| 摘要 |
A mid-water tethered buoyant support assembly for a riser system for use in water is described to bring fluids from seabed equipment to a production vessel at the surface. The tethered buoyant support assembly comprises at least two tethers (6) from seabed anchors, at least one beam assembly (2) extending between and connected to the tops of the tethers, buoyancy means (7) to maintain tension in the tethers, and hangers (10) for lower riser portions mounted at spaced positions along the beam assembly, each hanger (10) being positioned so that the line of action of the tension due to the weight of the suspended lower riser portion is close to or on a line extending between the connections of the beam to the tethers (6) to minimize or eliminate turning moment to the beam assembly (2) tending to cause rotation of the beam around its major axis as a result of the weight of the suspended lower riser portion. The assembly is particularly designed for use in deep water.
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