초록 ▼

A dual phase riser flotation system contains a number of passive phase buoyancy modules of syntactic foam contained within an outer skin, and a number of active phase buoyancy modules which are similar to air canisters in that they may be inflated or deflated as required to provide levels of buoyanc

A dual phase riser flotation system contains a number of passive phase buoyancy modules of syntactic foam contained within an outer skin, and a number of active phase buoyancy modules which are similar to air canisters in that they may be inflated or deflated as required to provide levels of buoyancy. The passive phase buoyancy modules may contain tubes filled with air, a compressed gas such as nitrogen, or evacuated to provide additional buoyancy. Charge and discharge valves connect gas flow lines to a manifold system serving the active phase buoyancy modules.

대표청구항 ▼

[ What is claimed is:] [1.] An underwater riser system comprising:a) a riser;b) a plurality of passive flotation modules disposed along a longitudinal axis of the riser and coupled to the riser;c) a plurality of active flotation modules disposed along the longitudinal axis of the riser and coupled t

[ What is claimed is:] [1.] An underwater riser system comprising:a) a riser;b) a plurality of passive flotation modules disposed along a longitudinal axis of the riser and coupled to the riser;c) a plurality of active flotation modules disposed along the longitudinal axis of the riser and coupled to the riser;d) a gas flow conduit;e) a charge valve connected to the gas flow conduit having a first port connected to the gas flow conduit to selectively allow flow therethrough;f) a manifold coupled circumferentially to the riser and having an inlet sealingly connected to a second port of the charge valve, the manifold also having at least one nipple engaging at least one active flotation module to allow flow thereto;g) a discharge valve conjoined with an outlet of the manifold.