Severe environmental loads on exposed pipelines can lead to excessive horizontal displacements or free spanning with subsequent flow induced vibrations. The interaction between a submarine pipeline and an erodible sea bed has important implications for design choices relevant to concrete coating thickness (and consequently for the required laying equipment) and/or pipeline burial depth. For pipelines resting on or buried in erodible seabeds affected by severe environmental conditions, design should be founded on a careful analysis of the following aspects: The soil erodibility, the bedform activity and relevant time scales. The maximum curvature which the pipeline crossing active sand waves and sand dunes can achieve. The initial pipeline-sea bed configuration and that expected during the pipeline life time. The maximum length of potential exposure and/or suspension expected to develop with respect to permissible lengths from a structural integrity view point. The soil liquefaction potential and its effects on the pipeline or adjacent slopes. The present paper summarizes the possible scenarios for pipelines laid on erodible sea beds, the techniques used to evaluate the onset and extent of erosion and other forms of pipeline-sea bed interaction and the design criteria applicable for the different configurations which can occur. A probabilistic approach to assess the structural integrity of scour induced free spans is introduced.


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    Title :

    Pipeline reliability across erodible/active seabeds


    Contributors:
    Bruschi, R. (author) / Drago, M. (author) / Venturi, M. (author) / Jiao, G. (author) / Sotberg, T. (author)


    Publication date :

    1997


    Size :

    Seiten, 42 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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