S172015 Corrosion Damage Parameter for the bottom floors of the oil storage tank by using the initial thickness distribution

Abstract

In recent years, the number of the accidents of the dangerous facility is increasing. One of the reasons of the accidents is the corrosion by aged deterioration. For the oil storage tanks, the initial thickness is important to accurately estimate the metal loss. Since the thickness is usually not measured before using the tanks, the designed thickness is used as an initial thickness. However, the actual initial thickness distribution is unknown because of the allowable error. Therefore, in the present study, the initial thickness distribution of bottom floors is estimated due to the method using the average value and standard deviation of the thickness measurement data of shut down inspection. Furthermore, from the results, the corrosion damage parameter was proposed by using the relationship between the cumulative probability and the depth of corrosion.