The peak amplitude of the fundamental torsional mode, T(0,1), ultrasonic guided wave, excited and sensed by commercially available equipment using permanently mounted magnetostrictive transducers, was used to monitor the growth of electrochemically induced, external discontinuities in a steel pipeline (216 mm outside diameter). The pipeline was more than 30.5 m long, had multiple welds and two 90° elbows. Over the course of eight months, two discontinuities, hidden from ultrasonic testing (UT) technicians, grew systematically in both area and depth, providing the opportunity to experimentally evaluate the effects of complex geometry on signal characteristics. Corrosion around a weld was also studied. The obtained results were compared with a surface discontinuity that was unaffected by intermediate welds located between the transducer and the discontinuity. It was found that the effects of multiple welds and an elbow decreased the sensitivity for discontinuity growth monitoring by a factor of less than two. This was established by examining the scaling of discontinuity signal peak heights against a weld peak instead of using a conventional distance-amplitude-correction (DAC) curve to account for material attenuation, by comparing the signals from a discontinuity viewed along the forward and the reverse direction, and by allowing the discontinuities to change in all three dimensions in the course of this monitoring effort. This controlled study for discontinuity growth monitoring can be useful to guide efforts on discontinuity growth monitoring of complex pipelines in the field.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Monitoring the growth of hidden corrosion discontinuities in a pipeline with complex geometry using torsional mode ultrasonic guided wave


    Weitere Titelangaben:

    Überwachung des Wachstums versteckter Korrosionsschäden an einer Pipeline komplexer Geometrie mittels geführter Ultraschall-Torsionswelle


    Beteiligte:
    Liu, John M. (Autor:in) / Davis, Carrie E. (Autor:in) / Regin, Terri M. (Autor:in) / Brophy, Joseph (Autor:in)

    Erschienen in:

    ME - Materials Evaluation ; 69 , 3 ; 393-400


    Erscheinungsdatum :

    2011


    Format / Umfang :

    8 Seiten, 8 Bilder, 1 Tabelle, 15 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Imaging hidden corrosion using ultrasonic non-dispersive higher order guided wave modes

    Balasubramaniam, Krishnan / Chandrasekaran, J. / Maxfield, B.W. et al. | Tema Archiv | 2008


    An ultrasonic guided wave tomography approach for pipeline health monitoring

    Royer, R.L. jun. / Velsor, J. van / Rose, J.L. | Tema Archiv | 2009


    Permanently installed guided wave pipeline monitoring

    Galvagni, A. / Cawley, P. | Tema Archiv | 2012


    Ultrasonic guided wave focusing beyond welds in a pipeline

    Zhang, L. / Luo, W. / Rose, J.L. | Tema Archiv | 2006


    Corrosion monitoring of airframe structures using ultrasonic arrays and guided waves

    Sicard, R. / Chahbaz, A. / Goyette, J. | Tema Archiv | 2003