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Title: Magnetic Flux Leakage Technology For Pipeline Inspection
Author: J. Bruce Nestleroth, Thomas A. Bubenik, Robert J. Eiber
Source: American Gas Association 1992
Year Published: 1992
Abstract: Magnetic flux leakage (MFL) is the most commonly used technology for the in-line inspection (ILl) of natural gas transmission pipelines. There are many classes of pipeline imperfections or defects. Magnetic inspection systems to detect most of these imperfections either exist or have the strong potenial for being developed. Once imperfections are detected, characterization of the defect geometry becomes important. Many variables affect characterization accuracy and the current research challenge is to understand the effect of these variables. The primary focus of the NDE Laboratory of the GRI Pipeline Research Facility has been to develop a knowledge base on magnetic flux leakage so that improved charaterization systems can be developed. This paper begins with a review the basic concepts of magnetic flux leakage for the detection and characterization of pipeline imperfections. Then, a general overview of the factors that effect the application of MFL inspection including pipeline constraints is presented.

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