Shimizu Corp. selected GustoMSC to develop the large-capacity WTIV following a competitive bidding process in 2019. After extensive evaluations of the installation challenges offshore Japan, which include seasonal typhoons, earthquakes, and tsunamis, we proposed the GustoMSC™ SC-14000XL tailored jack-up design with a large telescopic crane.
The WTIV design is specifically tailored to Shimizu's requirements. The vessel is 142 m long, 50 m wide, and can accommodate up to 130 personnel. It is also equipped with the proven GustoMSC variable speed rack and pinion jacking system, providing great reliability, safety, and performance in even the harshest offshore conditions.
We also delivered the world's first fully integrated offshore telescopic leg encircling crane, which enables the vessel to install foundations and turbines. When deployed in a retracted mode, the crane has a safe working load of 2,500 tons with a lifting height of 118 m above the deck. Keeping the crane boom in the retracted mode without an extension over the bow avoids sailing and maneuvering restrictions during transit and in port areas.
The crane can then easily transition to an extended mode to install turbines at a height of up to 158 m above the deck and with a maximum safe working load of 1,250 tons. This innovation results in a state-of-the-art, competitive product for Shimizu's large offshore wind turbine projects.
Our design proposal included several animations of the WTIV in action and a 1:20 scale model to demonstrate the functionality of the crane's telescopic boom. Satisfied with the proposal, Shimizu approved the development of the Blue Wind vessel.
Staying on schedule despite a pandemic
We quickly went to work on developing detailed design specs for the integrated vessel and crane in close collaboration with the JMU shipyard. While our team had worked with JMU on previous projects, most of Shimizu Corp.'s approved Japanese vendors for power, propellers, and other services were new to us. All parties involved succeeded in creating successful working relationships during the challenging COVID pandemic.
Despite travel restrictions, NOV's global presence helped keep the project on track. Our team designed, built, and delivered the first offshore telescopic leg crane to the JMU shipyard on time and on budget.
