Flexible products such as power cables, flexible pipes and umbilicals may display torsion-related motion under handling, including production, load-out and installation. The torque encountered are a function of the shape of the route they follow, so routes must be designed to minimize the torques generated during handling. SINTEF Ocean evaluated the torque generated when handling cables with DEME’s cable installation & multipurpose vessel - Living Stone.

The objective of the study was to evaluate the relative magnitude of the “flip” torque induced by internal friction when the flexible product follows various routes: a proposed new concept (ConnecTT) is thus compared to the existing route on board Living Stone, and in particular, to the torques developed in a loading catenary (quayside chute to CLV chute), and the torque generated in the free span into the carousel. Both of these catenaries are inherent to any cable lay vessel, and therefore provide a good benchmark to compare results.

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