According to the designer, the focus of the new design is on simplicity, efficiency, low fuel consumption, and a reduced environmental impact.
The equipment solutions are suitable for medium to large size AHTS vessels, where one of the key components is a two-speed gearbox system selected to meet the design targets of reduced costs and less complexity without compromising operational safety. Wärtsilä estimates that the new design provides a reduction of 20-25 percent in fuel consumption compared to conventional diesel mechanical four engine solutions. The exhaust emissions are reduced accordingly.
The hybrid two-speed gearbox Power Take In (PTI) solution ensures a seamless transfer from one operational mode to another, with the ability to work efficiently in all operational modes, Wärtsilä said. When changing propeller speeds, the arrangement produces no loss in Power Take Off (PTO) power. Crew requirements need not change to operate vessels featuring the new Wärtsilä design as no special electrical skills are necessary.
The new Wärtsilä series of AHTS designs features Bollard Pull options of 180 metric tons, with options for 150 or 220 metric tons, and a hybrid propulsion system with a two-speed gearbox. They are fully compliant with ABS and the latest SOLAS regulations.