Acoustic emission for detection of corrosion under insulation

Details Acoustic emission for detection of corrosion under insulation Acoustic emission for detection of corrosion under insulation

1995-03-24

1996-06-18

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73 1DV, G01N 2920

Patent

active

055266894

ABSTRACT:
A method and apparatus for detecting the presence of surface corrosion under insulation on a piping structure employs artificially generated, broadband acoustic sound waves to interrogate the piping structure. The sound waves are coupled into the piping structure and detected after they have propagated through and interacted with a portion of the piping structure. The amplitude of RMS voltage signals indicative of the detected sound waves is used to determine whether or not surface corrosion is present. Highly corroded pipes have been shown to yield relatively low RMS voltage signals whereas the lack of corrosion yields relatively high RMS voltage signals.

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