A foundation (1) for a structure such as an off-shore wind turbine. The foundation (1) comprises a body (4) having a lateral surface (8,9) and a distal end (5) for insertion into a soil (2). At least a region of the lateral surface (8,9) forms a first electrode. A second electrode (7) is provided on the lateral surface (8,9) of the body (4) and is electrically insulated from the first electrode. The body (4) further comprises a spacing formation (6) for forming a gap (11) between the second electrode (7) and the soil (2) when the body (4) is inserted into the soil (2). In use, an electric potential may be established between the electrodes to induce electro-osmosis in the soil for allowing the foundation to be installed more easily. The polarity of the electric potential may also be reversed for stabilising the foundation.

An offshore wind turbine installation vessel includes a crane provided with a computerized crane control system. The computerized crane control system is linked to the slew drive, the luffing drive, and the hoisting winch of the crane, and is programmed to perform a foundation pile installation routine providing a coordinated pattern of slew motion of the superstructure and of luffing motion of the boom structure, as well as operation of the hoisting winch so that the load connector of the crane moves from a foundation pile pick up position thereof, where the load connector is connected to the top end of a horizontally oriented foundation pile stored on a storage deck, to a foundation pile overhoarding position thereof, wherein the foundation pile is in vertical suspended from the load connector, outside of the hull.

The invention relates to a system (1) for use with a crane (4) on a surface vessel (3), comprising a crane tool (15) attached or attachable to a hoisting cable (5) of the crane (4) and one or more adaptors (16) attached or attachable to one or more tools (11-14, 25) for carrying out operations or to one or more components (2, 10), the crane tool (15) comprising a connector (17) and at least one of the adaptors (16) comprising a connector-counterpart (18).

A device includes at least one float. The at least one float is configured to provide a buoyancy force away from a seabed when placed in water. The device also includes an enclosure configured to house the at least one float. The enclosure comprises at least one connection configured to couple the enclosure to a self-elevating unit used in offshore oil operations or offshore gas operations.

A method of elevating the deck area of a marine platform (e.g., oil and gas well drilling or production platform) utilizes a specially configured sleeve support to support the platform legs so that they can be cut. Once cut, rams or jacks elevate the platform above the cuts. The sleeve support is then connected (e.g., welded) to the platform leg and becomes part of the structural support for the platform. In one embodiment, two sleeves are employed. In another embodiment, the jacks or rams elevate in two stages including a first stage wherein one sleeve elevates and the other sleeve does not elevate and a second stage wherein both sleeves elevate together.

A crane housing for a leg encircling crane to be mounted onto a slew bearing includes an annular base component, two support components, and a frontal component, each having bulkheads. The support components are connected to the annular base component at respective lateral sides of a front segment thereof. The frontal component is connected to the front segment of the annular base component, between the two support components such as to interconnect these. The two support components and the frontal component together form a front torsion box, which provides torsional rigidity. The load of the boom, as applied on the support components, subjects the base component via the torsion box to a torsion that is distributed over the front segment of the base component.

A system for offshore, direct carbon dioxide sequestration includes an offshore marine platform fixed to the ocean floor above an offshore, subsea storage reservoir. A carbon dioxide floating storage unit moored adjacent the marine platform gathers and stores carbon dioxide delivered in discreet amounts from carbon dioxide sources. Carbon dioxide sources may include carbon dioxide delivery vessels and a carbon dioxide capture system mounted on the marine platform. Once a desired volume of carbon dioxide has been gathered in the carbon dioxide floating storage unit, compressors in fluid communication with the carbon dioxide floating storage unit may be utilized to increase the pressure of the gathered carbon dioxide to a desired injection pressure, after which the pressurized carbon dioxide is pumped directly from the fixed marine platform into the subsea storage reservoir.

A method is provided for determining an actual achieved pre-load value by monitoring a leg load characteristic during pre-loading. The method further comprises determining an actual crane or cantilever operations envelope taking into account the actual achieved preload instead. The method further comprises taking into account other data such as environmental loads or crane or cantilever movement.

A system and a method for an offshore platform that is self-installing, not requiring use of a heavy lift vessel for installation at a site. The system has a built-in, retractable, suspended, conductor guide support frame assembly coupled to the hull of the platform and serves as lateral guide/support for the well conductors/casings during operational conditions. The conductor guide support frame assembly is generally raised during wet tow/transit. At the site, the conductor guide support frame assembly is lowered and secured into the sea to its designated elevation. The conductor guide support frame assembly generally remains suspended from the hull and does not need to extend all the way to the seabed foundation. After operations are completed, the conductor guide support frame assembly is generally raised up relative to the hull, and the whole platform with the conductor guide support frame assembly relocated for reuse at a new site.

An offshore wind turbine installation vessel includes a crane provided with a computerized crane control system. The computerized crane control system is linked to the slew drive, the luffing drive, and the hoisting winch of the crane, and is programmed to perform a foundation pile installation routine providing a coordinated pattern of slew motion of the superstructure and of luffing motion of the boom structure, as well as operation of the hoisting winch so that the load connector of the crane moves from a foundation pile pick up position thereof, where the load connector is connected to the top end of a horizontally oriented foundation pile stored on a storage deck, to a foundation pile overboarding position thereof, wherein the foundation pile is in vertical suspended from the load connector, outside of the hull.