抄録
A recommended practice for acoustic emission (AE) evaluation of corrosion damages in underground tanks was issued by the High Pressure Institute of Japan (HPIJ) on March 30, 2012, financially supported by the NTT Group. The practice describes test procedure, database, and evaluation criteria. 112 tanks were tested on the basis of the developed test procedure. After the AE tests, 17 tanks were opened and visual inspection and thickness measurements were performed. No corrosion damage was found in the tanks with very low AE hits (less than 100 hits) , while very high AE hits (more than 500 hits) were detected in the tanks where significant corrosion damages (thickness losses) were observed. The detected hit distribution with regard to number of corresponding tanks also suggested a correlation between the AE hits and corrosion damages in underground tanks. This paper reports the test procedure, database and evaluation criteria described in the practice.
