MECHANICAL BEHAVIOUR OF LINED PIPE DURING BENDING, NUMERICAL AND EXPERIMENTAL RESULTS COMPARED

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 corrosion-resistant alloy (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 have an influence on the mechanical behaviour of lined pipe during bending. The parameters that determine the resistance to pipe ovalisation and liner wrinkling have to be quantified, enabling safe and economic design of lined pipe for installation. In this paper, the influence of friction and mechanical bond on the behaviour of lined pipe during bending is investigated in three dimensional computational models. The numerical results are compared with the results of pure bending tests.