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The Application of Guided Waves for the Detection of Corrosion under Insulation

Since its development and commercial availability, guided wave applications have been rapidly gaining acceptance as a cost-effective means of screening pipelines to validate their operational integrity (Alleyne and Cawley, 1996). At the same time, the applications on which the technique can be used have also expanded to envelop a wide range of lines that traditionally would have required testing efforts that were both labor intensive and prohibitively costly. Among these is the screening of extended lengths of insulated aboveground and road crossing line. Both of these applications would have traditionally involved costly efforts that would cause disruptions to the operation of the pipeline itself or to critical infrastructure surrounding the line. This paper outlines some recent advances in the guided wave technique and correlates these to the application of corrosion under insulation detection on an extensive length of piping.

References
Alleyne, D.N. and P. Cawley, “The Excitation of Lamb Waves in Pipes Using Dry-Coupled Piezoelectric Transducers,” Journal of Nondestructive Evaluation, Vol. 15, 1996, pp. 11–20. Lowe, M.J.S. and P. Cawley, “Long Range Guided Wave Inspection Usage – Current Commercial Capabilities and Research Directions,” Internal Report, London, Imperial College, 29 March 2006. Rose, J.L., M. Jing and J.K. Van Velsor, “New Directions in Guided Wave Pipe Testing,” Materials Evaluation, Vol. 65, 2007, pp. 375–378. Sabet-Sharghi, R. and B. Shannon, “Recent Advances in the Application and Capabilities of the Guided Wave Pipe Screening Technique,” Proceedings from the Fourth Middle East Nondestructive Testing Conference, Bahrain, 2007. DOT, “Guided Wave UT Target Items for Go-No Go Procedures,” Washington, DC, United States Department of Transportation, primis.phmsa.dot.gov/gasimp/docs/GuidedWaveCheckList110107.pdf.
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