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GB/T 36676-2018External inspection methodology of stress corrosion cracking (SCC) for buried steel pipelines (English PDF)

埋地钢质管道应力腐蚀开裂(SCC)外检测方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

September 17, 2018

Implementation date

April 1, 2019

Scope

GB/T 36676-2018 is the English-translated version of 埋地钢质管道应力腐蚀开裂(SCC)外检测方法.

GB/T 36676-2018 sets out the external inspection method for stress corrosion cracking (SCC) of buried steel pipelines. The method runs through data collection, analysis of the factors that make a pipeline sensitive to SCC, prediction of where cracking is likely, excavation and examination, assessment and disposal, and records and reports.

It applies to buried long-distance, gathering and public pipelines, and only to cracking caused by the external environment, not by the conveyed medium. Defined terms include high pH SCC and near-neutral pH SCC.

Annexes cover data collection, SCC sensitivity analysis and assessment, the SCC-sensitive potential range in soil, and methods to measure and predict crack growth rate, including under alternating load. It was issued on 17 September 2018 and has applied since 1 April 2019.

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Document preview — GB/T 36676-2018

National Standard of the People's Republic of China

ICS: 23.040.01
Classification: E 16

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

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 General
5 Data Collection
6 SCC sensitive factor analysis
7 SCC Position Prediction
8 Excavation test
9 Assessment and Disposal
10 Records and reports
Appendix A (informative) Data collection
Appendix B (Normative) SCC Sensitivity Analysis and Assessment
Appendix C (informative appendix) Method for determining SCC sensitive potential interval in soil environment
Appendix D (informative) Experimental method for determining the crack growth rate of SCC pipe sections
Appendix E (informative appendix) Prediction method for crack growth rate of SCC pipe segments under alternating load
Reference

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the external detection method for stress corrosion cracking (SCC) of buried steel pipelines, including data collection and SCC sensitive factors. Analysis, SCC position prediction, excavation detection, assessment and disposal, recording and reporting.

This standard is applicable to buried steel pipelines in long-distance pipelines, gathering pipelines and public pipelines. Other buried steel pipelines can be referred to. The relevant provisions of this standard are implemented.

This standard is only applicable to stress corrosion cracking caused by the external environment of buried steel pipelines, and is not suitable for stress corrosion caused by conveying medium. Eclipse cracking.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 19285 buried pipeline corrosion protection engineering inspection

GB/T 19624 Safety assessment of pressure vessels containing defects

GB/T 24196 Corrosion Electrochemical Test Methods for Metals and Alloys - Guide to Constant Potential and Potent Potential Polarization Measurements

GB/T 27699 Steel pipe inspection technical specification

GB/T 27921 Risk Management Risk Assessment Technology

GB/T 30582 Risk-based inspection and evaluation of external damage of buried steel pipelines

GB 32167 Specification for the integrity management of oil and gas pipelines

NB/T 47013 Non-destructive testing of pressure equipment

TSGD7003 Pressure Pipeline Inspection Rule - Long Distance Pipeline

TSGD7004 Pressure Pipeline Inspection Rule - Utility Pipeline

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Stress corrosion cracking

Cracking caused by the combination of tensile stress and corrosive environment of metallic materials.

3.2 High pH SCC

A form of stress corrosion cracking of a buried pipeline caused by an external alkaline electrolyte environment.

Note: The crack appears as cracking along the crystal and has a distinct bifurcation.

3.3 Near-neutral pH SCC

A form of stress corrosion cracking of a buried pipeline caused by an external near-neutral pH electrolyte environment.

Note: Cracks generally appear as transgranular cracking, less bifurcation, corrosion at the crack or pipe surface.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 23 pages — is available in the English PDF.

Referenced standards

Normative references

NB/T 47013

Cited by

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GB/T 27512-2025|GB/T 19285-2026|GB/T 47414-2026|GB/T 47569-2026|GB/T 47763-2026|GB/T 47924-2026

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