Under funding from the US Department of Transportation's Office of Pipeline Safety, Southwest Research Institute, San Antonio, has developed new nondestructive evaluation technology to detect and characterize dent and gouge type defects. This article describes the NLH (nonlinear harmonic) technique and its response to a series of mechanical-damage defects subsequently pressure tested to failure. These data, along with an engineering assessment of failed defects, fractographic investigations, and stress and strain distributions on the pipe surface near the defect derived from finite-element stress analysis, are used to identify NLH-based defect severity criteria that could be used to help rank the relative severities of damage in pipelines.


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    Title :

    New NDE technology detects, characterizes dent, gauge defects


    Additional title:

    Mit einer neuen zerstörungsfreien Prüfung können Defekte an Pipelines identifiziert werden


    Contributors:
    Crouch, A.E. (author) / Chell, G.G. (author)

    Published in:

    Oil and Gas Journal ; 101 , 30 ; 52-58


    Publication date :

    2003


    Size :

    7 Seiten, 9 Bilder, 2 Tabellen, 2 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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