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

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

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.

199-206
American Society Of Mechanical Engineers (ASME)
An, Hongwei
53542f2c-e294-4e26-a581-344e646c72e6
Cheng, Liang
0ce99dcc-f682-4ec6-97aa-59fd87174385
Luo, Chengcai
3f76a01f-41ea-43b3-8be7-6e6289179aa8
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
An, Hongwei
53542f2c-e294-4e26-a581-344e646c72e6
Cheng, Liang
0ce99dcc-f682-4ec6-97aa-59fd87174385
Luo, Chengcai
3f76a01f-41ea-43b3-8be7-6e6289179aa8
White, David
a986033d-d26d-4419-a3f3-20dc54efce93

An, Hongwei, Cheng, Liang, Luo, Chengcai and White, David (2012) A re-examination of the hydrodynamic forces acting on partially-buried submarine pipelines. In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012. vol. 3, American Society Of Mechanical Engineers (ASME). pp. 199-206 . (doi:10.1115/OMAE2012-83269).

Record type: Conference or Workshop Item (Paper)

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.

Full text not available from this repository.

More information

Published date: 2012
Venue - Dates: ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012, Rio de Janeiro, Brazil, 2012-07-01 - 2012-07-06

Identifiers

Local EPrints ID: 419910
URI: https://eprints.soton.ac.uk/id/eprint/419910
PURE UUID: 7ff4f7c6-fdab-43b9-858b-381a8db40bd2
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 14 Mar 2019 01:24

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