Piping systems are often inspected ultrasonically to ensure safety. This can be accomplished by a series of point to point tests from the outside surface of the pipe. If coating covers the pipe, as is often the case, access to the outside surface requires removal of the coating to perform the test, and then re-installation when testing is complete. Removal and reinstallation of coating is not only time consuming but in most cases it is prohibitively expensive too. Ultrasonic guided waves provide an attractive alternative solution to the basic bulk wave ultrasonic test. Using Guided Waves, a probe can be applied to the pipe at a single location and several meters of the pipe can be inspected. The coating is only removed where the probe is applied. This paper describes the visco-elastic properties of two different coating materials: Bitumen tape and wax tape is considered, a FEM simulation of the propagation of axisymmetric guided waves through bare and coated pipes having different coating thicknesses. The ABAQUS FEM code is used and validation of FEM simulation results through experiments in bare and coated pipes using guided wave inspection system is reported.
Ultrasonic guided wave phased array inspection of pipelines
Gruppenstrahler für geführte Ultraschallwellen zur Pipelineprüfung
2009
4 Seiten, 7 Bilder, 3 Tabellen, 8 Quellen
Conference paper
English
Guided wave ultrasonic inspection and verification studies of burried pipelines
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