长输管道阴极保护技术难点及应对方法

Technical Difficulties and Countermeasures of Cathodic Protection for Long Distance Pipeline

中国新建管道多敷设于恶劣环境地区,对管道安全运行提出更高要求,腐蚀是管道失效的重要原因。阐述了近年来管道腐蚀防护的技术难点和瓶颈问题,包括阴极保护准则、阴极保护电位测试、高寒区管道阴极保护、阴极保护系统维护、三层结构聚乙烯(3LPE)防腐层剥离、保温层下腐蚀、含套管穿越管道阴极保护等方面。结合国内外管道工程实践、标准规范和技术现状,提出了可行、合理的应对方法及措施。针对提高国内管道安全管理水平,提出了管道阴极保护技术未来的科研攻关建议。

Newly constructed pipeline are mainly laid in harsh environment area in China.Pipeline safe operation requirement is becoming stricter.Corrosion is an important cause of pipeline failure.The technical difficulties and bottlenecks of pipeline corrosion protection in recent years are listed,including cathodic protection criteria,cathodic protection potential test,pipeline cathodic protection in extremely cold regions,cathodic protection system maintenance,three-layer-polyethylene(3LPE)anti-corrosion coating stripping,corrosion under insulation,cathodic protection of pipeline crossing with casing.Combined with the domestic and foreign pipeline engineering practice,standards and technical status,the feasible and reasonable response methods and measures are put forward.In order to improve pipeline safety management in China,some suggestions for tackling key problems in pipeline cathodic protection technology in the future are put forward.