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Proceedings Paper

Guided UT wave inspection of insulated feedwater piping using magnetostrictive sensors
Author(s): J. W. Brophy; Colin R. Brett
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Paper Abstract

Due to failures in power plant feedwater piping, inspection of these components has become a priority item. The major reason for the failures is wall loss due to flow-accelerated corrosion on the inside diameter (ID) of the pipes. It can be very costly to use standard nondestructive testing (NDT) techniques for a comprehensive inspection due to the need to remove large areas of insulation. Guided UT waves can travel through the pipe over long distances and detect cross- sectional changes in the pipe wall with minimal insulation removal. This makes the guided UT wave an excellent candidate for locating significant wall loss due to corrosion and pitting. Southwest Research Institute (SwRI) has developed a simple and robust technology for generating and receiving guided UT waves based on magnetorestrictive sensors. Signals are generated and detected in the pipe via multi-turn coils acting as transmitters and receivers. Insulation removal is only required where the coils are attached to the pipe and this allows many meters of pipe to be inspected from a single location. Guided UT waves detect cross-sectional changes from corrosion on both the ID and outside diameter of the pipe and can also be used to map weld locations. This paper describes SwRIs systems and the preliminary results from testing on a feedwater pipe mockup containing simulated flow-accelerated corrosion.

Paper Details

Date Published: 14 November 1996
PDF: 6 pages
Proc. SPIE 2947, Nondestructive Evaluation of Utilities and Pipelines, (14 November 1996); doi: 10.1117/12.259168
Show Author Affiliations
J. W. Brophy, Southwest Research Institute (United States)
Colin R. Brett, Electric Power Research Institute (United States)

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

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