An installation arrangement with a barge and a jack-up rig which floats in a first position on the sea and has a hull which is slotted vertically from the surface of the sea and has a slot width which is greater than that of the barge so that the barge can move into a slot, wherein the jack-up rig has supporting legs which can move to and from along a height relative to the hull and can be set down on the seabed. The hull and the barge can be lifted along the support legs. The slot extends along the entire longitudinal extent of the barge over the entire height of the hull, and securing means are arranged on the barge and on the slot and said securing means interact and secure the barge in the raised position in a fixed position on the jack-up rig.

The offshore jack-up has a hull and a plurality of moveable legs engageable with the seafloor. The offshore jack-up is arranged to move the legs with respect to the hull to position the hull out of the water. The method comprises moving at least a portion of a vessel underneath the hull of the offshore jack-up or within a cut-out of the hull when the hull is positioned out of the water and the legs engage the seafloor. A stabilizing mechanism mounted on the jack-up is engaged against the vessel. The stabilizing mechanism is pushed down on the vessel to increase the buoyant force acting on the vessel.

A wax control element for subsea processing of well fluids in a wellstream comprises a bundle of flowlines within an elongate tensile structure. That structure defines inlet and outlet ends and has cooling and heating provisions that act on the flowlines, in use, to promote deposition of wax in the flowlines and subsequent entrainment of wax in the wellstream.

The present invention relates to a method for installing an offshore wind turbine at a target location at sea with an installation vessel, the vessel comprising:—a nacelle support structure for temporarily supporting a nacelle comprising a hub having a plurality of root end connectors to which the root ends of the blades are to be connected, the nacelle support structure comprising:—a support tower extending upwardly from a deck of the installation vessel,—a support platform configured to temporarily support the nacelle,—one or more lifting devices configured for:—lifting the nacelle onto the support platform,—lifting a nacelle assembly including the blades onto a wind turbine mast located adjacent the vessel, wherein the method comprises: a) lifting the nacelle onto the support platform, and securing the nacelle to the support platform, b) orienting a root end connector of the hub of the nacelle in a direction facing a guide path of the blade moving system, c) connecting the root end of the first blade to the corresponding first root end connector of the hub, d) repeating steps b) and c) for subsequent blades and root end connectors until all blades are connected to the hub of the nacelle, thereby providing a RNA, e) lifting the RNA from the nacelle support structure and positioning the RNA onto a wind turbine mast located adjacent the vessel.

A system and method for mating equipment offshore to a spar buoy secured to a foundation without the use of a crane barge. The system comprises a floating vessel having a pair of forks defining a slot. A gimbal table, defining an opening, is positioned within the slot and connected to the vessel and a locking collar is mounted to the gimbal table. A mating member is attached to the spar buoy. The vessel is maneuvered to bring the spar buoy within the gimbal table opening. With the spar buoy positioned within the gimbal table opening, the locking collar is arranged and designed to releasably attach to the mating member of the spar buoy and restrict relative vertical motion between the spar buoy and the vessel while the gimbal table allows the floating vessel to roll and pitch without driving these motions into the spar buoy.

The present invention relates to a vessel for transporting and installing a offshore wind power generator. The vessel for transporting and installing a offshore wind power generator according to an embodiment of the present invention includes: a support frame enabling a offshore wind power generator to lie moved perpendicularly to a vessel body through a vessel body opening portion formed at a tail of the vessel body; and a sliding deck being able to move horizontally with respect to the vessel body to open and close the vessel body opening portion.

The offshore jack-up has a hull and a plurality of moveable legs engageable with the seafloor. The offshore jack-up is arranged to move the legs with respect to the hull to position the hull out of the water. The method comprises securing the vessel with respect to the hull of the offshore jack-up when the hull is positioned out of the water and the legs engage the seafloor. A lifting mechanism mounted on the offshore jack-up engages with a cargo carrying platform positioned on the vessel. The platform is lifted with the lifting mechanism between a first position on the vessel and a second position clear of the vessel.

An offshore structure includes an adjustably buoyant hull including a plurality of vertical columns and a plurality of horizontal pontoons. Each pontoon extends between a pair of the columns. The adjustably buoyant hull is configured to receive a topside. Each column has a central axis, an upper end, and a lower end. Each pontoon has a longitudinal axis, a first end coupled to one of the columns, and a second end coupled to another one of the columns. The offshore structure also includes a foundation assembly attached to a lower end of the hull. The foundation assembly includes a column skirt extending downward from the lower end of each column and a pontoon skirt extending downward from a bottom surface of each pontoon.

A floatable structure is described having a hull and a deck. The floatable structure further includes a mooring system for mooring a second floating structure at a mooring position relative to the floatable structure. The mooring system brings the second floating structure down in the water from an initial floating draft to a larger mooring draft to reduce motions of the second floating structure relative to the floatable structure. A method for mooring a second floating structure using the mooring system is also described.

An offshore structure has an upending device for upending an elongate suppo structure from a substantially horizontal loading position on a deck of the offshore structure to a substantially vertical launch position outboard of the offshore structure. The upending device has a pivot axis situated near a side of the offshore structure for pivoting the upending device between the loading position and the launch position. A first end of the upending device has a connector member for pivotally connecting to the elongate support structure. The connector member in the launch position is in a position outboard from the side of the offshore structure. A second end of the upending device is attached to a pulling device that is located on the deck of the offshore structure. The upending device is within reach of one or more hoisting means for the elongate support structure.