Volume-II - GAIL

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(iii) In case the above tests do not comply with the above requirement, CONTRACTOR shall test all the preceding and succeeding coated pipes. If both pipes pass the test, then the remainder of the pipe joints in that shift shall be deemed satisfactory. If either pipe fails to meet the specified requirements, all pipes coated during the shift shall be tested until the coating is provided acceptable. Rejected coated pipes shall be stripped and re-coated in accordance with approved procedure, at CONTRACTOR’s expense. (iv) The frequency of bond strength test as per para 10.5(ii) for cut back portion may be reduced depending upon the consistently of result to one pipe in every twenty five(25) instead of every fifteen pipes, at the sole discretion of the COMPANY Representative. 10.6 Impact Strength (i) Impact resistance test shall be conducted as per clause 5.3.3 (ii) of this specification. Initially the frequency of test shall be 2 (two) coated pipes per shift, which may be further reduced and/ or waived depending upon consistently acceptable results at the sole discretion of COMPANY’s Representative. (ii) Minimum thirty (30) impacts located equidistant along the length of coated pipe shall be performed. (iii) Immediately after testing, the test area shall be subjected to holiday detection at the same voltage as used prior to impact strength test. The pipe shall be rejected if any holiday is noted in the test area. (iv) In case of test failure, retesting and disposal of coated pipe shall be as per 10.5 (iii) above. 10.7 Indentation Hardness (i) Indentation hardness test shall be as per clause 5.3.3 (iii) of this specification. The frequency of test shall be initially 2(two) coated pipes per shift which shall be further reduced to one test each on 2 coated pipes per week at random after 1 week of consistently acceptable results. Two samples for each temperature shall be taken from the cut back portion of coated pipe and one in middle of the pipe for this test. (ii) In case of test failure, retesting and disposal of coated pipe shall be as per 10.5(iii) above. 10.8 Air Entrapment Test (i) Strips from bond strength tests or coated pipe may be used to help determine the porosity of the finished coating. Strip shall be also cut from longitudinal weld (if applicable) at cut back portion and examined for the presence of voids. (ii) Bond strength strip shall be viewed from the side and at the failure GAIL (INDIA) LIMITED 3 – LAYER POLYETHYLENE COATING OF LINEPIPES GAIL-TS-COATING-3LPE Page 25 of 35
interface. At the pipe bond strength test location, utility knife shall be used to cut the edge of the coating to a 45° angle and view with a microscope. Similar examination shall be done in the coating cut back area. (iii) One sample each either on the bond strength strip or coated pipe and strip cut from the longitudinal weld (if applicable) shall be examined for air entrapment per shift. Strips shall be viewed from the side. (iv) All examination shall done using a 30X magnification hand-held microscope. The polyethylene and adhesive layers shall have no more than 10% of the observed area taken up with air entrapment (porosity or bubbles). Air entrapment shall not occupy more than 10% of the thickness in each case. Bubbles shall not link together to provide a moisture path to the epoxy layer. (v) In case of test failure, retesting and disposal of coated pipe shall be as per 10.5 (iii) above. 10.9 Degree of Cure (i) Epoxy film samples shall be removed from cut back portion of the coated pipe using hammer and cold chisel and the samples shall be taken for cure test using DSC procedure. Care shall be taken to remove the samples of full film thickness avoiding inclusion of steel debris. Glass transition temperature differential (∆Tg) and % cure (∆H) shall comply the specified requirements. (ii) Frequency of this test shall be once per shift. Pipe shall be selected randomly by COMPANY Representative during the middle of a shift. Suitable provisions/ arrangements as per the instructions of COMPANY Representative shall be made by the CONTRACTOR for this purpose. (iii) In case of test failure, production carried out during the entire shift shall be rejected, unless the CONTRACTOR proposes a method to establish the compliance with the degree of cure requirements of all pipes coated during that shift. 10.10 Epoxy Layer Adhesive Test (i) Adhesion of epoxy layer shall be determined at ambient temperature by the “St Andrews Cross” method i.e. by cutting two straight lines through the epoxy layer with a sharp knife. The incisions shall intersect at an angle of 30°/ 150°. The epoxy coating shall resist disbondment from the steel when attempts are made to flick/ lift the coating from the 30° angle with a sharp knife. (ii) Frequency of this test shall be once per shift. The test shall be carried out at the cut back portion of the pipe from which the Degree of Cure test has been carried out as per para 10.9 above. (iii) In case of test failure, retesting and disposal of coated pipe shall be as per 10.9 (iii) above. GAIL (INDIA) LIMITED 3 – LAYER POLYETHYLENE COATING OF LINEPIPES GAIL-TS-COATING-3LPE Page 26 of 35
Page 1 and 2:
JLPL ESSAR OIL LPG PIPELINE CONNECT
Page 3 and 4:
SPECIAL CONDITIONS OF CONTRACT The
Page 5 and 6:
2.6.3 Deduction at Source 2.6.3.1 P
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6.3 The materials, design, and work
Page 9 and 10:
(iv) The Contractor shall adhere to
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6.24 Insurance (For option - II & I
Page 13 and 14:
GAIL (INDIA) LIMITED TABLE OF CONTE
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3.4 Repair of defects on pipes reco
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4.0 SCOPE OF SUPPLY 4.1 Material to
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all damages occurring and/or noted
Page 21 and 22:
GAIL (INDIA) LIMITED Material Requi
Page 24 and 25:
JLPL ESSAR OIL LPG PIPELINE CONNECT
Page 26 and 27:
CONTENTS Sl. No. Description 1.0 SC
Page 28 and 29:
5.1.2 Welding Process 5.1.2.1.1 Con
Page 30 and 31:
LSAW pipes shall be mechanically co
Page 32 and 33:
6.2.5 The minimum elongation of bas
Page 34 and 35:
6.2.7.3 (New) 6.2.7.4 (New) Procedu
Page 36 and 37:
7.8.2 Offset of Plate Edges 7.8.3 7
Page 38 and 39: 9.2.1 Heat Analysis Where the steel
Page 40 and 41: 9.8 Non - Destructive Inspection 9.
Page 42 and 43: 9.8.5.1.1 (New) Seamless Pipe : 45
Page 44 and 45: Location SEL - 072 Lamination Accep
Page 46 and 47: 12.3 (New) 12.4 (New) hard copy rec
Page 48 and 49: B.1.2 Weld Seam of Welded Pipe APPE
Page 50 and 51: APPENDIX - F SUPPLEMENTARY REQUIREM
Page 52 and 53: Representative. SR 17.3 Acceptance
Page 54 and 55: ANNEXURE - I (NEW) MANUFACTURING PR
Page 56 and 57: (2) of these specimens shall be tes
Page 58 and 59: FIGURE 6.2.6.1 GAIL (INDIA) LIMITED
Page 60 and 61: FIGURE 6.2.6.2(b) GAIL (INDIA) LIMI
Page 62 and 63: FIGURE 7.8.3 GAIL (INDIA) LIMITED C
Page 64 and 65: CONTENTS SL NO. DESCRIPTION 1.0 SCO
Page 66 and 67: 13 ASTM G-42 : Tentative Methods fo
Page 68 and 69: week prior to its use, to establish
Page 70 and 71: Sl. No. Properties Units Requiremen
Page 72 and 73: (i) Details of plant(s), locations,
Page 74 and 75: A batch representing a normal produ
Page 76 and 77: (iii) Adhesive Layer Thickness Adhe
Page 78 and 79: (i) Surface cleanliness, surface ro
Page 80 and 81: specification. 8.6.2 The pipe tempe
Page 82 and 83: decision on rejection or re-blastin
Page 84 and 85: and/ or as per COMPANY representati
Page 86 and 87: 9.2.11 Coating and/ or adhesive sha
Page 90 and 91: 10.11 Cathodic Disbondment Test (i)
Page 92 and 93: 11.6 The lorries used for transport
Page 94 and 95: All repairs carried out to coating
Page 96 and 97: COATING SYSTEM/ MATERIAL PREQUALIFI
Page 98 and 99: TABLE - 2 S.No Properties Frequency
Page 100 and 101: Name of bidder PRICE SCHEDULE FOR S
Page 102 and 103: ITEM NO OF MR ENCLOSURE TO PRICE SC
Page 104 and 105: Notes Price Schedule for the Coatin
Page 110 and 111: Notes Place of taking delivery of p
Page 112 and 113: JLPL ESSAR OIL PIPELINE CONNECTIVIT
Page 114 and 115: ITEM NO OF MR ENCLOSURE TO PRICE SC
Page 116: PRICE SCHEDULE FOR COATED LINE PIPE
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Volume-II - GAIL

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