The WTIV is a semi-submersible crane vessel, equipped with two heave compensated cranes of 2500 T lifting capacity each, totally 5000 T in tandem lift.
The vessel will have accommodation for 140 POB in single cabins and a helideck for a type S92 helicopter.
The vessel will have one of the lowest emission profiles in the industry, being equipped with the latest technology in dual fuel combustion engines, designed to run on ammonia (NH3), as well as available biofuels.
The vessel will also be equipped with the latest electric battery and energy recovery systems.
The wind turbine components (tower sections, nacelle and blades) will normally be transported by feeder vessel from shore to the offshore site and lifted onboard the WTIV by use of the heave compensated cranes. Upper tower sections can be transported in a horizontal position and lifted onboard by use of the tandem cranes on the WTIV.
The large deck of the WTIV can carry, e.g. : 4 complete sets of components for 15 MW wind turbine generators.
The wind turbine generator will be fully assembled on the deck of the WTIV and thereafter installed on top of the floating- or bottom-fixed substructure in one piece by a tandem lift.
The WTIV can work either in a semi-submerged mode for installation of floating wind turbine generators offshore, or in a semi-submerged mode with the four legs deployed to the seabed for installation of bottom-fixed wind turbine generators.
The vessel will in floating condition be running in DP3 mode for station keeping. An innovative 3D compensation system will be used for final positioning of fully assembled wind turbine generators from the deck of the WTIV to the floating substructures at offshore location.
In the semi-submerged partly bottom supported mode, the weight of the vessel and cargo are mainly carried by the displacement of the WTIV, with legs at the corners of the vessel that will be deployed on the seabed to eliminate wave induced motions.
