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GB/T 46424-2025Failure analysis method for oil and gas transportation pipeline girth welds (English PDF)

油气输送管道环焊缝失效分析方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 5, 2025

Implementation date

May 1, 2026

Scope

GB/T 46424-2025 is the English-translated version of 油气输送管道环焊缝失效分析方法.

GB/T 46424-2025 is the Chinese standard "Failure analysis method for oil and gas transportation pipeline girth welds".

Its scope clause reads: This document establishes the process for failure analysis of circumferential welds in steel pipelines used for onshore oil and gas transportation, and specifies the procedures for information collection and failure analysis scheme preparation.

This includes review, on-site sampling and sample protection, testing and analysis, failure analysis conclusions and reports, and storage of failure analysis samples and remaining samples.

This document applies to the failure analysis of circumferential welds in steel pipelines used for onshore oil and gas transportation. Its clauses include terms and definitions.

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Document preview — GB/T 46424-2025

National Standard of the People's Republic of China

ICS: 75.200
Classification: E 98

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Failure Analysis Process
5.Information Collection 3.
5.1 General Rules
5.2 On-site environmental information collection
5.3 Design and Construction Information Collection
5.4 Operation and Maintenance Information Collection
6.Failure Analysis Plan Development and Review
7.On-site sampling and sample protection
7.1 On-site sampling
7.2 Sample Protection
8.Testing and Analysis 5.
8.1 General Rules
8.2 Macroscopic Testing and Analysis
8.3 Physicochemical Performance Testing and Analysis
8.4 Microscopic observation and analysis of the fracture surface
8.5 Failure Simulation and Analysis
9.Failure Analysis Conclusions and Report
10.Failure analysis test specimens and remaining sample storage
Appendix A (Informative) Failed Circumferential Weld Information Collection Form
Appendix B (Informative) Failure Analysis Sampling Record Table
Appendix C (Informative) Failure Analysis Test Data Recording Table
Appendix D (Normative) Method for Determining the Ductile-Brittle Transition Temperature of Circumferential Welds
Appendix E (Normative) Hardness Test Method for Arrayed Circumferential Welds
References

1 Scope

This document establishes the process for failure analysis of circumferential welds in steel pipelines used for onshore oil and gas transportation, and specifies the procedures for information collection and failure analysis scheme preparation.

This includes review, on-site sampling and sample protection, testing and analysis, failure analysis conclusions and reports, and storage of failure analysis samples and remaining samples.

This document applies to the failure analysis of circumferential welds in steel pipelines used for onshore oil and gas transportation.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 228.1 Metallic materials - Tensile testing - Part 1.Test method at room temperature

GB/T 229 Metallic materials Charpy impact test method

GB/T 2650 Destructive testing of welds in metallic materials - Impact test

GB/T 2651 Destructive testing of welds in metallic materials - Transverse tensile test

GB/T 2652 Destructive testing of welds in metallic materials - Longitudinal tensile test of weld metal in fusion welded joints

GB/T 2653 Test method for bending of welded joints

GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1.Test method

GB/T 4340.2 Metallic materials - Vickers hardness testing - Part 2.Inspection and calibration of hardness testers

GB/T 4340.3 Metallic materials - Vickers hardness test - Part 3.Calibration of standard hardness blocks

GB/T 9711 Steel pipes for pipeline transportation systems in the oil and gas industry

GB/T 10561 Determination of Non-metallic Inclusion Content in Steel - Standard Rating Chart Microscopic Examination Method

GB/T 13298 Examination Methods for Metallic Microstructure

GB/T 28896 Test Method for Determination of Quasi-Static Fracture Toughness of Welded Joints of Metallic Materials

GB/T 31032 Welding and Acceptance of Steel Pipelines

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 girthweld

Circumferential welded butt joint of steel pipe.

Note. This includes the weld metal, fusion line, and heat-affected zone, also known as the weld joint.

3.2 failure

The circumferential weld has lost or partially lost the functions specified in the original design, and is completely unable to serve, or can still serve but cannot operate safely and reliably.

The state.

Note. Common failure modes of circumferential welds include plastic instability, corrosion, fatigue, and fracture.

GB/T 23258 | GB/T 21447 | GB 50341 | GB/T 21446 | GB/T 46423 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 34 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 46424

Edition	Title	Revision	Status
GB/T 46424-2025	Failure analysis method for oil and gas transportation pipeline girth welds	current edition	Current

This page sells the current edition, GB/T 46424-2025. Earlier editions are listed for reference only.

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