Changes in pipeline embedment due to sediment mobility: Observations and implications for design
This paper describes temporal variations in embedment of several existing pipelines on the North-West Shelf (NWS) of Australia, and the sediment mobility processes that cause them. Distinct and explainable patterns in the extent, distribution and rate of the development of pipeline embedment have be...
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American Society Of Mechanical Engineers (ASME)
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ftsouthampton:oai:eprints.soton.ac.uk:420227 2023-07-30T04:00:00+02:00 Changes in pipeline embedment due to sediment mobility: Observations and implications for design Rodriguez, Antonio Borges Bransby, M. Fraser Finnie, Ian M.S. Low, Han Eng White, David J. 2013 https://eprints.soton.ac.uk/420227/ English eng American Society Of Mechanical Engineers (ASME) Rodriguez, Antonio Borges, Bransby, M. Fraser, Finnie, Ian M.S., Low, Han Eng and White, David J. (2013) Changes in pipeline embedment due to sediment mobility: Observations and implications for design. In Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013): Volume 4B: Pipeline and Riser Technology. vol. 4 B, American Society Of Mechanical Engineers (ASME). (doi:10.1115/OMAE2013-11425 <http://dx.doi.org/10.1115/OMAE2013-11425>). Conference or Workshop Item PeerReviewed 2013 ftsouthampton https://doi.org/10.1115/OMAE2013-11425 2023-07-09T22:22:13Z This paper describes temporal variations in embedment of several existing pipelines on the North-West Shelf (NWS) of Australia, and the sediment mobility processes that cause them. Distinct and explainable patterns in the extent, distribution and rate of the development of pipeline embedment have been revealed through systematic detailed examination of repeated annual integrity surveys by ROV. This represents a unique data-set that has been used to optimize the reliability of a newly designed pipeline. This paper explains why these clear findings should not be overlooked in both the buckling and stability design of initially unburied pipelines, which is in contrast to currently established industry practice. This new information supports the presumption that conventional approaches for calculating the hydrodynamic stability of unburied pipelines may be more conservative than necessary. Conversely, and arguably more importantly, it is shown that conventionally accepted methods for calculating pipe-seabed resistance forces when planning buckling schemes should be considered unsafe if embedment due to sediment mobility is possible. Consequently, this paper proposes an innovative calculation methodology that statistically captures these sediment mobility effects, and which facilitates a more justifiable geotechnical input to pipeline engineering than what is conventionally adopted. This methodology is currently being used by the authors as a state-of-the-art design practice for unburied offshore pipelines in regions of sediment mobility. Conference Object Arctic University of Southampton: e-Prints Soton Volume 4B: Pipeline and Riser Technology |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
This paper describes temporal variations in embedment of several existing pipelines on the North-West Shelf (NWS) of Australia, and the sediment mobility processes that cause them. Distinct and explainable patterns in the extent, distribution and rate of the development of pipeline embedment have been revealed through systematic detailed examination of repeated annual integrity surveys by ROV. This represents a unique data-set that has been used to optimize the reliability of a newly designed pipeline. This paper explains why these clear findings should not be overlooked in both the buckling and stability design of initially unburied pipelines, which is in contrast to currently established industry practice. This new information supports the presumption that conventional approaches for calculating the hydrodynamic stability of unburied pipelines may be more conservative than necessary. Conversely, and arguably more importantly, it is shown that conventionally accepted methods for calculating pipe-seabed resistance forces when planning buckling schemes should be considered unsafe if embedment due to sediment mobility is possible. Consequently, this paper proposes an innovative calculation methodology that statistically captures these sediment mobility effects, and which facilitates a more justifiable geotechnical input to pipeline engineering than what is conventionally adopted. This methodology is currently being used by the authors as a state-of-the-art design practice for unburied offshore pipelines in regions of sediment mobility. |
format |
Conference Object |
author |
Rodriguez, Antonio Borges Bransby, M. Fraser Finnie, Ian M.S. Low, Han Eng White, David J. |
spellingShingle |
Rodriguez, Antonio Borges Bransby, M. Fraser Finnie, Ian M.S. Low, Han Eng White, David J. Changes in pipeline embedment due to sediment mobility: Observations and implications for design |
author_facet |
Rodriguez, Antonio Borges Bransby, M. Fraser Finnie, Ian M.S. Low, Han Eng White, David J. |
author_sort |
Rodriguez, Antonio Borges |
title |
Changes in pipeline embedment due to sediment mobility: Observations and implications for design |
title_short |
Changes in pipeline embedment due to sediment mobility: Observations and implications for design |
title_full |
Changes in pipeline embedment due to sediment mobility: Observations and implications for design |
title_fullStr |
Changes in pipeline embedment due to sediment mobility: Observations and implications for design |
title_full_unstemmed |
Changes in pipeline embedment due to sediment mobility: Observations and implications for design |
title_sort |
changes in pipeline embedment due to sediment mobility: observations and implications for design |
publisher |
American Society Of Mechanical Engineers (ASME) |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/420227/ |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Rodriguez, Antonio Borges, Bransby, M. Fraser, Finnie, Ian M.S., Low, Han Eng and White, David J. (2013) Changes in pipeline embedment due to sediment mobility: Observations and implications for design. In Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013): Volume 4B: Pipeline and Riser Technology. vol. 4 B, American Society Of Mechanical Engineers (ASME). (doi:10.1115/OMAE2013-11425 <http://dx.doi.org/10.1115/OMAE2013-11425>). |
op_doi |
https://doi.org/10.1115/OMAE2013-11425 |
container_title |
Volume 4B: Pipeline and Riser Technology |
_version_ |
1772810659053961216 |