[en] This study is concerned with modelling the coupled dynamics of fluid-filled curved pipes subjected to extreme impulse loads. In contrast with current quasi one-dimensional models, the present model is capable of simulating the effects of streamline curvature in the fluid, taking full account of fluid-pipe interaction. Comparison with experiments and with other calculations is included. The model is implemented in the two-dimensional lagrangian code DISCO for fluid-shell interaction, which has a built-in capability for treating a multiple-branched shell. This feature has proven very efficient in representing the infra-structure and the conduit as a branching shell. Two tests for the validity of the model were carried out. The first was a numerical test which compared predictions of the model with axisymmetric three dimensional calculations for a straight pipe. A very satisfactory agreement was found between the pressure and strain time-histories. (orig.)