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Strategies for quantifying the installation reliability of skirted subsea foundations

Strategies for quantifying the installation reliability of skirted subsea foundations
Strategies for quantifying the installation reliability of skirted subsea foundations

An increasing number of well-related and pipeline-related subsea structures (e.g. PLETs, ILTs, buckle initiators, etc.) are being placed on the seabed. Many of these structures are founded on unskirted and skirted mudmat foundations as a costeffective, low risk solution. Much attention has been placed in the literature on the geotechnical capacity of subsea mudmat foundations, but less attention on how these types of foundations are installed. In some soil conditions this can be a critical aspect of design: the requirement to add skirts to ensure sufficient foundation capacity comes with the penalty of increasing the necessary foundation weight to ensure that these skirts can be reliably installed. The addition of weight to a foundation increases its installation and fabrication cost and so requires careful treatment in design. As an example of this design optimization process, attention is given to dealing with uncertainty associated with variable soil conditions. It is shown how probabilistic geotechnical analysis can give a clearer perspective of cost and risk and how carefully targeted site investigation can also be used in this context.

American Society Of Mechanical Engineers (ASME)
Bransby, M.F.
89f400b2-6f20-4b5c-b163-965df69b1f02
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Xie, Y.
9f8aab1d-c405-47c6-afcc-d3c2209527a4
Bransby, M.F.
89f400b2-6f20-4b5c-b163-965df69b1f02
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Xie, Y.
9f8aab1d-c405-47c6-afcc-d3c2209527a4

Bransby, M.F., White, D.J. and Xie, Y. (2015) Strategies for quantifying the installation reliability of skirted subsea foundations. In Offshore Technology; Offshore Geotechnics. vol. 1, American Society Of Mechanical Engineers (ASME). 8 pp . (doi:10.1115/OMAE2015-42340).

Record type: Conference or Workshop Item (Paper)

Abstract

An increasing number of well-related and pipeline-related subsea structures (e.g. PLETs, ILTs, buckle initiators, etc.) are being placed on the seabed. Many of these structures are founded on unskirted and skirted mudmat foundations as a costeffective, low risk solution. Much attention has been placed in the literature on the geotechnical capacity of subsea mudmat foundations, but less attention on how these types of foundations are installed. In some soil conditions this can be a critical aspect of design: the requirement to add skirts to ensure sufficient foundation capacity comes with the penalty of increasing the necessary foundation weight to ensure that these skirts can be reliably installed. The addition of weight to a foundation increases its installation and fabrication cost and so requires careful treatment in design. As an example of this design optimization process, attention is given to dealing with uncertainty associated with variable soil conditions. It is shown how probabilistic geotechnical analysis can give a clearer perspective of cost and risk and how carefully targeted site investigation can also be used in this context.

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More information

Published date: 2015
Venue - Dates: ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015, St. John's, Canada, 2015-05-31 - 2015-06-05

Identifiers

Local EPrints ID: 419772
URI: https://eprints.soton.ac.uk/id/eprint/419772
PURE UUID: 1b0ba3e8-9a82-4fca-8d6b-3f3988a7bd50
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 20 Apr 2018 16:30
Last modified: 14 Mar 2019 01:24

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