抄録
We have developed inspection method to diagnose tank bottom plate by ultrasonic testing (UT) without tank opening. This paper describes a part of our result of study which is the screening method to identify corrosion area by long range UT. The applicability to diagnose tank bottom plate without tank opening by long range UT was revealed in some examinations. Jig of ultrasonic probe was developed in order to keep constant distance between ultrasonic probe and side plate of tank. It was demonstrated that the method is appropriate to detect wave reflected form corrosion area by conducting an experiment using specimen which is cut from actual bottom plate. We consider that the proposed method can be applied to the screening by creation of further database.
