Re-examination of the hydrodynamic forces acting on partially buried submarine pipelines

H. An, Chengcai Luo, Liang Cheng, David White

    Research output: Chapter in Book/Conference paperConference paper

    3 Citations (Scopus)

    Abstract

    The hydrodynamic forces exerted on a pipeline partially buried in a permeable seabed subjected to combined random oscillatory flow are investigated experimentally. The tests were carried out in a re-circulating flume that can generate steady currents, oscillatory flow and combined flow, known as the O-tube. The performance of the testing facility was validated against published experimental data under regular oscillatory flow conditions. Four tests with different embedment depths, under random oscillatory flow conditions were then carried out. The flow velocity, hydrodynamic pressure around the model pipe and pore pressure in the soil were monitored. The hydrodynamic forces were calculated through pressure integration around the model pipe. The hydrodynamic force reduction due to embedment was compared with the model given in the most widely-used pipeline stability design guideline, DNV-RPF109. A horizontal load reduction of 55% was found for the fully buried pipe, which was lower than the 70% reduction suggested by DNV-RP-F109. The variation of the vertical hydrodynamic load with embedment ratio (embedment depth to pipe diameter) was also found to be different from the model suggested by DNV-RP-F109. It was found the fully buried pipe experienced a large vertical force, even higher than that of the fully exposed pipe, under low KC number conditions.

    Original languageEnglish
    Title of host publicationProceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering OMAE2012
    Place of PublicationUSA
    PublisherASME
    Pages199-206
    Number of pages8
    Volume3
    ISBN (Electronic)9780791844908
    DOIs
    Publication statusPublished - 2012
    EventASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering - Rio de Janeiro, Brazil
    Duration: 1 Jul 20126 Jul 2012

    Conference

    ConferenceASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
    CountryBrazil
    CityRio de Janeiro
    Period1/07/126/07/12

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