摘要:
Apparatus and methods for environments subject to vortex induced vibration. The system includes a shroud having a number of perforations, with the shroud encircling the flowing-fluid element less than 100%. The system further includes a separation member for attaching the shroud to the flowing-fluid element.
摘要:
A precast, modular marine structure and method of constructing the same for offshore use, including but not limited to drilling, oil and gas production, and oil storage in a variety of water depths. The marine structure includes an equalized pressure system and concrete modular components cast with at least one cell and a central longitudinal passageway. The equalized pressure system fluidly connects the cell(s) to the adjacent body of water by at least one substantially vertical segmented water column to equalize the hydrostatic pressure differential experienced at a wall of the marine structure. A truss section may be attached to the concrete portion of the marine structure to form a truss spar. A mooring and tether system may be included to maintain the marine structure's station and attitude. Construction of a marine structure includes assembly line techniques to form and cast individual modular components (such as a segment or module) in a position which encourages the pouring and curing of a concrete slurry; slipping the modular component from its form; translating the modular component into a position for mating with other modular components; and mating and connecting modular components with tendons to achieve a unitary marine structure.
摘要:
A marine platform (and method of installation) provides a plurality of buoys, a platform having a peripheral portion that includes a plurality of attachment positions, one attachment position for each buoy, and an articulating connection that connects each buoy to the platform at a respective attachment position, the connection allowing for sea state induced buoy motions while minimizing effect on the platform. A method of installation places the platform (including oil and gas drilling and/or production facility next to the buoys. Ballasting moves the platform and buoys relative to one another until connections are perfected between each buoy and the platform.
摘要:
The installation for carrying out experiments under the condition of weightlessness or microgravity comprises a drop tube immersedin water with its end closed by a bottom. The upper end of the tube carries a service room above the surface of the water. The drop tube is connected to the floor of the water by means of an anchor chain connected to the tubes bottom and an anchor. The tube is kept in upright position by the buoyant force of the water and its tensioned anchor chain. A carriage in the service room can be positionedover the center of the orifice of the tube carrying a drop capsule with an experimental set-up. After releasing the capsule from the carriage it drops down through the tube in free fall. During the fall the experimental set-up is in the state of weightlessness the experiment being influenced accordingly. At the end of its free fall the capsule is caught by a catcing device and subsequently lifted back into the service room by means of a windlass.
摘要:
A reverse osmosis water production apparatus for use in a body of water includes a first section defining a buoyancy chamber and an elongate second section connected to the first section and configured to define an elongate chamber which extends downward beneath a waterline in use. The elongate chamber is provided with a plurality of elongate reverse osmosis membrane tubes, each tube containing a reverse osmosis membrane. A longitudinal axis of each reverse osmosis membrane tube is substantially parallel with a longitudinal axis of the elongate chamber and the reverse osmosis membrane tubes are arranged around a passage.
摘要:
An emitter apparatus is mounted on a marine structure powered by wind or marine hydrokinetic energy to disperse a carbon dioxide sorbent such as sodium hydroxide. The sorbent can be generated by reverse osmosis of seawater with electrolysis of the brine, or delivered from an external supply. Suitable marine structures include offshore wind turbines, marine hydrokinetic generators, offshore oil platforms, merchant vessels, and other fixed and mobile structures. Effective capture is made by dispersing a fine mist or fog of aqueous sorbent from nozzles with a particle size from a nozzle of less than 100 microns. The sorbent reacts with atmospheric carbon dioxide forming carbonates and bicarbonates, which drift and fall to the ocean surface, reducing surface acidity and capturing additional atmospheric carbon dioxide via absorption at the local ocean surface. The resulting carbonates sink to the ocean floor and are there sequestered.
摘要:
The present invention provides a novel floating and renewable energy-powered desalination vessel, which also functions as a wind turbine generator and wave energy generator platform. With energy derived from the wind and waves, the vessel performs reverse osmosis within a vertically positioned cylindrical section extending below a buoyancy chamber. The cylindrical section contains reverse osmosis membranes located above a seawater screening and filtration system, which serve as ballast. The entire vessel and power systems are configured to have the center of mass below the center of buoyancy, forming a vertically stable floating structure with minimum pitch, roll, and wave heave in high sea states. The electric power generated is utilized internally to produce desalinated water or hydrogen from the desalinated water's electrolysis, power an onboard data center, or power delivery to a shoreside power grid. In addition to a wind turbine generator and a wave energy generator, a photovoltaic array or a marine current generator may be utilized to power these applications. Alternatively, the desalination vessel operates with the assistance of shore-based power provided by cable.
摘要:
The present disclosure relates to systems and methods for rotating a floating platform. An example method includes determining a desired position of a floating platform in a yaw axis. The floating platform is fixed by an anchor leg to an underwater attachment point. The method includes receiving, from a position sensor, information indicative of an actual position of the floating platform in the yaw axis. The method also includes rotating the floating platform in a desired direction about the yaw axis based on the desired position and the actual position. Optionally, the floating platform may include a yaw member and an environmental sensor. In such scenarios, the method may include receiving information about a prevailing wind direction or water current direction. The method may include causing the actuator to adjust the yaw member based on at least one of: the prevailing wind condition or the prevailing water current direction.