Two independent sets of analytical solutions have been derived for calculation of displacements and stresses in elastic multi-layer cylinders subjected to both pressure and thermal loading. The solutions are computationally efficient and easily implemented, and thus suitable for engineering applications. In particular, the novel solutions are relevant for offshore pipelines and risers, since the impact of internal and external coating layers on the stress state in the pipe wall often is disregarded or assessed by simplified methods in current pipeline engineering practice. Recursive solutions are obtained both for the case of uniform temperature in each cylinder layer and for the case of radially varying temperature in each cylinder layer. Both plane stress and plane strain conditions are considered. In addition, a recursive solution of the heat equation is derived for steady-state conditions. Applicability of the solutions is illustrated by using them on an offshore pipeline with a corrosion-resistant liner and multi-layered thermal insulation coating. It is demonstrated that coating layers, generally disregarded in conventional pipeline design, may have a non-negligible impact on hoop stresses and the true wall axial force.
Efficient analytical solutions for heated and pressurized multi-layer cylinders
Ocean Engineering ; 92 ; 285-295
2014
11 Seiten, 47 Quellen
Article (Journal)
English