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Experimental results of guided wave travel time tomography

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Author: Volker, A.W.F. · Vos, H.
Type:article
Date:2011
Publisher: AIP
Source:38th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2011, 17-22 July 2011, Burlington, VT, USA, 31, 1430, 1968-1975
series:
AIP Conference Proceedings
Identifier: 462176
ISBN: 9780735410138
Keywords: Electronics · Corrosion Monitoring · Dispersion · Guided Wave · Inversion · Parameterization · Tomography · Travel Time · Ultrasonic · Industrial Innovation · Fluid Mechanics Chemistry & Energetics · PID - Process & Instrumentation Development · TS - Technical Sciences

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. The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation matches very well with the objective to reduce cost while maintaining a high safety level. Guided waves are very attractive for permanent monitoring systems because it provides a wall thickness map in between two sensor rings. The wall thickness map provides quantitative information about the remaining wall thickness, location and extent of the corrosion. The performance of guided wave tomography has been evaluated experimentally assessing the sizing accuracy and the smallest corrosion spots that can be detected with this technology. The results show accurate sizing, with a sizing accuracy better than 10% of the nominal wall thickness. Additionally, the maximum distance between the transmitter and receiver rings and the presence of different coatings has been evaluated. The results demonstrate the robustness of the technology under a range of practical conditions.