| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein only an AE inspection method exists for inspecting corrosion on an outer surface of a bottom plate of a petroleum tank under use, in a prior art, and wherein a long time and a great inspection expense are required when an ultrasonic inspection method is applied in routine inspection. SOLUTION: This method of the present invention uses a potentiometric method of making a fixed current in a constitutive member such as the bottom plate and a side plate having damages such as the corrosion, and of measuring a potential difference between two points with the damage therebetween. Detection sensitivity for the damage is enhanced by selecting attaching positions of two electrode terminals and a measuring terminal in a position to be as near to a generation position of the damage as possible and to sandwich the damage. A technique of conducting reverse analysis by a complex potential method is developed using a result with a measured potential difference distribution of an outer circumference of the bottom plate of the tank, and a program therefor is prepared. Convergency is verified by the program when the corrosion exists only in one portion, and the program is confirmed to be useful for a practical use, as a result thereof. COPYRIGHT: (C)2006,JPO&NCIPI
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