Submerged pipeline manifold for offloading mooring buoy and meth

Details Submerged pipeline manifold for offloading mooring buoy and meth Submerged pipeline manifold for offloading mooring buoy and meth

1999-04-21

2000-08-29

Lillis, Eileen D.

Buoys, rafts, and aquatic devices

Buoy

For mooring a vessel

4052242, B63B 2202

Patent

active

061099899

ABSTRACT:
In certain offshore locations, for example off the West Coast of Africa, FPSO facilities provide an offloading facility to receive and load produced crude oil onto shuttle tankers. In such arrangements FPSO facilities use spread moored tankers with flowlines suspended in the water column to an offloading buoy or buoys which are located 1,000 to 1,500 meters away from the FPSO. Typically steel pipe flowlines as used with intermediate floatation to provide a suitable configuration that will avoid detrimental loads being imposed resulting from relative motions of the FPSO and the offloading buoy. According to the invention, a Suspended Pipe Line End Manifold (SPLEM) is connected to the end of the flowline assembly for support during towout. The SPLEM is positioned near the buoy and then connected at the sea surface to the bottom of the buoy by flexible leads such as anchor chains. The SPLEM is then flooded by selectively flooding compartments to cause it to sink to an operational position below the buoy. Next, additional submarine hoses or flexible pipe are connected to complete the flowline to the buoy.

REFERENCES:
patent: 3118155 (1964-01-01), Siegel
patent: 3236267 (1966-02-01), Bily
patent: 3602174 (1971-08-01), Gorman
patent: 3641602 (1972-02-01), Flory et al.
patent: 3677310 (1972-07-01), Dobler et al.
patent: 3840927 (1974-10-01), Reid, Jr.
patent: 3979785 (1976-09-01), Flory
patent: 4321720 (1982-03-01), Havre
patent: 4891495 (1990-01-01), Araki
patent: 4892495 (1990-01-01), Svensen

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