed for all conveyor Tunnels.

Clearance around drive units/equipment shall not be less than 1200 mm.

Minimum no of sump pumps and their locations are specified in data sheet-17. The Bidder shall comply this requirement. However any additional requirement of sump pump which may be required from operational view point during detail engineering stage shall also be included in Bidder's scope.

Both are contradictory. Please clarify.

217

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IC, V.IIB/S-I-DS : 4,

Note -2. Working tension in belt corresponding to design capacity shall not exceed 80% of rated maximum allowable belt tension as per reputed manufacturer.

Rated and design capacity considered same. Please confirm.

20% Margin must be taken for design capacity.

218PC.CD-006.13L16-CHP-Vol-IIB-Sec-IC, V.IIB/S-I-DS : 29,

Note- vi) All underground conveyor pulleys and drive pulleys of all conveyors shall have split case bearings.

We have not considered any split bearing as there is no underground conveyor in this CHP. Please confirm.


219


TESTS :i) Balancing Test (All pulleys shall be dynamically balanced)

We have not considered dynamic balancing for these conveyor pulleys as the same is not required as per standard material handling practice. Please accept.


220


Belt Speed (M/Sec.) : 4 (approx.) Considering the belt speed 4 M/Sec., belt width can be reduced from 1600 mm to 1400 mm for conveyor BC-1A, BC-1B & BC-1C, BC-2A/B, 3A/B, 4A/B, 5A/B, TC-1A/B & 6A/B. Please accept.


221PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 1, clause-1.00.06

In future, in pit conveyor shall discharge coal onto conveyors BC-3A/3B at TH-2.

We are not considering the power requirement for conveyor IPCC(future) at TH-2 for transformer sizing.

Power requirement for future facilities are to be considered now.

222

13L16-DWG-M-CHP-PF-001

PROCESS FLOW DIAGRAM We have not considered any scope related to marked "FUTURE" as shown the flow diagram. Also please note that the conveyor BC5A can only feed to TC2A and TC2B in future. Please confirm

Refer revised flow diagram

223 PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 1, clause-1.00.00

1.00.00 SYSTEM DESCRIPTION

224

13L16-DWG-M-CHP-PF-001

PROCESS FLOW DIAGRAM

225

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 1, clause-1.00.03

………...one apron feeder per Dump hopper, having rated capacity of 1000 TPH.

Considering the 100 T dumper (~48 tons pay load of coal) and 1000 TPH rated capacity, Total dumper travel cycle time from entry point of platform to unloading in hopper and return to entry point will be ~2.8 minute. Accordingly one side dumping provision considered on dumper platform. Please check and confirm.


226Doc. No. : PC.CD-006.3L16-CHP-Vol-IIB-Sec-IB, V.IIB/S-I : 36, CLAUSE-15.00.00

ASH & MOISTURE ANALYSER Detail specification not available, please furnish the same.

Specification for combined ash & moisture analyser will be provied.

229

DRG. NO. 13L16-DWG-C-CB-GA-001

50 THK. GUNITING We are considering 50mm thk gunnting for Ground Bunker Liner as mentioned in the drawing. Please confirm.

Noted.

230

PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, V.IIA/S-IV : 5,

PLOT PLAN : FLYASH UNLOADING YARD & UNLOADING PLATFORM 700M X 20M

We presume that the FLYASH UNLOADING YARD & UNLOADING PLATFORM 700M X 20M are not in CHP bidder's scope.

Noted.

Please confirm the operation requirement of conveyor streams. We presume that one stream is working and other stream will be in stand by mode.


231

13L16-DWG-M-PL-001 (Sht.-2)

Coal Stockyard- C1 & Coal Stockyard- C2 indicated in the Plot Plan.

We do not envisaged any work related to coal stockyard in CHP bidder's scope. Please confirm.

Not in bidder's scope

232

PC.CD-006.13L16-CHP-Vol-IIA-Sec-1-4, V.IIA/S-IV : 5,

PLOT PLAN : FIRE STATION We presume that the fire engine/truck and any other items for fire station are not in the CHP bidder's scope.

Noted.

233 PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, Clause-2.02.01.01

One over ground bunker of 30,000 T capacity


PLAN & ELEVATION OF CONV. BC5A & BC5B


PLAN & ELEVATION OF CONV. BC6A & BC6B

236 DRG. NO. 13L16-DWG-C-CB-GA-001 PLAN & ELEVATION OF COAL BUNKER

237

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IA, V.IIB/S-I : 7, Clause-2.04.16

Suitable Winch is to be provided for belt maintenance / belt changing purpose

We presume that the One(1) manual winch with suitable capacity to be considered for entire plant. We have not considered any other items for belt changing purpose like belt changing roller, clamp, sheave, etc. Please confirm.

One(1) motorised winch with suitable capacity to be considered for entire plant. All other items required for belt changing are to be provided by bidder.

238

Doc. No 13L16-DOC-CHP-SPEC-001, V.IIB/S-1:2, CLAUSE 2.01.01.03

Each receiving hopper shall have individual bin level indicator. The indicators shall show high, medium and low (empty) level as well as lights showing if the apron feeders are running. The bin level indicators shall be of Radar type.

Any type sensors are not recommended for receiving hopper. We are not considering any level indicator for receiving hopper. Please confirm.


239

Doc. No 13L16-DOC-CHP-SPEC-001, V.IIB/S-1:3, CLAUSE 2.01.04.03

The sizer shall be able to slide out for overhaul. Proper maintenance access shall have to be maintained. Lifting beam and electric hoist shall be located at the sizer level for removal of motors, gearboxes etc.

Referring to the NIT DRG. NO.13L16-DWG-M-CON-GA-001, E-hoist / monorail/ shed are not shown over dump hopper area. Please check and confirm any such requirement at dump hopper area.

Suitable handling arrangement shall be proved considering heaviest parts to be handled.

240

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IB, V.IIB/S-I : 25, Clause-7.01.00

The sizers shall be of low height, compact dimension and shall be of lighter weight for easy & quick installation with minimum support and avoid heavy civil foundation. The sizers should be skid mounted for transportability.

Referring to the NIT DRG. NO.13L16-DWG-M-CON-GA-001, drawing does not indicated any such skid mounting for primary and secondary sizer. Kindly clarify

Shall be finalised during detail engineering.

241

Doc. No 13L16-DOC-CHP-SPEC-001, V.IIB/S-1:5, CLAUSE 2.02.04

It is conveyed to surge hopper of 500 Te of RLS via reclaim conveyors BC-6A /6B and series of belt Conveyors BC-7A/7B, BC-8A/8B, BC- 9A/9B.

242 DRAWING NO 13L16-DWG-M-CHP-PF-001, REV.2

RLS 1 & 2 : 4000 TPH

243Doc. No 13L16-DOC-CHP-SPEC-001, V.IIB/S-I-DS:22, DATA SHEET -8 (RLS)

Maximum Continuous Rake Loading Rate : Up to 5000 Metric Tons per Hour

244

245

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IB, V.IIB/S-I : 36, Clause-16.01.02

In context to the NIT drawings, the bunker capacity doesn't meet the storage capacity as proposed in the NIT. Please check and confirm.

Clauses are contradictory. We have considered 500 T steel surge hopper as per NIT specification. Please check and confirm.

The RLS system shall be able to load the rake of 62 nos of BOBRN types of wagons of 65 Te pay load

Please furnish the Type of locomotive. Also please furnish the requirement of OHE for RLS.

Detailing shall be done considering 30,000 T storage Capacity

Exact capacity of surge hopper will be fianalised during detail engineering.

Diesel Locomotive will be used. The model will be clarified later

248 Doc. No 13L16-DOC-CHP-SPEC-001, V.IIB/S-1-DS:29, DATA SHEET-9 , SERIAL NO. (V)

Pulley shaft deflection at hub shall be maximum 5 minutes. Shaft shall be of taper lock/ring feeder/key fitted hub connection.

We propose key type design for all pulleys including drive and discharge. Please confirm.


251 Doc. No 13L16-DOC-CHP-SPEC-001, V.IIB/S-1:6, clause-2.04.01

…...cross-over at 100M intervals


……….crossing over the conveyors at approximately every 180 Metre interval of route length.

253 Conveyor profile drawings We propose half trough transition distance at both tail and head ends. Please accept.


254 NIT conveyor profile drawings Entry points to the building, We are proposing conv incline entrey. Please accept.


255

PC.CD-006.13L16-CHP-Vol-IIB-Sec-IC, V.IIB/S-I-DS : 21, DATA SHEET-7 ,

PADDLE FEEDER: Capacity : 2000 TPH (Rated)Variable capacity : 1800 to 2300 TPH

Please check and confirm the design capacity for all downstream conveyors from ground bunker (i.e. BC6A, BC6B,BC7A,BC7B, BC8A, BC8B, BC9A & BC9B) considering the paddle feeder variable capacity of 1800 to 2300 TPH. However we have considered the design capacity same as rated capacity i.e. 2000 TPH for conveyor BC6A, BC6B and 4000 TPH for BC7A, BC7B,BC8A, BC8B, BC9A, BC9B as specified in the NIT.

For Paddel Feeder rated capacity : 2000 TPH ; Design Capacity : 2400 TPH Capacity Variation : 1800 to 2300 TPH For all down stream conveyors from ground bunker. Design capacity shall be 120% of rated capacity.

256

Part-I ITB

The infrastructural facilities to be constructed as part of CHP are mines administrative building, site office building, security office, security barrack, canteen building, first aid room, boundary wall, WTP and water supply line, raw water reservoir, bridge over Garia nalla, fire station shed, roads including main access and all service roads, 33/6.6 KV substation for CHP and 2 nos 33/6.6 KV substation for mines and any other infrastructural facilities as required for completion of the project.

Design & Construction of bridge over Garia nalla is in OCPL Scope. Please Clarify?

Design & Construction of 2 nos 100 T payload capacity bridge over Garia nalla is in Bidder's Scope.

10.00.00 PADDLE FEEDER

10.01.02 Discharge Wheel & Drives

Smooth and infinitely variable control of the discharge wheel speed will be provided by a Variable Voltage Variable Frequency Drive (VVVFD).

10.01.06 Lubrication

All gear assemblies will be filled with commercial quality oil and the hydraulic system with hydraulic oil of best quality. Other parts needing lubrication will be provided with centralised manually operated lubrication system.

13L16-CHP-Vol-IIB-Sec-IB

257 Discharge Wheel Drive is VVVFD Drive or Hydraulic Drive. Please Confirm?

ELECTRICAL AND CONTROL & INSTRUMENTATION:

Cross Over at 100 M Intervals.

Bidder to consider Hydraulic drive for Paddle feeder.

Both are contradictory. Please clarify.

258

Part-I ITB

The infrastructural facilities to be constructed as part of CHP are mines administrative building, site office building, security office, security barrack, canteen building, first aid room, boundary wall, WTP and water supply line, raw water reservoir, bridge over Garia nalla, fire station shed, roads including main access and all service roads, 33/6.6 KV substation for CHP and 2 nos 33/6.6 KV substation for mines and any other infrastructural

As per OPCL Document Volume II F Drawing No: 13L16-DWG-E-0101 Model (1) is shown Main 6.6KV Supply to be provided by Owner. It is to be 1200 Mtrs From CHP Main Substation. How far from the Mining substation.


259

Volume IIB/13L16-CHP Vol-Sec-1B.pdf

Clause No:4.12.01 Safety switches is requied local indication(Cluster of LED's).

Please confirm what is preffered LED voltage.Hamtek will propose 24VDC only.Because we are considering Belt watch system(Micro processor based).


260

13L16-CHP-Vol-IIB-Sec-IB

As per clause 9.00.00 Power supply to the tripper shall be given through motorized cable reeling drum with trailing cables, cable trays for resting the trailing cables and end limit switches for protection against over travel of the tripper. The cable reeling drum and trailing cable of each tripper shall be suitable for the entire length of the bunker bay. The cables shall have copper conductors, proper insulating material and braided armoring in accordance with IS:691.

Werther we follow composite Cable or separate Power & Control cable Please clarify?

Separate power & control cable shall be used.

261

13L16-CHP-Vol-IID-Sec-7

As per clause No:4.02.06 All control cables shall be of 2.5 Sq.mm copper.

Regulare practice 1.5Sqmm Copper flexible cable used for control wiring and 2.5Sqmm copper lex used for CT wiring for all control panels.So please clarify.


262

13L16-CHP-Vol-IIE

As per clause No: 2.02.00 /3 Stopping of conveyors in case of emergency by Pull Cord Switches, Belt Sway Switches, and zero speed Switches etc provided along the conveyors. Tripping of any conveyor will trip downstream conveyors sequentially. Pull Chord & Belt Sway switch has been envisaged both side of all conveyors maintaining standard distance. Pull Chord & Belt Sway Switch status will be displayed in the HMI. Each Pull Chord & Belt Sway shall have two contacts, one will be connected to PLC through Pull Chord or Belt Sway Controller and other one will be connected to MCC for hardware interlock.

We are considering Micro processor based Belt watch system for pull cord and beltsway switches system per conveyor wise.As per scheme from belt watch panel one number contact will use for Hard wire tripping and One number for switch status to know the PLC.

Minimum requirement as specified in specification shall be met.

263

13L16-CHP-Vol-IIE

As per clause No: 2.03.00 /e Hardwire mimic panel can be operated entire CHP independent of PLC. Starting / Stopping of drives, sequential control, alarm fascia etc shall be available in the hardwired Mimic Pane

We are providing Mimic screen in OES and OWS to know the system status .Hard wire communicaiton is difficulte to bring and connect all control cables in one panel.We are suggesting projector type mimic to show the entire system status.

Apart from OES & OWS hardwire mimic panel interfaced with PLC is required. However the same shall be finalized during detail engineering

264

13L16-CHP-Vol-IIE

As per caluse No 2.06.00 CONTROL CABLE is 1.5SQmm. To be used

Regulare practice 0.5Sqmm/1.0Sqmm copper flexible cable used for PLC module wiring,1.5Sqmm copper flexible cable used for LT MCC and local control panel control wiring like lamps,switches,contactors and 2.5Sqmm copper lex used for CT wiring for all control panels.So please clarify.For HT Panels will used minimum 2.5sqmm cable for control wiring.


265 Please let us know that should we consider the width of dump hopper as 7m or 8m

This will be finalised during detail engineering

266 Please let us know that the shifting of crushers (sizers) and apron feeders with supporting structure from one location to other will be taken place by means of dozer or Transport crawler?

The requirement is not clear.

Please elaborate.

273 Refer to CL No. 5.01.00 of VOL-IID: Please inform the scope of supply of incoming cables from Gantry bulb to main CHP substation.

Bidder's scope for cabling work will start from outgoing terminal of Owner's 6.6KV switchgear located at Mine end CHP substation.

274 Refer to CL No. 5.04.00 of VOL-IID: Please also inform the scope of supply of incoming cables from Gantry bulb to Mining substation.

Refer clarification noted under sl no.-273.

275 We assume that the distance between the gantry bulb and the mining substation is 500Mtrs approx. Please confirm.

Refer revised SLD & plot plan.

276 As there is no preferred make list in the specification, we will submit the same in the offer.

List of approved makes will be provided by Owner.

277 Construction of allied infrastructure is a part of EPC. So we propose to quote a total price against EPC for CHP Main Package, i.e. under Sl. No.1.

RFP Condition shall prevail

278 Under head "Contractor Taxes", only 2 columns, 1st one for Service Tax and 2nd one for Other Taxes, Cess if any, have been provided. Many other taxes apart from these two will be applicable for such EPC type Contracts. We attach one sample price format for your review and implementation of the sameplease.

You need to include all the taxes as applicable to EPC contract. RFP Condition shall prevail


279 Same queries as stated in SL. No. 2 of this sheet. In addition, we propose to quote a total price against Mechanical Plant and Machinery and furnish the detail Price Break Up after award of contract in case we become the Successful Bidder as such break ups are required for Billing Break Ups (BBU).


281 Same queries as stated in SL. No. 2 of this sheet. In addition, we propose to quote a total price against C & I Equipments and furnish the detail Price Break Up after award of contract in case we become the Successful Bidder as such break ups are required for Billing Break Ups (BBU).


282 Same queries as stated in SL. No. 2 of this sheet. In addition, we propose to quote a total price each against Civil Work, Structural Work, Erection and Commissioning and furnish the detail Price Break Up after award of contract in case we become the Successful Bidder as such break ups are required for Billing Break Ups (BBU).


283 Same queries as stated in SL. No. 2 of this sheet. In addition, we propose to quote a total price against Mandatory Spares and furnish the detail Price Break Up after award of contract in case we become the Successful Bidder as such break ups are required for Billing Break Ups (BBU).


284 Same queries as stated in SL. No. 2 of this sheet. In addition, we propose to quote a total price against Special Tools and Tackles and furnish the detail Price Break Up after award of contract in case we become the Successful Bidder as such break ups are required for Billing Break Ups (BBU).


285 We propose to have a separate head for Design and Engineering of the Plant in the Price Bid with applicable Taxes and Duties.


286 We attach a sample Price Bid (Please refer Sheet2 of same file) for your review and incorporation of the same.


288 Please indicate the co-ordinates of all inter-section conveyors inside the all Transfer house.

This will be finalised by sucessful bidder during finalisation of detail engineering

289 Please confirm that (-)100 mm coal from secondary twinshaft sizer will be discharged to only conveyor BC-2A or both the conveyor BC-2A/2B.

Owner specification prevails

290

291 Please explain our scope clearly in the future provision at the Receiving Pit area, TH-1, TH-2 & Future Transfer house TH-6B.

Refer Owner specification

292 Please confirm that single stream or double stream operation will be done from TH-1 to Surge hopper area.


293 Please furnish the Finish floor level (FFL) at all Transfer House area.

This will be decided by the sucessfull Bidder

294 In the Transfer house TH-3, floor height from drive pulley floor to roof is not sufficient for hanging of ILMS-1/2. It should be minimum 8 M- Please confirm.

This will be decided by the sucessfull bidder during detailed engineering

295 In the sectional drawing of Conveyor BC-5A/5B, View D-D is not matching with Flow diagram. Please clarify it.

Bidder to consider revised flow diagram only.

296 Please furnish double conveyor cross-section of conveyor TC-1A/1B & BC-6A/6B.

This will be decided by sucessfull bidder during detailed engineering Considering technical specification.

298 It seems from technical specification that Dumper, Bull dozer & Diesel locomotive & their sheds are not in our scope of supply-Please confirm.

Noted.

299 Please confirm that gratings & Bunker sealing arrangement on Over Ground Bunker has to considered or not in our scope of supply.


300 We are presuming that total Belt Conveyor system from TH-1 to RLS via over ground Bunker shall be designed for (-)100 mm size coal- Please confirm.


301 It is mentioned in the NIT that all Conveyors shall be of steel cord belt.


302 We shall consider N-N Belt/Steel Cord belt based on maximum tension of the belt obtained from Conveyor power calculation-Please confirm.


304 We are assuming Squirrel cage induction Motor Drive for both LT & HT drive- Please confirm.


305 IIB, S-I : 36 16.01.05, 26 of 32 PLC- based batch controller system with RS View HMI, located in the load out control room.

Since RS-view (gateway version) is proprietary feature of Rockwell Automation. Hence we propose HMI Software as per the OEM (within approved makes) standards. Please accept.

Noted.

306 IIB, S-V : 13

22 of 28

The Detection & Alarm system shall have the following features.

We request you to accept the panels and system features as per OEM (within approved makes) specific.

Noted.

307 IIE, C&I-1 : 3 1.05.01, 10 of 76 There will be redundant server for automation system with monitor, 1 no engineering station and 2 no. of operator station with 21” LED Monitor each. One no A3 & A4 laser printer has been considered at CHP Main Control Room.

Please note that two numbers of OS and 1 number of ES has already been specified above in the same clause. Hence we understand that same is duplicated here and not applicable. Please confirm.

Noted.

308 IIE, C&I-2 : 7 & 8 2.05.00 & 2.06.00, 19,20 of 76

Instrument signal and control cable We have considered pair cable - individual and overall shielded, 20 AWG (0.5 sqmm) for analog signals and core cable - 1.0 sqmm for digital signals. Please confirm.

Shall be 1.0 sq.mm pair cables for Analog Signals and 1.5 sq.mm core cables for digital signals

309 IIE, C&I-2 : 16 2.16.06, 28 of 76 The Uninterrupted Power Supply (UPS) system will supply…

UPS shall be considered to supply the power to PLC, HMI, Printer etc for Automation System and other critical loads like CCTV, EPABX & PA system. Please confirm. Local control panels like magnetic separator, metal detectors, scoop coupling, flap gates, flow activation panel etc. don't need UPS power. Please confirm.

Shall be fianlized during detail engineering.

310 IIE, C&I-2 : 18 & 21 2.21.01 (f) & 2.21.04, 30,33 of 76

The SOE inputs pertinent to electrical system will have a scan time of 1 m sec.

We understand that SOE points are not applicable for CHP PLC as per standard industrial practice. Please confirm.However, if at all required, please provide the total count of SOE points required.

As per specification SOE is required. Please consider the count as 120.

311 IIE, C&I-3 : 1 3.01.02, 46 of 76 Minimum 10 nos. of IP based Fixed Camera and 10 nos. of PTZ (Pan Tilt & Zoom) type rugged industrial grade camera for strategic location of Entire CHP. For successful operation of plant more nos. of Camera may please be provided.

We have considered 10 nos. of IP based Fixed Camera and 10 nos. of PTZ camera for strategic location of Entire CHP. If client feels that more no. of cameras are required, please let us know the final quantity of cameras.


312 IIE, C&I-3 : 2 3.01.04, 47 of 76 Monitors for CCTV in the CHP Main Control Room are to be placed on the operators console physically adjacent to Monitors of relevant process segments.

We have considered 2 nos. of Camera Server cum operator station with 21” LED Type Monitor & 1 no. of 67” Large Video Screen, to be placed in CHP control room as per specification. Please confirm.


313 IIE,C&I-4 : 1 4.01.01(2), 55 of 76 3 nos. of Table top mounted microphone and adequate no. of speaker. Adequate no of Horn type speaker is required which will cover entire plant.

We have considered 1 no. horn type speaker at each transfer house, 1 no. ceiling type speakers at control room, MCC rooms and pump houses. Please accept or provide the type and quantity of speakers required location wise.


315 General General - Hand held calibrator We have considered one number universal type Hand held calibrator for the complete plant. Please confirm.

Two (2) nos. of Hand-held calibrator shall be considered by the Bidder for the entire plant.

316 Vol.II - C1, C1/S-I 1.00.00 a, 10 of 52 The scope also includes tree felling, transportation of tree logs to OFDC depot, handling Govt. officials and handing over the tree logs to OFDC officials.

We request the client to exclude the scope of getting approval from forest department ,Tree cutting , Transportation of tree logs to ODFC depot from bedder's scope.


320 General Roads Scope of roads shall be as demarcated in Plot plan no.13L16-DWG-M-PL-001 (sht.1) Rev.6 . Please confirm.

Scope of roads shall be as demarcated in the revised plot plan. However service roads (blacktop road) shall be provided to all the structures and facilities during detail engineering.

430 Land We understand Owner shall provide Land for Contractor’s site office, fabrication yard, storage, labour colony etc. within the site premises

Yes.

431 Roads The Owner shall be responsible for providing access road and temporary service roads for contractors use. Any strengthening, widening of roads and bridges shall be done by the Owner.

All temporary roads and service roads for construction purpose are in the scope of bidder. The bidder may use existing village roads after taking due approval from competent authority.

432 Interference Contactor shall be allowed as and when required with interference with the ongoing operation of the Existing Plant, New Plant, MGR, Manoharpur Coal Block or any part of the Facility or for proper shut downs during interface works

With Permission of Owner.

435 VOL: II-D, Section-I 1.01.00, Page 1 The specification is intended to cover complete electrical work for the CHP including CHP Main substation, CHP Receiving Pit substation, CHP RLS Substation, Mining substation


436 VOL: II-F, General Dwg.13L16-DWG-M-PL-001 ( shet-1) Plot Plan : Mine Substation

437 VOL: II-F, Electrical Dwg.13L16-DWG-E-0101 Key Single Line Diagram

438 VOL: II-D, Section-I 2.05.01, CHP Main Substation, S.No.n, Page 3

Cable routing/entry need to be coordinated with owner’s substation lay out

We request client to provide owner's substation layout and specify the owner's substation location.


439 VOL: II-D, Section-I 2.05.01, CHP Main Substation, S.No.n, iii,

Page 3

Inside substation Bidder to provide adequately sized cable trenches/trays/risers to accommodate all cables.440 VOL: II-F, Electrical Dwg.13L16-DWG-E-0101 Key Single Line Diagram

443 VOL: II-D, Section-I 2.05.01, CHP Main Substation, S.No.O, iii,

Page 4

Entire Indoor/Outdoor illumination in the vicinity of pump house, transfer house, Conveyor gallery and other plant and non-plant buildings related to Coal handling plant including coal stockpile area shall also be considered.444 VOL: II-D, Section-I 2.05.01, CHP RLS

Substation, S.No.m, iii, page 12

445 VOL: II-F, Electrical Dwg.13L16-DWG-E-0101 CHP Main Substation : 6.6kV Outgoing feeder to workshop substation

As CHP workshop is located near to CHP Main substation, we do envisage 415V Workshop MCC fed from CHP LT PMCC at CHP main substation.

Kindly confirm.


In line with key SLD, bidder's terminal point will be 6.6kV Gantry ( in Owner's scope of work). Hence we do not envisage any electrical pertaining to owner's substation.

We understand that coal stockpile is not applicable for CHP Main substation area and RLS area as coal stockyard is located at receiving pit area.

Hence we do not envisage coal stock area illumination in CHP main substation area and RLS area.

All graded area shall be illuminated as per revised plot plan


In line with plot plan, mine substation is excluded from bidder's scope of work ( located outside bidder's scope area). However, as per Key SLD Mine substation is in bidder's scope of work.

Kindly clarify.

446 VOL: II-F, Electrical Dwg.13L16-DWG-E-0101 LT PMCC : ACB Outgoing feeder in LT PMCC Based on the system requirement we do envisage ACB outgoing feeder to MCC.

Kindly confirm.

Minimum requirement as shown in revised SLD shall be adhered.

447 VOL: II-D, Section-I 2.05.01, Mine Substation, Page 12

Mine Substation As Mine CHP ( Input conveying) system is not in bidder's scope of work, we do not envisage electricals pertaining to mine substation in our scope of work.

Kindly confirm.


448 VOL: II-D, Section-I 2.05.03, Page 14 33 kV, 3 ph, 3 wire, 50 Hz, 31.5kA. Bidder shall collect data and verify system earthing and fault level.

As 33kV system is not in bidder's scope of work, we do not envisage any electricals pertaining to 33kV system including data collection and verification of system earthing and fault level.

Kindly confirm.

33 KV system earthing is not in bidders scope. However to finalize the downstream system study necessary data as required will be considered by the bidder. Hence necessary co-ordination is in bidder's scope.

449 VOL: II-D, Section-I 2.05.03, Page 14 6.6 kV, 3 ph, 3 wire, 50 Hz, 40kA for 1 sec. Bidder shall collect data and verify system earthing and fault level

Since client will provide 6.6kV voltage till 6.6kV gantry near each substation ( CHP main substation, RLS substation, Receiving pit substation), we do not envisage any data collection, verification of system earthing and fault level.

We envisage 6.6kV switchgear fault level as 40 kA for 1 sec in line with referred clause.

Kindly confirm.

Specification calls for minimum requirement only. However if actual fault level is higher than the specified fault level, bidder will consider the actual fault level for sizing of electrical equipment.

450 VOL: II-D, Section-I 2.05.05, Page 15 Electrical system study We envisage electrical system study ( load flow, motor starting, short circuit calculations) for bidder's area only.

We do not envisage any electrical system study for owner's supplied system and 33kV system.

Kindly confirm.


451 VOL: II-D, Section-I 2.05.05, Page 15 Electrical layouts, showing equipment location, cable trays, cable trenches in transformer yard, overhead cable routes (cable bridge, cable trestle) etc. cable trenches is acceptable only in Transformer yard.

As all LT service transformers are dry type, electrical layout, cable tray/trench layout for transformer yard is not applicable for bidder's scope.

Hence we do not envisage any layouts pertaining to transformer yard.

Kindly confirm.

Noted.

452 VOL: II-D, Section-I 2.05.05, Page 15 Relay co-ordination and recommended settings, insulation co- ordination, relay setting calculations.

Kindly note that insulation co-ordination is not applicable for 6.6kV Indoor switchgear, hence the same is not envisaged in our scope of work.

Kindly confirm.


453 VOL: II-D, Section-I 2.05.05, Page 15 Relay co-ordination and recommended settings, insulation co- ordination, relay setting calculations.

We envisage Relay co-ordination and recommended settings, relay setting calculations for bidder's supplied equipments only.

Kindly confirm.


454 VOL: II-D, Section-I 5.01.00, Page 17 The power supply for this package shall be received at 6.6kV level at the Gantry point in the bulb area, which is within 500 meters from main CHP substation.

We request client to specify the approx. location of the 6.6kV gantry.

Refer revised plot plan & SLD in this regard.

455 VOL: II-D, Section-I 7.02.01, Page 20 PMCC/MCC/DB shall be sized for maximum 100% connected load plus 20% margin.

456 VOL: II-D, Section-IV 3.04.00, Page 2 The continuous current rating of the bus bars & incomers of the PMCCs/MCCs & DBs shall be the maximum load on the board due to all the running auxiliaries during any operating condition plus 20% margin rounded up to next higher standard rating

457 VOL: II-D, Section-IV 3.04.00, Page 1 PMCC, MCC, ACDB, DCDB AND PUSH BUTTON STATION458 VOL: II-E, C&I-2 2.02.00, Page 2 Intelligent MCC may be connected to PLC through soft connection.

459 VOL: II-E, C&I-2 2.16.04, Page 15 Intelligent MCC may be connected to PLC through soft connection.

460 VOL: II-D, Section-I 7.05.00, A,, Page 20 Rated current of the equipment plus 20% spare capacity. All the cables shall be FRLSH XLPE type

As the equipment is already sized with in-built margin in line with specification, we envisage cable size based on rated current of equipment only ie., we do not envisage 20% spare capacity while sizing the cables.

Kindly confirm.


461 VOL: II-D, Section-I 7.05.00, D, Page 20 HV cables shall be of unearthed (UE) grade for non-effectively earthed HV system (to be verified by - Bidder)

As 6.6kV supply is provided by client at 6.6kV gantry, we request client to confirm the type of earthing for 6.6kV system ( Non effectively earthed or Effectively earthed ).

Kindly confirm.

For non-effectively earthed system U/E grade cable shall be used.

462 VOL: II-D, Section-I 7.05.04, Page 20 All cable shall be of 3.5 core (red, yellow, blue, black). Black core shall be used for neutral.

We envisage 3.5 core cables based on system requirement.

Kindly confirm.

Noted.

In line with CL. 3.04.00 of section-IV, we envisage each PMCC/MCC/DB sizing based on the maximum load on the board due to all running auxiliaries plus 20% margin rounded up to next higher standard rating.

Kindly confirm.

We envisage conventional type PMCC/MCC/ACDD/DCDB.

Kindly confirm.

Noted.


463 VOL: II-D, Section-I 7.07.03, Page 23 In addition to that single phase industrial sockets shall be provided in suitable location.

We envisage single phase sockets as follows:i) 2 Nos. each in office, Admin bldg, control room ii) 1 no in Each floor of conv. JT/crusher house

Kindly confirm.

Will be finalised during detail engineering as per guidelines stipulated in specification.

464 VOL: II-D, Section-I 7.07.05, Page 23 LED type fixtures and fittings are to be used for street lighting, inside buildings, control rooms and masts to reduce energy consumption

465 VOL: II-D, Section-IX 3.10.02, , Page 8 The Mast shall be of 30M height with lantern carriage to enable raising/lowering for ease of maintenance, including the Head Frame.

466 VOL: II-D, Section-I 7.08.03, c), , Page 23 Minimum Space between the sides of two switchgears, between any two panels or between switchgear and the wall shall be 1000 mm. Where access is not envisaged, clearance shall be 200 mm.

We envisage 200 mm clearance between the ACDB/PDB/MLDB/WRDB.

Kindly confirm.

Will be finalised during detail engineering as per guidelines stipulated in specification.

467 VOL: II-D, Section-I 7.08.04, , Page 23 Layout shall have due provision for maintenance area, shift room and all equipment (e.g. Crane, Hoist etc.) for handling of heavy equipments shall be provided.

We request client to specify the min area required for shift room and maintenance area.

This will be provided during detailed Engineering.

468 VOL: II-D, Section-I 7.09.01, , Page 24 Major overhead outdoor interplant cable routes are:a) From gantry point near bulb area to CHP main substationb) From gantry point near bulb area to Mining substationc) From CHP Main Substation to CHP Receiving pit Substationd) From CHP Main Substation to CHP RLS Substation

469 VOL: II-D, Section-XV 2.03.02, , Page 4 For inter plant connections, the cables shall be routed through an overhead cable bridge / pipe cum cable bridge.

470 VOL: II-D, Section-I 7.09.01, , Page 24 Space for accommodating additional trays, which may come in future shall be provided in present cable route. Some trays may be required for use by the contractors of other packages which shall be finalised during detail engineering stage. The successful bidder of the plant package shall provide such trays without any extra cost to owner471 VOL: II-D, Section-I 2.05.01, n), iii, Page 3 ii) Inside substation Bidder to provide adequately sized cable trenches/trays/risers to accommodate all cables.

Iii) In addition to above -bidder to keep 20% free space in each cable tray.

473 VOL: II-D, Section-I 11.04.00 & 11.05.00, Page 26

11.04.00 415V Switchgear/DBs (Indoor) : IP 5211.05.00 415V PMCC / DBs / Fuse Boards (Indoor) : IP 52

Kindly note that maximum height of high mast with LED fixtures is 20 M only. Hence we request client to accept the 20M high mast with LED fixtures.

Kindly confirm.

We envisage cable trestle from substation to nearest conveyor. Further, cables are routed through conveyor gallery.

Kindly confirm.

In the absence of following details, we envisage cable tray design in line with CL. 2.05.01, o iii, page 3. In the absence of following details, we do not envisage any additional trays/ space for additional trays in bidder's cable trestle/route:

i) No. of additional trays required for future requirement for which space provision will be kept by bidder.

Ii) Specify the no. of trays required for other contractors in each route.

In line with standard engineering practice, we envisage IP 5X for 415V PMCC/MCC rated below 1600A and IP 42 for 415V PMCC/MCC rated 1600A and above.

Refer point no.-83




474 VOL: II-D, Section-IV 4.01.02, Page 3 The enclosures of PMCC/MCC shall have a degree of protection IP54 & fitted with exhaust fan for ventilation.

475 VOL: II-D, Section-I 13.01.06, Page 28 Following type tests shall be performed on one of each rating of transformer/switchgear/Motors, Battery system even if type test certificates of these tests are submitted for Owner’s acceptance.

Owner reserves the right to demand for repetition of all /some of the type tests at the contractor’s cost in presence of his representative, even if the tests have already been conducted.

We understand that bidder has to conduct type tests on one of each rating of transformer/switchgear/motors, battery system in presence of client representative at manufacturer's works, even if the type test have already been conducted.

Kindly confirm.


476 VOL: II-D, Section-II 6.01.03, Page 4 Motor located in hazardous area shall have flameproof enclosure conforming to IS: 2148 /Equiv

In line with standard engineering practice, we do not envisage flameproof motors for bidder's scope of work.

Kindly confirm.


477 VOL: II-D, Section-II 6.07.02, Page 5 Terminal box shall be capable of being turned 360 deg C in steps of 90 deg C, unless otherwise approved

Kindly note that LT motors TB shall be capable of being turned 360 Deg C in steps of 90 Deg C.

However, HT motors TB shall be capable of being turned 360 Deg C in steps of 180 Deg C.

Kindly confirm.

Noted.

478 VOL: II-D, Section-III 3.01.02, Page 2 The switchgear enclosure shall conform to the degree of protection IP-4X

479 VOL: II-D, Section-I 11.01.00, Page 26 11.01.00 a) VT/relay compartment : IP 52

480 VOL: II-D, Section-III Annexure-A, 1.1, Page 5 Internal Arc Classification : IAC AFLR We request client to specify the IAC fault current and and the duration.


481 VOL: II-D, Section-III Annexure-B, Page 20 Bus differential protection relay (87B) shall be provided and all live parts of the Switchgear shall be covered within the differential protection zone. (optional)

In line with standard engineering practice, we do not envisage bus differential protection for HT switchgear in our scope of work.

Kindly confirm.


482 VOL: II-D, Section-III 3.08.04.01, Page 7 Energy accounting and audit meters:The energy accounting and audit meters shall be suitable for measurement, recording and display of cumulative active energy with date and time. The meter shall have accuracy class of 0.2S483 VOL: II-D, Section-I 2.05.01, r i), Page 5 i) Audit metering in LV side of the each distribution transformer.

484 VOL: II-D,Section-IV 3.13.00, Page 2 Soft starters shall be installed depending upon the requirement.

We do not envisage any soft starters in bidder's scope of work.

Kindly confirm.


In line with standard engineering practice, we envisage IP 5X for 415V PMCC/MCC rated below 1600A and IP 42 for 415V PMCC/MCC rated 1600A and above.

In line with CL. 3.01.02 of Section-III, we envisage HT switchgear enclosure protection as IP - 4X.



Noted.

In line with CL. 2.05.01, r i), we envisage audit meter at LV side of each distribution transformer.

Kindly confirm.

485 VOL: II-D,Section-IV 3.20.00, Page 3 The PMCC/MCC & Distribution Boards will be provided with 20% of outgoing feeders of each type as spare subject to a minimum of one number of each type and rating in addition to any specific spare feeders requirement of owner to be furnished during detail engineering

As number of feeder requirement for owner's is not there, we do not envisage feeders for owner's system.

we request client to specify the feeders requirement for owner in each switchboard, if any.

Owner's specific requirement shall be covered within the "20% of outgoing feeders of each type as spare subject to a minimum of one number of each type and rating".

486 VOL: II-D, Section-IV 3.20.00, Page 3 For feeder ratings of 630 A and above ACB shall be provided. For feeders less than 630A, MCCB/SFU shall be provided depending on the application. 487 VOL: II-D,Section-IV Annexure-C, Page 25 Outgoing feeder : ACMCCB rating

488 VOL: II-D, Section-IV Annexure-C, Page 25 PMCC/MCCs in general shall be of single-front construction unless Owner approves double front construction at execution stage due to any constraint in specific areas.

We envisage PMCC ( all are circuit breakers) as single front construction. However, we request client to accept double front MCC and ACDB.

Kindly confirm.


489 VOL: II-D, Section-IV 4.22.01, Page 16 Load-break switches shall be four-pole, air break, heavy-duty type. Duty class of load-break switches shall be AC-23 for motor feeders. Motor feeder switches shall be capable of safely breaking the locked rotor current of the associated motor circuit.

We envisage load isolating switch unit for equipments such as EOT crane, hoist, elevator only.

We do not envisage any isolating switch unit for process equipments.

Kindly confirm.

Will be finalized during detail engineering.

490 VOL: II-D,Section-IV Annexure-B, 1.10, Page 22

Termination details Incomer for PMCC-1 : Through bottom entry cable

Kindly note that Cable termination will be from bottom entry and bus duct termination will be top/side entry.

Kindly confirm.


491 VOL: II-D,Section-IV Annexure-B, Note : 4, Page 24

Cable sizes are indicative. Sizes shall be subject to validation by design calculation as per stipulation of Specification.

We understand that cable size will be based on cable sizing calculation only.

Kindly confirm.


492 VOL: II-D, Section-IV 3.07.00, Page 2 The rating established shall be taken into account, load variations during the course of engineering. Due consideration for reduction in capacity due to transformer regulation shall be given.. 20% spare margin shall be considered while calculating the total load on the L.T. board.493 VOL: II-D, Section-I 7.03.01, Page 20 Each transformer shall be sized to cater 100% maximum demand load + 10% design margin.

494 VOL: II-D, Section-VI 4.01.01, Page 2 Transformers shall be housed in enclosure unless otherwise specifically stated in the Annexure. The enclosure shall be fabricated from sheet steel of minimum 2 mm thick and having IP33 degree of protection for indoor installation and IP43 degree of protection for outdoor installation.

In line with CL. 3.20.00, we envisage SFU for the outgoing feeders rated up to 630A.

Kindly confirm.

MCCB in line with the specification shall be used.



Since transformer secondary voltage is selected based on transformer regulation, we envisage 20% spare margin while calculating the total load on the LT board. Accordingly LT service transformer rating will be selected.

We have not envisaged further 10% design margin while selecting transformer rating. Since all the LT transformers are dry type and located indoor, we request client to accept enclosure degree of protection as IP: 23.

Kindly confirm.

495 VOL: II-F, Electrical Dwg.13L16-DWG-E-0101, Note: 3

All the LT transformers are dry type.

496 VOL: II-D, Section-VIII 3.02.03, Page 4 Battery racks for supporting battery cells shall be constructed of best quality structural steel frames (Ni-Cd battery), forming a rigid structure.

We envisage batteries located in two tier arrangement.

Kindly confirm.

Will be finalised during detail engineering.

497 VOL: II-D, Section-IX 2.02.01, Page 2 The emergency lighting load shall comprise at least 10% of the normal lighting load.

498 VOL: II-D, Section-IX 2.02.02, Page 2 On failure of normal A.C. supply, emergency A.C. lighting shall be provided in selected areas for general visibility, safe movements and operation of important auxiliaries

499 VOL: II-D, Section-IX 2.02.01, Page 2 The emergency lighting load shall comprise at least 10% of the normal lighting load.

In line with CL. 2.02.02, we envisage emergency AC lighting for general visibility, safe movements and control rooms.

Kindly confirm.


500 VOL: II-D, Section-IX 2.04.05, Page 4 Voltage drop at the fixture from the MLDB bus shall not exceed 3%

In case of conveyor gallery lighting, we request client to accept maximum voltage drop from MLDB to fixture is limited to 5%.

Kindly confirm.


501 VOL: II-D, Section-IX 3.06.01, Page 6 Each Distribution Board shall consist of one dry type transformer housed in the cubicle voltmeter with selector switch, C.T. operated ammeter and incoming triple pole switch/MCCB.

We understand that each MLDB is provided with 1X100% incomer and 1 No of dry type transformer.

Kindly confirm.


502 VOL: II-D, Section-IX Annexure-B, Page 23 k) Emergency Lighting We understand that referred clause is applicable for DC emergency lighting.

Kindly confirm.


503 VOL: II-D, Section-XV 2.01.03, b), Page 1 The minimum conductor section is determined on the basis of ground fault current. This section is then increased by an allowance to account for the soil corrosion loss of 0.3 mm per year over the design life of 30 years

We envisage corrosion allowance based on soil resistivity value and corrosion allowance as per CBIP instead of 0.3mm over the design life of 30 years.

Kindly confirm.


504 VOL: II-D, Section-XV 2.01.03, d), Page 1 The ground grid conductors shall be buried in earth at a minimum depth of 1000 mm.

We envisage ground grid conductor buried at depth of 0.6m.

We request client to accept the same.


515

II-B,IA 1.00.00 , Page 11 of 19

With present configuration in a parallel conveyor streams whether 1 or both the conveyors will run simultaneously for the below routings : a) From Receiving Pit complex to Over ground Bunkers,b) From Over Ground Bunker to Rapid Loading System,




Since all the LT transformers are dry type and located indoor, we request client to accept enclosure degree of protection as IP: 23.

Kindly confirm.

In line with CL. 2.02.02, we envisage emergency AC lighting for general visibility, safe movements and control rooms.

Kindly confirm.

517II-B,IA 2.02.00, Page 13 of 19

Please specify whether any Liner to be provided for Over Ground Bunker.

50 mm thick guniting liner shall be provided for ground bunker.

519Part III

Price bid formatsPage 18 of 65

Idlers Idlers of 1800 mm belt width only mentioned & for other belt width spares is not mentioned. Please confirm.

Please refer clause no: 24.00.00 of V II B, S-I

520 Part IIIPrice bid formats

Page 19 of 65Vibrating Feeder Vibrating feeder is not applicable. Please confirm Owner's Techincal Specification shall prevail

522 Part IIIPrice bid formats

8, Page 25 of 65Rack & Pinion Gate Rack & Pinion Gate is not applicable. Please confirm Owner's Techincal Specification shall prevail

523Vol-IIBSec-1A

2.03.01, Page 14 of 19

The RLS system shall include Steel surge hopper of 500T capacity & 70Te pre-weigh bin

Please confirm the capacity mentioned is for each hopper.


524

Vol-IIBSec-1A

2.03.03, Page 15 of 19

Coal Sampling UnitCommon facility for crushing by primary, secondary & tertiary crushers to sample size (-)3mm

Bidder propose to provide two stage crushing as it will be sufficient.


526Vol-IIBSec-1A

2.05.02, Page 17 of 19

Adequate number of electrically /Pneumatic operated flap gates with manual over ride to be installed in various bifurcating chutes.

Please confirm that bidder can provide either electric or pneumatic operated flap gates.


527

Vol-IIBSec-IB

5.02.03, Page 13 of 32

Suitable distance (fixing centre) shall be kept for conveyor / galleries having 1800 mm belt width.

Walkway dimensions provided for 1800 mm belt width only whereas for 1600 mm dimensions are not mentioned., Please specify.

For twin conveyor gallery each side walkway shall be 800 mm and central walkway shall be 1100 mm. This clear dimensions shal be followed for all conveyor gallaries.

529Vol-IIBSec-IB

7.00.00, Page 15 of 32

PRIMARY & SECONDARY TWIN SHAFT SIZER Bidder propose to provide roll crusher instead of sizer as it will be adequate & also for sizers only limited vendors are available.


530Part III

Price bid formatsPage 18 of 65

Table 1: Mandatory Spares for Coal Handling Plant Both clauses are contradictory. List of Mandatory spares for complete package will be followed as per price schedule. Please confirm.

A comprehensive list of mandatory spares will be provided.

531 Vol-IIBSec-IB

24.00.00, Page 31 of 32LIST OF MANDATORY SPARES (MECHANICAL)

532 Dumpers Please confirm Discharge dumpers are not in the scope of Bidder.

Noted.

533 Lab Equipments Please confirm any laboratory equipments not in the scope of Bidder as any list is not provided.

Lab equipments are in the scope of bidder

534 Fire Protection system

538

II B, V 2.01.00, Page 4

Receiving Pit Complex Bidder is not considering HVW spray system in the Receiving Pit Complex because of no oil filled transformers considered (10 MVA & above). Please confirm.


539

II B, V 2.01.00,Page 4

CHP Substation & Control Room /Control Equipments Room area

This substation called as RLS substation. Please confirm. If, confirm bidder is not considering HVW spray system because of no oil filled transformers considered (10 MVA & above) .


540

II B, V 2.01.00,Page 4

CHP Substation, Switchgear Room & Control Room Area

This substation called as Main substation. Please confirm. If, confirm bidder is considering HVW spray system for Transformers (10 MVA & above).


541

II B, V 2.02.01,Page 5

Hydro-pneumatic tank along with electric motor driven jockey pumps and compressors with drive motors.

Bidder is considering Air vessel with electric motor driven jockey pumps . Not considered Hydro-pneumatic tank and compressors with drive motors. Please confirm.


542

II B, V 3.01.00, Page 7

The reservoir will be partly underground and partly aboveground

As per TAC Rules 7.4.1.11 & 7.4.1.12 is not permitted party positive and party negative pump installation. So bidder is considering reservoir & pump house will be above ground only. Please confirm.

Noted.

543

II B, V 3.01.01, Page 9

In places where the pipes are required to be buried proper treatment for corrosion protection (wrapping and coating) shall be given.

Bidder is considering underground pipe shall be properly lagged with corrosion protective tapes of minimum thickness of 4 mm (in two layers) of coal tar type as per IS:15337 or AWWA C 203. Please confirm.


544

II B, V 3.01.02, Page 9

All the water spray system pipes are tapped from hydrant network.

Bidder is considering common header for hydrant and spray system. Spray system (HVWS/ MVWS) shall be tapped from hydrant header only. Please confirm.

Separate headers for hydrant and spray System as shown in the tender flow diagram shall be considered.

545

II B, V 3.02.00, Page 10

Portable Fire Extinguishers Bidder is considering Fire Extinguisher performance and construction standard as IS:15683. Please confirm.


546II B 2.03.0, Page 1

Rated speed (RPM) -1500 Bidder is considering Jockey pump rated speed (RPM) as 2900. Please confirm.

Noted.

547

II B, V A / DS 3.01.01, Page 1

Fire water pump - Preferably Horizontal split casing Bidder is considering Fire water pump type as End suction back pull out centrifugal horizontal pump, because of space constraint in the pump house. Please confirm.


551

13L16-DWG-M-FW-PI-001 / R0 (Flow diagram

for Fire water supply system)

Fire water tank capacity - 2000 m3 As per TAC, Fire water storage tank capacity is sufficient 1092 m3 (2 nos common for hydrant / spray system (TAC FP manual Cl.No:7.3 .6,Table-1)No of working pumps (2 nos) X Pump capacity (273 m3/hr) X Working hours (2 hrs) = 1092 m3 . But as per flow diagram mentioned tank capacity 2000 m3 (for each compartment 1000 m3). Bidder is considering Fire water storage tank capacity 1092 m3 (for each compartment 546 m3). Please confirm.


552 HVAC

553

VOLUME : II-B SECTION-III 3.00.00

Outdoor Ambient Conditions:

Not specified

Bidder proposing outdoor conditions as per below, please confirm

Ref:ISHRAE HandbookHimgiri nearest Location : Rourkela/SambalpurSeason DB (Deg.C) WB (Deg.C) RH (%)Summer 43 25.6 24Monsoon 30.6 27.8 80Winter 12.2 6.7 41

Owner's Techincal Specification shall prevail.

554


Air Conditioning System (Split type air conditioning units):

The evaporating indoor unit will be suitable for ceiling mounting or wall mounting. The other unit consists of compressor & Condenser shall be floor-mounted type.

1) As per specification, bidder presumed the “Split type air conditioning units” is refers to Hi wall commercial split air conditioner.2) Bidder considering 3-star rating split Air conditioner.3) Bidder shall be considering split air conditioners in the range of 0.5, 1, 1.5 ,2.0 & 2.5 TR. The total cooling load shall be divided into number of split units.4) No stand by envisaged.5) Outdoor units shall be either floor or wall mounted type.Please confirm.

All air conditioners are to be given as per the heighest BEE star rating.While selecting the unit Bidder has to consider the dehumified air quantity reuirement also.

For other points, Owner's Specification shall prevails

555



The unit shall have nominal rating capacity to maintain inside dry bulb temperature of 24ºC ± 1ºC & R.H. around 50% ± 5%. The unit shall be suitable for the operating conditions as mentioned under site condition.

RH cannot be controlled with Split air conditioners.Please Confirm.

Accepted.

556



Fresh air shall be inducted to the air re-circulation system @ 34 CMH per person or 1 Air Change per hour or Ex-filtration through room, whichever is higher..

Fresh air can be mixed with room air through door opening and closing, however in general at industrial areas split air conditioning system not envisaged with fresh air supply system. So bidder is not considering fresh air arrangement with Split AC.Please confirm.

Confirmed.

557


Ventilation System:Switch Gear/ MCC Rooms shall be provided with Dry Type Pressure Ventilation System (2mmwc).

1) Bidder considering Switch Gear/ MCC Rooms dry type pressure ventilation system by using required number of wall mounted supply air Tube Axial fans with pre& fine filter arrangement and air exhaust through gravity dampers. 2) No ducting envisaged for air distribution.Please confirm.

Accepted with pressure ventilation( 2mm wc) System.

558


Ventilation System:Exhaust air grills with VCD shall be provided for the battery rooms

1) Bidder considering, Axial Flow Fans for Battery Rooms either bifurcated or belt driven type with spark proof construction.2) Axial Flow Fans for Battery rooms will have flameproof motors.3) Air intake through wall/door mounted fixed grills.4) Exhaust air grills not considered.

Please confirm.

Accepted except belt driven type.

Documents

RESPONSE TO TECHNICAL QUERIES FOR THE WORK · PDF file · 2017-02-04Sl No Tender Specification Reference Clause No. & Page No. Description As per RFP Query By Bidder OCPL's Response