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DOE OSTI · 22263779

1-D profiling using highly dispersive guided waves

Volker, Arno·Zon, Tim van
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Abstract

Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the actual defect location is not accessible, e.g., a pipe support or a partially buried pipe. Guided wave tomography has been developed to reconstruct the wall thickness of steel pipes. In case of bottom of the line corrosion, i.e., a single corrosion pit, a simpler approach may be followed. Data is collected in a pitch-catch configuration at the 12 o'clock position using highly dispersive guided waves. After dispersion correction the data collapses to a short pulse, any residual dispersion indicates wall loss. The phase spectrum is used to invert for the wall thickness profile in the circumferential direction, assuming a Gaussian defect profile. The approach is evaluated on numerically simulated and on measured data. The method is intended for rapid, semi-quantitative screening of pipes.

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71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICSCONFIGURATIONCORROSIONDISPERSIONSPIPESPULSESSAFETYSIMULATIONSPECTRASPECTROSCOPYSTEELSTOMOGRAPHY

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Volker, Arno, Zon, Tim van. 2014-02-18. 1-D profiling using highly dispersive guided waves. https://doi.org/10.1063/1.4864819

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