A feed-through ACFM probe with sensor array for pipe string cracks inspection

摘要

Pipe string is highly susceptible to cracks caused by stress corrosion and fatigue damage in petroleum industry. The performance of existing magnetic flux leakage and magnetic particle inspection is inadequate to detect narrow axial cracks in pipe string. Results obtained from crack inspection simulations and experiments using a novel feed-through alternating current field measurement (ACFM) probe presented in this paper suggest that this probe can be adopted for an accurate, rapid and non-contacting detection of pipe string cracks. A structure of equal-spaced sensor array of this feed-through ACFM probe is applied to scan the full circumference of pipe string simultaneously in a single pass.