高温原油管道内外检测数据对比分析

Comparative analysis between internal and external inspection data for high temperature crude oil pipeline

以同一时期进行内外检测的某条原油管道A站至B站管段作为研究对象,对内检测发现的管道外腐蚀结果与外检测数据评价结果进行对比分析。结果表明:管道外腐蚀点远多于外防腐层缺陷点;由于阴极保护的作用,外防腐层缺陷点处管体良好,未见明显腐蚀;管道外腐蚀风险点在防腐层剥离的区域。可以利用内检测数据评价管道防腐层的剥离情况,现有的外检测技术具有局限性。针对外检测技术的局限性,提出在管道外检测及日常管理过程中,应加大直接开挖检查力度,对管道外防腐措施的有效性进行评价,以确保管道的安全运行。(图2,表1,参7)。

This paper targets at identifying the pros and cons of the internal and extemal inspection in evaluating external corrosion pipeline. Taking a section of certain crude oil pipeline from station A to station B as the studying object, a comparative analysis between the external corrosion pipe identified through the inside inspection and the data evaluation results from external inspection is conducted. The results show that the corrosion pits outside the pipeline are far more than the defect points in the external coating. Due to cathodic protection, the pipe body at the defect points is good, without obvious corrosion. The corrosion risk points outside the pipeline are distributed in the disbonding coating area. The internal inspection data can be used to evaluate the coating disbonding degree, while existing extemal inspection techniques have some limitations. In view of the limitations, it is proposed that in the external inspection and daily management of pipeline, direct excavation should be done in larger scale to evaluate the effectiveness of external corrosion control measures of the pipeline to make sure safe operation. （2 Figures, 1 Table, 7 References）