3209 Risk Estimation for Corrosion in Bottom Floor in Oil Storage Tanks and it's Application to AE Global Diagnosis

Abstract

This paper discusses the relation of the AE parameters examined during in-operation to the current local corrosion state (statistical corrosion rate) on bottom plate of real oil storage tanks estimated from thickness measurement data. The measured AE signals have been compared with the parameters determined by the "risk curve for corrosion" derived from ultrasonic plate thickness measurement data as the current progress rate of corrosion in the much more corroded area. The result has shown the applicability of the AE method for the in-operation evaluation of corrosion state in real oil storage tanks.