埋地钢质管道外防腐层电阻率测量存在的问题及建议  

Problems and Suggestions in the Resistivity Measurement of the External Anti-Corrosion Coating of Buried Steel Pipelines

作　　者：钟友川 伍红军 谢军 陈振 王超 刘震军 沈兴 赵勇 王忠祥 张金伟 ZHONG You-chuan;WU Hong-jun;XIE Jun;CHEN Zhen;WANG Chao;LIU Zhen-jun;SHEN Xing;ZHAO Yong;WANG Zhong-xiang;ZHANG Jin-wei(PipeChina Sichuan East Natural Gas Transmission Pipeline Co.,Ltd.,Nanjing 211106,China;China Petroleum Pipeline Research Institute Co.,Ltd.,Langfang 065000,China)

机构地区：[1]国家管网集团川气东送天然气管道有限公司,江苏南京211106 [2]中国石油天然气管道科学研究院有限公司,河北廊坊065000

出　　处：《材料保护》2023年第2期157-163,174,共8页Materials Protection

摘　　要：埋地钢质管道防腐层电阻率是一个重要参数,近年来通过测量该参数值来评价在役或定向钻管道施工完防腐层整体质量。对该参数的现场测量及防腐层整体质量评价,国内相关标准均参考NACE TM 0102-2002制定。但目前国内相关标准对“防腐层电阻率”该概念阐述不明以及与“防腐层电阻率”相关术语存在混淆现象,各标准对防腐层电阻率的测量未明确选择通用法和衰减法的原因,对定向钻穿越管道使用通用法时也未规定土壤电阻的测试位置,导致各检测单位对同一管道外防腐层电阻率的现场测试结果和评价结论存在差异。为明确上述问题,首先对防腐层电阻率相关的概念进行阐述,通过理论分析和公式推导明确防腐层电阻率的意义,并对100处定向钻穿越管道的防腐层电阻率的测量结果进行了统计,最后给出了针对相关标准的修改建议,以期新版标准对不明确的问题进行修订。The resistivity of the anti-corrosion coating of buried steel pipeline is an important parameter.In recent years,the value of this parameter has been used to evaluate the overall quality of the anti-corrosion coating of in-service or directional drilling pipelines.All the domestic standards regarding the on-site measurement of this parameter and the evaluation of the overall quality of the anti-corrosion coating are established with reference to NACE TM 0102-2002.However,those domestic standards have not explained the concept of"anti-corrosion coating resistivity"clearly and there is confusion with terms related to"anti-corrosion coating resistivity".The reasons for selecting the general method and the attenuation method are not defined clearly for the measurement of the resistivity of anti-corrosion coating in various standards,and the test location of the soil resistance is not specified when the general method is used for the directional drilling crossing pipeline,resulting in differences in the field test results and evaluation conclusions of the resistivity of the anti-corrosion coating outside the same pipeline by various inspection units.In order to clarify the above problems,the concepts related to the resistivity of the anti-corrosion coating were explained firstly,and then the meaning of the resistivity of the anti-corrosion coating was clarified through theoretical analysis and formula derivation.Furthermore,the measurement results of the resistivity of the anti-corrosion coating of 100 directional drilling crossing pipelines were statistically analyzed.Finally,suggestions on the revision of relevant standards were given,with expect to revise the unclear problems in the new version of the standards.

关 键 词：防腐层电阻率 定向钻穿越管道 通用法 衰减法 

分 类 号：TE832[石油与天然气工程—油气储运工程]