A method for constructing a wind turbine concrete floater including a central connector from which radial arms extend, the central connector carrying a central stability tower, and each arm carrying an outer stability tower. The method includes prefabricating the arms, central connector and at least parts of the stability towers, pre-assembling the central connector with one arm to form a primary pre-assembly, mounting temporary flotation devices onto the arms to provide additional buoyancy to them, floating the primary preassembly and floating the other arms of the floater, and assembling offshore said primary preassembly with said other arms.

A method of transporting a first vessel having wind turbine components to an offshore installation vessel. The method includes (i) securing the first vessel to a second vessel using a first tow line attached to a front end (or bow) of the first vessel, and (ii) securing the first vessel to a third vessel using a second tow line attached to a back end (or stern) of the first vessel. The method further includes transporting the first vessel to the offshore installation vessel using the second vessel and the third vessel secured to the first vessel via the first and second tow lines, respectively. The method also includes securing the first vessel to the offshore installation vessel. The first vessel can include one or more fender walls. The first vessel can be secured to the offshore installation vessel using one or more mooring lines.

A method of transporting a first vessel having wind turbine components to an offshore installation vessel. The method includes (i) securing the first vessel to a second vessel using a first tow line attached to a front end (or bow) of the first vessel, and (ii) securing the first vessel to a third vessel using a second tow line attached to a back end (or stern) of the first vessel. The method further includes transporting the first vessel to the offshore installation vessel using the second vessel and the third vessel secured to the first vessel via the first and second tow lines, respectively. The method also includes securing the first vessel to the offshore installation vessel. The first vessel can include one or more fender walls. The first vessel can be secured to the offshore installation vessel using one or more mooring lines.

A system and method for transporting a wind turbine tower (1). A vessel (6) is used to transport one or more towers (1) to an installation site. A cradle (4) is provided for securing the one or more towers (1) in a horizontal orientation during transportation. An upending device (5,10) is used to transition the one or more towers (1) from the horizontal orientation to a vertical orientation for subsequent connection to a foundation at the installation site.

A system and method for transporting a wind turbine tower (1). A vessel (6) is used to transport one or more towers (1) to an installation site. A cradle (4) is provided for securing the one or more towers (1) in a horizontal orientation during transportation. An upending device (5,10) is used to transition the one or more towers (1) from the horizontal orientation to a vertical orientation for subsequent connection to a foundation at the installation site.

An assembly of vessel and turret is provided. The vessel comprises a moonpool and the turret is mounted in said moonpool for a rotation around a turret axis relative to the vessel. The turret comprises a chain table to which mooring lines are connected and through which risers are conveyed, and a turret table vertically spaced above the chain table and connected therewith by a connecting structure. The connecting structure comprises at least three vertically extending columns positioned such at angular intervals that radially outer sides of the columns are located in the vicinity of an outer circumference of the turret. The risers are conveyed through the chain table in such a way that riser sections above the chain table extend towards the turret table within an internal space of the columns.

An assembly of vessel and turret is provided. The vessel comprises a moonpool and the turret is mounted in said moonpool for a rotation around a turret axis relative to the vessel. The turret comprises a chain table to which mooring lines are connected and through which risers are conveyed, and a turret table vertically spaced above the chain table and connected therewith by a connecting structure. The connecting structure comprises at least three vertically extending columns positioned such at angular intervals that radially outer sides of the columns are located in the vicinity of an outer circumference of the turret. The risers are conveyed through the chain table in such a way that riser sections above the chain table extend towards the turret table within an internal space of the columns.

A method for deploying a payload at a subaquatic deployment location includes submersing a submersible aquatic vehicle in a body of water. The submersible aquatic vehicle carries a payload. The method also includes driving the submersible aquatic vehicle to a deployment location under the body of water while the submersible aquatic vehicle carries the payload in a first position. The method additionally includes at the deployment location, moving the payload from the first position to a second position. The method further includes deploying the payload from the second position to a deployment position at the deployment location.

A method for deploying a payload at a subaquatic deployment location includes submersing a submersible aquatic vehicle in a body of water. The submersible aquatic vehicle carries a payload. The method also includes driving the submersible aquatic vehicle to a deployment location under the body of water while the submersible aquatic vehicle carries the payload in a first position. The method additionally includes at the deployment location, moving the payload from the first position to a second position. The method further includes deploying the payload from the second position to a deployment position at the deployment location.

An assembly of vessel and turret is provided. The vessel comprises a moonpool and the turret is mounted in said moonpool for a rotation around a turret axis relative to the vessel. The turret comprises a chain table to which mooring lines are connected and through which risers are conveyed, and a turret table vertically spaced above the chain table and connected therewith by a connecting structure. The connecting structure comprises at least three vertically extending columns positioned such at angular intervals that radially outer sides of the columns are located in the vicinity of an outer circumference of the turret. The risers are conveyed through the chain table in such a way that riser sections above the chain table extend towards the turret table within an internal space of the columns.