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.
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ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
July 1–6, 2012
Rio de Janeiro, Brazil
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4490-8
PROCEEDINGS PAPER
A Re-Examination of the Hydrodynamic Forces Acting on Partially-Buried Submarine Pipelines
Hongwei An,
Hongwei An
University of Western Australia, Perth, WA, Australia
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Chengcai Luo,
Chengcai Luo
University of Western Australia, Perth, WA, Australia
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Liang Cheng,
Liang Cheng
University of Western Australia, Perth, WA, Australia
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David White
David White
University of Western Australia, Perth, WA, Australia
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Hongwei An
University of Western Australia, Perth, WA, Australia
Chengcai Luo
University of Western Australia, Perth, WA, Australia
Liang Cheng
University of Western Australia, Perth, WA, Australia
David White
University of Western Australia, Perth, WA, Australia
Paper No:
OMAE2012-83269, pp. 199-206; 8 pages
Published Online:
August 23, 2013
Citation
An, H, Luo, C, Cheng, L, & White, D. "A Re-Examination of the Hydrodynamic Forces Acting on Partially-Buried Submarine Pipelines." Proceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. Volume 3: Pipeline and Riser Technology. Rio de Janeiro, Brazil. July 1–6, 2012. pp. 199-206. ASME. https://doi.org/10.1115/OMAE2012-83269
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