DIRECT CURRENT METHOD FOR DAMAGE DETECTION OF UNDERGROUND METAL PIPELINE WITH ANTICORROSION COAT

Surveying damage site of the anticorrosion coat of the underground metal pipeline is currently a realistic problem in pipe network construction. The methods commonly used for detection of the damages include the Person method, potential test method and close interval pipe-to-soil potential survey method, but the principle of the DC method is rarely mentioned. This article makes a detailed introduction to the forward modeling and inversion method for finding out specific damage sites of the anticorrosion coat of underground metal pipelines by the DC method. Calculation and analysis suggest that the DC method is effective in detecting the damage sites on the anticorrosion coat of underground metal pipelines.