Mitsubishi Heavy Industries has named a fifth gas carrier to rely on its unique hybrid arrangement of steam turbines and gas engines (STaGE) driving electric propulsion.
The 177,000m3 Marvel Crane is on sea trials before delivery to Mitsui & Co, which will deploy the vessel to serve the Cameron LNG Project in the US. It is the latest in Mitsubishi Heavy Industries’ (MHI) Sayaringo STaGE series of LNG carriers which began with the Diamond Gas Orchid last year.
The STaGE propulsion concept uses an asymmetrical configuration for twin shaftlines. The starboard line is driven by three Wärtsilä medium-speed, dual-fuel engines powering an electrical propulson motor. The port-side shaftline is driven by a steam turbine developed by MHI, the UST (ultra steam turbine plant), which uses waste heat from engine exhaust and cooling water. This means that very little fuel is required to power the turbine.
MHI public affairs spokesman Genki Ono told Marine Propulsion that the company is contractually prevented from disclosing the installed power of the vessel. On the starboard side, the Wärtsilä 6L50DF engines in diesel-electric applications each have an output of 5,700kWe at 500rpm and 5,850kWe at 514rpm.
The vessel, one of four remaining on order, also features a modified Moss spherical that is designed to expand the ship's capacity without increasing its width, allowing it to pass through the new Panama Canal.
MHI received the order for the new vessel through MI LNG Co, a joint venture for the design and sale of LNG carriers established by MHI and Imabari Shipbuilding.
The vessel is scheduled for delivery next month.