穿越段埋地管道加设了套管的部位发生腐蚀的情况往往比其他部位严重.论述了钢质套管对阴极保护系统的影响及其原因,并对目前普遍采用的套管内安装牺牲阳极的做法的局限性进行了分析,就取消套管穿越措施的可行性和套管穿越段管道腐蚀控制工程的设计要点进行了探讨.
Corrosion in casing crossing section of buried steel pipe is more serious than in other parts.The influence of steel casing on the cathodic protection system and its causes are discussed.And the limitation for the method of installing sacrificial anode cathode in casing,which is widely used,is analyzed.The feasibility of cancelling casing and the key points in corrosion control engineering design for pipeline in casing crossing section are discussed as well.
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