METHOD FOR ESTIMATING CORROSION OF UNDERGROUND TANK, METHOD FOR PREVENTING CORROSION OF UNDERGROUND TANK, DEVICE FOR ESTIMATING CORROSION OF UNDERGROUND TANK, AND DEVICE FOR PREVENTING CORROSION OF UNDERGROUND TANK

摘要

PROBLEM TO BE SOLVED: To estimate whether corrosion is present or not in an underground tank in a stage prior to the generation of leakage in the underground tank. SOLUTION: The underground tank corrosion estimation device 10 comprises: a suction pipe 16 inserted into an underground tank 14; a suction pump 18 sucking retained water W retained in the bottom part of the underground tank 14 via the suction pipe 16; an analyzer 20 analyzing a chlorine ion concentration and a sulfide concentration in the retained water W pumped-up by the suction pump 18; a controller 22 for estimating whether corrosion is present or not at the inside of the underground tank 14 based on the analyzed result by the analyzer 20; and a display 24 displaying the estimated result. The estimation whether corrosion is present or not at the inside of the underground tank 14 is made possible in a stage prior to the generation of leakage in the underground tank 14 by the underground tank corrosion estimation device 10. The underground tank corrosion prevention device 40 feeds pure water to the underground tank 14, and dilutes the retained water W. Thus, the chlorine ion concentration in the retained water is reduced so as to prevent the generation of pitting corrosion. COPYRIGHT: (C)2005,JPO&NCIPI