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概要

This study discusses what we can do for the corrosion monitoring of storage tanks by acoustic emission (AE) technique. AEs from rust fractures were monitored by AE sensors mounted on terrace of annular plate (annular sensor) and side wall (side wall sensor) using two AE systems developed by us (ADAS) and commercially available. Percentages of AE signal counts classified by eye-inspection were less than 10 % of the total events monitored by the ADAS and less than 0.92 % by the commercial AE system. These AE activities suggested an extremely low corrosion risk parameter, however the signals counts classified by the fractal analysis according to the recommended practice by HPIS G110TR suggested an extremely high risk parameter, suggesting difficulty only from AE activities. Source locations estimated from the Lamb wave AE signals detected by sensors on the annular plates agreed fairly well with the wall reduction portion measured by the point-to-point ultrasonic thickness measurement.

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