A semi-submersible platform (40) comprises a plurality of the vessel (1) interconnected by a support structure (3). A main vessel (1b) is configured for carrying a structure such as a wind turbine (6), and a plurality of vessels (1a, 1c) are arranged at a distance from the main vessel (1b) and serve as outrigger vessels to stabilize the main vessel. Each vessel (1) comprises control means for individual control of roll, pitch, and heave motions.
B63B 39/03 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids
B63B 1/04 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
B63B 1/10 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
B63B 39/00 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude
A heave compensated marine vessel (1) configured for floating in a body of water (W), comprising - a chamber (11, 11') of which at least a portion is arranged below the water surface (2) and comprising one or more first fluid ports (7) in a chamber lower region arranged below the water surface (2); - a second fluid port (13') arranged below the water surface (2), said second fluid port (13') fluidly connected to a piston (16) movably arranged in a cylinder (17); - the cylinder being fluidly connected to a gas reservoir container (21) via a first gas conduit (22) and a first valve device (23) and to the atmosphere outside the vessel via second gas conduit (19) and a second valve device (20), whereby movement of water (W) entering the second fluid port drives the piston such that air from the atmosphere outside the vessel is drawn into the cylinder and compressed air is fed into the gas reservoir container (21) from the cylinder; - an opening (24) between the reservoir and the chamber (11), said reservoir opening (24) comprising a reservoir valve (24); - an opening (30) between the chamber (11) and the atmosphere outside the vessel (1), said chamber opening (30) comprising a chamber valve (25); and - control means (41) configured for controlling at least the reservoir valve (24) and the chamber valve (25).
B63B 39/03 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids
B63B 1/04 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
B63B 1/10 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
B63B 39/00 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude
3.
SEMI-SUBMERSIBLE FLOATING PLATFORM FOR DEPLOYMENT OF SINGLE-COLUMN SEMI-SUBMERSIBLE FLOATING FOUNDATION
A semi-submersible floating platform (1) is configured for supporting and transporting a column structure (2), and comprises a plurality of buoyant columns (4a-c) interconnected by a support structure (5) having an adaptive opening (7) for axial and radial fastening of the column structure (2). Each column (4) comprises ballasting means (16, 17) whereby the draft may be controlled, and each column (4) comprises an active heave motion neutralization system that may be operated independently, such that the platform (1) may be maintained stable and level when handling the structure (2), for example during transit, separation and docking. A method of operating the platform involves the operation of valves (20, 22) to control the pressure inside a reservoir (12) in order to control the water level (11) in a rise canister (30) in one or more of the columns (4a-c).
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
B63B 35/42 - Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting marine vessels with adjustable draught
B63B 39/03 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids
B63B 77/00 - Transporting or installing offshore structures on site using buoyancy forces, e.g. using semi-submersible barges, ballasting the structure or transporting of oil-and-gas platforms
A single-column semi-submersible platform for fixed anchoring in deep water. The semi-submersible platform comprises a lower solid ballast module, a middle seawater ballast module and a top buoyancy module. The three modules are arranged telescopically in an axial direction and can be controlled relative to each other in the axial direction such that the semi-submersible platform may float vertically and steadily in a body of water. Draught for the seawater ballast module and buoyancy module is provided by seawater ballasting. The axial position of the solid ballast module relative to the seawater ballast module is controlled by seawater being pumped in and out of a closed annulus formed between the solid ballast module and the seawater ballast module.
B63B 39/02 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude to decrease vessel movements by displacement of masses
A system is demonstrated for heave neutralisation of semisubmersible platforms that can be built into any conceivable configuration of such platforms. That the system is also conceivably active and predicatively can be controlled can be concluded by analysing the appended calculation models. As an example FIG. 18, column E, is mentioned, wherein the water volume increments in the rise canister are 37 cubic metres for each half metre of wave height, so that, with reference to column A, from H=10.5 m to H=12 m is 4×37 148 cubic metres more than 150 tonnes—simultaneously with the air pressure, shown in column K, increasing from 123.86 to 131.05 kPa, a difference of just 6.19 kPa (0.0619 bar or 61.9 millibars). Large ballast volumes can be moved out and in of the system at small pressure changes and short response time.
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
B63B 1/04 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
B63B 1/10 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
B63B 39/03 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids
B63B 39/06 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
A single-column semi-submersible platform (1) for fixed anchoring in deep water.The semi-submersible platform (1) comprises a lower solid ballast module (6), amiddle seawater ballast module (7) and a top buoyancy module (8). The three modules (6,7,8) are arranged telescopically in an axial direction and can be controlled relative to each other in the axial direction such that the semi-submersible platform (1) may float vertically and steadily in a body of water. Draught for the seawater ballast module (7) and buoyancy module (8) is provided by seawater ballasting. The axial position of the solid ballast module (6) relative to the seawater ballast module (7) is controlled by seawater being pumped in and out of a closed annulus (46) formed between the solid ballast module (6) and the seawater ballast module (7). (Figure 1 to be published with the abstract)
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