A system that includes a first winch assembly having a first structure on which a fuel hose is configured to be spooled and unspooled, the first structure having a first rotational axis. The system also includes a second winch assembly located rearward of the first winch assembly, the second winch assembly includes a second structure on which a messenger line is configured to be spooled and unspooled, the second structure having a second rotational axis and being rotatable between first and second rotational positions. Upon the second structure being in the first rotational position the second rotational axis is non-orthogonal to the first rotational axis. Upon the second structure being in the second rotational position, the second rotational axis is orthogonal to the first rotational axis. The second structure including an axial through opening through which the fuel line is configured to pass when the second structure is in the second rotational position.

A system that includes a first winch assembly having a first structure on which a fuel hose is configured to be spooled and unspooled, the first structure having a first rotational axis. The system also includes a second winch assembly located rearward of the first winch assembly, the second winch assembly includes a second structure on which a messenger line is configured to be spooled and unspooled, the second structure having a second rotational axis and being rotatable between first and second rotational positions. Upon the second structure being in the first rotational position the second rotational axis is non-orthogonal to the first rotational axis. Upon the second structure being in the second rotational position, the second rotational axis is orthogonal to the first rotational axis. The second structure including an axial through opening through which the fuel line is configured to pass when the second structure is in the second rotational position.

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.

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.

An offshore wind turbine blade and tower maintenance devices and systems, more particularly, to the system for service tools positioning relative to the offshore wind turbine blade and tower. An arrangement for lowering and raising service tools used for offshore wind turbine blade and tower maintenance, having: a truss system, a rigging and a rigging pulling in and letting out means. The truss system, includes booms, pivotally attached to a supporting means, which are adapted to be leaned against or releasably fixed to a wind turbine tower or wind turbine tower mooring elements; wherein the rigging and a rigging pulling in and letting out means are operably connected with the truss system, so to allow lowering and raising service tools used for offshore wind turbine blade and tower maintenance.

An offshore wind turbine blade and tower maintenance devices and systems, more particularly, to the system for service tools positioning relative to the offshore wind turbine blade and tower. An arrangement for lowering and raising service tools used for offshore wind turbine blade and tower maintenance, having: a truss system, a rigging and a rigging pulling in and letting out means. The truss system, includes booms, pivotally attached to a supporting means, which are adapted to be leaned against or releasably fixed to a wind turbine tower or wind turbine tower mooring elements; wherein the rigging and a rigging pulling in and letting out means are operably connected with the truss system, so to allow lowering and raising service tools used for offshore wind turbine blade and tower maintenance.

A walk-to-work system for allowing personnel and/or equipment to move between a vessel and a wind turbine includes a gangway system and an elevator system positioned with a radial offset from the gangway system. The gangway system includes a height adjustable elongated pedestal and a gangway. The height adjustable elongated pedestal has a first elongated pedestal end mountable onto a deck of the vessel. The height adjustable elongated pedestal includes a first pedestal part and a second pedestal part height adjustably coupled to the first pedestal part. The gangway is rotationally coupled to the height adjustable elongated pedestal at a height H.sub.g from the first elongated pedestal end such that the gangway is radially extending at a length L.sub.g from a center axis of the height adjustable elongated pedestal. The elevator system includes a height adjustable elongated elevator having a first elevator end mountable onto the deck of the vessel. The height adjustable elevator includes a static elevator part and a displaceable elevator part height adjustably coupled to the static elevator part. The elevator system includes a drive system, an elevator car, and a lifting device. The drive system is configured to displace the displaceable elevator part relative to the static elevator part along the elevator's height. The elevator car is movably connected to the height adjustable elevator. The elevator car is configured to be elevated up to the same height as the gangway for allowing access between the elevator system and the gangway system. The lifting device is configured to move the elevator car of the height adjustable elevator.

Disclosed is a method and apparatus for transferring a plurality of cargo units, each cargo unit having a cavity therein, providing a lifter suspended in free floating form by a crane, the lifter having a frame and at least one lifting arm which is detachably connected to the frame wherein the frame has at least one lifting connector for detachably connecting the lifter to the crane; moving the lifter to a position immediately adjacent the plurality of cargo units; causing each free end of the at least one lifting arm to penetrate at least one cavity of one of the plurality of cargo units; raising the at least one of the plurality of cargo units to an elevated position; moving the lifter and the at least one raised cargo unit to a second position laterally spaced from the original position wherein each free end of the at least one lifting arm is elevated compared to each second end of the at least one lifting arm; and depositing the raised cargo unit at the second position.

Disclosed is a method and apparatus for transferring a plurality of cargo units, each cargo unit having a cavity therein, providing a lifter suspended in free floating form by a crane, the lifter having a frame and at least one lifting arm which is detachably connected to the frame wherein the frame has at least one lifting connector for detachably connecting the lifter to the crane; moving the lifter to a position immediately adjacent the plurality of cargo units; causing each free end of the at least one lifting arm to penetrate at least one cavity of one of the plurality of cargo units; raising the at least one of the plurality of cargo units to an elevated position; moving the lifter and the at least one raised cargo unit to a second position laterally spaced from the original position wherein each free end of the at least one lifting arm is elevated compared to each second end of the at least one lifting arm; and depositing the raised cargo unit at the second position.

A control system for a suspension system of a multi-hulled vessel, the vessel including a chassis portion, at least two hulls moveable relative to the chassis portion. The suspension system of the vessel provides support of at least a portion of the chassis above the at least two hulls, and includes adjustable supports and at least one motor to enable adjustment of a support force and/or displacement of the adjustable supports. The control system includes a fender friction force input for receiving at least one signal indicative of a friction force on a fender portion between a fixed or floating object and the vessel chassis portion, and in response to the fender friction force input, the control system is to adjust the support force and/or displacement between the chassis portion and the at least two hulls to reduce or minimize the friction force on the fender portion.