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Pipeline stability revisited

Pipeline stability revisited
Pipeline stability revisited

The stability assessment of the 40 in. North Rankin A trunkline, operated by Woodside Energy Ltd., has provided better insight into fluid-soil-pipe interactions during extreme storm events. The resulting conclusion of the work is that the trunkline, a major subsea natural gas artery in Australia's Northwest Shelf since its installation in 1982, can continue to be operated safely for the next 30 years from a hydrodynamic stability point of view. This conclusion was reached after substantial study and physical model testing was performed considering the tripartite interaction between fluid, seabed, and pipeline. To provide vital information feeding into the stability analysis, a physical model testing programme was developed, and a new world-class hydrodynamic testing facility designed, constructed, and commissioned at the University of Western Australia. This facility allows the replication of near-seabed conditions during tropical cyclones in controlled laboratory conditions, and observation of the interaction between ocean, seabed, and pipeline. Tests were performed using a range of pipeline embedment profiles, storm realizations, and pipe fixity conditions simultaneously to model hydrodynamic loading onto the pipeline and seabed scour. These data were then used in the three-dimensional numerical modelling of pipeline response using finite-element analyses, which included the effects of seabed instability.

1753-2116
259-268
Jas, E.
4f663658-b5c6-4dcb-8bfb-e47a622c8b8d
O'Brien, D.
afe6c2c2-301b-4615-9ae7-14892b718c8d
Fricke, R.
e5d5c573-d00a-473e-887f-0b80263049ac
Gillen, A.
2e8fee23-b1db-4371-96c3-415680a94f78
Cheng, L.
5432f3cb-cb52-4db6-8c7e-32d7b5ad830e
White, D.
a986033d-d26d-4419-a3f3-20dc54efce93
Palmer, A.
f03886bd-4364-44f5-bade-886326d8509b
Jas, E.
4f663658-b5c6-4dcb-8bfb-e47a622c8b8d
O'Brien, D.
afe6c2c2-301b-4615-9ae7-14892b718c8d
Fricke, R.
e5d5c573-d00a-473e-887f-0b80263049ac
Gillen, A.
2e8fee23-b1db-4371-96c3-415680a94f78
Cheng, L.
5432f3cb-cb52-4db6-8c7e-32d7b5ad830e
White, D.
a986033d-d26d-4419-a3f3-20dc54efce93
Palmer, A.
f03886bd-4364-44f5-bade-886326d8509b

Jas, E., O'Brien, D., Fricke, R., Gillen, A., Cheng, L., White, D. and Palmer, A. (2012) Pipeline stability revisited. The Journal of Pipeline Engineering, 12 (4), 259-268.

Record type: Article

Abstract

The stability assessment of the 40 in. North Rankin A trunkline, operated by Woodside Energy Ltd., has provided better insight into fluid-soil-pipe interactions during extreme storm events. The resulting conclusion of the work is that the trunkline, a major subsea natural gas artery in Australia's Northwest Shelf since its installation in 1982, can continue to be operated safely for the next 30 years from a hydrodynamic stability point of view. This conclusion was reached after substantial study and physical model testing was performed considering the tripartite interaction between fluid, seabed, and pipeline. To provide vital information feeding into the stability analysis, a physical model testing programme was developed, and a new world-class hydrodynamic testing facility designed, constructed, and commissioned at the University of Western Australia. This facility allows the replication of near-seabed conditions during tropical cyclones in controlled laboratory conditions, and observation of the interaction between ocean, seabed, and pipeline. Tests were performed using a range of pipeline embedment profiles, storm realizations, and pipe fixity conditions simultaneously to model hydrodynamic loading onto the pipeline and seabed scour. These data were then used in the three-dimensional numerical modelling of pipeline response using finite-element analyses, which included the effects of seabed instability.

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More information

Published date: December 2012

Identifiers

Local EPrints ID: 419914
URI: http://eprints.soton.ac.uk/id/eprint/419914
ISSN: 1753-2116
PURE UUID: 83eb242c-0351-465e-85df-af0c64c39223
ORCID for D. White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32

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Contributors

Author: E. Jas
Author: D. O'Brien
Author: R. Fricke
Author: A. Gillen
Author: L. Cheng
Author: D. White ORCID iD
Author: A. Palmer

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