A promising possibility to reduce costs in pipelines that require corrosion resistant alloys (CRA) is the use of lined pipe, consisting of a carbon steel load-bearing outer pipe that provides the structural capacity and a CRA liner, protecting the carbon steel outer pipe from the transported corrosive product. The objective of the current research is to identify all variables that do influence the mechanical behaviour of lined pipe during bending and to determine their influence on this behaviour. The parameters that determine the resistance to pipe ovalisation and liner wrinkling are to be quantified, enabling safe and economic design of lined pipe for installation. In this paper liner wrinkling behaviour under axial compression is studied for two situations: the liner pipe without outer pipe and the liner pipe confined in the outer pipe. For the liner pipe confined in the outer pipe, the snug-fit situation is studied. Snug-fit indicates that there will be no gripping stresses, neither a gap between the liner and the outer pipe. The snug-fit situation is studied both without friction and with very high frictional contact between liner and outer pipe. Finite element models (FEM) and results are presented and discussed.
To keep up with the increasing energy demand, the offshore industry is pushing to explore more difficult reservoirs, in more harsh environments, or containing products with more difficult characteristics, such as extensive corrosive characteristics. As a consequence, a larger volume of untreated products, which can be corrosive because of the presence of water, CO2 and/or H2S, needs to be transported over longer distances from the well to the processing plant. Lined pipe consists of a carbon steel load bearing outer pipe that provides the structural capacity and a corrosion resistant alloy (CRA) liner, protecting the carbon steel outer pipe from the transported corrosive product.