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According to the Major Accident Reporting System (MARS), the accident database assembled by the Major Accident Hazards Bureau, a crack occurred in the bottom plate of an above-ground oil tank in Italy in May 2006 resulting in a leakage of approximately 22,000 tons of crude oil. The tank was built 40 years ago, and the bottom plate was replaced 20 years after construction of the tank. At each opening of the tank, inspectors carried out internal inspections and planned programs for reconstruction or repair. The details of the leakage are not clear, and whether the crack was caused by corrosion of the tank bottom plate or by inappropriate inspection remains under investigation. The incident report1) recommends that preventative inspection of all tanks using AE and investigation of the structural state of the tanks should be performed. Self-maintenance engineering has been implemented in Europe and the United States, where AE is generally used for evaluating corrosion damage of the tank bottom plate in service. The French petroleum institution established guidelines for the inspection and maintenance of cylindrical storage tanks in September 2000. The appendix2) in the guidelines for illustrates the recommended practice for the application of AE to evaluating the extent of leakage and corrosion. Currently, European and US plants apply the results of AE measurement to the maintenance plan for tanks to be inspected. In fiscal year 2010, the Japan Petroleum Energy Center (JPEC) conducted research3) on the turnaround of the tank bottom plate in Europe and the United States. The research indicates that the selfturnaround of such tanks is normally about 20 to 30 years, which is longer than the period of about 10 years between internal inspections in Japan, according to JPEC’s research data collected from 83 tanks in domestic refineries. Therefore, the introduction of risk as298 Journal of the Japan Petroleum Institute, 56, (5), 298-303 (2013)

Development of Improved AE Evaluation Technique for Corrosion Damage in Bottom Plates of Above-ground Oil Tanks in Service