Two full-scale ductile fracture propagation experiments on segments of line pipe pressurized with nitrogen gas have been conducted underwater at a depth of 40 feet (12 m) to evaluate the ductile fracture phenomenon in underwater pipelines. The pipes were 22-inch (599-mm) diameter and 42-inch (1067-mm) diameter. Fracture velocities were measured and arrest conditions were observed. The overpressure in the water surrounding the pipe resulting from the release of the compressed nitrogen gas contained in the pipe was measured in both experiments. The overpressure in the water reduces the stress in the pipe wall and thus slows down the fracture. In addition, the water surrounding the pipe appears to be more effective than soil backfill in producing a slower fracture velocity. Both of these effects suggest a greater tendency toward arrest for a pipeline underwater than would be the case for the same pipeline buried in soil onshore. Further verification of this effect is planned and a modified version of the existing model for predicting ductile fracture in buried pipelines will be developed for underwater pipelines.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Fracture propagation in underwater gas pipelines


    Weitere Titelangaben:

    Rissausbreitung in Unterwasser-Gasleitungen


    Beteiligte:
    Mavey, W.A. (Autor:in)


    Erscheinungsdatum :

    1984


    Format / Umfang :

    8 Seiten, 15 Bilder, 6 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Fracture propagation in CO2 pipelines

    Cosham, A. / Eiber, R.J. | British Library Online Contents | 2008


    Buckle propagation and fracture in pipelines

    Hoo Fatt, M.S. | Tema Archiv | 1999



    Fracture propagation control in very high strength gas pipelines

    Buzzichelli, G. / Scopesi, L. | Tema Archiv | 2000


    A dynamic boundary ductile-fracture-propagation model for CO~2 pipelines

    Mahgrefteh, H. / Brown, S. / Zhang, P. | British Library Online Contents | 2010