GB/T 31032-2023Welding and acceptance standard for steel pipings and pipelines (English PDF)

Foreword

This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting:

This document replaces GB/T 31032-2014 "Steel Pipe Welding and Acceptance": Compared with GB/T 31032-2014, except for structural adjustments In addition to editorial changes, the main technical changes are as follows:

a) The scope of application has been changed, changing "gas" in the applicable medium to "natural gas", and changing the scope of application to "transmission pipelines, pipe networks, valve chambers and "Station" was changed to "long-distance pipeline, gathering pipeline", the "gas welding" welding method was deleted, and X-ray digital imaging detection and X-ray Online computer-aided imaging inspection and other acceptance requirements (see Chapter 1, Chapter 1 of the:2014 edition);

b) Delete the terms "owner", "contractor", "root weld", "repair", "weld", "display", "qualified welder", "welder examination" and "welding procedure qualification" Terms and definitions (see 3:1, 3:2, 3:5, 3:9, 3:12, 3:16, 3:18, 3:19, 3:21 of the:2014 edition);

c) Added "Welding Process Assessment Report", "Automatic Welding", "Root Pass", "Back Welding", "Rework Welding", "Full Wall Thickness Repair" and "Partial Wall Thickness Repair" Repair", "Backside internal repair", "Second repair", "Repair", "Welding heat input", "Preheating temperature", "Interpass temperature", "Post-weld heat treatment", "Hollow Terms and definitions of “weld bead”, “tempering weld bead” and “surfacing repair” (see 3:2, 3:5, 3:10, 3:11, 3:15~3:24, 3:28~3:30);

d) Changed the definition of the terms "pre-welding procedure specification", "welding procedure specification", "motorized welding", "rotating welding", "stationary welding", "defect" and "recessed" Meaning (see 3:1, 3:3, 3:4, 3:7, 3:8, 3:26, 3:27, 3:20, 3:22, 3:3, 3:10, 3:11, 3:15, 3:17 of the:2014 edition);

e) Added abbreviations (see Chapter 4);

f) Added the contents of personnel, welding process and welding environment (see Chapter 5);

g) The specific requirements for pipes and fittings have been changed (see 5:2:1, 4:2:1 of the:2014 edition);

h) The filling material type and specifications have been changed (see 5:2:2:1, 4:2:2:1 of the:2014 edition);

i) The basic elements of welding procedure qualification have been changed, and Charpy impact toughness test, macroscopic metallographic test, tensile test, back bending and surface test have been added:

Bend test, side bend test, SSC test, HIC test, CTOD test, hardness test methods and requirements, etc: (see Chapter 6 Chapter, Chapter 5 of the:2014 edition);

j) Changed the on-the-job examination method, the applicable wall thickness range of a single examination, and added the technical requirements for a single examination of branch pipe connections (see Chapter 7, Chapter 6 of the:2014 edition);

k) The requirements for the misalignment of the nozzle group and the size requirements for the appearance inspection of the weld have been changed, and the groove form of butt welds with different wall thicknesses and the Requirements for the use of mouthparts, etc: (see Chapter 8, Chapter 7 of the:2014 edition);

l) The requirements for non-destructive testing personnel have been changed, and X-ray digital imaging testing, X-ray computer-aided imaging testing, and phased array testing have been added:

Ultrasonic testing, fully automatic ultrasonic testing and other methods (see Chapter 9, Chapter 8 of the:2014 edition);

m) X-ray digital imaging testing, X-ray computer-aided imaging testing, phased array ultrasonic testing, and fully automatic ultrasonic testing have been added and other assessment requirements, and changed the radiographic detection of pores, magnetic particle detection of round defects, penetrant detection of round defects, and ultrasonic detection of volumetric defects:

Evaluation indicators and other contents (see Chapter 10, Chapter 9 of the:2014 edition);

n) Added rework requirements, basic elements of welding procedure qualification for rework welding, rework welding procedures, rework welder induction examination, etc: (see Chapter 11);

o) X-ray digital imaging testing, X-ray computer-aided imaging testing, phased array ultrasonic testing, and fully automatic ultrasonic testing have been added and other contents, changes in radiographic testing, ultrasonic testing and other contents (see Chapter 12, Chapter 11 of the:2014 edition);

p) Changes have been made to the welding procedure regulations for motorized welding, the basic elements for qualification of motorized welding procedures, and the on-the-job examination for motorized welding workers (see Chapter 13, Chapter 12 of the:2014 edition);

q) The corresponding content of project criticality assessment has been changed (see Appendix A, Appendix C of the:2014 version);

r) The corresponding content of welding of pipelines in service has been changed (see Appendix B, Appendix D of the:2014 version);

s) The recommendation record form has been changed (see Appendix C, Appendix E of the:2014 version):

Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:

This document is proposed and coordinated by the National Petroleum and Natural Gas Standardization Technical Committee (SAC/TC355):

This document was drafted by: China Petroleum and Natural Gas Pipeline Research Institute Co:, Ltd:, China Petroleum Pipeline Bureau Engineering Co:, Ltd:, China Petroleum Group Engineering Technology Research Co:, Ltd:, National Oil and Gas Pipeline Network Group Co:, Ltd: Construction Project Management Branch, Sinopec Petroleum Engineering Construction Co:, Ltd:, National Pipeline Network Group Northern Pipeline Co:, Ltd:, Tianjin University:

The main drafters of this document: Sui Yongli, Yang Die, Yan Chen, Deng Jun, Xue Yan, Wang Feng, Chang Liang, Lu Fenghua, Li Zengzhen, Zhang Shuli, Yu Linchuan, Liu Quanli, Zhou Guangyan, Bruce Lee, Tang Riguang, Jiang Xiaohong, Li Jingchang, Liu Shaozhu, Lu Xiangyang, Wang Pengyu:

This document was first published in:2014 and this is the first revision:

Steel pipeline welding and acceptance

1 Scope

This document specifies the carbon steel and low alloy materials for long-distance pipelines and gathering pipelines for crude oil, refined oil, natural gas, carbon dioxide, nitrogen and other media:

Arc welding process for butt joints, corner joints and socket joints of steel pipes and fittings:

The welding methods applicable to this document are electrode arc welding, submerged arc welding, melting and non-melting electrode gas shielded arc welding, and flux-cored wire arc welding, plasma arc welding or a combination thereof: The welding method is manual welding, semi-automatic welding, motorized welding, automatic welding or a combination thereof: The welding position is fixed welding, spin welding or a combination thereof:

This document also specifies radiographic inspection of welded joints, X-ray digital imaging inspection, X-ray computer-aided imaging inspection, magnetic particle inspection Testing, penetrant testing, ultrasonic testing, fully automatic ultrasonic testing, phased array ultrasonic testing and acceptance requirements for destructive testing:

This document is applicable to the welding of newly built, renovated and expanded pipelines and pipelines in service:

2 Normative reference documents

GB/T 226

GB/T 228

GB/T 229

GB/T 2653

GB/T 3091

GB/T 4157

GB/T 4340

GB/T 5117

GB/T 5293

GB/T 5310

GB/T 6479

GB/T 8110

GB/T 8163

GB/T 8650

GB/T 9711

GB/T 10045

GB/T 13401

GB/T 14383

GB/T 20972

GB/T 28896