FOR NORTH GOA MECON LIMITED Tender Doc. No.: … · 2019-07-29 · 2) Fittings thickness shall be...

CORRIGENDUM #1

for

Date: 02.11.2018

LAYING & CONSTRUCTION OF 8”, 6” & 4” NB U/G STEEL PIPELINE NETWORK & ASSOCIATED WORKS FOR CITY GAS DISTRIBUTION

FOR NORTH GOA

MECON LIMITED Tender Doc. No.: 05/51/23SA/GNGPL/001-ii

Owner : GNGPL

Sl. Description Volume

Tender Page Clause / Para Amendment / Addition / Modification / Deletion

No. No. / Section

The description of item no. 21.2 of Mainline in SOR stands modified as per following:

1 Schedule of Rates I 417 Mainline SOR Modification 8"x6"x4" to be read as 8"x8"x4" .

TS & Datasheet of Split Tee - - Addition TS & Datasheet of Split Tee enclosed herewith as Annexure-1.

2 I & II

- - Addition Specification of Hot Tapping enclosed herewith as Annexure-2.

3 Specification of Hot Tapping II

P&ID and tentative Route

- - Addition P&ID and tentative Route diagram for Piping Work enclosed herewith as Annexure-3.

4 III

diagram for Piping Work

5 Drawing for installation of PG

III - - Addition Drawing for installation of PG standard no. MEC/05/E5/SD/PG/004 enclosed herewith as Annexure-4.

6 Works related to telecom

I, II & III - - Deletion Works related to telecom part like OFC laying, Duct laying etc. are excluded from scope of work of this tender.

TENDER DUE DATE & 8, 9 & 14 9.6, 9.7 & 9.12 Amendment Clause 9.6 & 9.7 of IFB Stands modified as below:

TIME, of IFB, Cut-out Last Date & time for Submission shall be: 13.11.2018 by 15.00 Hrs “Indian Standard Time (IST)”

BID OPENING DATE & Slip for Physical Date & time for opening of Techno-commercial Part shall be: 13.11.2018 at 16.00 Hrs “Indian Standard Time (IST)”.

7 TIME

I documents

(TECHNO-COMMERCIAL Accordingly, Sale of tender documents (9.12 of IFB) shall be till: 13.11.2018 by 1400 Hrs. “Indian Standard Time (IST)” and bid due date &

PART)

time on cut-out Slip for Physical documents to be read as "13.11.2018 by 15.00 Hrs."

& SALE OF TENDER

DOCUMENTS

8 Reply to Pre-bid Queries

Clarifications Reply to Pre-bid queries is enclosed herewith as Annexure-5.

Dr. P. K. Sharma DGM (Contracts) MECON, Delhi

Note: Any addendum/corrigendum/clarifications shall be integral part of the Bidding Documents and shall be submitted by bidders duly signed & stamped in their bid.

of 1

ANNEXURE ‐1

DATA SHEET FOR SPLIT TEE

Sl.No. DESIGN DATA

1 Type of Fitting 8" x 4" Reduced Branch Split Tee

2 ANSI Rating 300#

3 Quantity As per SOR

4 Design Code ASME B31.8

5 Design Pressure 49 kg/cm2

6 Design Temperature (°C) (-)29 to 65

7 Corrosion Allowance (mm) 1.5

8 Design Factor (F) 0.5

9 Flange Facing RF

10 Flange Finish 125 AARH

11 Branch End BW (MSS-SP-75)

12 PWHT Yes (in accordance with code) @

13 Field Test Pressure 74 kg/cm2

14 a) Existing Pipeline Details (on which hot tapping is to Outside Diameter : 8"NB

be conducted) Thickness : 6.4 mm

Material : API 5L Gr. X-52

Finalizing at the time of execution.

b) Connecting Branch Pipeline Details Outside Diameter : 4"NB

Thickness : 6.4 mm

Material : API 5L Gr. X-52

15 Type of Valve to be used on the branch Full Bore Ball Valve

16 Product Handled Natural Gas

17 Sleeve, OD - dia. A(mm) @

18 Sleeve, Thickness - T1(mm) @

19 Sleeve, Length - L(mm) @

20 Branch, OD - dia. B(mm) @

21 Branch, Thickness - T2(mm) @

22 Fitting Height (center line of run pipe to flange top) - H(mm) @

23 Flange, OD - dia. C (mm) @

24 Split Tee, Weight (kg) @ 25 MATERIAL REQUIREMENT

Sl.

Part Description Specified Material Offered Material

No. by Bidder

1 Full Enclirelement Sleeve - Top Portion MSS-SP-75, Gr. WPHY-52 / A-537Cl.1 / ASTM A 707 L3 CL3 or equivalent. @

2 Full Enclirelement Sleeve - Bottom Portion MSS-SP-75, Gr. WPHY-52 / A-537Cl.1 / ASTM A 707 L3 CL3 or equivalent. @

3 Branch MSS-SP-75, Gr. WPHY-52 / A-537Cl.1 / ASTM A 707 L3 CL3 or equivalent. @

4 Lock-O-Ring Flange N.A @

5 Lock-O-Ring Assembly with Guide Bars N.A @

6 Lock-O-Ring/ Retaining Device N.A @

Notes @ Bidder to indicate

1) Split Tee shall be manufactured, tested and supplied in accordance with Spec. No. MEC/TS/05/21/011A, R0 2) Fittings thickness shall be calculated based on pressure corresponding to ANSI 300# and considering design code, design factor and corrosion

allowance indicated above. Calculation in this respect shall be submitted by vendor for review/ approval of Purchaser/ Consultant.

3) The fitting shall be capable of withstanding field hydrostatic test pressure indicated above or 90% of SMYS of fitting material which ever is more. 4) Requirement of impact test & hardness as per Specification No. MEC/TS/05/21/011A, R0 shall be applicable for the Fittings & Flange material. 5) Vendor shall submit Inspection & Test Plan for approval within two weeks from date of order.

REV. NO. ZONE DESCRIPTIONS BY APPRD

REVISIONS REFERENCES DRG. NO.

SECTION OIL & GAS CLIENT : GNGPL

DATE CHKD DATE MECON LIMITED

DSGN AM 29.10.18 HK PROJECT : CNG & CITY GAS DISTRIBUTION

DRWN FOR NORTH GOA Sheet 1 of 1 REV

APPROVED

A K GUPTA SPLIT TEE SCALE : 0

DATA SHEET NO. : MEC/05/28/M/002/23SA/DS/ST/011A/01

Edition : 1

SPECIFICATION

FOR

SPLIT TEE

(HOT TAP MATERIAL)

SPECIFICATION NO.: MEC/TS/05/21/011A

(OIL & GAS SBU)

MECON LIMITED

DELHI 110 092

MECON LIMITED STANDARD TECHNICAL SPECIFICATION

REGD. OFF: RANCHI

834002 OIL & GAS SBU, DELHI

DOCUMENT NO. Page 1 of 1

TITLE SPLIT TEE (HOT TAP MATERIAL) MEC/TS/05/21/011A REVISION : 0

EDITION : 1

C O N T E N T S

Sl.No. Description

1.0 SCOPE

2.0 REFERENCE DOCUMENTS

3.0 MANUFACTURER'S QUALIFICATION

4.0 MATERIALS

5.0 DESIGN AND CONSTRUCTION REQUIREMENTS

6.0 INSPECTION AND TESTS

7.0 TEST CERTIFICATES

8.0 PAINTING, MARKING AND SHIPMENT

9.0 WARRANTY

10.0 DOCUMENTATION

PREPARED BY: CHECKED BY: APPROVED BY: ISSUE DATE :

(Amit Lavania) (A.K. Gupta) (A.K. Johri) April, 2009


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EDITION : 1

1.0 SCOPE

This specification covers the basic requirements for the design, manufacture

and supply of carbon steel split tees as hot tap material to be installed in

pipeline system for handling hydrocarbons in liquid or gaseous phase.

2.0 REFERENCE DOCUMENTS

2.1 Reference has also been made in this specification to the latest edition of the

following codes, standards and specifications :

a) ASME B 31.4 : Liquid Transportation Systems for Hydrocarbons,

Liquid Petroleum Gas, Anhydrous Ammonia and

Alcohols.

b) ASME B 31.8 : Gas Transmission and Distribution Piping System

c) ASME B 16.9 : Factory made wrought steel butt welding fittings.

d) ASME B 16.25 : But Welding Ends

e) ASME Sec. VIII : Boiler & Pressure Vessels Code-Rules for the

construction of pressure vessels.

f) ASME Sec. IX : Boiler & Pressure Vessel Code-Welding & Brazing

Qualifications.

g) ASTM A 370: Mechanical Testing of Steel Products

h) MSS-SP-53: Quality Standard for Steel Castings and Forgings for Valves,

Flanges and fittings and other Piping components and

- Magnetic Particle Examination Method.

i) MSS-SP-75: Specification for High Test Wrought Butt Welding Fittings

j) API 1104: Specification for Welding Pipeline and Related Facilities

k) SSPC-VIS-1: Steel Structures Painting Council


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EDITION : 1

2.2 In case of conflict between the requirements of this specification and any code,

Standard and Specification referred in Clause 2.1 above. Order of precedence shall be

as follows :

• Data Sheets

• This Specification

• Other Referred Codes & Standards

• Manufacturer’s Standard.

3.0 MANUFACTURER'S QUALIFICATION

Manufacturer who intend bidding for fittings must possess the records of a

successful proof test, in accordance with the provisions of ASME B16.9/ MSS-

SP-75. These records shall be submitted at the time of bidding when specified

in data sheet.

4.0 MATERIALS

4.1 The basic materials required for manufacturing of split tees have been indicated

in the data sheet. Other additional materials required for manufacturing split

tees shall be as per manufacturer's standard suitable for the service conditions

indicated in data sheet and shall be subjected to approval by Purchaser.

4.2 Fully killed Carbon steel shall be used in the manufacture of split tees.

4.3 Each heat of steel used for the manufacture of pressure containing parts of the

flow tees shall have carbon equivalent (CE) not greater than 0.45 calculated

from the check analysis in accordance with the following formula.

CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni +Cu)/15

Carbon content on check analysis shall not exceed 0.22%.

4.4 When specified in Data sheet, Charpy V-notch test shall be conducted for each

heat of steel used in manufacture of split tee. Test shall conform to the

provisions of ASTM A-370 and at a temperature of 0°C. The Charpy impact test

specimen shall be taken in the direction of principal grain flow and notched

perpendicular to the original surface of the plate or forging. The average

impact energy values of three full sized specimens shall be 27 joules, unless

indicated otherwise in the data sheets :

Minimum impact energy value of any one specimen of the three specimens

analysed shall not be less than 80% of the average inpactenargy specified. No

specimen shall exhibit less than 80% shear.


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EDITION : 1

When Low Temperature Carbon Steel (LCTS) materials are specified in Datasheet or

offered by Manufacturer, the Charpy V-notch test requirements of applicable material

standard shall be complied with.

4.5 When specified in the data sheet, hardness test shall be carried out as per

ASTM A 370 for each heat of steel used. A full thickness cross section shall be

taken for this purpose and the maximum hardness of base metal, weld metal

and HAZ of all pressure containing parts shall not exceed 248 HV10, unless

otherwise specified.

5.0 DESIGN AND CONSTRUCTION REQUIREMENTS

5.1 Split tees shall be designed and manufactured in accordance with the provisions

of codes and standards referred in Section 2.0 of this specification. Design

factor and corrosion allowance indicated in data sheet shall be taken into

account for design of split-tees.

5.2 Split tees shall generally conform to the figure shown in the data sheet and

shall meet following requirements as minimum :

a) Sleeves shall be designed to meet pressure & reinforce requirements of

ASME Codes.

b) Fittings shall be manufactured with controlled carbon equivalent for its

welding in harsh out side environments.

c) Split tee shall be of full branch or reducing branch & meet the

requirement for fittings with hot tap machine.

5.3 Butt weld ends shall be beveled as per MSS-SP-75/ B16.25.

5.4 Split tees shall be manufactured by hot drawn, full branch/ reduced branch

opening, snug-fitting sleeve or fabricated full size nipple, branch outlet welded

to snug-fittings sleeve.

5.5 All welds shall be made by welders and welding procedures qualified in

accordance with ASME Section-IX. The welding procedure qualification test shall include charpy impact test and hardness test and shall meet the requirements

of clause 4.4 and 4.5 of this specification respectively.

5.6 Repair by welding on parent metal is not allowed. Repair of welds shall be

carried out only after specific approval by Purchaser's Representative for each

repair. The repair welding shall be carried out by the welders and welding

procedures duly qualified as per ASME Section-IX and records for each repair

shall be maintained.


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EDITION : 1

6.0 INSPECTION AND TESTS

6.1 The manufacturer shall perform all inspections and tests as per the

requirements of this specification and the relevant codes, prior to shipment, at

his works. Such inspection and tests shall be, but not limited to the following :

6.1.1 All split tee shall be visually inspected.

6.1.2 Dimensional checks shall be carried out as per the approved drawing.

6.1.3 Chemical composition and Mechanical properties shall be checked as per MSS-

SP-75 and this specification for each heat of steel used.

6.1.4 Non destructive examination of individual split tees shall be performed as given

below:

a) 100% inspection by radiography shall be carried out on all pressure

containing welds on fittings. Acceptance limits shall be as per API 1104.

b) Welds which in Purchaser's Representative's opinion cannot be inspected

by radiographic methods shall be checked by ultrasonic or magnetic

particle methods. Acceptance criteria shall be as per ASME Section VIII

Appendix-12 and Appendix-6 respectively.

c) All finished weld ends shall be 100% ultrasonically tested for lamination

type defects for a distance of 50mm from the end. Any lamination larger

than 6.35mm shall not be acceptable.

d) All forgings shall be wet magnetic particle examined on 100% of the

forged surfaces. Method and acceptance shall comply with MSS-SP-53.

6.2 Purchaser's Representative shall also perform stagewise inspection and witness

tests as indicated in clause 6.1 at manufacturer's works prior to shipment. Manufacturer shall give reasonable notice of time and shall provide without

charge reasonable access and facilities required for inspection, to the

Purchaser's Representative.

Inspection and tests performed/ witnessed by Purchaser's Representative

shall in no way relieve the Manufacturer's obligation to perform the required

inspection and tests.


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EDITION : 1

7.0 TEST CERTIFICATES

7.1 Manufacturer shall submit following certificates to Purchaser's Representative :

a) Test certificates relevant to the chemical analysis and mechanical

properties of the materials used for construction as per this specification

and relevant standards.

b) Test reports on radiographic and ultrasonic inspection and wet magnetic

particle examination.

c) Certificates for each split tee stating that it is capable of withstanding

without leakage for a test duration of 15 minutes and test pressure

which results in a hoop stress equivalent to 95% of the specified

minimum yield strength.

d) Test reports on heat treatment carried out.

8.0 PAINTING, MARKING AND SHIPMENT

8.1 Split tees entire surface shall be thoroughly cleaned, freed from rust and grease

and applied with sufficient coats of corrosion resistant paint, after all the

required tests have been performed and accepted by Purchaser's

Representative. The surface preparation shall be carried out by shot blasting to

SP 6 in accordance with "Steel Structures Painting Council - Visual Standard -

SSPC-VIS-1".

8.2 Manufacturer shall indicate the type & recommended coats of corrosion

resistant paint used, in the drawing submitted for approval.

8.3 Split tees shall be marked with indelible paint with the following data :

a) Manufacturer's Name

b) Nominal diameter in mm D1 x D2

c) End thickness in mm T1 x T2

d) Material

8.4 Split tees shall be suitably protected to avoid any damage during transit.

Metallic or high impact plastic bevel protectors shall be provided for weld ends.


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EDITION : 1

9.0 WARRANTY

Purchaser will be reimbursed by Manufacturer for any Split tee furnished to this

specification which fails under field hydrostatic testing and if such failure or

non-performance is caused by a defect in the Split tees which is outside the

acceptance limits of this specification. The reimbursement cost shall include

cost of Split tee, labour and equipment rental for finding, excavating, cutting,

and installation of replaced Split tee in position.

10.0 DOCUMENTATION

10.1 At the time of bidding, bidder shall submit the following documents :-

a) General arrangement drawing of split tees with overall dimensions and

b)

cross sectional drawings.

Reference list of previous supplies of split tees of similar specification

with relevant details viz Project, Year of supply, Client, size, Rating and

c)

service for the last five years.

Clausewise list of deviation from this specification, if any.

d) Records of successful proof test for tees qualifying the range of sizes

e)

quoted.

Brief description of the manufacturing, heat treatment and quality

f)

control facilities of the manufacturer’s work.

Quality Assurance Plan (QAP) enclosed with this tender duly signed,

stamped and accepted.

10.2 Within two weeks of placement of order, the manufacturer shall submit four

copies, of but not limited to, the following drawings, documents and

specifications for approval.

a) Fabrication drawings and relevant calculations for pressure containing parts.

b) Calculation for fittings thickness. c) Method of manufacture, welding procedure and heat treatment details. d) Quality control Manual.

Once the approval has been given by Purchaser, any change in design, material

method of manufacture shall be notified to Purchaser whose approval in writing

of all changes shall be obtained before the Split tees are manufactured.

10.3 Within four weeks from the approval date Manufacturer shall submit one

reproducible and six copies of the approved drawings, documents and

specification as stated in clause 10.3 of this specification.


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EDITION : 1

10.4 Prior to shipment, Manufacturer shall submit one reproducible and six copies of

test certificates as listed in clause 7.0 of this specification.

10.5 All documents shall be in English Language.

ANNEXURE ‐2

Edition : 1

STANDARD SPECIFICATION

FOR

HOT TAPPING

SPECIFICATION NO.: MEC/S/05/28/17

(OIL & GAS SBU)

MECON LIMITED

DELHI 110 092


REGD. OFF: RANCHI



TITLE HOT TAPPING MEC/S/05/28/17 REVISION : 0

EDITION : 1

C O N T E N T S

Sl.No. Description

1.0 SCOPE

2.0 REFERENCE CODE

3.0 MATERIALS

4.0 PROCEDURE

5.0 WELDING

6.0 INSPECTION AND TESTING

7.0 CUTTING OPERATION

8.0 COMPLETION

9.0 DOCUMENTATION

PREPARED BY: CHECKED BY: APPROVED BY: ISSUE DATE :

(Shalini Singh) (Sunil Kumar) (A.K. Johri) Jan. 2009


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EDITION : 1

AMENDMENT STATUS

Sl. Clause / Paragraph / Page Rev. Date By Verified

No. Annexure / Exhibit / No.

Drawing Amended Name

Sig. Name Sig.


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EDITION : 1

1.0 SCOPE

This specification covers the minimum requirements of safety, procedure and equipment for

hot-tapping work to be carried out on carbon steel pipelines or vessels containing flammable

hydrocarbons.

This specification is not intended to be all inclusive, and the use of guidelines set forth herein

does not relieve the Contractor of his responsibility of performing the WORK safely and

completing the WORK capable of performing the intended service.

This specification shall be read in conjunction with the conditions of all specifications and

documents included in the CONTRACT between Company and Contractor.

2.0 REFERENCE CODE

The hot-tapping works shall be carried out in accordance with the latest edition of API

Publication 2201 "Procedure for Welding or Hot-Tapping on Equipment containing

Flammables" and this specification. All requirements given in API Publication 2201 as

"recommendatory" shall be considered as mandatory requirements.

In case of conflict between the requirements of API Publication 2201 and this specification,

the requirements of this specification shall govern.

3.0 MATERIALS

All materials shall meet the requirements of specification for pipeline and piping materials,

included elsewhere in the CONTRACT between Company and the Contractor and shall be

suitable for the service and applicable Class Rating for which they are to be used. In case,

the Contractor proposes to modify certain requirements of these specifications specifically to

suit the hot tapping procedure to be adopted, he may do so, after obtaining the Company

approval in writing. In any case, prior Company approval is required for all materials supplied

by the Contractor.

Manufacturer shall submit all the test certificates in respect of the materials supplied as

required by the Company specifications.

4.0 PROCEDURE

The Contractor shall obtain necessary permissions from the concerned authorities for all hot-

works. The Contractor shall ensure that he has requisite permissions from the Competent

Authority as well as valid hot work permit before initiating any work whatsoever.

All taps shall be made using a full-encirclement fitting having a design suitable for

Contractor's proposed procedure.


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EDITION : 1

Prior to starting of work, the Contractor shall submit for Company's approval, a detailed

procedure proposed to be adopted for hot tapping. Such procedure shall contain, but not

limited to, the following details:

- Preparation for hot works, viz., selection of location on pipe or vessel for hot tap,

ultrasonic testing and out of roundness checks to ensure that pipe or vessel at the

hot tap location is suitable for welding, pre-heating (if required) and cutting

operations, etc.

- Method of ensuring and monitoring recommended minimum and maximum velocity of

fluid in the pipeline.

- Method of measurement and maintenance of liquid level in case of hot tapping on

storage tanks.

- Connection details.

- Detailed welding procedure

- Procedure for non-destructive testing of weld and hydrostatic test of assembly

including test pressures, etc.

- Details of all materials and equipment.

- Hot-tapping procedure.

- Safety instructions, and safety measures viz., gas detection tests, tests for presence

of toxic environment, etc., and safety measures for installations, equipment,

personnel, etc.

Any additional requirements deemed necessary by Company or by Authorities having

jurisdiction for execution of any or all phases of the work shall be binding on the Contractor.

The Contractor shall proceed with construction only after obtaining approval of the

procedure from Company in writing.

All necessary gas detection tests shall be conducted by the Contractor to ensure safe

environment.

The Contractor shall carry out all checks as recommended by Hot tapping equipment

manufacturer, before hot-tapping is attempted.


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EDITION : 1

No hot-tapping work shall be performed in adverse conditions of weather, such as rain, fog,

high dusty winds, etc., which may be detrimental to the quality of the work performed.

The exact location of the hot tap on the pipe or vessel shall be carefully identified and

marked in the field and Company's approval shall be obtained.

Adequate safety arrangements shall be made for the protection of adjacent installations,

exposed personnel and equipment.

5.0 WELDING

Methods for welding procedure qualification and qualification of welders shall be prepared

and submitted by the Contractor for Company's review and approval in accordance with

Section IX of ASME Boiler and Pressure Vessels Code. Upon receipt of approval from

Company, the Contractor shall prepare for the tests and conduct them in the presence of

Company's representative. Separate qualification tests shall be carried out for each grade of

steel and each size of weld. All welding shall be carried out by qualified welders and

qualified welding procedures.

The manual arc process of welding using shallow penetration low hydrogen electrodes shall

be used.

Test certificates for each batch of electrodes and other welding materials obtained from the

Manufacturer(s) shall be submitted for the approval of Company. Company reserves the

right to reject such material at any time, in the event these materials do not perform to the

requirements of this specification.

Welds shall be made in the following sequence - longitudinal welds first, then one end

circumferential weld, then the other.

The weld attaching the fitting to the pipe shall be circumferential to the pipe.

The surface to be welded shall be smooth, uniform, free of fins, laminations, tears, scales,

slag, grease, paint and other deleterious materials, which might adversely affect the welding

and its quality.

All weld joints shall be cleaned of slag and other irregularities before the deposition of the

next pass. Defective welds shall be completely removed or repaired in accordance with the

qualified welding procedure before further welding and when instructed by Company.

Prior to commencement of final welding, Contractor shall obtain approval from Company for

proper joint fit-up and alignment.


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EDITION : 1

The heat input shall be controlled during welding operation to prevent undue overheating of

pressurised pipe or vessel.

Tack welds, if allowed, shall be executed as per qualified welding procedure. Defective tack

welds shall be completely removed prior to final welding.

6.0 INSPECTION AND TESTING

Magnetic particle inspection shall be performed for the first pass and after completion of all

welds. In addition, radiographic and/or ultrasonic tests of the welds shall be carried out.

Before cutting operation, the assembly shall be hydrostatically pressure tested to a pressure

not exceeding the internal design pressure in the run pipe. The test pressure shall be

maintained for a minimum period of one hour. Company's representative shall witness and

grant approval on satisfactory completion of the hydrostatic test.

All welds, which, in the opinion of Company, are found to be defective by hydrostatic testing

or by NDT, shall be repaired or cut and re-welded, as directed by Company, and re-tested.

Repair of a repaired weld is not permitted.

7.0 CUTTING OPERATION

Instructions given by the Manufacturer of the hot-tapping machine shall be strictly followed

while installing the machine and during the cutting operation.

Cutting operation shall begin only after all welds have been tested and approved by

Company.

Contractor shall ensure that the full bore bail valve or the sandwich valve is precisely

centered on the tee-connection and is cleaned of ail dirt, etc.

Boring bar of the hot tap equipment shall be run several times through the valve to ensure

that the cutter does not jam or drag.

All bolted joints shall be checked for possible leakage. Packing of hot-tap machine, bleed

valve, bolts of cutter, pilot bit and blank catcher shall be checked before starting the cutting

operation.

After the cutting operation is complete, the boring bar shall be extracted, the valve closed

and the machine shall be depressurised by opening the bleed valve. Machine shall be

dismantled after these operations have been completed and when authorised by Company.

A blind flange shall be provided on the valve after removal of hot tap equipment. In the event

sandwich valve is utilised, the end shall be made with a Lock-O-Ring flange.


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EDITION : 1

8.0 COMPLETION

The hot-tap work shall be considered complete when it has been certified in writing by

Company that all the works have been satisfactorily completed.

The Contractor shall clear-off the area removing all equipment and left over material, etc.

from the job site after completion of the work

9.0 DOCUMENTATION

Documentation to be submitted by Vendor/Contractor to Company is summarized below.

Number of Copies (Hard copies / soft copies etc.) shall be as indicated in CONTRACT

document.

Following documents shall be submitted:

- Hot Tapping Procedure. - General Arrangement Drawings (dimensional drawings) - Sketches of the location (pipeline KP Point) where hot tapping is performed. - Details/data sheet of components including tees, valves etc. including size, rating

and material details.

- Welding Records. - Weld inspection and NDT records.

ANNEXURE ‐3

ANNEXURE‐4

_5 I 4 1 3 1 7 1

—

O F

E E

`—.

LIST OF MATERIALS

QUANTITY ITEM ND. DESCRIPTION SIZE MATERIAL

(NOS. )

A/R 1 TUBE 1/2' S.S

2 7 NIPPLEPL X TH 1/2' S. S_

3 147 FEMALE CONNECTOR 1/ 2 . THx1/ 2'CID S. S

1 22 EQUAL TEE 1/2' S.S

2 39 BALL VALVE SCRD 1/2' S,S

1 51 PLUG 1 / 2' SS

1 15 SWAGE NIPPLE PL XTH 3/4'X 1/2' SS

2 137 MALE CONNECTOR 1/2'THx1/ 2'013 S.S

B B

RE V NO OATS zoNC E DESCRIP 10K5 BY APPRO

RVASR:04 5 InFER134CES DIRG. MO. TI1 COMM t wean Of 103Xat MC ■ MKS 110 IMMO PIN•Ar, .01100111011 1,100:111. 1.15a WI 10 II OWED OR U11211 /OP 011031 IMICUECTS MIMS 1:4111113117 MOW= 11[0011. SECTION • fir VVICAL fiti

A N M( OATSCNK O OATS DSGN R.K.5 P.S INSTALLATION DIAGRAM FOR

DARN !EWAN PRESSURE GUAGE SCALE : NTS

fi-61 s A

MECON LIMITED

Gbh DRG. N O. UEC/05/E5/50/K/0130

I 3 .2

Annexure-5

CGD PROJECT AT NORTH GOA

Reply to Bidder's Queries-I for

LAYING & CONSTRUCTION OF 8”, 6” & 4” NB U/G STEEL PIPELINE NETWORK & ASSOCIATED WORKS FOR CITY

GAS DISTRIBUTION FOR NORTH GOA MECON LIMITED

GOA NATURAL GAS PVT. LTD. Tender Doc. No.: 05/51/23SA/GNGPL/001-ii

Sl. No. Ref. Clause no/ Tender Doc/Page No. Details Query GNGPL/ MECON's Reply

You have mentioned in Item No.- 21.2 size of Branch Pipe & Run Pipe IS

1 21- Hot Tapping Work. Scope of Work in

Page no. 417 of Vol-1 8"x6"x4" with split tee (300#).Please clarify ?

Refer Corrigendum #2.

Mainline. As per my understanding it would be 8"x8"x4" or 8"x8"x6" , please

confirm ?

2 21- Hot Tapping Work.

Scope of Work in Please provide datasheet of Split Tee. Refer Corrigendum #2.

Mainline.


Scope of Work in Please provide specification of Hot Tapping. Refer Corrigendum #2.

Mainline.


Scope of Work in You have mentioned only Two parties for Hot Tapping , so we request Tender condition prevails

Mainline.

you to please add some local parties.

5 Item No-1. Scope of Work in Piping Please provide P&ID for Piping Work. Refer Corrigendum #2.

6 6.0 Field Instruments. Scope of Work in Piping

Please provide drawing for installation of PG standard no. Refer Corrigendum #2.

MEC/05/E5/SD/PG/004.

7 Page no. 573 to 579 of Vol 2 The specification for 3D LR bends is in technical

Please provide Specification of LR Bends. specification no. MEC/TS/05/21/025 of fittings

attached in tender document vol-II.

8 As per our observation there is some Rocky Area in North Goa , So we request you to please add a seperate item for HDD in Rock in your SOR.

The scope in HDD SOR items are for all type of Soil

including Rock.

Note: Any addendum/corrigendum/clarifications shall be integral part of the Bidding Documents and shall be submitted by bidders duly signed & stamped in their bid.

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FOR NORTH GOA MECON LIMITED Tender Doc. No.: … · 2019-07-29 · 2) Fittings thickness shall be...

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Transcript of FOR NORTH GOA MECON LIMITED Tender Doc. No.: … · 2019-07-29 · 2) Fittings thickness shall be...