DEFECT DETECTION METHOD FOR BURIED PIPE IN GAS STATION, DEFECT DETECTOR, AUXILIARY TOOL THEREFOR, AND DEFECT DETECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a defect detection method and a defect detector for a buried pipe in a gas station capable of precisely easily specifying a defective point at a low cost with a saved space while having a detection precision capable of detecting a defect corresponding to an opening 0.3 mm or less in diameter in the buried pipe, and performing a leak inspection with an easy method and device, an auxiliary tool therefor, and a defect detection system.;SOLUTION: This method for detecting the defective point in the buried pipe buried in the ground within the site of the gas station comprises successively and continuously measuring the ground surface potential difference at predetermined intervals by a pair of electrodes while intermittently carrying a current to the buried pipe. The potential difference of a collation electrode to a reference electrode and its sign are measured while taking one of the pair of electrodes as the reference electrode and the other as the collation electrode, and the vicinity of a measurement point where the sign of the potential difference is inverted is detected as the defective point of the buried pipe.;COPYRIGHT: (C)2005,JPO&NCIPI