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Ultrasonic Multi-Skip Inspection at Clamped Saddle Supports

The ultrasonic Multi-Skip inspection technique has made a modest entry in the world of advanced ultrasonic inspection methods. As an intermediate-range inspection technique, it has proven particularly useful for the inspection of pipes at clamped saddle support locations. In order to shed some light on its capabilities and limitations, this paper is presenting some results of Multi-Skip inspections done on 36” and 48” diameter pipe of 34 mm as well as 9.5 mm wall thickness. The sensitivity and the accuracy of the technique are demonstrated using field measurement results and the feasible application range is discussed. With its high sensitivity to local wall loss, the Multi-Skip inspection technique appears to be a welcome addition to the currently available Guided-Wave and CHIME inspection methods for inaccessible locations.