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Proceedings Paper

Validation of a pulsed eddy current system for measuring wall thinning through insulation
Author(s): Colin R. Brett; Jan A. de Raad
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Paper Abstract

There have been several failures in power plant feedwater piping systems due to wall thinning caused by flow- accelerated corrosion of the inner surface. Detection of wastage in susceptible pipes is costly as traditional NDE methods such as ultrasonic testing entail removal and reinstallation of insulation over many meters of pipework. Radiography is one solution to this problem, but it is slow to apply and requires careful attention to safety. The RTD Incotest system uses pulsed eddy current technology to measure pipewall thickness through insulation and external cladding. The technology has been licensed from Arco, Inc., who originally developed the technique for large diameter pipelines and storage tanks where the area interrogated was made deliberately large. This paper describes an optimized Incotest systems which can detect and measure internal or external wall wastage which is more localized and typical of flow-accelerated corrosion. Improvements have also been made to the inspection and data acquisition in order to increase the inspection rate and overall productivity. Ultimately the performance of the optimized Incotest system has been verified on samples which contain artificial and real corrosion.

Paper Details

Date Published: 14 November 1996
PDF: 12 pages
Proc. SPIE 2947, Nondestructive Evaluation of Utilities and Pipelines, (14 November 1996); doi: 10.1117/12.259169
Show Author Affiliations
Colin R. Brett, Electric Power Research Institute (United States)
Jan A. de Raad, Roentgen Technische Dienst SV (Netherlands)

Published in SPIE Proceedings Vol. 2947:
Nondestructive Evaluation of Utilities and Pipelines
Martin Prager; Richard M. Tilley, Editor(s)

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