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GB/T 36701-2018Guideline for defect repair of buried steel pipelines (English PDF)

埋地钢质管道管体缺陷修复指南

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

September 17, 2018

Implementation date

March 1, 2019

Scope

GB/T 36701-2018 is the English-translated version of 埋地钢质管道管体缺陷修复指南.

GB/T 36701-2018 is a Chinese national guide to repairing defects in the pipe body of buried steel pipelines. It sets out the repair methods and how to carry them out, from general requirements and data collection to common repair methods, the repair of typical defects, health, safety and environment, and quality acceptance.

Annexes deal with in-service welding on pipelines, composite reinforcement repair and the repair process for typical defects. It defines repair pressure and separates permanent repairs, which keep the pipeline reliable for its whole life, from temporary ones.

It applies to buried long-distance and gathering pipelines of grade L485/X70 and below, and other buried steel pipelines of those grades may follow it. It was issued on 17 September 2018 and has applied since 1 March 2019.

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Document preview — GB/T 36701-2018

National Standard of the People's Republic of China

ICS: 23.040.10
Classification: E 98

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

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 General requirements
5 Data collection
6 common repair methods
7 Repair of typical defects
8 Health, safety, environment
9 Quality acceptance and post work
Appendix A (Normative) Pipeline in-service welding operations
Appendix B (informative) Data Collection Table
Appendix C (Normative) Composite Reinforcement Repair Requirements
Appendix D (informative) Repair process for typical defects of buried steel pipelines

Foreword

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

1 Scope

This standard specifies the methods and implementation procedures for the repair of buried steel pipe body defects.

This standard is applicable to the repair of buried steel long-distance pipelines and gathering pipelines of L485/X70 and below steel grades, L485/X70 Other buried steel pipelines of the following steel grades may be implemented in accordance with this standard.

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 8923.1-2011 Determination of surface cleanliness of steels before coatings -- Part 1. uncoated Corrosion grade and treatment grade of the steel surface and the surface of the steel after the original coating is completely removed

GB/T 23257 buried steel pipeline polyethylene anti-corrosion layer

GB/T 28055 Steel Pipe Pressure Sealing Technical Specification

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

GB/T 31032-2014 Welding and acceptance of steel pipelines

GB 50251 gas pipeline engineering design specification

GB 50253 Oil Pipeline Engineering Design Specification

GB 50369 Oil and Gas Long Distance Pipeline Engineering Construction and Acceptance Specifications

NB/T 47013.2 Non-destructive testing of pressure equipment - Part 2. Radiographic testing

NB/T 47013.3 Non-destructive testing of pressure equipment - Part 3. Ultrasonic testing

NB/T 47013.4 Non-destructive testing of pressure equipment - Part 4. Magnetic particle testing

NB/T 47013.5 Non-destructive testing of pressure equipment - Part 5. Penetration testing

SY/T 4109 Non-destructive testing of oil and gas steel pipelines

SY/T 5918 Buried steel pipeline external anti-corrosion layer insulation layer repair technical specification

SY/T 6444 Petroleum Engineering Construction Safety Regulations

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Repair pressure

The operating pressure of the pipe at the defect at the time of repair.

3.2 Permanent repair

Repairs to ensure reliable operation of the pipeline throughout its life cycle.

3.3 Temporary repair

Repairs that ensure that the pipeline runs reliably for a certain period of time, and will be permanently repaired and replaced as appropriate.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 47924-2026|GB/T 28713-2023|GB/T 24596-2021|GB/T 37357-2019|GB/T 37368-2019|GB/T 37369-2019

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