4.7 Article

Acoustic emission monitoring of corrosion in steel pipes using Lamb-type helical waves

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Publisher

SAGE PUBLICATIONS LTD
DOI: 10.1177/14759217221105644

Keywords

acoustic emission; pipes; corrosion; helical guided waves

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This paper proposes a new method for monitoring corrosion in steel pipelines using the acoustic emission technique. It takes into account the helical propagation of corrosion-related AE events and suggests a qualitative corrosion monitoring approach. Experimental results demonstrate the potential of helical Lamb-type AE for corrosion monitoring.
This paper is concerned with the monitoring of corrosion in steel pipelines using the acoustic emission (AE) technique. Large uniform corrosion in pipes causes significant wall-thickness loss, and the intensity of the AE activity is correlated with the severity of the corrosion. A new approach for considering the helical propagation of corrosion-related AE events is proposed. Specifically, it is suggested that a longer portion of conventional AE hit is considered to account for multiple arrivals of Lamb-type modes traveling helically in the circumference of the pipe known as helical guided waves (HGW). Using the recorded amplitude of these events, a qualitative corrosion monitoring approach is proposed using the b-value analysis. An accelerated corrosion test on a steel pipe instrumented with a network of AE sensors is carried out to validate the proposed approach. Moreover, a numerical study is performed to evaluate the energy variation of HGW during the corrosion process. Both experimental and numerical results suggest that helical Lamb-type AE has the potential to be utilized for corrosion monitoring.

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