Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Design of RFECT System for Ferromagnetic Pipelines

강자성체 배관 탐상용 RFECT System의 설계에 관한 연구

  • Lee, Yu Ki (Dept. of Electrical and Computer Engineering, Pusan National University) ;
  • Kim, Hui Min (Dept. of Electrical and Computer Engineering, Pusan National University) ;
  • Park, Gwan Soo (Dept. of Electrical and Computer Engineering, Pusan National University)
  • 이유기 (부산대학교 전자전기컴퓨터공학과) ;
  • 김희민 (부산대학교 전자전기컴퓨터공학과) ;
  • 박관수 (부산대학교 전자전기컴퓨터공학과)
  • Received : 2014.11.25
  • Accepted : 2014.12.22
  • Published : 2014.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Remote Field Eddy Current Testing (RFECT), one of the ways which is a nondestructive testing using electromagnetic fields, can make up for Magnetic Flux Leakage (MFL) weaknesses and general Eddy Current Testing (ECT) weaknesses which is an occurrence of a huge friction force or disadvantage of detecting defects on the outer wall. So many of institutes and laboratories have studied on RFECT for the past 50 years. But There is a lack of discussion about a study on eddy current and magnetic field distributions in a pipe wall and designing of RFECT exciter coil. In this paper, eddy current and magnetic field distributions in a pipe wall and influence of altering variables are analyzed. Also, the optimal design algorithm about the RFECT Exciter coil are proposed, and influence on defect signals caused by alteration of its shape is analyzed.

전자기를 이용하여 배관의 비파괴검사를 적용하는 방법 중 하나인 Remote Field Eddy Current Testing (RFECT)는 큰 마찰력이 발생하고 잔류자화성분이 남는 Magnetic Flux Leakage (MFL) 방식과 외벽의 결함을 측정하는데 곤란한 일반 Eddy Current Testing (ECT) 방식의 단점들을 보완할 수 있는 기법으로 50여 년 전부터 다양한 기관에서 연구되어왔다. 그러나 배관 내에서 발생하는 와전류와 자기장에 대한 연구와 RFECT Exciter Coil의 설계에 대한 논의가 부족한 실정이다. 본 논문에서는 유한요소법을 이용한 전자기 해석을 통해 배관 내에서 발생하는 와전류와 자기장의 분포를 확인하고 변수 변화에 따른 영향을 분석하였다. 또한 Exciter Coil에 대한 최적 설계 알고리즘을 제시하고, 결함 형상과 기타 변수 변화가 결함신호에 미치는 영향을 확인하였다.

Keywords

References

  1. IEA, World Energy Outlook 2012, 49 (2012).
  2. W. H. Han, "The Development situation and Prospect of Shale Gas", Journal of the Electrical World 429, 46 (2012).
  3. John A. Beavers and Neil G. Thomson, "External Corrosion of Oil and Natural Gas Pipelines", ASM Handbook, 13, 1015 (2006).
  4. Vijay Mathew, "Trends in the Global NDT Equipment market", World Nondestructive Test Equipment Markets, Frost & Sullivan (2009).
  5. M. A. Hussein, ME5713 : Nondestructive Testing, 53 (1996).
  6. IAEA, Non-destructive testing for plant life assessment, IAEA, 1 (2005).
  7. Albert Teitsma and Julie Maupin, "Reduced Mandated Inspection by Remote Field Eddy Current Inspection of Unpiggable Pipeline", Technical Final Report, 12 (2006).

Cited by

  1. Development of RFECT system for in-line inspection robot considering extendibility of receiving sensors based on parallel lock-in amplifier vol.18, pp.2, 2017, https://doi.org/10.1007/s12541-017-0020-9
  2. Method for Removing Secondary Peaks in Remote Field Eddy Current Testing of Pipes vol.36, pp.1, 2017, https://doi.org/10.1007/s10921-016-0379-z