비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제23권3호
  • /
  • Pages.263-269
  • /
  • 2003
  • /
  • 1225-7842(pISSN)
  • /
  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
권호 표지

강자성 배관 외.내부 면의 단일 원형 홈의 깊이와 부피응력이 누설자속에 미치는 영향

Effect of Ear and Near-side Single Circular Pit Depth and Bulk Stress on Magnetic Flux Leakage at ferromagnetic Pipeline

  • 유권상 (한국표준과학연구원 전기자기그룹) ;
  • 박영태 (한국표준과학연구원) ;
  • ;
  • 발행 : 2003.06.30
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초록

누설자속 (magnetic flux leakage: MFL) 신호는 매설된 송유관이나 가스관에 생성된 부식결함의 검사에 이용된다. 배관의 외 내부 면의 단일 원형 홈 (pit) 깊이와 부피응력 (bulk stress)이 축 (x) 방향, 원주 (y) 방향 및 방사상 (z) 방향의 누설자속에 미치는 영향을 3차원 유한요소법을 이용하여 계산하였다. 자기이방성 물질을 이용하여 부피인장응력 (bulk tensile stress)과 수직 응력에 의한 MFL 신호변화를 계산하였다. 배관의 축 및 방사상 방향의 MFL 신호는 배관 외 내부 면의 결함 길이가 깊어질수록, 부피인장응력이 커질수록 MFL 신호는 증가하였다 그러나 원주 방향의 MFL 신호는 결함 깊이와 부피인장응력에 영향을 거의 받지 않았다.

Magnetic flux leakage (MFL) signals were used for corrosion inspection of buried oil and gas pipeline. 3D finite element analysis was used to examine the effects of far and near-side pit depth and tensile stress on MFL signals. Anisotropci materials were used, and the effects of simulated tensile stress on MFL were investigated. The axial and radial MFL signals depended on far and near-side single pit depth and on the bulk stress, but the circumferential MFL signal did not depend on them. The axial and radial MFL signals increased with increasing pit depth and the bulk stress, but the circumferential MFL signal was scarcely changed.

키워드

참고문헌

  1. D. L. Atherton, 'Magnetic inspection is key to ensuring safe pipelines', Oil & Gas J., Vol. 87, No. 32, pp. 52-61 (1989)
  2. D. L. Atherton, C. Jagadish, P. Laursen, V. Storm, F. Ham and B. Scharfenberger, 'Pipeline inspection tool speed alters MFL signals', Oil & Gas J., Vol. 88, No.5, pp. 84-86 (1990)
  3. P. Laursen and D. L. Atherton, 'Effects of line pressure stress on magnetic flux leakage patterns', British J. Nondestructive testing, Vol. 34, No.6, pp. 285-288 (1992)
  4. R. Barnes and D. L. Atherton, 'Effects of bending stresses on magnetic flux leakage patterns', NDT & E International, Vol. 26, No. 1, pp. 3-6 (1993) https://doi.org/10.1016/0963-8695(93)90158-Q
  5. T. W. Krause, R. W. Little, R. Barnes, R. M. Donaldson, B. Ma and D. L. Atherton, 'Effect of stress concentration on magnetic flux leakage signals from Blind-hole defects in stressed pipeline steel', Res. Nondestr. Eval., Vol. 8, pp. 83-100 (1996)
  6. K. Mandal, A. Corey, M. E. Loukas, P. Weyman, J. Eichenberger and D. L. Atherton, 'The effect of defect depth and bending stress on magnetic Barkhausen noise flux-leakage signals', J. Phys. D: Appl. Phys., Vol. 30, pp. 1976-1983 (1997)
  7. L. Clapham, D. L. Atherton, A. Dhar, A. Hsu, C. Mandache, W. Mao and P. Weyman, '3D details of defect-induced MFL and stress in pipelines', Ann. Rep. For Gas Res. Inst., contract # 5093-2605, p. 25 (2000)
  8. W. Mao, C. Mandache, L. Clapham and D. L. Atherton, 'The effect of bulk stresses on magnetic flux leakage signals', Insight, Vol. 43, No. 10, pp. 688-691, (2001)
  9. W. Mao and D. L. Atherton, 'Effect of tensile stress on the 3D reversible and irreversible differential magnetic susceptibilities', J. Appl. Phys., Vol. 89, No. 11, pp. 7251-7253, (2001) https://doi.org/10.1063/1.1355341
  10. Infolytica Corp., P.O.Box 1144, 300 Leo Pariseau, Suite 2222, Montreal, Quebec, H2W 2P4, Canada; web site: http://www.infolytica.com
  11. K. Mandal, D. Dufour, T. W. Krause and D. L. Atherton, 'Investigation of magnetic flux leakage and magnetic Barkhausen noise signals from pipeline steel', J. Phys. D: Appl. Phys., Vol. 30, pp. 962-973, (1997)
  12. B. D. Cullity, Introduction to Magnetic Materials, Addison-Weslly, Massachusetts (1972), pp. 271-271