In view of a long-distance buried gas transmission pipeline,several girth weld anomalies were found during the internal magnetic flux leakage(MFL)detection of the pipeline.According to the excavation verification of one of the girth welds anomalies,the result of X-ray and ultrasonic nondestructive testing is grade IV,and the result is acceptable after applicability evaluation without considering geological subsidence.In view of the geological subsidence,pressure fluctuation and external environment change,the repair measures of B-type sleeve are put forward.After repair,the welding quality is tested by non-destructive testing means,and the test results are qualified.
girth weld defectB-type sleeve repairlong-distance buried gas transmission pipeline
万方数据
维普
