Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Rectifier and Copper Grid Interference on the Detection Reliability of Coating Flaws on Buried Pipes

매설 배관 피복 결함 탐상 정확도에 미치는 인접 정류기 및 접지 구리망 간섭의 영향

  • Kim, M.G. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University) ;
  • Lim, B.T. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University) ;
  • Kim, K.T. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University) ;
  • Chang, H.Y. (Power Engineering Research Institute, KEPCO E&C) ;
  • Park, H.B. (Power Engineering Research Institute, KEPCO E&C) ;
  • Kim, Y.S. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University)
  • 김민기 (안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 임부택 (안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 김기태 (안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 장현영 (한국전력기술주식회사) ;
  • 박흥배 (한국전력기술주식회사) ;
  • 김영식 (안동대학교 신소재공학부 청정에너지소재기술연구센터)
  • Received : 2020.08.16
  • Accepted : 2020.08.24
  • Published : 2020.08.31
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Abstract

The external corrosion of buried piping can be controlled using both coating and cathodic protection. Several factors are involved in the damage and deterioration of the coating on pipes. There are many detection methods for coating defects on pipes and the direct current voltage gradient (DCVG) method is one of the most powerful methods. However, the detection reliability of DCVG can be affected by interferences such as stray current, metal objects connected to rectifiers, and copper grids. Therefore, this study focused on the interference effects of rectifiers and a copper grid on the reliability of coating flaw detection. As the length of the interference pipe connected to the rectifier increased, the reliability decreased. In contrast, as the distance between the pipe and the copper grid increased, the reliability of the coating flaw detection increased. The detection results produced by the DCVG method were discussed using current and potential simulations for a pipe with a rectifier and copper grid interference in the soil.

Keywords

References

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