136 results about "Tension-leg platform" patented technology

A floating power generation assembly has at least three floating units (3400) provided with power generation means (3402, 3404) and floating in a body of water. At least one of the three floating units (3400) is a tension leg platform. The assembly also comprises first anchors secured to a surface beneath the water, and first cables (3414, 3416) connecting the buoyant body (3400) to the first anchors. Second anchors are secured to the underwater surface and connected by second cables (3412) to the floating units (3400). The floating units (3400) are arranged substantially at the vertices of at least one triangle or quadrilateral.

A method and system for attaching a TLP to its tendons using pull-down lines to rapidly submerge the hull to installation draft while compensating for inherent hull instability during submergence and to provide motion arrest and aid in station keeping. The system includes tensioning devices mounted on the TLP, usually one for each tendon. Each tensioning device is equipped with a pull-down line which is connected to the corresponding tendon. The TLP hull is submerged to lock-off draft by applying tensions to the pull-down lines connected to the top of the tensions, or by a combination of applying tensions to the pull-down lines and ballasting the hull. As the tensioners take in pull-down line, the hull submerges, i.e. the draft increases. After lock-off, high levels of tension in the pull-down lines can be rapidly transferred to the connection sleeves by slacking the pull-down lines, thus allowing the TLP to be made storm-safe much faster than by prior art methods which require de-ballasting to tension the tendons. In concert with TLP installation, the method may be used attach the mooring tendons to the seabed by suspending and lowering the tendons into their foundation receptacle in the seabed.

A tension leg platform includes a deck supported on the upper ends of three or more columns interconnected at the lower ends thereof by horizontally disposed pontoons. The columns are battered inwardly and upwardly from the pontoons to the deck. Tendons connected at the columns anchor the platform to the seabed. The footprints of the base of the battered columns and the tendons are larger than the footprint of the deck supported on the upper ends of the columns.

A wind energy-wave energy integration power generation structure based on a floating type tension leg platform comprises a floating type tension leg wind power generation structure and a wave power generation device. The floating type tension leg wind power generation structure comprises a wind turbine, a tower structure, a tension leg type supporting platform structure and a matching power transmission system. The wave power generation device is arranged on the water surface of the tower structure, and the wave power generation device is in coupling connection with the outer side face of the tower structure through a slide way type contact device. The wind energy-wave energy integration power generation structure has the advantages that the structure is reasonable and stable in structural design, the technology is mature in the construction scheme, the supporting platform structure and the power transmission system are shared, construction cost of independently using the wind turbine and the wave power generation device is reduced, the tension leg structure is favorable for optimal control of movement and improvement of utilization efficiency of wave energy. A system of the wind energy-wave energy integration power generation structure can be widely applied to development of deep water wind energy-wave energy resources.

A method and system for attaching a TLP to its tendons using pull-down lines to rapidly submerge the hull to installation draft while compensating for inherent hull instability during submergence and to provide motion arrest and aid in station keeping. The system includes tensioning devices mounted on the TLP, usually one for each tendon. Each tensioning device is equipped with a pull-down line which is connected to the corresponding tendon. The TLP hull is submerged to lock-off draft by applying tensions to the pull-down lines connected to the top of the tensions, or by a combination of applying tensions to the pull-down lines and ballasting the hull. As the tensioners take in pull-down line, the hull submerges, i.e. the draft increases. After lock-off, high levels of tension in the pull-down lines can be rapidly transferred to the connection sleeves by slacking the pull-down lines, thus allowing the TLP to be made storm-safe much faster than by prior art methods which require de-ballasting to tension the tendons. In concert with TLP installation, the method may be used attach the mooring tendons to the seabed by suspending and lowering the tendons into their foundation receptacle in the seabed.

The invention discloses a marine deep water floating platform vortex induced motion model experimental device which comprises a supporting frame, a vertical connecting mechanism and a horizontal connecting mechanism. The supporting frame comprises a top flat plate, a top fixed device and a horizontal fixed device. The vertical connecting mechanism comprises an air floating platform, a pressure spring and a pressure sensor. The air floating platform is formed by an air compressor, a compressed air supply pipe and an air bearing. The horizontal connecting mechanism comprises a mooring connecting member, a tension spring and a pull force sensor. For the shortage of the prior art, the technical problem that a fine platform vortex induced motion test can not be carried out is solved. The device is suitable for a semi-submersible platform and a tension leg platform in the field of marine engineering technology, while the vertical anchoring load is provided for a deep water floating platform, the technical requirements of horizontal plane free movement is maintained, and the device has the advantages of simple structure, convenient operation, stable operation and so on.

A pontoonless tension leg platform (TLP) has a plurality of buoyant columns connected by an above-water deck support structure. The design eliminates the need for subsea pontoons extending between the surface-piercing columns. In certain embodiments, the buoyancy of the columns is increased by the addition of subsea sections of increased diameter (and / or cross-sectional area) to provide the buoyancy furnished by the pontoons of the TLPs of the prior art. A pontoonless TLP has a smaller subsea projected area in both the horizontal and vertical planes than a conventional multi-column TLP of equivalent load-bearing capacity having pontoons between the columns. This reduction in surface area produces a corresponding reduction in the platform's response to ocean currents and wave action and consequently allows the use of smaller and / or less costly mooring systems. Moreover, the smaller vertical projected area results in a shorter natural period which enables a pontoonless TLP according to the invention to be used in water depths where conventional TLPs cannot be used due to their longer natural periods. The absence of pontoons in a multi-column TLP also has the added benefit of providing an unobstructed path for risers to connect with the deck of the platform.

A tether system include tethers each having an upper section (1) attached to a tension leg platform (TLP) (4), and each upper section has a large diameter so that the upper section (1) is positively bouyant. This buoyancy can be designed to compensate for the weight of the lower section (2) of each tether, so as to make the total buoyancy of each tether closer to neutral. The selection process for each section is driven by requirements for buoyancy, stiffness and external pressure resistance.

A floating power generation assembly has at least three floating units provided with power generation means and floating in a body of water. At least one of the three floating units is a tension leg platform. The assembly also comprises first anchors secured to a surface beneath the water, and first cables connecting the buoyant body to the first anchors. Second anchors are secured to the underwater surface and connected by second cables to the floating units. The floating units are arranged substantially at the vertices of at least one triangle or quadrilateral.

Method for construction, deployment, and installation of a wind turbine generator on a floating slip formed concrete tension leg platform / spar (WTG foundation) using gravity anchors. A concrete WTG foundation is built with the ‘slip form’ method, a combination construction / deployment dry dock barge (barge) utilizing wing walls for stability allowing the WTG and WTG foundation to be delivered to the installation site as a complete unit. A split hull hydraulic dump scow facilitates the slip form construction and deployment of the slip-formed gravity anchor(s). The barge is sunk as a dry dock to a draft that permits the WTG / WTG foundation to be floated off. The free floating WTG foundation is ballasted with sea water to its operating draft with 5 feet of freeboard. The tension legs from the gravity anchors are attached to the WTG foundation and snugged with equal tension. The sea water is then removed from the WTG foundation. This process tightens the tension legs to their design loads. The WTG / WTG foundation maintains a relatively large water plane and a 5 foot freeboard. The gravity anchor(s) is constructed from slip formed concrete on a split hull hydraulic dump scow and deployed to the installation site, with tension legs attached for deployment and attachment to the WTG platform.

A pontoonless tension leg platform (TLP) has a plurality of buoyant columns connected by an above-water deck support structure. The design eliminates the need for subsea pontoons extending between the surface-piercing columns. In certain embodiments, the buoyancy of the columns is increased by the addition of subsea sections of increased diameter (and / or cross-sectional area) to provide the buoyancy furnished by the pontoons of the TLPs of the prior art. A pontoonless TLP has a smaller subsea projected area in both the horizontal and vertical planes than a conventional multi-column TLP of equivalent load-bearing capacity having pontoons between the columns. This reduction in surface area produces a corresponding reduction in the platform's response to ocean currents and wave action and consequently allows the use of smaller and / or less costly mooring systems. Moreover, the smaller vertical projected area results in a shorter natural period which enables a pontoonless TLP according to the invention to be used in water depths where conventional TLPs cannot be used due to their longer natural periods. The absence of pontoons in a multi-column TLP also has the added benefit of providing an unobstructed path for risers to connect with the deck of the platform.

The invention provides a floating-type fan and tension leg platform (TLP) transporting and mounting integrated ship and a transporting and mounting method thereof. The floating-type fan and TLP transporting and mounting integrated ship comprises a hull, and a deck of the hull is provided with a towel frame; two pile embracing mechanisms perpendicular to the tower frame are arranged in the height direction of the towel frame and used for clamping a cylinder body of a floating-type fan; the head part of the hull is provided with a U-shaped opening, the U-shaped opening is used for accommodatinga TLP, and at least one positioning device is arranged at the position, located on the deck of the hull, on the upper portion of the U-shaped opening; and the positioning devices are used for fixing the TLP to the interior of the U-shaped opening. According to the floating-type fan and TLP transporting and mounting integrated ship, after the floating-type fan and the TLP are mounted at a wharf front edge, the integrated ship directly gets close to the floating-type fan and the TLP, and transporting and mounting are finished; it is ensured that the integrated ship has sufficient stability and the securing strength in the transporting and mounting process through the pile embracing mechanisms and the positioning devices; and base ship loading, towage transportation and mooring mounting and the like can be completed at a time, ship machine equipment and the manual cost are saved, and the mounting efficiency of the fan is improved accordingly.

A tension-based tension leg platform (TBTLP) for use in ultra deepwater applications to support dry-tree oil and gas production utilizes a tension base or artificial seabed that simplifies tendon design at deepwater locations in harsh environment and has a truss pontoon structure that reduces vertical and horizontal wave loadings. The platform may include a riser support tower that makes production risers feasible in 8,000 ft water depths without riser pretension to the hull and reduces or eliminates vortex induced vibration problems.

A tension leg platform that is stable with a quayside-integrated deck without the use of temporary stability modules or specialized installation techniques. The hull preferably consists of four radially-oriented vertical corner columns connected with four central ring pontoon segments. The vertical columns are fixed to the outer periphery of the central pontoon. The columns are characterized by a major radial axis and a minor transverse axis. The mooring system includes tendons supported at tendon porches directly at the four column outboard lower corners, without additional radially-extending tendon support structures.

An apparatus and method for ballasting and de-ballasting a vessel having a hull with several watertight ballast compartments. In a first embodiment, a pressure tank is isolatably and fluidly coupled to a common sea chest, to the atmosphere, to ballast compartments via a distribution manifold, and to a source of compressed gas. The pressure tank is first vented and filled with water from the sea chest, then isolated. The filled tank is then coupled to a ballast tank and the source of compressed gas, which displaces water from the tank to the ballast compartment. In other embodiments, ballasting is by venting and flooding compartments using individual sea chests located within the ballast compartments or a firewater system. For de-ballasting, compressed gas displaces ballast water through overboard discharges, through the common sea chest via the pressure tank, or through individual sea chests located within the ballast compartments.

The invention discloses a tension leg platform based vertical axis wind turbine and vertical-horizontal two-direction wave power generation integrated structure, and belongs to the field of ocean energy utilization. The integrated structure comprises a vertical axis wind turbine, a two-direction wave power generation device, two-direction hydraulic power generation systems located in the two-direction wave power generation device, a tower structure, a tension leg platform structure and a matched power transmission system. Relative vertical motion of the two-direction wave power generation device and the tower structure drives a vertical piston (or relative horizontal motion drives a horizontal piston) to compress liquid in hydraulic cylinders, the liquid passes through first unidirectionalinflow valves (or passes through second unidirectional inflow valves in the reverse direction) to enter hydraulic motors, the hydraulic motors are driven to rotate, and therefore power generation devices are driven to generate power. In addition, tension leg structures can effectively control longitudinal shaking and transverse shaking of a floating platform, good operation of a top fan is facilitated, and huge tower bending moment loads caused by top large-mass cabin inertial motion are controlled.

A cathodic protection method with applied current for a tension leg platform, which is provided with a DC power supply, an auxiliary anode string, a reference electrode and a connecting cable, the negative pole of the DC power supply is connected to the upper part of the platform through a cathode cable, and the positive pole is connected to the auxiliary anode string through an anode cable Connection, the DC power supply is provided with a reference electrode terminal, the DC power supply is connected to the reference electrode through the electrode terminal, and the reference electrode is installed and fixed on the tension leg platform and immersed in seawater. The invention can effectively protect the tension leg platform and prevent seawater from corroding the tension leg platform, and is especially suitable for a large tension leg platform; moreover, it is easy to install, has a long protection life and strong reliability.

An apparatus and method for ballasting and de-ballasting a vessel having a hull with a plurality of watertight ballast compartments wherein each ballast compartment has an individual pump caisson extending vertically to the top of the hull, but the ballast / de-ballast system contains no valves within the hull. An external caisson is used to provide a source of seawater. Several submersible pumps are available for rigging into and out of the internal and external caissons and provide the ballast and de-ballast operations via an installed manifold system at the top of the columns. Venting of the ballast tanks may be accomplished through a connection to atmosphere near the top of the pump caissons.

A tension leg platform includes a deck supported on the upper ends of three or more columns interconnected at the lower ends thereof by horizontally disposed pontoons. The columns are battered inwardly and upwardly from the pontoons to the deck. Tendons connected at the columns anchor the platform to the seabed. The footprints of the base of the battered columns and the tendons are larger than the footprint of the deck supported on the upper ends of the columns.

The invention discloses a floating installation method for an upper assembling block of a tension leg platform. The floating installation method includes the following installation steps: 1, pulling a lower floating body to an installation sea area, and fixedly connecting the lower floating body; 2, connecting the upper assembling block with a power positioning ship, and dryly pulling the upper assembling block to the installation sea area; 3, monitoring the movement of the lower floating body and the movement of the power positioning ship; 4, when the installation requirement is met, starting ship entering work; 5, after the lower floating body is submerged to be at the set immersion depth, adjusting the position of the upper assembling block and the position of the lower floating body, and preparing butt joint work; 6, enabling the lower floating body to continuously float till the lower floating body is in contact with the upper assembling block, transferring the weight of the upper assembling block to the lower floating body, and enabling the ship to get out of the lower floating body and be driven out of the installation sea area; 7, fixing the upper assembling block and the lower floating body, and continuously and wetly pulling the upper assembling block and the lower floating body to a final working sea area for other-part installation. According to the floating installation method, after the upper assembling block and the lower floating body are independently built, floating installation is completed on the sea; influences of a building site on assembling block installation are greatly reduced, and the on-sea connecting debugging and installation time is saved.

The invention discloses a tension leg platform capable of being provided with wide pontoons, for short, WTLP. The tension leg platform capable of being provided with the wide pontoons comprises an upper module, lower floating bodies, tension leg systems and bottom foundations. Stand columns are arranged on the lower side of the upper module and support the upper module. A plurality of tension legs are arranged on bottom corners of the lower floating bodies to be connected with the bottom foundations, and the tension legs provide downward pull force for the platform to fix the platform. According to the WTLP, since square-to-circular transitional section connecting structures are arranged between the round stand columns and the square pontoons, the pontoons can be designed wider to increase bottom buoyancy and improve self-floating stability on the basis of adopting the round stand columns to guarantee the in-place performance of the platform, the upper module and the lower floating bodies can be integrally built in wharfs and building sites where the fairway depths are limited, and a wet-dragging transporting mode can be adopted; and meanwhile, the design of the wide pontoons enables the pontoons to be thinner, and thus current loads borne by the platform when the platform is in place can be decreased advantageously, and the in-place performance of the TLP is improved.

The invention discloses a hoisting and righting method for a tension tendon of a tension leg platform. The hoisting and righting method for the tension tendon of the tension leg platform comprises the following steps that 1, an upper section and main body section of the tension tendon is arranged on a deck of a floating crane ship; 2, a floating crane rigging hoisting device is connected and an auxiliary hoisting device is connected; 3, amplitude varying operation is carried out, so that the upper section and main body section of the tension tendon is slowly lifted and is kept horizontal after leaving the deck of the main ship by a certain distance, at the moment, the amplitude variation of a crawler crane and the height of a lifting hook of the crawler crane are not changed, then the amplitude varies continuously, a floating crane rotates, and a floating crane lifting hook is lifted, so that the upper section and main body section is righted stably and safely in the air; 4, the triangular plate auxiliary hoisting device is loosened, a lifting bucket falls off slowly and freely, a hoisting belt freely slides out of the bottom of the upper section and main body section, and hoisting and righting are completed; and 7, the hoisting and righting steps are repeated to complete the righting of a bottom section. According to the method, not only the tension tendon can be hoisted and turned, the construction operation risk is greatly reduced, but also the construction efficiency is greatly improved.

The invention provides a deep water tension leg platform device and belongs to the technical field of marine engineering. The deep water tension leg platform device comprises a working platform, floating bodies, a plurality of tension legs and a plurality of top tensioned vertical pipes. Six upright columns are fixedly connected on the lower side face of the working platform. The lower ends of the six upright columns are fixedly connected to the upper side faces of the floating bodies. Working holes are formed in the middle parts of the floating bodies. A plurality of floating cases are uniformly arranged on the side walls of the floating bodies. The tension legs are vertically arranged and in one-to-one correspondence with the floating cases. The upper ends of the tension legs are connected to the floating cases, and the lower ends of the tension legs are fixed in a seabed. The upper ends of the top tensioned vertical pipes are connected with the lower side face of the working platform through tensioners, and the lower ends of the top tensioned vertical pipes are fixed in the seabed. A plurality of annular airbags are arranged on the outer walls of the top tensioned vertical pipes in the axial direction, each annular airbag communicates with a gas pump through a gas pipe, and the gas pump is arranged in the working platform. Extra tension force can be provided for the top tensioned vertical pipes through the deep water tension leg platform device, the impact of an environmental load on the top tensioned vertical pipes is small, and the stability of the whole platform device is good.

The invention belongs to the technical field of offshore work platforms and particularly relates to a tension leg platform which comprises a platform body, a tension leg and four anchors. The four anchors are located below the front left portion, the front right portion, the back left portion and the back right portion of the platform body respectively. The tension leg comprises four vertical steel cables and four inclined-pulling steel cables. A front left underwater tension winch, a front left underwater anchoring winch, a front right underwater tension winch, a front right underwater anchoring winch are arranged at the front end of the upper portion of the platform body. A back left underwater tension winch, a back left underwater anchoring winch, a back right underwater tension winch and a back right underwater anchoring winch are arranged at the back end of the upper portion of the platform body. The four underwater tension winches respectively vertically draw the four anchors through the four vertical steel cables, and the four underwater anchoring winches are respectively connected with the four anchors through the four inclined-pulling steel cables. The tension leg platform has the advantages of solving the technical problem of underwater unmanned remote control and being capable of resisting underwater turbulent flow and complex operation load change by utilizing self adaptation characteristics of a tension leg support system.

The invention provides a combining process for topside structures and hull structures of tension leg platforms. The process includes the following steps that firstly, after bearing sliding ways are laid on a general assembly platform of a dock, topsides of the tension leg platforms are established on the bearing sliding ways, and hulls are established in the dock; secondly, bearing trusses are arranged between the tension leg platforms and the dock and first sliding ways are arranged on the bearing trusses; thirdly, second sliding ways are arranged on the tension leg platforms; fourthly, temporary connecting boxes are arranged between the hulls and the tension leg platforms; fifthly, third sliding ways are laid on the first sliding ways, the second sliding ways and the temporary connecting boxes; sixthly, each topside is moved to the portion among uprights of the corresponding hull; seventhly, the uprights are provided with hydraulic lifting devices; eighthly, the topsides are lifted to the set positions to be fixed; and ninthly, the temporary connecting boxes are dragged to a deep-water region, sunk and separated from the tension leg platforms. By the adoption of the combining process, the topsides and the hulls can be established at the same time and integrally combined, and general assembly and combination efficiency is improved; and the risks of offshore operation are reduced.