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Lateral resistance of pipes on rocky seabeds: comparison between measurements and models based on synthetic seabeds

Lateral resistance of pipes on rocky seabeds: comparison between measurements and models based on synthetic seabeds
Lateral resistance of pipes on rocky seabeds: comparison between measurements and models based on synthetic seabeds

The behavior of pipelines, cables and umbilicals on rocky seabeds has to date received little research attention. This is despite the marine renewable energy and oil and gas industries relying on these 'pipes' to cross a variety of rocky seabed types in the presence of extreme metocean conditions. Present design solutions are challenging and costly, yet there remains a track record of in-service failures. This paper forms part of a wider research effort being undertaken by the University of Western Australia (UWA) into pipe behavior on rocky seabeds. This work includes the effects intermittent gaps have on hydrodynamic forces, the effect of seabed roughness on enhanced boundary layer thickness and the validity of existing hydrodynamic force models for small diameter cables. In this paper, the lateral resistance of pipes on rocky seabeds is investigated using both physical and numerical testing of model pipes over artificially-created rocky seabeds. Four model pipes of varying diameter have been displaced laterally over 1 m square model rocky seabeds, with a range of pipe to rock diameters. The lateral resistance of the physical pipe tests were recorded using load cells and a digital data-logger. Analysis of the physical test results has enabled comparison to (and refinement of) numerical models as well as improved understanding of the importance of different parameters. Our results show peak frictions above 6 arising under conditions where interface friction is only about 0.3, which contrasts dramatically with the friction value of 0.6 nominated in F109. This work contributes towards generation of new design methods suitable for application to field conditions.

The American Society of Mechanical Engineers
Griffiths, Terry
24b3e648-f03d-4597-a69b-c2f90c2f70eb
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Draper, Scott
efe46b7d-3989-403b-8b19-0b17dd54194f
Leighton, Adam
89e7a9dc-39b1-4a66-bad5-a883e21aac9f
Fogliani, Antonino
10bd8e2f-fda7-4f3b-94af-93047361164f
Griffiths, Terry
24b3e648-f03d-4597-a69b-c2f90c2f70eb
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Draper, Scott
efe46b7d-3989-403b-8b19-0b17dd54194f
Leighton, Adam
89e7a9dc-39b1-4a66-bad5-a883e21aac9f
Fogliani, Antonino
10bd8e2f-fda7-4f3b-94af-93047361164f

Griffiths, Terry, White, David, Draper, Scott, Leighton, Adam and Fogliani, Antonino (2017) Lateral resistance of pipes on rocky seabeds: comparison between measurements and models based on synthetic seabeds. In Offshore Technology. vol. 1, The American Society of Mechanical Engineers. 11 pp . (doi:10.1115/OMAE2017-61418).

Record type: Conference or Workshop Item (Paper)

Abstract

The behavior of pipelines, cables and umbilicals on rocky seabeds has to date received little research attention. This is despite the marine renewable energy and oil and gas industries relying on these 'pipes' to cross a variety of rocky seabed types in the presence of extreme metocean conditions. Present design solutions are challenging and costly, yet there remains a track record of in-service failures. This paper forms part of a wider research effort being undertaken by the University of Western Australia (UWA) into pipe behavior on rocky seabeds. This work includes the effects intermittent gaps have on hydrodynamic forces, the effect of seabed roughness on enhanced boundary layer thickness and the validity of existing hydrodynamic force models for small diameter cables. In this paper, the lateral resistance of pipes on rocky seabeds is investigated using both physical and numerical testing of model pipes over artificially-created rocky seabeds. Four model pipes of varying diameter have been displaced laterally over 1 m square model rocky seabeds, with a range of pipe to rock diameters. The lateral resistance of the physical pipe tests were recorded using load cells and a digital data-logger. Analysis of the physical test results has enabled comparison to (and refinement of) numerical models as well as improved understanding of the importance of different parameters. Our results show peak frictions above 6 arising under conditions where interface friction is only about 0.3, which contrasts dramatically with the friction value of 0.6 nominated in F109. This work contributes towards generation of new design methods suitable for application to field conditions.

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More information

Published date: 2017
Venue - Dates: ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2017, , Trondheim, Norway, 2017-06-25 - 2017-06-30

Identifiers

Local EPrints ID: 417959
URI: http://eprints.soton.ac.uk/id/eprint/417959
PURE UUID: 22dae179-e092-42da-ace8-c18862ecb9d8
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 19 Feb 2018 17:30
Last modified: 18 Mar 2024 03:42

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Contributors

Author: Terry Griffiths
Author: David White ORCID iD
Author: Scott Draper
Author: Adam Leighton
Author: Antonino Fogliani

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