在役输气管道分层缺陷无损检测及安全评价

针对在役输气管道内检测过程中发现的管体异常金属损失现象,采用超声斜探头探伤、C扫描等方法对管道异常处进行了检测与分析,给出了管道缺陷适用性评价方法 ,并对检测到的缺陷进行了安全评价。结果表明,该处缺陷为内部分层缺陷,不能满足API 579—2007对管道分层缺陷1级评价的要求,建议更换管道或采用复合材料对管体进行补强修复,并加强管道原材料、制管过程和服役过程中的检测和评价,确保管道的安全运行。

Non-destructive Inspection and Safety Evaluation for Lamination Defect of Gas Transportation Pipeline on Service

For the abnormal wall thickness metal loss of gas transportation pipelines on service, which found in pipeline inspection, it adopted ultrasonic angle probe and C-Scan technologies to detect and verify, gave the applicable evaluation method for pipeline defects, and carried out evaluation for the detected defects. The result indicated that the defect is internal lamination defect, which cannot meet level 1 assessment requirements for pipeline lamination defect in API 579—2007. It suggested changing pipeline or adopting composite materials to conduct reinforcement and repair, and should strengthen detection and evaluation for pipeline raw material, manufacturing process and service process, to ensure pipeline safe operation.