埋地输气管线腐蚀综合评价

为了保证输气管道的安全平稳运行，通过对某沙漠地区输气管线的腐蚀情况进行综合评价，包括PCM检测，阴极保护有效性检测，管体内腐蚀缺陷检测、成像与剩余强度评价以及剩余寿命评价。结果表明，该埋地输气管线的外防腐层存在漏点80个，阴极保护全部达标，管体外表面腐蚀是由防腐层破损而引起的，管体壁厚减薄处最小值为5.45 mm，该管道腐蚀缺陷在接受范围内，管道平均腐蚀速率较低。

Comprehensive Assessment for the Corrosion of Buried Gas Pipeline

To ensure the gas pipeline running safely and smoothly, this paper focused on a comprehensive assessment for the corrosion of a gas pipeline in desert area by the methods of PCM detection, cathodic protection system detection, internal corrosion defect detection, imaging and residual strength valuation and remaining lifetime assessment. The results showed that there are 80 leak sources on the external anti-corrosion coating, the cathodic protection system is qualified, the external surface corrosion of the pipeline is caused by coating damages, the outer surface corrosion of pipe body is caused by coating damage, the minimum wall thickness of the pipeline is 5.45 mm, the corrosion defects on the pipeline are acceptable and the average corrosion rate is low.