Marine riser having variable buoyancy

Details Marine riser having variable buoyancy Marine riser having variable buoyancy

1998-08-11

1999-12-21

Bagnell, David

Hydraulic and earth engineering

Marine structure or fabrication thereof

405224, 4052242, 166350, 166367, E02B 1138

Patent

active

060040742

ABSTRACT:
A variable-buoyancy marine riser and a method for providing and adjusting the buoyancy for such a riser. The riser is comprised of a main riser conduit on which a plurality of cans are affixed. A slurry of buoyant material, e.g. small, hollow spheres, is pumped into the cans to displace the seawater therein and give buoyancy to the riser. When it is desired to reduce the buoyancy of the riser, the spheres are removed by merely opening the cans and allowing the surrounding seawater to displace the spheres from the cans.

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