매설 배관 피복 결함 탐상 정확도에 미치는 인접 정류기 및 접지 구리망 간섭의 영향
Effects of Rectifier and Copper Grid Interference on the Detection Reliability of Coating Flaws on Buried Pipes
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초록
The external corrosion of buried piping can be controlled using both coating and cathodic protection. Severalfactors are involved in the damage and deterioration of the coating on pipes. There are many detectionmethods for coating defects on pipes and the direct current voltage gradient (DCVG) method is one ofthe most powerful methods. However, the detection reliability of DCVG can be affected by interferencessuch as stray current, metal objects connected to rectifiers, and copper grids. Therefore, this study focusedon the interference effects of rectifiers and a copper grid on the reliability of coating flaw detection. Asthe 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 detectionincreased. The detection results produced by the DCVG method were discussed using current and potentialsimulations for a pipe with a rectifier and copper grid interference in the soil.
Abstract
The external corrosion of buried piping can be controlled using both coating and cathodic protection. Severalfactors are involved in the damage and deterioration of the coating on pipes. There are many detectionmethods for coating defects on pipes and the direct current voltage gradient (DCVG) method is one ofthe most powerful methods. However, the detection reliability of DCVG can be affected by interferencessuch as stray current, metal objects connected to rectifiers, and copper grids. Therefore, this study focusedon the interference effects of rectifiers and a copper grid on the reliability of coating flaw detection. Asthe 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 detectionincreased. The detection results produced by the DCVG method were discussed using current and potentialsimulations for a pipe with a rectifier and copper grid interference in the soil.
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