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Mechanically-Lined Pipes for Deep-Water Hydrocarbon Pipeline Applications

Mechanically-Lined Pipes for Deep-Water Hydrocarbon Pipeline Applications

Spyros A. Karamanos Professor of Mechanical Engineering, University of Thessaly, Volos, Greece Professor & Chair of Structural Engineering, The University of Edinburgh, Scotland, UK Wednesday 22/5/2019, Time:13:00 Room A2, Civil Engineering Department

Abstract: Mechanically-lined pipes are promising solutions for energy pipeline applications (oil & gas) to resist internal pipe corrosion; a corrosion-resistant thin-walled liner is fitted inside a carbon-steel outer pipe. The paper focuses on wrinkling of mechanically-lined pipes, which are candidates for deep offshore pipeline applications, in depths that often exceed 1,500 meters. In particular, they are used in reeling applications, where severe bending loading conditions occur, associated with bending strains up to 2% during spooling the pipe around the reel. Τhe liner pipe is laterally confined due to the outer carbon steel pipe and this interaction between the liner and the outer pipe has a decisive influence on the bending behavior of the thin-walled liner. The problem is solved numerically, using advanced finite element tools, which simulate the lined pipe and its interaction with the outer pipe. Stresses, strains and local buckles are monitored throughout the deformation stage with emphasis on possible detachment of the liner from the outer pipe and the formation of wrinkles at the compressive zone of the liner pipe. The influence of manufacturing process on the values of curvature at which liner wrinkling occurs are determined. The numerical results are compared successfully with available experimental data.