Lightweight transfer referencing and mooring system

Details Lightweight transfer referencing and mooring system Lightweight transfer referencing and mooring system

B - Operations, Transporting

63

B

114/59.8

B63B 21/50 (2006.01) B63B 22/02 (2006.01)

Patent

CA 1307704

LIGHTWEIGHT TRANSFER REFERENCING AND MOORING SYSTEM ABSTRACT OF THE DISCLOSURE An offshore fluid transfer system is described for transferring fluid between an underwater pipe and a dynamically positioned vessel at the sea surface, which is relatively lightweight and economical. The system includes a riser having an upper end attached to the vessel and a lower end having a chain table held by chains extending in catenary curves to the sea floor and weighted by a weight hanging by the chain table. The riser supplies substantially the only mooring force most of the time, while thruster equipment on the vessel supplies sufficient additional force a small amount of the time to limit vessel drift in violent storms. The upper several meters of the riser is a rigid pipe, and an instrument that measures tilt of the pipe indicates the amount and direction of drift of the vessel.

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