Abstract: A stability frame for the installation of a wind turbine on an offshore substructure, wherein the wind turbine comprises a tower configured to be anchored to a rigging assembly below the barycenter of the wind turbine, has a main body configured to be mounted about the upper part of the tower; and a plurality of guides, which extend outwardly from the main body and are configured for constraining parts of the rigging assembly so as to laterally support the wind turbine by the rigging assembly.

Abstract: A system for levelling and gripping a jacket leg into a hollow foundation pile has a levelling assembly for adjusting the longitudinal axis of a jacket leg partially inserted in a hollow foundation pile with an actuation group arranged about the jacket leg and configured to exert a force parallel to the longitudinal axis between the upper edge of the hollow foundation pile and the jacket leg and selectively attachable to the jacket leg and recoverable for further use in another levelling assembly; and a gripping assembly for locking the jacket leg in a designated position with respect to the hollow foundation pile once leveled.

Abstract: An assembly for lifting a payload of an offshore platform is provided. The offshore platform includes a support structure supporting the payload. The payload includes a main deck and a column directly connected to the support structure, the column supporting the main deck. The assembly includes a lower lifting device, having a welding surface weldable to a welding portion of the column and an upper lifting device having a coupling interface adapted to couple to a coupling portion of the payload and a plurality of tension rods, connecting the lower lifting device and the upper lifting device. At least some tension rods of the plurality of tension rods extend for a rod length along a rod direction (X-X) between the lower lifting device and the upper lifting device. At least some tension rods of the plurality of tension rods are pre-tensioned to exert a compressive action to the payload.

Abstract: A stability frame for the installation of a wind turbine on an offshore substructure, wherein the wind turbine comprises a tower configured to be anchored to a rigging assembly below the barycenter of the wind turbine, has a main body configured to be mounted about the upper part of the tower; and a plurality of guides, which extend outwardly from the main body and are configured for constraining parts of the rigging assembly so as to laterally support the wind turbine by the rigging assembly.

Abstract: A pipe structure suitable for being laid in the sea comprises an inner pipe (2) for conveying fluid to be transported along the pipe structure and an outer pipe (3) around the inner pipe and supporting the inner pipe with space between the inner and outer pipes, the outer pipe having openings to allow water first to flow into the space between the inner pipe and the outer pipe and then to flow out of the space.

Abstract: A vessel (2) comprises a first stabilizer assembly (14) and a second stabilizer assembly, each stabilizer assembly comprising at least one submergible at least partially hollow body; and suspending means (16) for suspending the or each body from the vessel, the first and second stabilizer assemblies being suspended from substantially opposite sides of the vessel. Fins (22) are provided on the stabilizer assembly.

Abstract: A pipe structure suitable for being laid in the sea comprises an inner pipe (2) for conveying fluid to be transported along the pipe structure and an outer pipe (3) around the inner pipe and supporting the inner pipe with space between the inner and outer pipes, the outer pipe having openings to allow water first to flow into the space between the inner pipe and the outer pipe and then to flow out of the space.

Abstract: A method of removing a deck from an offshore structure is provided. An apparatus for carrying out the method is also described.

Abstract: A method of removing a deck from an offshore structure (11) including a deck (13) supported on a jacket (12), includes the following steps: a) positioning a floating vessel (10) around the jacket with respective parts of the vessel on opposite sides of the jacket (12) and trusses (3, 4) extending between the opposite parts of the vessel, b) engaging parts of the trusses (3, 4) with legs (15) of the jacket, c) securing the trusses (3, 4) to the jacket (12), d) relieving the load carried by portions of the legs (15) of the jacket (12), e) cutting through the portions of the legs (15) of the jacket to divide the jacket into a lower part and an upper part carrying the deck, the trusses (3, 4) being secured to the upper part of the jacket (12), f) transferring the weight of the upper part of the jacket (12) and of the deck (13) via the trusses (3, 4) to the floating vessel (10), and g) removing the floating vessel (10), with the trusses (3, 4), the upper part of the jacket (12) and the deck (13) supported thereon,