A study on the measurement of axial cracks in the Magnetic Flux Leakage NDT system

Author

Hui Min Kim ; Yong Woo Rho ; Hui Ryong Yoo ; Sung Ho Cho ; Dong Kyu Kim ; Sung Ja Koo ; Gwan Soo Park

Author_Institution

Dept. of Electr. Eng., Pusan Nat. Univ., Busan, South Korea

fYear

2012

fDate

20-24 Aug. 2012

Firstpage

624

Lastpage

629

Abstract

Among the nondestructive testing methods, the MFL(Magnetic Flux Leakage) PIG(Pipelines 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 occurred 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 MFL) 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 field is analyzed by using finite element method. Also, by simulating and measuring the magnetic leakage field, it is possible to detect of axial cracks in the pipeline.

Keywords

corrosion; crack detection; finite element analysis; gauges; inspection; magnetic field measurement; magnetic flux; magnetic leakage; magnetic permeability; magnetic sensors; nondestructive testing; pipelines; CMFL; PIG; axial crack detection; axial crack measurement; circumferential MFL; corrosion; crack shaping; exterior-interior pressure difference; finite element method; magnetic field measurement; magnetic flux leakage NDT syste; magnetic permeability; metal loss detection; nondestructive testing method; pipeline inspection gauge; pipelines testing; Magnetic field measurement; Magnetic fields; Magnetic flux leakage; Magnetic sensors; Pipelines; Saturation magnetization;

fLanguage

English

Publisher

ieee

Conference_Titel

Automation Science and Engineering (CASE), 2012 IEEE International Conference on

Conference_Location

Seoul

ISSN

2161-8070

Print_ISBN

978-1-4673-0429-0

Type

conf

DOI

10.1109/CoASE.2012.6386507

Filename

6386507