某电厂输送灰水的埋地钢管腐蚀穿孔导致泄漏频繁发生。对管道外防腐蚀层进行了质量评估和破损点的查找; 对土壤的腐蚀性、外部干扰电流等进行了检测。结果表明, 管道腐蚀的主要原因是: 较差的外防腐蚀层、较多的防腐蚀层破损点、强腐蚀性土壤、严重的干扰腐蚀和电偶腐蚀的共同作用等。提出了管道的维修措施: 对部分腐蚀严重的钢管进行更换, 对部分管道进行防腐蚀层大修, 并补加阴极保护。并对类似管道的埋设和维护提出了建议。

Serious corrosion and leakage of buried ash pipelines happened frequently in a power plant. The method of Pipeline Current Mapper(PCM) was used to assess the pipeline′s coating and inspect the leaking point. The soil corrosivity and the exterior interference current were examined separately. The results showed that the main reasons of pipeline corrosion were strong soil corrosivity, badly damaged outer coating of pipeline, serious external interference current corrosion and galvanic corrosion. Some suggestions were proposed to deal with the corrosion, induding the replacement partial pipelines and repair of the pipe and the coating, as well as cathodic protection. Several suggestions were proposed for the buried pipeline maintenance.