A buoyant tension leg platform arranged to support a renewable energy capturing device when the platform is submerged in a body of water. The platform has at least three vertices or lateral extents, at least three of the vertices or lateral extents have a mooring arrangement. The mooring arrangement includes a first mooring line extending between the vertex or lateral extent and a first anchor point in communication with a bed of the body of water. The first mooring line extends at an angle relative to the bed and a second mooring line extending from the vertex or lateral extent to a second anchor point. The second mooring line extends at an angle relative to the bed, such that the mooring arrangement of the corresponding vertex or lateral extent defines a triangle.

A buoyant offshore platform for supporting a renewable energy system having a base portion for submerging below the surface of a body of water, a top portion, at least one mooring line for fixing the platform to a bed of the body of water, and a tensioning means for applying tension to at least one of the mooring lines. The platform further comprises a floating configuration in which the platform is positioned floating on the surface of the body of water. The platform has a deployed configuration in which the base portion is submerged and the top portion remains above the surface of the body of water. In use, the tensioning means is arranged to apply tension to the at least one mooring line fixed between the platform and the bed such that the buoyant offshore platform transitions between the floating configuration and the deployed configuration.

A method for installing a TLP based floating object at anchor points. The floating object includes a central body and buoyancy assemblies positioned around the central body in a horizontal plane, with each buoyancy assembly connected to the central body and connectable to one of the anchor points. The method includes: attaching a mooring leg including a mooring line at each anchor point; for each anchor point connecting a pull-down line between the buoyancy assembly and the anchor point; tensioning the pull-down lines so the floating object is lowered to an installation level below an operational level; for each anchor point connecting the mooring leg with the buoyancy assembly in slack mode; and after connecting the mooring lines with the buoyancy assemblies, paying out the pull-down lines so the floating object rises upward from the installation level to the operational level where the mooring legs are tensioned.

A subsea assembly comprising; a foundation, a support device; and a subsea equipment adapter frame is provided. The foundation, support device and subsea equipment adapter frame are separate modular components that can be installed separately. The foundation may be a suction anchor. A method of installing and uninstalling the subsea assembly is also provided.

A riser tensioner bearing is provided. The riser tensioner bearing is an asymmetric bearing having an outer member comprising a cylindrical outer profile and an at least partially spherical interior profile, and an inner member comprising an at least partially spherical outer profile and a substantially cylindrical outer profile.

Embodiments disclosed herein describe cylindrical structures with indents configured to reduce vortex induced vibrations (VIV). For example, the cylindrical structures may be configured to reduce VIV for risers subject to ocean currents.

A connector adapted for release under load from a complementary connector. The connector having a locking element for engagement with the complementary connector to lock the complementary connector to the connector; and a locking member moveable from a locked position to an unlocked position. The locking member operative to permit the/each locking element to lock the complementary connector to the connector when in the locked position and operative to allow the/each locking element to release the complementary connector when in the unlocked position. The locking member and locking element arranged such that when the connector is locked to the complementary connector and the locking member is in a partially unlocked position, a load applied to the/each locking element causes the/each locking element to urge the locking member towards its fully unlocked position, thereby unlocking the complementary connector from the connector.

Disclosed is a mooring line connector assembly for connecting a mooring line to a floating structure, including: a tubular housing connectable to the floating structure, having a lower housing end and an upper housing end with an inner circumference; a connector body extending along a connector axis, having an upper connector body end and a lower connector body end connected to the mooring line; a guiding body rotatably arranged on the connector body to be freely rotatable around the connector body and the connector axis, including first rotation unit on an outer surface of the guiding body and a guiding part having an outer circumference at an upper guiding body end; and second rotation unit arranged on an inner surface of the tubular housing, arranged for engaging the first rotation unit.

The floating system is a single column tension leg platform for a floating offshore wind turbine (SCTLP). The single column tension leg platform comprises a central main vertical floating column, a buoyant base attached to and disposed below the central main vertical floating column, a station keeping system attached to the buoyant base, and an inter array cable riser system. The buoyant base is of one of a triangular shape and a circular shape.

An apparatus and methods for installation of an offshore platform for supporting equipment installations is provided. The apparatus includes a platform configured to support offshore equipment supported by a structure such as a modular column assembly. The modular column assembly can be comprised of main barrel joint bundles.