초록 ▼

A riser arrangement increases the stability and/or decreases sensitivity to vortex induced vibration of risers of a riser system including steel tubular lines, SCRIBS and flexible hose risers leading to a floating storage/production vessel. A cross-link is placed between two or more steel tubular li

A riser arrangement increases the stability and/or decreases sensitivity to vortex induced vibration of risers of a riser system including steel tubular lines, SCRIBS and flexible hose risers leading to a floating storage/production vessel. A cross-link is placed between two or more steel tubular lines in order to enhance the stability of the riser system. Devices are coupled to the steel tubular lines for increasing their tension in order to increase the natural frequency of vibration in order to reduce sensitivity to vortex induced vibration.

대표청구항 ▼

[ What is claimed is:] [1.] An improved riser arrangement for a moored floating facility, the arrangement including a plurality of risers, each of which provides a fluid flow path between a seabed position and the floating facility in the sea, where each riser includes,a steel catenary riser which e

[ What is claimed is:] [1.] An improved riser arrangement for a moored floating facility, the arrangement including a plurality of risers, each of which provides a fluid flow path between a seabed position and the floating facility in the sea, where each riser includes,a steel catenary riser which extends from a first end at a seabed position to a second end at a submerged depth position in the sea, said steel catenary riser having a catenary shape between said seabed position at said first end and said submerged depth position at said second end,a flexible riser coupled at one end to said second end of said steel catenary riser to form a fluid flow path from said seabed position to an opposite end of said flexible riser, said opposite end of said flexible riser being coupled to said floating facility, anda submerged steel catenary riser interface buoy positioned at said submerged depth position which supports said steel catenary riser and said flexible riser at said submerged depth position, where each steel catenary riser interface buoy for a riser is independent of each other steel catenary riser interface buoy for any other riser of said plurality of risers,said improved riser arrangement including an improvement which comprises,a cross-link positioned between and coupled to at least two of said steel catenary risers, said cross-link thereby enhancing stability of said steel catenary risers.