다전극 탐상을 통한 토중 매설배관 피복결함 탐상 정확도의 개선 = Enhancing the Reliability of Coating Flaw Detection for Pipes Buried in Soil Using a Multi-Electrode Detector

다국어 초록 (Multilingual Abstract)

External corrosion of buried pipes can be controlled using both coating and cathodic protection. However,deterioration of the coating can occur due to several reasons. The detection reliabilty of coating flaw detectionmethods is affected by interference such as metal objects connected to rectifiers and copper grids. Whenperforming parallel direct current voltage gradient (DCVG) inspection, a sine wave form without potentialreversal in voltage gradient appears in the area where the interference exists. However, this area may benot identified using existing methods. The objective of this study was to determine the effect of analyzingdirection on the reliability of coating flaw detection of pipes buried in soil using a multi-electrode detector.
DCVG on the buried pipe was measured along the buried pipe. This measurement parallel to the pipe wasrepeated. Measured data were analyzed for parallel, vertical, and diagonal directions. The reliability of coatingflaw detection was improved by up to 46.4% compared to the conventional method.

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