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Lateral buckling of subsea pipelines triggered by dual sleepers
Abstract Under high temperature and high pressure (HT/HP) conditions, unburied subsea pipelines may buckle horizontally on the seabed in an uncontrolled manner, which may lead to the failure of the pipeline. So buckle initiators, such as sleepers, will be employed to trigger buckles at planned locations. In this study, mathematical models are proposed to simulate lateral buckling of subsea pipelines triggered by dual sleepers with a gap between them. Analytical solutions of the vertical and lateral deformation for the pipeline with dual sleepers are derived first. Comparisons between the results obtained in this study and in the literature are presented and discussed. Then, the influence of the dual sleepers on the buckled configuration and the post-buckling behaviour is analysed. A parametric analysis about the minimum critical temperature difference, the displacement amplitude and the maximum stress is discussed in detail. Finally, the influence of nonlinear lateral pipe-soil interaction on the post-buckling behaviour is discussed. The results show that the formula derived in this study can simulate both single sleeper and dual sleepers to trigger lateral buckles. When dual sleepers are employed, the minimum critical temperature difference and the maximum stress are reduced compared to single sleeper, which will decrease further through increasing the spacing between the dual sleepers, increasing the sleeper height or decreasing the sleeper friction coefficient. The sleeper friction coefficient must be controlled strictly.
Lateral buckling of subsea pipelines triggered by dual sleepers
Abstract Under high temperature and high pressure (HT/HP) conditions, unburied subsea pipelines may buckle horizontally on the seabed in an uncontrolled manner, which may lead to the failure of the pipeline. So buckle initiators, such as sleepers, will be employed to trigger buckles at planned locations. In this study, mathematical models are proposed to simulate lateral buckling of subsea pipelines triggered by dual sleepers with a gap between them. Analytical solutions of the vertical and lateral deformation for the pipeline with dual sleepers are derived first. Comparisons between the results obtained in this study and in the literature are presented and discussed. Then, the influence of the dual sleepers on the buckled configuration and the post-buckling behaviour is analysed. A parametric analysis about the minimum critical temperature difference, the displacement amplitude and the maximum stress is discussed in detail. Finally, the influence of nonlinear lateral pipe-soil interaction on the post-buckling behaviour is discussed. The results show that the formula derived in this study can simulate both single sleeper and dual sleepers to trigger lateral buckles. When dual sleepers are employed, the minimum critical temperature difference and the maximum stress are reduced compared to single sleeper, which will decrease further through increasing the spacing between the dual sleepers, increasing the sleeper height or decreasing the sleeper friction coefficient. The sleeper friction coefficient must be controlled strictly.
Lateral buckling of subsea pipelines triggered by dual sleepers
Wang, Zhenkui (Autor:in) / Tang, Yougang (Autor:in) / Duan, Nuo (Autor:in)
Applied Ocean Research ; 116
01.09.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
On lateral and upheaval buckling of subsea pipelines
| Elsevier | 2013
On lateral and upheaval buckling of subsea pipelines
| Online Contents | 2013