Development and Application of Ultrasonic Automatic Flaw Detection System for Oil and Gas Pipeline Submerged Arc Welded Steel Pipe

The structure, inspection theory and construction scheme of an ultrasonic automatic flaw detection system for oil and gas pipeline submerged arc welded steel pipe, together with its application, are introduced. It uses the modular structure and can be any combination of 1 to N channels of a multi-channel digital ultrasonic automatic flaw detection system. With the careful program of flaw detection operation, it can evaluate correctly and select strictly for complex flaw echo, and its error in alarm can be effectively avoided. The review of flaw echo waveform overcomes insufficiency of flaw category nondescript in ultrasonic automatic inspection, and achieves misinformation rate smaller than 2%, fail to report rate to 0.