Abstract: A hull structure for a semi-submersible wind power turbine platform and a method for loading a set of such hull structures onto a semi-submersible cargo carrying marine vessel. The hull structure includes first, second and third buoyant stabilizing columns extending in a substantially vertical direction; and first and second elongated submersible buoyant pontoon structures extending in a substantially horizontal direction. The hull structure generally has a V-shape in the horizontal plane with the first and second pontoon structures forming legs in the V-shape and with the second column located where the legs meet.

Abstract: A moored floating offshore wind semi-submersible platform with at least three columns characterized in that columns are supported on a T-shaped underwater hull made up of two elongated pontoons, where one pontoon is perpendicular to the other pontoon and a method that allow that the semi-submersible platform is constructed in hull-assemblies and blocks at a first location, transported efficiently to a second location close to the final offshore location where the hull-assemblies and blocks may be assembled quay-side while floating in the water. The platform will support at least one wind turbine on a supporting structure (tower) but may also support two turbines and in the latter case the platform will be moored offshore with a mooring turret to allow the platform to align in a favourable direction to the wind.

Abstract: A subsea equipment operations arrangement for an offshore platform or vessel includes a working deck with an opening to allow passage of subsea operation equipment to and from a position below the working deck, a lifting structure positioned above the opening to lift and handle heavy subsea operation equipment through the opening, and a system for transporting the heavy equipment laterally over the working deck to and from the opening. The system includes a rail structure on the working deck that supports and guides a movable carrier configured to carry the heavy equipment. The opening extends in a lateral direction from a lifting position below the lifting structure to a point aside the lifting position. A first deck section is movably arranged in the opening, covers a portion of the opening, and includes rail members.

Abstract: A semi-submersible offshore platform comprises a main structure comprising two longitudinal lower side beam structures, two transverse lower side beam structures and four columns, the longitudinal and transverse lower side beam structures are located between the four columns connecting the four columns with each other such that the semi-submersible offshore platform exhibits a frame shaped submersible pontoon having a lower central opening the four columns extends upwards from the frame shaped submersible pontoon. The main structure of the semi-submersible offshore platform comprises two longitudinal upper side beam structures and two transverse upper side beam structures, the longitudinal and transverse upper side beam structures are located between the four columns connecting the four columns with each other such that the semi-submersible offshore platform exhibits a frame shaped deck box structure having an upper central opening for receiving at least one structural module.

Abstract: A semi-submersible offshore platform comprises a main structure comprising two longitudinal lower side beam structures, two transverse lower side beam structures and four columns, the longitudinal and transverse lower side beam structures are located between the four columns connecting the four columns with each other such that the semi-submersible offshore platform exhibits a frame shaped submersible pontoon having a lower central opening the four columns extends upwards from the frame shaped submersible pontoon. The main structure of the semi-submersible offshore platform comprises two longitudinal upper side beam structures and two transverse upper side beam structures, the longitudinal and transverse upper side beam structures are to located between the four columns connecting the four columns with each other such that the semi-submersible offshore platform exhibits a frame shaped deck box structure having an upper central opening for receiving at least one structural module.

Abstract: A drilling derrick (1) for offshore drilling operations arranged to be a protecting enclosure (3) accommodating a drill pipe device adapted to perform drilling operations and allowing a pipe section to be moved to and from the drilling derrick (1), the drilling derrick (1) accommodating a pipe racking structure for stacking and retaining pipe sections for use in drilling operations, the drilling derrick (1) is adapted to be mounted on a deck (2). The drilling derrick (1) comprising a stressed-skin structure having external load carrying panels (3). The invention also relates to an offshore platform comprising at least one drilling derrick (1).