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Effect of lateral pipe-soil interaction on controlled lateral buckling using pre-deformed pipeline

Effect of lateral pipe-soil interaction on controlled lateral buckling using pre-deformed pipeline
Effect of lateral pipe-soil interaction on controlled lateral buckling using pre-deformed pipeline
A novel approach to eliminate the onset of global buckling in pipelines is investigated in the paper. The method is based on pre-deforming a pipeline continuously with a specific wavelength and amplitude prior to installation on the seabed. The response of the pipeline to applied high temperature and pressure was studied in conjunction with variations in the lateral pipe-soil interaction (PSI) – both as uniform friction along the pipe and also with locally varying friction.

Pipe and seabed parameters representing a typical wet-insulated infield flow line on soft clay are used. The pre-deformed pipeline has a higher buckle initiation temperature compared to a straight pipeline due to the reduced effective axial force build-up resulting from the low axial stiffness generated by the predeformed lobes along the pipeline.

The results from this paper show that the strains in the predeformed pipeline are not significantly affected by the local variability of lateral PSI but rather by the global mean PSI. At a typical lateral soil resistance, i.e. a friction coefficient of 0.5, lateral buckling occurs at a very high temperature level that is not common in the subsea operation. At a very low friction, i.e. 0.1, lateral buckling occurs at a lower operating temperature but the strain is insignificant. The longitudinal strain of the pipeline is not highly sensitive to the lateral PSI, which is a quite different response to an initially straight pipeline. Therefore, this method could prove to be a valuable tool for the subsea industry as it enables the pipeline to be installed and operated safely at very high temperatures without the need for lateral buckling design and installation of expensive structures as buckle initiators.

Even if the pre-deformed pipeline buckles at a very high temperature, during cycles of heat-up and cool-down the buckle shape ‘shakes down’ by geometric rearrangement to minimize the energy, and in doing so creates a series of ‘short pipelines’ in which the longitudinal strain is self-controlled.

The system is therefore shown to be very robust in the conditions investigated and not affected by one of the biggest unknowns in seabed pipeline engineering, which is the local variability in lateral PSI.
Lateral buckling, Pre-deformed Pipeline, Pipe-Soil Interaction (PSI)
V005T04A044
American Society Of Mechanical Engineers (ASME)
Chee, Jayden
8c2766e4-6ec5-45ea-8c9b-25b758f9aad0
Walker, Alastair
213f8012-8f78-4f29-b366-866df23e47e0
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Chee, Jayden
8c2766e4-6ec5-45ea-8c9b-25b758f9aad0
Walker, Alastair
213f8012-8f78-4f29-b366-866df23e47e0
White, David
a986033d-d26d-4419-a3f3-20dc54efce93

Chee, Jayden, Walker, Alastair and White, David (2018) Effect of lateral pipe-soil interaction on controlled lateral buckling using pre-deformed pipeline. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering: Pipelines, Risers, and Subsea Systems. vol. 5, American Society Of Mechanical Engineers (ASME). V005T04A044 . (doi:10.1115/OMAE2018-77154).

Record type: Conference or Workshop Item (Paper)

Abstract

A novel approach to eliminate the onset of global buckling in pipelines is investigated in the paper. The method is based on pre-deforming a pipeline continuously with a specific wavelength and amplitude prior to installation on the seabed. The response of the pipeline to applied high temperature and pressure was studied in conjunction with variations in the lateral pipe-soil interaction (PSI) – both as uniform friction along the pipe and also with locally varying friction.

Pipe and seabed parameters representing a typical wet-insulated infield flow line on soft clay are used. The pre-deformed pipeline has a higher buckle initiation temperature compared to a straight pipeline due to the reduced effective axial force build-up resulting from the low axial stiffness generated by the predeformed lobes along the pipeline.

The results from this paper show that the strains in the predeformed pipeline are not significantly affected by the local variability of lateral PSI but rather by the global mean PSI. At a typical lateral soil resistance, i.e. a friction coefficient of 0.5, lateral buckling occurs at a very high temperature level that is not common in the subsea operation. At a very low friction, i.e. 0.1, lateral buckling occurs at a lower operating temperature but the strain is insignificant. The longitudinal strain of the pipeline is not highly sensitive to the lateral PSI, which is a quite different response to an initially straight pipeline. Therefore, this method could prove to be a valuable tool for the subsea industry as it enables the pipeline to be installed and operated safely at very high temperatures without the need for lateral buckling design and installation of expensive structures as buckle initiators.

Even if the pre-deformed pipeline buckles at a very high temperature, during cycles of heat-up and cool-down the buckle shape ‘shakes down’ by geometric rearrangement to minimize the energy, and in doing so creates a series of ‘short pipelines’ in which the longitudinal strain is self-controlled.

The system is therefore shown to be very robust in the conditions investigated and not affected by one of the biggest unknowns in seabed pipeline engineering, which is the local variability in lateral PSI.

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14 Chee et al 2018 OMAE2018-77154
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More information

Accepted/In Press date: 7 May 2018
Published date: June 2018
Venue - Dates: ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018, Spain, 2018-06-16 - 2018-06-21
Keywords: Lateral buckling, Pre-deformed Pipeline, Pipe-Soil Interaction (PSI)

Identifiers

Local EPrints ID: 422784
URI: http://eprints.soton.ac.uk/id/eprint/422784
PURE UUID: bb8915b1-e23e-4294-87c0-3ee7aa6268b2
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 06 Aug 2018 16:30
Last modified: 07 Oct 2020 02:17

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