Riser considerations for an ultra deepwater FDPSO

摘要

Free-standing multi- or single-line tower risers need anchored bases, lateral spools probably more than 200 m (656 ft) long from the wells, and short connecting spools between the lateral spool ends and the bottom of the tower. A flexible U-catenary "jumper" is used to connect each flowpath from the buoyant top of the tower to the FPU. Lateral current may cause a large "leaning" deflection, and/or oscillations of the buoyancy tank and tower called vortex-induced vibration (VIV).