关键词: 无损检测, 管道, 厚度, 电磁超声

Abstract:

To solve the problem of pipe thickness online nondestructive testing in the explosive surroundings of oil refinery area, a novel EMAT system with maximum lift-off value of 6 mm has been developed in the way of focusing magnetic field and optimizing the testing coil. Experiment results show that the testing accuracy was less than 0.05 mm for standard test block with thickness of 22 mm and the serviced pipeline with thickness of 12.16 mm when the condition of liftoff value was less than 6 mm. The developed EMAT system in this work can satisfy the requirement of pipeline thickness detection in the refining factory, which provides the ability of explosionproof design and certification for EMAT technology.

Key words: nondestructive testing, pipe, thickness, electromagnetic acoustic transducer(EMAT