Volume-II - GAIL

More documents

Recommendations

Info

9.8.5.1.1 (New) Seamless Pipe : 45 (40 – 48) Degrees EW Pipe : 50 – 70 Degrees SAW and SPW pipe longitudinal defect detection SAW and SPW pipe transverse defect detection : 45 (40 – 48) Degrees (on Weld Bead) : 50 – 70 Degrees (X or K transmission) Lamination testing may be performed in pulse echo or transmission mode; wall thickness only in pulse echo mode. The probe(s) used for wall thickness / lamination check should satisfy the following requirements: Twin crystal probes Single crystal probes in be better pulse echo mode : The focal length should be 50% of the wall thickness. : The near surface resolution should be 25% of the wall thickness, measured at the primary reference sensitivity level. The transducer arrangement shall be such that the sound intensity in both the longitudinal and circumferential directions does not decrease by more than 3 dB at any point in the pipe wall referred to the maximum sound intensity adjusted in the static calibration. The equipment shall be checked with an applicable reference standard (test piece) as described in (Section 5) at least every four hours and at the beginning and end of a batch in order to demonstrate the effectiveness of the inspection procedures and show that the equipment is functioning correctly. In case discrepancies of more than 3 dB occur, then all pipes inspected since the previous check shall be re-inspected. Proper functioning of the UT equipment and the linearity of the electronic instrumentation shall be checked at least once every six months or if a change is made to the equipment. From each pipe under test, an automatic "on-line" record shall be made without operator intervention. For every pipe, a summary record shall be made showing pipe identification number, time and examination results, including re-examinations. If parts of the ultimate pipe ends are not covered by an automatic UT system (untested area), manual ultrasonic test (UT) shall be carried out using approved procedures for manual ultrasonic examination based on the requirements given above. The complete circumference of seamless pipe ends or rotary tested HEW pipe ends, shall be tested manually over the length of the untested area plus 25mm overlap of the automatically tested area. Electromagnetic Equipment If permitted by the Purchaser, EMT methods such as eddy current testing or magnetic flux leakage testing may be applied for surface defect detection in seamless pipe. EMT shall be performed in accordance with ASTM F 309 or ASTM E 570. Testing shall be GAIL (INDIA) LIMITED CARBON STEEL LINE PIPES GAIL-TS-LINEPIPE-CS Page 17 of 37
performed by automatic equipment over the entire surface of the pipe. If parts of the ultimate pipe ends are not covered by an automatic EMT system (untested area), then manual ultrasonic shall be carried out using approved procedures for manual ultrasonic examination based on the requirements given above. The complete circumference of the pipe ends shall be tested by manual UT, over the length of the untested area plus 25mm overlap of the automatically tested area. 9.8.5.2 Ultrasonic and Electromagnetic Inspection Reference Standards Following will also be noted. The reference standard (Calibration pipe) shall have the same specified diameter and wall thickness as the pipe being inspected and shall be of sufficient length to permit calibration of ultrasonic inspection equipment at the speed to be used in normal production. The reference standard (calibration pipe) shall also be of the same material, type and have the same surface finish and heat treatment as the product to be inspected. It shall be free from discontinuities or other conditions producing indications that may interfere with detection of the reference reflectors. The reference standard shall contain notches (N5 or N10) or radially drilled holes (3.2mm). The Manufacturer may use a type of reference reflector, not specified above, provided he can demonstrate to Purchaser that the examination is at least as sensitive as prescribed in this specification. In such cases , the Manufacturer shall obtain approval from Purchaser. The Primary reference sensitivity level shall be adjusted on the following reference reflectors : S. No. Examination Type Type of Pipe SMLS EW SAW/SPW (i) Lamination Detection FBH 6.3mm FBH 6.3mm FBH 6.3mm (ii) Surface Defect Detection Notch N5 (iii) Defect Detection Body and Pipe End Notch N5 (iv) Defect Detection Welds Notch N10 RDH 3.2mm (v) Defect Detections Plate and Axial Defects Notch N5 For all reference reflectors except for RDH 3.2mm , the acceptance limit signal shall be equal to the primary reference sensitivity level , i.e. equal to the height of the signal produced by the reference reflector. For the RDH 3.2mm reference reflector , the acceptance limit signal shall be 10 dB below the primary reference sensitivity level. All sensitivity adjustments shall be carried out dynamically. Flat bottomed hole (FBH) for lamination detection shall be drilled to the midwall position. 9.8.5.4 Acceptance Limits Following also to be noted. For all examination types, indications exceeding the acceptance limit signal are unacceptable. For lamination detention in plate coil , seamless pipe body and pipe ends , the acceptance limit shall be based on the lamination size and frequency and be in accordance with the classification of SEL – 072 , as described below : GAIL (INDIA) LIMITED CARBON STEEL LINE PIPES GAIL-TS-LINEPIPE-CS Page 18 of 37
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
Page 7 and 8: 6.3 The materials, design, and work
Page 9 and 10: (iv) The Contractor shall adhere to
Page 11 and 12: 6.24 Insurance (For option - II & I
Page 13 and 14: GAIL (INDIA) LIMITED TABLE OF CONTE
Page 15 and 16: 3.4 Repair of defects on pipes reco
Page 17 and 18: 4.0 SCOPE OF SUPPLY 4.1 Material to
Page 19 and 20: 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 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 88 and 89: (iii) In case the above tests do no
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 106 and 107:
Page 108 and 109:
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
show all

Volume-II - GAIL

Create successful ePaper yourself

Delete template?

Save as template?