某净化油长输管道已服役36年，经前期外防腐蚀完整性检测评价确认，该管道外防腐蚀层存在大量破损点，且管道部分区段阴极保护处于欠保护状态。为进一步了解该管道管体的腐蚀与安全现状，利用瞬变电磁技术对该管道的管体腐蚀剩余平均壁厚实施了非开挖外检测，并对局部更换后的老管段样品进行了理化性能分析。结果表明，该管道管体腐蚀状况轻微，材质未发生劣化，管道服役前期性能良好的外防腐蚀层和管道服役中后期有效的阴极保护系统对抑制管道腐蚀起到了关键作用。
The outside anti corrosion integrity test was used to assess a long-distance pipeline of oil purification which had worked for thirty-six years. The results showed that there were many leaking points and parts of pipe were in under-protection. In order to further understand the corrosion and safety situation of pipe body, transient electric magnetic technology was used to inspect the average thickness of pipe body, and physical and chemiscal analyses were used for the old pipe. The results indicated that slight corrosion was observed, both the outside anti-corrosion and effective cathodic protection were very important.
参考文献
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