A proposed ultrasonic inspection technique for offshore structures

The need for nondestructive evaluation procedures for tubular joints in offshore structures is emphasized by every platform collapse. A new microprocessor-based ultrasonic inspection technique for tubular joints has been devised and preliminary tests conducted. The inspection concepts and the sensitivity of the technique to damage has been evaluated utilizing a 1/3 scale structural K-joint. The inspection concepts are discussed; in addition, the results of the 1/3 scale K-joint fatigue test are presented. Additional laboratory experiments were conducted to determine the effects of a marine environment and other limiting conditions on the sensitivity and feasibility of the technique. These results are also discussed.