Heavy-lift crane vessel (HLCV) Stella Synergy, set for delivery in Q1 2020, has clearly been designed with stability in mind.
The unmistakeable X-BOW hull design belies the identity of the vessel’s designer, Ulstein Design and Solutions. This hullform allows for a more consistent transit speed and improves workability in severe weather conditions. At 185 m long and with a breadth of 36 m and width of 12.6 m, it is the largest vessel in the world to feature the X-BOW design. With a dynamic positioning rating of DP2, the vessel will be capable of keeping station in rough seas.
Huisman Equipment has been appointed to design and construct two offshore mast cranes for the vessel. The main crane will have a 2,500-tonne capacity, a triple hoist, which allows for complex upending operations, and an active heave compensation auxiliary block of 600 tonnes, with a depth rating of 3,000 m. The second subsea crane will have a 400-tonne capacity, with an active heave compensated main hoist allowing control of the position of a load relative to the seabed. This crane also has a depth rating of 3,000 m and will be equipped with a man-riding whip hoist.
Stella Synergy was designed to combine economic and technical efficiency with high quality and safety. Environmental considerations were factored in to the vessel’s design and it will be powered by dual-fuel engines, with the ability to operate on LNG.
In terms of propulsion, it will also be fitted with two stern-mounted main thrusters, two tunnel thrusters and one retractable azimuth thruster. It will have a transit speed of 14 knots and installed power of 22 MW.
Other design features include a dual ROV hangar, a 22 m-diameter carousel hold, a 7 m x 7 m moonpool, accommodation for 150 persons and a Sikorsky S-92A helideck.