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GB/T 40377-2021Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 40377-2021 (Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria) is available as an English-translated PDF.

GB/T 40377-2021 is the Chinese standard "Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria". Its scope clause reads: This document specifies the limits, test procedures, mitigation measures and related information to evaluate the AC voltage between 16.7 Hz and 60 Hz.

The possibility of long-term interference and AC corrosion. This document applies to buried cathodic protection pipelines affected by AC traction systems and/or AC transmission lines.

This document does not apply to safety issues related to pipeline AC voltage. These safety issues are covered in other relevant standards and regulations (Such as EN50443).

Note 1.This document discusses the possibility of AC corrosion of metal pipes caused by AC interference caused by resistive, inductive or capacitive coupling of AC transmission systems, and The maximum allowable limit for the influence of these disturbances.

Mainly consider the long-term influence factors under the normal operation of the AC power system. Note 2.In the presence of AC interference, the protection criteria given in ISO 15589-1 are not sufficient to prove that the steel is effectively protected from corrosion. Its clauses include terms and definitions.

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Document preview — GB/T 40377-2021

National Standard of the People's Republic of China

Classification: H 25

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Working ability of cathodic protection personnel
5 Evaluation of the impact of communication
6 Evaluation of the possibility of AC corrosion
7 Acceptable interference level
8 Testing Technology
9 Mitigation measures
10 Debugging
11 Monitoring and maintenance
Appendix A (informative) Technical differences between this document and ISO 18086.2019 and their reasons
Appendix B (Informative) Influence of soil characteristics on AC corrosion process
Appendix C (informative) Other criteria applied in the presence of AC interference
Appendix D (informative) Test strips and probes
Appendix E (Informative) Coulomb oxidation
Appendix F (Informative) Brief Description of AC Corrosion Phenomenon
Appendix G (Informative) AC Corrosion Data Graph
Appendix H (Informative) High-speed synchronous measurement of current density of test piece
Appendix I (Informative) Method for determining the position of remote reference electrode
Appendix J (Informative) Parameters to be considered when choosing a DC decoupling device
References

1 Scope

This document specifies the limits, test procedures, mitigation measures and related information to evaluate the AC voltage between 16.7 Hz and 60 Hz.

The possibility of long-term interference and AC corrosion.

This document applies to buried cathodic protection pipelines affected by AC traction systems and/or AC transmission lines.

This document does not apply to safety issues related to pipeline AC voltage. These safety issues are covered in other relevant standards and regulations (Such as EN50443).

Note 1.This document discusses the possibility of AC corrosion of metal pipes caused by AC interference caused by resistive, inductive or capacitive coupling of AC transmission systems, and

The maximum allowable limit for the influence of these disturbances. Mainly consider the long-term influence factors under the normal operation of the AC power system.

Note 2.In the presence of AC interference, the protection criteria given in ISO 15589-1 are not sufficient to prove that the steel is effectively protected from corrosion.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB 4793.1 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1.General requirements (GB 4793.1-2007,

IEC 61010-1.2001, IDT)

GB/T 10123 Corrosion basic terms and definitions of metals and alloys (GB/T 10123-2001, eqvISO 8044.1999)

ISO 15589-1 Petroleum, petrochemical and natural gas industry pipeline system cathodic protection Part 1.Onshore pipelines (Petroleum, petrochemicalandnaturalgasindustries-Cathodicprotectionofpipelinesystems-Part 1.On-land pipelines)

EN50443 The influence of high-voltage AC traction system and/or high-voltage AC transmission system on pipeline electromagnetic interference (Effectsof electromagneticinterferenceonpipelinescausedbyhighvoltageACelectrictractionsystemsand/or highvoltageACpowersupplysystems)

3 Terms and definitions

The following terms and definitions defined in GB/T 10123 apply to this document.

3.1 AC electric traction system

AC railway distribution network used to provide energy for rail vehicles.

Note. The system can include the following parts.

--- Catenary system;

---Return line of electrified railway system;

---The running track of the non-electrified railway system is near and electrically connected to the running track of the electrified railway system.

GB/T 41653 | GB/T 40299 | GB/T 40393 | GB/T 17897 | GB/T 10127 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 64 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 61010 · ISO 15589

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