A floating driller having a hull, a main deck, an upper cylindrical side section extending downwardly from the main deck, an upper frustoconical side section, a cylindrical neck section, a lower ellipsoidal section that extends from the cylindrical neck section, and a fin-shaped appendage secured to a lower and an outer portion of the exterior of a bottom surface. The upper frustoconical side section located below the upper cylindrical side section and maintained to be above the water line for a transport depth and partially below the water line for an operational depth of the floating driller.

A system can include at least one measuring device that captures and collects multiple two-dimensional images of a mooring line disposed in water. The system can also include a mooring line assessment system that includes a controller communicably coupled to the at least one measuring device. The controller can receive the two-dimensional images from the at least one measuring device. The controller can also generate a three-dimensional reconstruction of the mooring line based on the two-dimensional images. The controller can further present the three-dimensional reconstruction to a user. The two-dimensional images can be captured and the recommendation can be made while the mooring line is in situ.

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.

There is disclosed an apparatus for mooring a structure, the apparatus includes a first portion for receiving a portion of a line, such as a mooring line, extending from a structure. A guide portion for guiding a/the portion of a line received by the first portion, the guide portion being movably connected to the first portion and a second portion for connecting or coupling the apparatus to a seabed or a further structure located thereon, the second portion being movably connected to the first portion and/or guide portion.

A method of assembling a floating wind turbine platform includes forming a base assembly of the floating wind turbine platform in either a cofferdam or a graving dock built in water having a first depth. The base assembly includes a keystone and a plurality of buoyant bottom beams extending radially outward of the keystone, wherein longitudinal axes of each of the plurality of bottom beams are coplanar. The cofferdam or the graving dock is flooded and the assembled base assembly is floated to an assembly area in water having a second depth. A center column and a plurality of outer columns are assembled or formed on the base assembly, a tower is assembled or formed on the center column, and a wind turbine is assembled on the tower, thereby defining the floating wind turbine platform.

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 offshore structure is separated into an upper structure and a lower structure. Part or whole of the lower structure is kept in an upright standing state in water. The upper structure is moved to above the lower structure kept in the upright standing state. A uniting step includes one or both of raising the lower structure to arrange the lower structure on a lower side of the upper structure and lowering the upper structure to arrange the upper structure on an upper side of the lower structure by submerging part of a carrier vessel on which the upper structure is mounted while being held by a pair of arm-shaped structures of the carrier vessel and integrating the lower structure with the upper structure. In this way, an offshore structure is moored safely at an offshore installation site without using a crane vessel.

The invention relates to floating platform mooring and involves an improved platform mounted tendon tension monitoring system with porch-mounted variable reluctance measurement technology sensors configured. The variable reluctance measurement technology sensors of this system are optimized for porch mounting. The porch-mounted tendon tension monitoring system can also be configured such that the porch-mounted optimized variable reluctance measurement technology sensors are replaceable. Sensors may be replaced to extend the desired useful lifetime of a tendon tension monitoring system or in the event that a sensor happens to malfunction. A plurality of variable reluctance measurement technology sensors can be configured in sensor packs at the corners or at other locations where tendon tension monitoring can be useful for a floating platform.

A system includes mooring lines arranged respectively in three to eight directions, and at least one of a plurality of offshore structures included in the offshore structure group is moored by locking the mooring lines in the respective directions with separate mooring bases, and at least one of the mooring bases locks the mooring lines which are connected respectively to three to eight of the offshore structures in the offshore structure group. With this configuration, even when part of the mooring lines mooring the offshore structures is broken or the mooring function of the mooring bases is lost, although the offshore structure moves, the offshore structure is kept being moored by the remaining mooring-line group, so that the offshore structure can be prevented from colliding with another offshore structure.

A method of assembling a floating wind turbine platform includes assembling a keystone having a hollow central cavity from pre-formed concrete sections, and assembling a plurality of buoyant bottom beams from pre-formed concrete sections. Each bottom beam is attached to, and extends radially outward of the keystone to define a base assembly. Each buoyant bottom beam includes a ballast chamber therein. The keystone is post-tensioned to each bottom beam along a longitudinal axis thereof. A center column is assembled upwardly and perpendicularly on the base assembly from pre-formed sections of the center column, the outer columns are assembled on a distal end of each bottom beam from pre-formed sections of the outer columns, and the center column and the outer columns are longitudinally post-tensioned to the base assembly. A tower is assembled on the center column from pre-formed sections, and a wind turbine is assembled on the tower.