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G. Chatzopoulou, University of Thessaly, Volos, Greece
S.A. Karamanos, University of Thessaly, Volos, Greece
G.E. Varelis, PDL Solutions (Europe) Ltd, Hexham, United Kingdom
Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering - OMAE2015, At St. John's, Newfoundland, Canada
Thick-walled steel pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive pipe ovalization with catastrophic effects. The resistance of offshore pipes against this instability depends on imperfections and residual stresses due to the line pipe manufacturing process. The present study examines the effect of UOE line pipe manufacturing process on the structural response and resistance of offshore pipes during the installation process using advanced finite element simulation tools. The cold bending induced by the UOE process is simulated rigorously and, subsequently, the application of external pressure and structural loading (bending or axial force) is modelled, until structural instability is reached. A parametric analysis is conducted, focusing on the effects of line pipe expansion on the structural capacity of the pipe. The results show that there exists an optimum expansion at which the highest pressure capacity is achieved. The effect of the axial tension on the pressure capacity of the pipe is examined as well.
Furthermore, the influence of the line pipe expansion on bending capacity in the presence of external pressure is also identified. Finally, a simplified methodology is employed, accounting for the material anisotropy induced by the manufacturing process, capable of determining the structural capacity of a UOE pipe in a simple and efficient manner with good accuracy, using more conventional modelling tools.
Posted: 27th Aug 2015 in 'PDL Research and Collaboration'
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PDL, steel pipes, deep-water, loading, external pressure, axial tension, structural instability, pipe ovalization, offshore, residual stress, manufacturing process, UOE, cold bending, parametric analysis, pipe expansion, PDL, PDL Group, PDL Solutions, reduce development costs, mitigate risk, engineering design analysis, consultancy services, Global dynamic analysis, Orcaflex, Finite Element Analysis, FEA, Computational Fluid Dynamics, CFD, Engineering Design, CAD, Multibody Dynamics, RecurDyn