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GB/T 40377-2021: Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria
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Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria
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GB/T 40377-2021
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Basic data | Standard ID | GB/T 40377-2021 (GB/T40377-2021) | | Description (Translated English) | Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H25 | | Word Count Estimation | 38,358 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 40377-2021: Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria
---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.
Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria
ICS 77.060
CCSH25
National Standards of People's Republic of China
Corrosion of metals and alloys
Determination of protection criteria for AC corrosion
(ISO 18086.2019,MOD)
Released on 2021-08-20
2022-03-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
Introduction Ⅱ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Working ability of cathodic protection personnel 4
5 Evaluation of the impact of communication 4
6 Evaluation of the possibility of AC corrosion 5
7 Acceptable interference level 7
8 Testing Technology 8
9 Mitigation measures 11
10 Debugging 13
11 Monitoring and maintenance 14
Appendix A (informative) Technical differences between this document and ISO 18086.2019 and their reasons 16
Appendix B (Informative) Influence of soil characteristics on AC corrosion process 17
Appendix C (informative) Other criteria applied in the presence of AC interference 18
Appendix D (informative) Test strips and probes 21
Appendix E (Informative) Coulomb oxidation 26
Appendix F (Informative) Brief Description of AC Corrosion Phenomenon 27
Appendix G (Informative) AC Corrosion Data Graph 29
Appendix H (Informative) High-speed synchronous measurement of current density of test piece 30
Appendix I (Informative) Method for determining the position of remote reference electrode 32
Appendix J (Informative) Parameters to be considered when choosing a DC decoupling device 33
References 34
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document uses the redrafting method to amend and adopt ISO 18086.2019 ``Corrosion of metals and alloys.
but".
Compared with ISO 18086.2019, this document has structural adjustments.
---Informative appendix A "Technical differences between this document and ISO 18086.2019 and their reasons" and informative appendix G "communication
Atlas of Flow Corrosion Data";
---Adjust the original Appendix A, Appendix B, Appendix C, Appendix E, Appendix F, Appendix G to Appendix F, Appendix D, Appendix E, Appendix B, Appendix
Record C, Appendix J, Appendix I.
Compared with ISO 18086.2019, this document has technical differences.
The set vertical single line (|) is marked, and Appendix A gives a list of the corresponding technical differences and their reasons.
This document has made the following editorial changes.
---Added the description of the symbols in the formula;
---Added references [9]~[28].
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
Drafting organizations of this document. Anke Engineering Technology Research Institute (Beijing) Co., Ltd., University of Science and Technology Beijing, Metallurgical Industry Information Standards Institute,
National Petroleum Pipeline Network Group Co., Ltd., National Petroleum Pipeline Network Group Co., Ltd. West-East Gas Transmission Branch, National Pipeline Network Group
Western Pipeline Co., Ltd., PetroChina Beijing Natural Gas Pipeline Co., Ltd., Beijing Anke Corrosion Technology Co., Ltd.
The main drafters of this document. Wang Xiuyun, Du Yanxia, Hou Jie, Feng Qingshan, Wang Zhensheng, Cao Guofei, Zhao Kang, Ge Aitian, Tian Zijian, Feng Wei,
Li Zhenjun, Liu Dianyu, Liu Quan, Bi Wuxi, Wu Guangchun, Chen Shaosong, Lu Minxu, Sun Menghan, Liang Yi.
Introduction
This document integrates the guidelines, thresholds, and experience from the latest data. The methods of communicating corrosion protection vary from country to country.
This mainly depends on the situation of DC interference. These different methods are considered from two different situations.
--- In the case of "positive" energization potential, allow a certain level of AC voltage (up to 15V);
---In the case of "negative" power-on potential (for example, there is DC stray current interference on the pipeline), the AC voltage needs to be reduced to the limit
Low volume level.
This document also gives the parameters that need to be considered when evaluating the possibility of communication corrosion, as well as detailed test techniques, mitigation measures, and communication corrosion.
Tests that should be carried out during the commissioning of the erosion mitigation system. Note that other parameters and thresholds suggested in Appendix C need to be further based on practical experience
confirm.
Corrosion of metals and alloys
Determination of protection criteria for AC corrosion
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 ACelectrictraction 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.
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