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http://dx.doi.org/10.4283/JKMS.2012.22.2.049

A Study on the Measurement of Axial Cracks in the Magnetic Flux Leakage NDT System  

Kim, Hui-Min (Dept. of Electrical Engineering, Pusan National University)
Park, Gwan-Soo (Dept. of Electrical Engineering, Pusan National University)
Rho, Yong-Woo (Korea Gas Corporation R&D Division)
Yoo, Hui-Ryong (Korea Gas Corporation R&D Division)
Cho, Sung-Ho (Korea Gas Corporation R&D Division)
Kim, Dong-Kyu (Korea Gas Corporation R&D Division)
Koo, Sung-Ja (Korea Gas Corporation R&D Division)
Publication Information
Journal of the Korean Magnetics Society / v.22, no.2, 2012 , pp. 49-57 More about this Journal
Abstract
From among the NDT (Non-Destructive Testing) methods, the MFL (Magnetic Flux Leakage) PIG (Pipeline Inspection Gauge) is especially suitable for testing pipelines because the pipeline has high magnetic permeability. MFL PIG showed high performance in detecting the metal loss and corrosions. However, MFL PIG is difficult to detect the crack which occured by exterior-interior pressure difference in pipelines and the shape of crack is very long and narrow. Therefore, the new PIG is needed to be researched and developed for detecting the cracks. The CMFL (Circumferential MF) PIG performs magnetic fields circumferentially and can maximize the magnetic flux leakage at the cracks. In this paper, CMFL PIG is designed and the distribution of the magnetic fields is analyzed by using 3 dimensional nonlinear finite element method (FEM). By Simulating and Measuring the magnetic leakage field, it is possible to detect of axial cracks in the pipeline.
Keywords
CMFL PIG; NDT (non-destructive testing); axial cracks; in-line inspection; FEM;
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