Abstract
Pipeline-defect measurements by high-resolution magnetic flux leakage (MFL) in-line inspection tools are influenced by bending and line-pressure stresses. Tests conducted on a single 36-in. sample with a machined defect indicate that much further research into this phenomenon is needed to reveal methods for correcting for stress effects. The limited, preliminary tests reported in this article were conducted at Queen's University, Kingston, Ontario, and were supported by the Canadian Natural Sciences & Engineering Research Council and by Pipetronix, Toronto.
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