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GB/T 31032-2023: Welding and acceptance standard for steel pipings and pipelines
Status: Valid GB/T 31032: Evolution and historical versions
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Welding and acceptance standard for steel pipings and pipelines
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Basic data | Standard ID | GB/T 31032-2023 (GB/T31032-2023) | | Description (Translated English) | Welding and acceptance standard for steel pipings and pipelines | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | P94 | | Classification of International Standard | 75.200; 25.160.40 | | Word Count Estimation | 99,966 | | Date of Issue | 2023-12-28 | | Date of Implementation | 2024-04-01 | | Older Standard (superseded by this standard) | GB/T 31032-2014 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 31032-2023: Welding and acceptance standard for steel pipings and pipelines---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 75:200;25:160:40
CCSP94
National Standards of People's Republic of China
Replace GB/T 31032-2014
Steel pipeline welding and acceptance
Published on 2023-12-28
2024-04-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
Preface V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Abbreviations 4
5 Basic regulations 5
5:1 Welding equipment and appliances 5
5:2 Materials 5
5:3 Personnel 5
5:4 Welding process 6
5:5 Welding environment 6
6 Welding procedure qualification 6
6:1 General provisions 6
6:2 Recording 6
6:3 Process Specification 6
6:4 Basic elements of welding procedure qualification 8
6:5 Welding of test pipe joints---Butt welding 10
6:6 Test of welded joints---butt welding 10
6:7 Welding of test pipe joints---fillet welding 21
6:8 Test of welded joints---fillet welding 21
7 Welder qualifications 22
7:1 General provisions 22
7:2 Job examination 22
7:3 Individual Qualifications 23
7:4 Full qualification24
7:5 Examination of appearance inspection of welding joint 25
7:6 Destructive testing 25
7:7 Non-destructive testing of test weldments---only for butt welding 28
7:8 Make-up exam 28
7:9 Record 28
8 On-site welding 28
8:1 General provisions 28
8:2 Nozzle set 28
8:3 Requirements for the use of mouthparts 29
8:4 Bevel 29
8:5 Climatic conditions 29
8:6 Workspace 29
8:7 Interlayer cleaning 29
8:8 Welding 29
8:9 Welding joint marking 30
8:10 Preheating, interpass temperature, postheating and postweld heat treatment 30
9 Weld inspection and personnel qualification30
9:1 Inspection content 30
9:2 Inspection methods 30
9:3 Requirements for non-destructive testing personnel30
10 Non-destructive testing acceptance 30
10:1 Ray detection, X-ray digital imaging detection and X-ray computer-aided imaging detection 30
10:2 Magnetic particle testing 35
10:3 Penetration Detection 36
10:4 Ultrasonic testing, fully automatic ultrasonic testing and phased array ultrasonic testing 36
10:5 Visual inspection of undercut37
10:6 Visual inspection of recesses 38
11 Defect removal and repair 38
11:1 Crack 38
11:2 Non-crack defects38
11:3 Repair requirements 38
11:4 Rework welding process regulations 38
11:5 Basic elements of rework welding procedure qualification 39
11:6 Welding of butt weld test pipe joints 39
11:7 Testing of butt welded joints 39
11:8 Rework welder induction examination 42
11:9 Acceptance Criteria 44
12 Non-destructive testing methods 44
12:1 Ray detection 44
12:2 X-ray digital imaging detection 44
12:3 X-ray computer-aided imaging detection 44
12:4 Magnetic particle testing 45
12:5 Penetration Detection 45
12:6 Ultrasonic testing 45
12:7 Phased array ultrasonic testing 45
12:8 Fully automatic ultrasonic testing 45
13 Motorized welding with filler metal 45
13:1 Suitable welding methods 45
13:2 Welding procedure qualification 45
13:3 Record 46
13:4 Welding procedure specification 46
13:5 Basic elements of welding procedure qualification for motorized welding 46
13:6 Welding of butt weld test pipe joints 48
13:7 Motorized welding welder induction examination 49
13:8 Records of Qualified Motorized Welding Operators50
13:9 Inspection and testing of field welds 50
13:10 Non-destructive testing acceptance criteria 51
13:11 Repair and removal of defects 51
13:12 Ray detection 51
13:13 Ultrasonic testing 51
Appendix A (normative) Additional acceptance criteria for girth welds52
A:1 General 52
A:2 Stress Analysis 52
A:3 Welding process 53
A:4 Welder Qualification59
A:5 Detection and Acceptable Critical Dimensions 59
A:6 Record 68
A:7 Repair68
A:8 Symbol 68
Appendix B (Normative) In-Service Pipeline Welding Technology 70
B:1 General 70
B:2 Welding procedure qualification of in-service pipelines71
B:3 Welder qualifications for in-service pipelines 80
B:4 Recommended practices for in-service pipeline welding82
B:5 Inspection and testing of in-service pipeline welds 85
B:6 Non-destructive testing acceptance criteria (including visual inspection) 85
B:7 Weld repair of in-service pipelines85
Appendix C (Informative) Welding Record Form 87
Reference 92
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
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document:
GB/T 226 Acid etching inspection method for low magnification structure and defects of steel
GB/T 228:1 Tensile testing of metallic materials Part 1: Room temperature test methods
GB/T 229 Charpy pendulum impact test method for metal materials
GB/T 2653 Bending test method for welded joints
GB/T 3091 Welded steel pipes for low-pressure fluid transportation
GB/T 4157 Laboratory test methods for resistance to sulfide stress cracking and stress corrosion cracking of metals in hydrogen sulfide environments
GB/T 4340 (all parts) Vickers hardness test of metallic materials
GB/T 5117 Non-alloy steel and fine-grained steel welding rods
GB/T 5293 Classification requirements for solid wire, flux-cored wire and wire-flux combinations of non-alloy steel and fine-grained steel for submerged arc welding
GB/T 5310 Seamless steel pipes for high pressure boilers
GB/T 6479 Seamless steel pipe for high-pressure fertilizer equipment
GB/T 8110 Solid welding wire of non-alloy steel and fine-grained steel for gas metal arc welding
GB/T 8163 Seamless steel pipes for conveying fluids
GB/T 8650 Evaluation method for hydrogen-induced cracking resistance of pipeline steel and pressure vessel steel
GB/T 9711 Steel pipes for oil and gas industry pipeline transportation systems
GB/T 10045 Non-alloy steel and fine-grained steel flux-cored welding wire
GB/T 13401 Technical specifications for steel butt welded pipe fittings
GB/T 14383 Forged socket weld and threaded pipe fittings
GB/T 20972:2 Materials for hydrogen sulfide-containing environments in oil and gas extraction in the oil and gas industry Part 2: Anti-cracking carbon
Steel, low alloy steel and cast iron
GB/T 28896 Test method for quasi-static fracture toughness determination of welded joints of metallic materials
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