ISO 21857:2021 石油、石化和天然气工业 杂散电流影响的管道系统的腐蚀预防

标准编号：ISO 21857:2021

中文名称：石油、石化和天然气工业 杂散电流影响的管道系统的腐蚀预防

英文名称：Petroleum, petrochemical and natural gas industries — Prevention of corrosion on pipeline systems influenced by stray currents

发布日期：2021-03

标准范围

本文件确立了交流和直流电气干扰对埋地或浸入式管道系统外表面杂散电流腐蚀影响的评估和最小化的一般原则。本文件不包括其他杂散电流影响，如过热和对焊接操作的干扰。本文简要介绍了交流效应、一般原理和一些指导原则。注1:交流对埋地或浸入式管道的影响见ISO 18086。也可能受到杂散电流影响的系统包括埋置或浸入式金属结构，例如:a） 管道系统；b） 金属护套电缆；c） 坦克和船只；d） 接地系统；e） 混凝土中的钢筋；f） 钢板桩。本文件为-可能产生杂散电流的阴极保护系统的设计，-埋地或浸没的管道系统或管道系统元件的设计，以及-选择适当的保护或缓解措施。本文件未详细讨论杂散电流的内部腐蚀风险，但此处描述的原则和措施可用于将干扰影响降至最低。注2:EN 50443、IEC 61140、IEC 60364-4-41、IEC 60479-1、IEC 60364-5-52、IEC/TS 61201和IEC/TR 60479-5涵盖了电磁干扰对管道系统地面附件的影响。本文件也可用于石油化工和天然气行业以外的管道系统以及其他埋地或浸入式结构。注3:EN 50162为铁路相关结构提供了指南。

This document establishes the general principles for the evaluation and minimization of the effects of stray current corrosion on external surfaces of buried or immersed pipeline systems caused by AC and DC electrical interference.Other stray current effects such as overheating, and interference with welding operations are not covered in this document.A brief description of AC effects, general principles and some guidelines, are provided.NOTE 1 See ISO 18086 for the effects of alternating current on buried or immersed pipelines.Systems that can also be affected by stray currents include buried or immersed metal structures such as the following:a) pipeline systems;b) metal sheathed cables;c) tanks and vessels;d) earthing systems;e) steel reinforcement in concrete;f) sheet steel piling.This document gives guidelines for— the design of cathodic protection systems that might produce stray currents,— the design of pipeline systems, or elements of pipeline systems, which are buried or immersed, and which can be subject to stray current corrosion, and— the selection of appropriate protection or mitigation measures.Internal corrosion risks from stray currents are not dealt with in detail in this document but principles and measures described here can be applicable for minimizing the interference effects.NOTE 2 The impact of electromagnetic interference on above-ground appurtenances of pipeline systems is covered in EN 50443, IEC 61140, IEC 60364-4-41, IEC 60479-1, IEC 60364-5-52, IEC/TS 61201 and IEC/TR 60479-5.This document can also be used for pipeline systems outside of the petrochemical and natural gas industries and other buried or immersed structures.NOTE 3 EN 50162 provides guidance for railway related structures.

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