Upheaval buckling of surface-laid offshore pipeline |
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| Institution: | 1. The Graduate School of Construction Engineering, Chung-Ang University, 84, Huksuk-ro, Dongjak-ku, Seoul, 06974, Republic of Korea;2. Department of Civil and Environmental & Plant Engineering, Chung-Ang University, 84, Huksuk-ro, Dongjak-ku, Seoul, 06974, Republic of Korea;3. Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;4. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;1. ITEAM, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain;2. ICITECH, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain;1. Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17491 Greifswald, Germany;2. Consorzio RFX, Euratom/ENEA Association, 35127 Padova, Italy |
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| Abstract: | Offshore pipelines operating under high pressure and temperature are subjected to upheaval buckling. Pipeline behaviour in upheaval buckling depends on a number of factors including the shape of pipeline imperfection, installation stresses, loading types, seabed sediment behaviour and the flexural stiffness of the pipe. Current method of predicting upheaval buckling is based on simplified shapes of pipeline imperfection developed for idealized seabed conditions. To account for the effect of internal pressure, the pressure load is represented using an equivalent temperature. However, the applicability of these idealizations on the prediction of upheaval buckling has not been well-investigated. In this paper, the three-dimensional finite element modelling technique is used to investigate the applicability of idealized shapes and their effects on the upheaval buckling of pipeline for a seabed condition at offshore Newfoundland in Canada. The finite element model is then used to conduct a parametric study to investigate the effects of installation stress, loading types, seabed parameters and the flexural stiffness of the pipe. Finally, a design chart is developed to determine the optimum height of seabed features to manage pipeline stability against upheaval buckling under different temperature and pressure loadings. |
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| Keywords: | Subsea pipeline Pipeline imperfection Upheaval buckling Installation stress Finite element analysis |
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