REPLY TO BIDDERS QUERIES AGAINST TENDER FOR …€¦ · Tender conditions prevail. 13 Cl. No. 10.4 of Spec. No.: MNGL/PL COATING/TS/ 00 The holiday detector shall be a low pulse DC

MAHARASHTRA

NATURAL GAS LIMITED

REPLY TO BIDDERS QUERIES AGAINST TENDER FOR PROCUREMENT OF COATED LINE PIPES FOR CGD PROJECTS OF NASHIK, SINDHUDURG & RAMANAGARA GA OF MNGL, PUNE

BID NO. MNGL/C&P/2019-20/160

Page 1 of 22

Date: 25.02.2020 Replies to Queries of the Bidders

SUB: Replies to queries of the bidders for Tender for Procurement of 10” Coated

Line Pipe for City Gas Distribution Projects of Nashik, Sindhudurg & Ramanagara GA of MNGL, Pune

REF: Bid Document No. MNGL/C&P/2019-20/160 dated 12.02.2020 Dear Sir, Following are the replies to queries of the bidders. Kindly note the same.

Sl.No

Page No. & Clause

Description Clarification MNGL’s Reply

1 Cl. No. 1.0 of Spec. No.: MNGL/PL COATING/TS/00

3 Layer Side Extruded Polyethylene Coating conforming to DIN-30670, 1991.

Bidder has considered the latest version DIN-30670, 2012 to be followed for 3LPE coating. Please confirm.

Agreed


The coating materials Manufacturer shall carry out tests for all properties specified in para 5.3.1 and 5.3.2 for each batch of epoxy, adhesive and polyethylene compound.

All mentioned tests in Cl. No. 5.3.1 & 5.3.2 of client spec. shall be performed by Raw material manufacturer. They will supply Test Certificate for each batch with tested value and typical values. The same to be reviewed to TPI.

Tender conditions prevail.


All materials to be used shall be supplied in sealed, damage free containers and shall be suitably marked with the following minimum information: a. Name of the manufacturer b. Type of material c. Batch Number d. Place and Date of Manufacture e. Shelf Life/ Expiry Date (if applicable) f. Quantity

Bidder clarifies based on confirmation from Adhesive and PE manufacturer that the information required in clause 4.4 points a, b, c and f will be marked on bag whereas others shall be provided through Certificate of Analysis / Batch test certificate. For FBE powder packages marking will be complied.

Agreed

MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

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4 Cl. No. 5.3.1 of Spec. No.: MNGL/PL COATING/TS/00

Epoxy powder properties shall be as per CSA Z245.20.98.

Bidder has considered the latest version CAN/CSA Z245.20-2018. Please confirm.

Agreed

5 Cl. No. 5.3.3 (a) of Spec. No.: MNGL/PL COATING/TS/00

Bond Strength (using Type 2 Test Assembly i.e. Dynamometer)

Bidder proposes to bond strength test shall be carried out type-1 as per Annex D of DIN 30670 due to size constraint. Please confirm.

Agreed

6 Cl. No. 5.3.3 (i) of Spec. No.: MNGL/PL COATING/TS/00

Degree of Cure of Epoxy - ΔTg = (+3/-2)°C

Bidder intent to clarify that the acceptance criteria of ΔTg shall be ≤ 5°C as per latest version CAN/CSA Z245.20-18.

Agreed


All pipes shall provide chemical pre-treatment with phosphoric acid solution. 10% solution of phosphoric acid, Oakite 31 / 33 or equivalent, shall be used to remove all soluble salts and other soluble contaminations.

Bidder clarifies; that it is not feasible to maintain 10% phosphoric acid solution strength consistently. Hence, Bidder will maintain chromate solution strength minimum 10% or as per manufacturer’s recommendation. Please confirm.

Agreed


After the de-ionised water wash, the pipe shall be dried with dry air and preheated to a temperature of 65°C to 85°C.

Bidder understands that after de-ionised water wash, the pipe shall be dried with dry air temperature 65°C to 85°C.



Surface of pipe after abrasive blast cleaning shall have an anchor pattern of 50 to 70 microns (Rz). This shall be measured for each pipe by a suitable instrument such as surface profile depth gauge.

Bidder clarifies that surface roughness criteria range is very narrow. Hence, Bidder proposes surface roughness criteria range between 40-90 micron as per DIN 30670 and use of digital surface roughness profile in accordance with ISO 8503-4.


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NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

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Following completion of abrasive blast cleaning, all pipe surface shall be chemically Pre-treated with a 10% strength chromate solution.

Bidder clarifies that it is not feasible to maintain 10% chromate salutation strength consistently. Hence, Bidder will maintain chromate solution strength minimum 10% or as per manufacturer’s recommendation. Please confirm.

Agreed


The CONTRACTOR shall check that the concentration for the chemical pretreatment solution remains within the range recommended by the chemical manufacturer for the pipe coating process. The concentration shall be checked at the make-up of each fresh solution and once per hour.

Bidder proposes that revise the testing frequency once per shift instead of once per hour.



The extrusion temperatures of the adhesive and polyethylene shall be continuously recorded. The monitoring instruments shall be independent of the temperature control equipment. The instruments shall be calibrated prior to start of each shift.

Bidder clarifies; that such instrument calibrated in specialized equip laboratory, we proposed review of outside lab calibration certificated.



The holiday detector shall be a low pulse DC full circle electronic detector with audible alarm and precise voltage control with DIN VDE 0433 Part 2.

Bidder clarifies; that DIN VDE 0433 Part 2 has been withdrawn. Hence, Bidder will use high voltage Holiday Detector in accordance with Annex E of DIN 30670.

Agreed


Bond Strength Test

The frequency of test for cut back portions shall be one pipe in every fifteen (15) pipes coated and for middle of pipe shall be one pipe in every sixty (60) pipes coated or one pipe per shift whichever is higher.

Bidder proposes to perform the peel test at maximum feasible distance from pipe end instead of middle of the pipe. It is not practically possible to maintain the specified test temperature at the middle of the pipe due to size constraint and safety concern.


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BID NO. MNGL/C&P/2019-20/160

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The system shall disbond/ separate cohesively either in adhesive layer or in polyethylene layer. Majority of the peeled off area on the pipe shall show presence of adhesive. Disbondment/ separation at epoxy to steel interface or epoxy/ adhesive interface or adhesive/ polyethylene interface shall not be permitted. The failure mode shall be recorded for each test.

Bidder proposes cohesive criteria will deviate for grafted adhesive, as describe in ISO 21809-1 table 7, Note C.


16 SOR & MR No. MNGL/LINEPIPE/MR/2020 & Cl. No. 9.2.2 of Spec. No.: MNGL/PL COATING/TS/00

SOR & MR for supply of coated line pipe Total minimum coating thickness: 2.0 mm Cl. No. 9.2.2 of Spec. No.: MNGL/PL COATING/TS/00 In case HDPE material is used as top coat, 10% reduction in minimum coating thickness specified is permissible.

Bidder clarifies that we shall use HDPE material. Hence we have considered total minimum coating thickness as per Cl. No. 9.2.2 of Spec. No.: MNGL/PL COATING/TS/00. Total minimum coating thickness for HDPE material: 1.80 mm.



Irrespective of type of repair, the maximum numbers of repair of coating shall be as follows:

Holiday repair of size ≤ 100 cm2 attributable to process of coating application shall be maximum of one per pipe.

In addition to the above, defects to be repaired by heat shrink patch/sleeve shall be maximum 2(two) per pipe.

Bidder understand that repair generated due to tests is not covered in required criteria


18 CL. No. 6.0 (Table-2) of MR. No.: MNGL/LINEPIPE/MR/2020

Sr. No.

Properties

Frequency (1)

Applicable Requirement

1) Cathodic Disbondment

2 Pipes

Para 5.3.3(h) & 7.5.2(e)(2)

Bidder proposes to CD test shall be performed one pipe two test for PQT (i.e. one sample for 48 hours & one sample for 30 days).


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BID NO. MNGL/C&P/2019-20/160

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2. Two tests each on the selected pipes i.e 30 days and 48 hours test shall be carried out on each test pipe.

19 CL. No. 6.0 (Table-2) of MR. No.: MNGL/LINEPIPE/MR/2020

Sr. No.

Properties Frequency (1)


7 Coating Resistivity

2 Pipes

Para 5.3.3 (e)(3)

8 Heat Ageing 2 Pipes

Para 5.3.3 (f)(3)

9 Light Ageing 2 Pipes

Para 5.3.3 (g)(3)

1) Test frequency shall be as indicated in this table and the frequency indicated in the applicable paragraphs of the specific are not applicable.

2) Previously carried out tests in an independent laboratory of national / international

Bidder intent to clarify that the following tests are the long term tests and shall be performed by coating material supplier. Test certificates shall be furnished for review and acceptance.

1. Coating resistivity 2. Heat ageing 3. Light ageing

Please confirm.


20 Cl. 6.0 (Table-2) of MR. No.: MNGL/LINEPIPE/MR/2020

Test Frequency Table – 2

Sr. No.

Properties Frequency (1)


2) Bond Strength

5 Pipes

Para 10.5

3) Impact Strength

3 Pipes

Para 10.6

4) Indentation hardness

5 Pipes

Para 10.7

5) Elongation at Failure

3 Pipes

Para 5.3.3(d) & 7.5.2(d)

6) Cathodic Disbondment

2 Pipes

Para 5.3.3(h) & 7.5.2(e)(2)

7) Degree of Cure

2 Pipes

Para 5.3.3(i) & Para 10.9(a)

1) Test frequency shall be as indicated in this table and the frequency indicated in the applicable paragraphs

Bidder understands that the test frequency specified in table -2 (Cl. No. 6.0 of Technical input for 3-Layer side-extruded polyethylene coating of pipes) is applicable only for procedure qualification test (PQT).


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

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of the specific are not applicable.

2) Two tests each on the selected pipes i.e 30 days and 48 hours test shall be carried out on each test pipe.


MARKING Colour band

Please provide the colour coding requirement; If any.

Please follow API standards.

22 Clause 1.1 of Client Spec MNGL/LINE-PIPE/TS/00

Client specification is based on API 5L 43th & 45th editions.

This is to inform you that the latest Edition of API 5L 46th has already been published and mandatory to implement by May 1, 2019, since we are API Licensee Edition.

Agreed. However stringent norms of earlier edition shall be adhered.

23 Clause 5.4 of Client Spec MNGL/LINE-PIPE/TS/00

For Welded Pipes, the pipes shall be produced from plates / skelp which shall be quenched and tempered or controlled rolled or combined controlled rolled and accelerated cooled to impart uniformly fine ferritic grain structure to the finished steel.

For Welded Pipes, the pipes shall be produced from plates / skelp which shall be quenched and tempered or controlled rolled or combined controlled rolled and accelerated cooled to impart uniformly fine ferritic grain structure to the finished steel with delivery condition of thermo mechanically rolled as per table no 1 of API 5L 46th edition. Kindly confirm.

Agreed

24 Clause No. 9.8.5.2 of Client Spec MNGL/LINE-PIPE/TS/00

The reference standard shall contain notches (N5 or N10) or radially drilled holes (3.2mm).

We understand that for HFW pipes, UT reference standard shall be as following. Please reconfirm. HFW weld seam: N10 notch & RDH 3.2mm Pipe body- 8 mm width X ½t Depth Circumferential slot. 46th edition.

Bidders understanding is correct.

25 Clause 9.5 - Client Spec MNGL/LINE-PIPE/TS/00

The measuring equipment requiring calibration or verification under the provisions of API 5L shall be

We shall follow the API (46th edition) requirements regarding to comply the calibration & verification


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

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calibrated with manual instruments at least once per operating shift (12 hours maximum).

frequency of instruments & equipment’s.

26 Clause No. 9.8.5.4.2 of Client Spec MNGL/LINE-PIPE/TS/00

Remaining Plate/ skelp Acceptance limit for material edge examination shall be as per criteria laid down for Acceptance Level E2 of BS 5996: 1993, which is reproduced hereunder for ready reference.

We understand that the acceptance criteria for remaining plate/skelp (body) shall be as per Level B4 of BS 5996:1993. Please confirm.


27 Cl. No. 12.1.2 of Client Spec MNGL/LINE-PIPE/TS/00

PSL 2 Certification requirements The Manufacturer shall furnish to Purchaser a certificate of compliance including the requirements of (Appendix F, SR15). The certificate shall comply with ISO 10474 type 3.1.c. For tests witnessed by the Purchaser, type 3.1.c. certificates shall be issued.

We understand that EN 10204 is equivalent to ISO 10474 as per Note 2 of CL. No. 10.1.1.1 of API 5L 46th latest Edition, hence we provide certificate as per EN 10204 type 3.1 or type 3.2.


28 Sr. No. 1C of Inspection & Test Plan- MNGL/LINE-Pipe/TS/00

Ultrasonic inspection required of coil/Raw material for checking of lamination, internal imperfection.

We shall do the pipe body ultrasonic testing with 100% minimum coverage area as an alternative of Coil UT for lamination after hydrostatic test. Kindly confirm.

Agreed

29 S. No. 6 & 2c Inspection & Test Plan- MNGL/LINE-Pipe/TS/00

Destructive Testing: - Quantum of check: - Material specification, Reference Documents :- PR.

We understand that quantum of check shall be as per technical specification MNGL/LINE-PIPE/TS/00 & API 5L 46th edition. Kindly confirm.

Agreed

MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

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31 C1.2 (B) Delivery Schedule of Annexure -1 to IFB Page 6 of 204 Section IV special condition of Contract C1.3 page 93 of 204

Consignment to reach warehouse for LOT I within 16, LOT II within 36 weeks and for LOT III within 52 weeks from the date of Purchase Order.

It is not economically viable to manufacture such small quantity pipe as well as steel. LOT wise raw material procurement will be a real constraint due to small quantity pipe as well as steel. LOT wise raw material procurement will be real constraint due to small quantity. Hence we request you to amend the delivery period as entire quantity within 24 weeks or earlier.

Reply to query no. 31: - Please see revised delivery schedule (lot-wise) as under: -

Lots Nashik Ramanagara Sindhudurg Total (in kms)

Delivery in weeks

I 16 8 5 29 16

II 13 6 19 36

32 Bid Validity 4(four) months from the bid due date

Looking the present scenario, it is very difficult to keep the validity upto 4 months. So we request you to please amend the bid validity as 03 months from the Bid due date.

Tender condition prevails.

33 Delivery Delivery of the Pipe from 10 weeks to 52 weeks

Looking to the dynamic prices of Raw Material it is not feasible to accept the delivery schedule for about one year. Therefore please amend the delivery schedule so that the order will be completed in maximum 7 months from the date of issue of PO.

Please refer reply to query no 31 above.

34 Delivery Lot I delivery within 16 weeks Bidder has to deliver pipes for the first lot in 16 weeks which is not possible as it takes almost 12 to 14 weeks in procuring the raw material. Therefore please change the delivery schedule for


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

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the 1st lot of pipe and has to be completed within 20 weeks from the date of issue of PO.

35 Length All pipes shall be supplied with length between 11.5m and 12.5m. However, for test sampling pipe having length between 10.0 m and 11.5 m can also be accepted. The minimum average length of the entire order shall be 12.0m.

As per rules and regulations of Road and Transport department (RTO). The pipe length above 12 meter is not allowed. Hence it should be allowed to supply the pipes in the range between 11.0m to 12.0m with average length 11.50 m and for sample pipes maximum 5% of ordered qty shall be 10.0 m to 11.0 m. Kindly confirm.


36 - Scope of Inspection: Not Mentioned

We would like to know whether scope of inspection lies with the purchaser or bidder.

Please refer clause No. 13 of General Conditions of Contract – Supply of tender document. Tender conditions prevail

37 - MoPNG Policy for providing Purchase Preference to the manufactures/services providers (linked with local content) - PP LC

Since import of raw material for manufacturing of coated pipe is allowed, we request MNGL to allow provision of MoPNG Policy (PP-LC) in this tender so as to encourage domestic manufacturers to progressively adopt 'Make in India' practices and add local content value to their goods.


38 - Applicability of DVA policy: We request that ‘’Ministry of steel policy to provide preference to domestically manufactured Iron & Steel product in public procurement’’ is made applicable for this tender


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as overall cost of project may be higher the threshold requirement of this project. Please confirm.

39 Cl. No. 4.1.1 & 4.1.2 of Section IV (Page 94 of 204)

Payment Terms As our scope is limited to unloading and stacking of material at site, we therefore request for release of 100% payment against receipt and acceptance of material at storage yard along with transportation charges within 30 days of submission of invoices and other required documents.


40 General Scope of work We understand that land will be provided in developed condition by MNGL for unloading and stacking of material at Nashik, Sindhudurg and Ramanagara. Please confirm.

Land will be provided at respective location by MNGL. However supply of wooden sleepers and other necessary materials required for pipe stacking, etc. as per the requirements of scope of work shall be in bidder’s scope.

41 - Item & location wise length tolerance

Given quantity tolerance is -0/+1 pipe length. Please confirm whether it is item wise or ‘’item wise &location wise’’.

It is item wise and location wise.

42 - Evaluation & Award We request package wise evaluation and award of entire quantity to single L1 bidder instead of item wise evaluation.


43 BEC (Page No. 7 of 204)

Delivery Schedule Tendered quantity is too small to dispatch in three lots hence we propose to dispatch tendered quantity in one go.


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44 Cl. 20.8.1 of Section IV SCC (Page No. 100 of 218)

PE Coating Test Certificates Bidder shall be required to submit recent test certificates for the material being used in works from the recognized laboratories. These certificates should indicate all properties of the materials as required in relevant IS Standards or international Standards.

Bidder will submit raw material supplier test certificate for each batch of epoxy, Adhesive and Polyethylene properties as specified in clause no. 5.3 of Client Spec. No. MNGL/PL COATING /TS/00. Please Clarify

Agreed

45 Cl. 1.0 of Technical Specification No. MNGL/PL COATING/TS/00 (Page No 155 of 218)

For application of external anti-corrosion coating of pipes by using 3 Layer Side Extruded Polyethylene Coating conforming to DIN-30670, 1991, `Polyethylene Coating of Steel Pipes and Fittings' and the requirements of this specification.

Bidder has considered the latest version DIN-30670, 2012 to be followed for 3LPE coating. Please Clarify

Agreed

46 Cl. 4.2 of Technical Specification No. MNGL/PL COATING/TS/00 (Page No. 158 of 218)

The coating materials Manufacturer shall carry out tests for all properties specified in para 5.3.1 and 5.3.2 for each batch of epoxy, adhesive and polyethylene compound. In addition, the Manufacturer shall also furnish Infrared Scan for each batch of epoxy powder. The coating materials manufacturer shall issue test certificates as per DIN EN 10204, 3.1B for each batch of materials supplied to CONTRACTOR and the same shall be submitted to COMPANY for approval prior to their use.

Material manufacturer will provide batch test certificate for the measured value and typical value as mentioned below: Epoxy Powder: All Properties PE Adhesive: Melt flow rate test results shall be reported as tested / measured value for each batch whereas the Specific gravity & Vicat Softening point will be reported as typical values supported by reputed lab reports. High Density Polyethylene: Specific Gravity, Melt Flow Rate, Oxidation Induction Time, Carbon Black Content results shall be reported as measured value for each batch. The properties - Hardness


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NATURAL GAS LIMITED


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Shore D, Elongation at break, Tensile Strength, Vicat Softening point, Environmental Stress Crack Resistance (ESCR), Volume Resistivity and Dielectric Withstand, Water absorption test shall be reported as typical value supported by independent lab test report valid for one year. For Heat ageing, Light ageing and Coating Resistivity test bidder will submit independent laboratory test report furnished by material manufacturer. These test certificates will not be older than three years. Please Clarify

47 Cl. 5.3.1 of Technical Specification No. MNGL/PL COATING/TS/00 (Page No. 160 of 218)

Epoxy powder properties shall be as per CSA Z245.20.98.

Bidder has considered the latest version CAN/CSA Z245.20-2018. Please Clarify

Agreed

48 Cl. 5.3.3 (a) of Technical Specification No. MNGL/PL COATING/TS/00

Bond Strength (using Type 2 Test Assembly i.e. Dynamometer)

Bidder propose to bond strength test shall be carried out by manual peel test machine (Spring loaded test assembly) due to size constraint. Please Clarify

Agreed

49 Cl. 8.13.1 of Technical Specification No. MNGL/PL COATING/TS/00 (Page No. 174 of 218)

Following completion of abrasive blast cleaning, all pipe surface shall be chemically Pre-treated with a 10% strength chromate solution.

It is hard to maintain exact 10% strength of chromate solution. Hence, Bidder will maintain chromate solution strength 10±2%. Please Clarify

Agreed

50 Cl. 8.13.4 of Technical Specification No. MNGL/PL COATING/TS/

Chromate The concentration shall be checked at the make-up of each fresh solution and once per hour, using a method

Bidder propose test frequency as once per shift. Please Clarify


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NATURAL GAS LIMITED


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00 (Page No. 174 of 218)

approved by the chemical manufacturer.

51 Cl. 9.2.2 of Technical Specification No. MNGL/PL COATING/TS/00 (Page No. 177 of 218) & Cl. 2.2 of Technical input for 3-layer side-extruded polyethylene coating of pipes (Page No. 193 of 218)

Technical input for 3LPE The minimum thickness of finished 3-Layer side extruded “HIGH DENSITY POLYETHYLENE” coating for 10” dia. line pipes shall be 2.0 mm.

Bidder understands that 10% reduction in minimum total coating thickness is allowed as per Cl. No. 9.2.2 of Specification No. MNGL/PL COATING/TS/00, in case bidder uses HDPE topcoat material as per approved coating material list given in Annexure – I Please Clarify


52 Cl. 10.5 of Technical Specification No. MNGL/PL COATING/TS/00 (Page No. 180 of 218)

The system shall disband / separate cohesively either in adhesive layer or in polyethylene layer. Majority of the peeled off area on the pipe shall show presence of adhesive. Disbondment/ separation at epoxy to steel interface or epoxy/ adhesive interface or adhesive/ polyethylene interface shall not be permitted. The failure mode shall be recorded for each test.

Bidder intent to clarify that the cohesive failure in adhesive layer is not practical when grafted adhesive are used as per ISO 21809-1:2018 Table 7, there shall be No Disbonding between steel and epoxy. Bidder will use adhesive material Borouge /Borealis ME0420 which is grafted adhesive; hence 3LPE coating system failure mode is not much relevant in this case. Please Clarify


53 Annexure-I of Technical Specification No. MNGL/PL COATING/TS/00 (Page No. 190 of 218)

PE Compound (Manufacturer) HE 3450 (BOREALIS)

Bidder has considered approved material PE compound HE 3450 (BOROUGE/BOREALIS) instead of HE 3450 (BOREALIS). Please Clarify


54 Cl. 6.0 (Table 2) of Technical input for 3-layer side-extruded

Test frequency Table-2 Bidder understand that test frequency mentioned in Table-2 is applicable for PQT. For regular production, we


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polyethylene coating of pipes (Page No. 196 of 218)

will follow test frequency as mentioned in Technical Specification No. MNGL/ PL COATING /TS/00. Please Clarify

55 Cl. 6.0 (Table 2) of Technical input for 3-layer side-extruded polyethylene coating of pipes (Page No. 196 of 218)

Bond Strength: Frequency 5 Pipes Indentation hardness: 5 Pipes

As maximum 4 pipes of 3LPE coated available out of 5 pipes selection as per PQT clause 7.3 of Technical Specification No. MNGL/ PL COATING /TS/00. Hence bidder has considered 4 pipes for bond strength & Indentation hardness testing. Please Clarify


56 Tender Part-A Section-I ANNEXURE-I to IFB CL 2 SECTION – V SCHEDULE OF RATES (SOR) MR

2.0 A) SCOPE & QUANTITY OF SUPPLY: Item No. 1, 2 & 3: OD: 273.3mm Pipe Size (OD) Inch (mm): 10” (273.1)

We have considered Pipe size (OD) as 10.75 Inch (273.1mm). Please Clarify


57 Contents 1.1 SECTION – V SCHEDULE OF RATES (SOR) (Page No. 102 of 218)

SR-5 : Fracture Toughness Testing (Charpy V-Notch) SR-6 : Drop Weight Tear Testing (DWTT) on Welded Pipe SR-17 : Non Destructive Inspection of Welds in Electric Welded Pipes and Laser Welded Pipes SR-19: Additional Fracture Toughness Requirements (Transverse Charpy V-Notch) for PSL 2 Pipe. This specification establishes the minimum requirements for the manufacture of Seamless, Electric Welded and Submerged Arc Welded Steel line pipes in accordance with the requirements of API (American Petroleum Institute)

We intend to clarify that at many places in Client specification references are specified of API 5L 43rd Edition or 45th Edition. However, We confirm to meet the requirements of API 5L 46th Edition April 2018 & Errata 1 dated May 2018, in-order to fulfill the API monogramming requirements. HFW Line pipe shall be supplied in “M” condition accordance with API 5L 46th edition – 2018 and MNGL specification from Hot Rolled Coil through TMCP route. We understand that service condition for this

Agreed. However stringent norms of Earlier edition shall be adhered.

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Specification 5L, Forty Third Edition, March, 2004 and makes restrictive amendments/ supplements to aforesaid API Spec. 5L. Unless modified (amended and/ or supplemented) and referred by this Specification, the requirements of API Spec. 5L shall be valid. 45th edition of API 5L may be followed however stringent conditions of API 43rd Edition /Technical specification shall govern. Manufacture & Supply of 3LPE Coated Line Pipes: Line Pipe as per API 5L, December 2012 (45th edition), PSL2 and Technical Specification No. MNGL/LINEPIPE/TS/00 and PE Coating as per Technical Input, Technical Specification No. MNGL/PL COATING/TS/00

enquiry as Onshore & Non-sour. The minimum design temp & test temperature for CVN impact test is considered as 0°C. Please Clarify

58 Cl. No. 7.4 SPECIFICATION NO.: MNGL/LINE-PIPE/TS/00 (Page No. 119 of 218)

All pipes shall be supplied with length between 11.5m and 12.5m. However, for test sampling pipe having length between 10.0 m and 11.5 m can also be accepted. The minimum average length of the entire order shall be 12.0m.

We propose length 11.5m -12.5m for minimum of 95% pipes and 10m -11.5m for maximum of 5% pipes. However, We confirm 12 m as Minimum Average Length. Please Clarify


59 Cl. No. 9.8.5.2 SPECIFICATION NO.: MNGL/LINE-PIPE/TS/00 (Page No. 129 of 218)

The reference standard shall contain notches (N5 or N10) or radially drilled holes (3.2mm).

We understand that reference standard will be N10 notch as per API 5L Annex E .Table E.8 Please Clarify

Bidders understanding is correct.

60 Cl. No. 9.8.5.2 SPECIFICATION NO.: MNGL/LINE-PIPE/TS/00 (Page No. 129

The Primary reference sensitivity level shall be adjusted on the following reference reflectors :

We propose, Laminar imperfection shall be tested at Pipe Mill in Coil stage immediately before pipe forming. The reference reflector size


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NATURAL GAS LIMITED


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of 218) Surface Defect Detection

Notch N5

Defect Detection Body and Pipe End

Notch N5

Defect Detection Welds

RDH 3.2 mm

Notch N10

Defect Detection Plate and Axial Defect

Notch N5

shall be 6 mm width X t/2 depth. Please Clarify

61 10.3.5 and Appendix-I , I.3.5 (Page No. 133 of 218)

A Colour code band shall be marked on inside surface of finished pipe for identification of pipes of same diameter but different wall thickness, as indicated in the Purchase Order. The Colour code band shall be 50mm wide and shall be marked at a distance of 150mm from the pipe ends.

We understand, since only one thickness is tendered per diameter, the specified requirement is not applicable and no such Colour coding shall be made. Please Clarify

Agreed

62 ANNEXURE-II (NEW) CL-d(VI) (Page No. 150 of 218)

At points selected by Purchaser, 12 DWTT specimens shall be removed from base metal in a transverse direction.

We understand, Drop Weight Tear Test is applicable for Pipes of OD > 406.4 mm only as per client specification Cl. 6.2.5.3. Hence, this test is not required for the tendered sizes. Please Clarify

Bidder’s understanding is correct.

63 - General We clarify that the received ITP shall retain for information. However, project basis detailed ITP shall be submitted for review & approval in case of award. Please Clarify


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64 Cl. No. 1.1 of Specification No.: MNGL/LINE-PIPE/TS/00

The Manufacturer shall have a valid license to use API Monogram for Manufacturing of line pipe in accordance with the requirements of API Spec. 5L, Forty Third Edition, March, 2004. 45th edition of API 5L may be followed however stringent conditions of API 43rd Edition /Technical specification shall govern

The pipe shall be manufactured and supplied in accordance with API 5L 46th edition.

Agreed

65 Cl. No. 5.4 of Specification No.: MNGL/LINE-PIPE/TS/00

For Welded Pipes, the pipes shall be produced from plates / skelp which shall be quenched and tempered or controlled rolled or combined controlled rolled and accelerated cooled to impart uniformly fine ferritic grain structure to the finished steel. Other types of heat treatment shall be agreed upon between purchaser and Manufacturer.

Steel shall be thermo mechanically rolled.

Agreed

66 Cl. No. 4.2 of Specification No.: MNGL/PL COATING/TS/00

The coating materials Manufacturer shall carry out tests for all properties specified in Para 5.3.1 and 5.3.2 for each batch of epoxy, adhesive and polyethylene compound.

Raw material for polyethylene and adhesive are as per ISO 21809-1 or as per DIN 30670. Remaining tests will be typical values supported by reputed lab reports. Please confirm.



c) iv, Moisture content No specific criteria are provided. We propose to perform test as per raw material manufacturer test certificate.

Agreed

68 Cl. No. 5.3.3 of Specification No.: MNGL/PL COATING/TS/00

Properties of coating system We propose as per latest edition of DIN 30670, for test method and acceptance criteria requirement as per tender specification. Please confirm.

Agreed

69 Cl. No. 5.3.3 h of Specification No.:

Cathodic Disbondment @+65°C after 30 days @+65°C after 48 hrs

We understand this is min. temperature or provide tolerance. Please confirm.


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

Page 18 of 22

MNGL/PL COATING/TS/00

70 Cl. No. 5.3.3 I of Specification No.: MNGL/PL COATING/TS/00

Degree of Cure of Epoxy - Percentage Cure = 95% - ΔTg = +3/-2

We propose as per latest CAN/CSA 245.20 - Percentage Cure = 95% - ΔTg = +5°C

Agreed


Measurement and logging We maintain data in SAP system and provided pdf format in C.D

Agreed


All pipes shall provided chemical pre-treatment with phosphoric acid solution. 10% solution of phosphoric acid, Oakite 31 / 33 or equivalent, shall be used to remove all soluble salts and other soluble contaminations.

Exact 10% is not practical; we shall maintain it as min. 10% or 10+/-2%.

Agreed


Surface of pipe after abrasive blast cleaning shall have an Anchor pattern of 50 to 70 microns (Rz). This shall be measured for each pipe by a suitable instrument such as surface profile depth gauge.

We propose roughness 40 to 90 as per DIN 30670 and roughness measurement by digital roughness gauge every hour.



Following completion of abrasive blast cleaning, all pipe surfaces shall be chemically Pre-treated with a 10% strength chromate solution.

Exact 10% is not practical; we shall maintain it as min. 10% or 10+/-2%.

Agreed


The concentration shall be checked at the makeup of each Fresh solution and once per hour, using a method approved by the chemical manufacturer.

We propose that once solution is prepared in sufficient amount for one shift, the concentration shall be checked. So you are requested for revise the frequency as once/shift.


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

Page 19 of 22


In case the relative humidity exceeds 80%, the adhesive and polyethylene material shall be dried using hot air as per the directions of COMPANY representative.

We understand that humidity measurement shall be done at material feeding area.



The extrusion temperatures of the adhesive and Polyethylene shall be continuously recorded. The monitoring instruments shall be independent of the temperature control equipment. The instruments shall be calibrated prior to start of each shift.

We propose that such instrument (i.e. infrared gun, pyrometer) needs calibration in third party laboratory with special equipment and with trained personal. We propose the review of NABL lab calibration certificate for same and extrusion temperature of adhesive and polyethylene shall be recorded once per hour in logbook / report. Please confirm.



The coating thickness shall be determined by taking at least 10 measurements at locations uniformly distributed over the length and periphery of each pipe.

During the PQT pipes, thickness will be measured for each pipe. After consistence result of regular production, it may reduce to one hour in place of each pipe.


79 Cl. No. 10.5.b of Specification No.: MNGL/PL COATING/TS/00

The system shall disband / separate cohesively either in adhesive layer or in polyethylene layer. Majority of the peeled off area on the pipe shall show presence of adhesive. Disbondment/ separation at epoxy to steel interface or epoxy/ adhesive interface or adhesive/ polyethylene Interface shall not be permitted. The failure mode shall be recorded for each test.

We propose to use adhesive as per specification in cl no. 9.2.1 (ii), Grafted co-polymer adhesive , Due to this material characteristics failure mode in not always cohesively, its bond strength is higher than specification requirement and beyond that it not separate from cohesively, however RMTL agree for epoxy to steel Disbondment shall not permitted, RMTL proposed


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

Page 20 of 22

cohesive criteria will deviate grafted adhesive as describe in ISO 21809-1 table 7, Note C.


Repair materials clearly establishing the compliance of the repair materials with the applicable coating requirements indicated in this specification.

We understand its compliance is not for properties described on this specification cl no. 5.3.3. Because repair material properties is different than plant applied 3lPE coating. If there are any other requirement criteria for repair material, please specify.


81 - Irrespective of type of repair, the maximum numbers of repair of coating shall be as follows:

We understand that repair generated due to tests is not covered in above criteria


82 Specification No.: TECHNICAL INPUT FOR 3-LAYER SIDE-EXTRUDED POLYETHYLENE COATING OF PIPES ; (MR. NO.: MNGL/LINEPIPE/MR/2020) Test Frequency Table – 2

Test frequency shall be as indicated in this table and the frequency indicated in the applicable paragraphs of the specific are not applicable.

We consider this frequency is for PQT pipe only.


83 Specification No.: TECHNICAL INPUT FOR 3-LAYER SIDE-EXTRUDED POLYETHYLENE COATING OF PIPES ; (MR. NO.: MNGL/LINEPI

Bond Strength , Frequency 5 Pipes

As maximum 4 pipes of 3LPE coated available out of 5 pipes selection as per PQT clause, we consider 4 pipes for testing.

Agreed

MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

Page 21 of 22

PE/MR/2020) Test Frequency Table – 2


Indentation hardness , Frequency 5 Pipes

As maximum 4 pipes of 3LPE coated available out of 5 pipes selection as per PQT clause, we consider 4 pipes for testing.

Agreed


Cathodic Disbondment; Frequency 2 Pipes and two tests each on the selected pipes i.e. 30 days and 48 hours test shall be carried out on each test pipe.

We conduct one test for 48 hrs on one pipe and 30day test on another pipe or both test on one pipe as per 3lpe specification. Please confirm.


86 Specification No.: TECHNICAL INPUT FOR 3-LAYER SIDE-EXTRUDED POLYETHYLENE COATING OF PIPES ; (MR. NO.: MNGL/LINEPIPE/MR/2020)

Degree of Cure ; Frequency 2,

We understand it’s a one pipe partly coated and one pipe 3LPE coated, Please confirm


MAHARASHTRA

NATURAL GAS LIMITED


BID NO. MNGL/C&P/2019-20/160

Page 22 of 22

Test Frequency Table – 2

Please submit the signed & stamped copy of Replies to Queries of the Bidders along with tender document with your techno-commercial offer as a token of acceptance. All the others terms and conditions of the bid documents are unchanged. With regards.

Ganesh Said

Chief Manager (C&P)