Recent Developments in the Towing of Very Long Pipeline Bundles Using the CDTM Method
Fully integrated pipeline bundles are built and tested onshore. The bundles are towed to the field using the Controlled Depth Towing Hethod (CDTM). Recently this method was used to tow a very long bundle (6.7 km) to the Piper field in the British sector of the North Sea.Time domain simulations were carried out to predict the bundle behaviour in different situations. A discussion of the numerical model will be presented. Several parts of the bundle configuration were model tested and full-scale monitoring was performed during the tow at sea. Bundle tow in still water and survival sea states is discussed as well as the impacts of failure modes on the bundle behaviour.