Waterjets For High-Speed Ferry

Wärtsilä has been contracted to supply four of its waterjets plus the hydraulics and control system for a new 109-m long high-speed RoPax ferry.The ship is being built at the Austal Ships Pty yard in Australia for Molslinjen A/S of Denmark. The order with Wärtsilä was booked in May 2017.
Wärtsilä’s said its compact axial flow jet solution was considered the most appropriate choice for this vessel, since it offered the customer optimal weight and performance criteria for the ship’s mission profile.
“This is a prestigious newbuild project and we are proud that our waterjets have been selected to drive this high-speed ferry. The proven design and reliable performance of the Wärtsilä solution were deciding factors in the winning of this contract,” said Arto Lehtinen, vice president, Propulsion, Wärtsilä Marine Solutions.
“We have worked successfully with Wärtsilä for a number of years on many naval and commercial projects. We know and trust the quality and performance of their products and we find Wärtsilä to be a valued, reliable partner for us,” said Penelope Patterson, head of Supply Chain, Austal Ships Pty.
The new vessel will be an all aluminium catamaran having a top speed of 40 knots. It will be equipped with two full vehicle decks for 425 cars, or 610 lane metres for trucks and up to 232 cars. The ship will be able to carry more than 1000 passengers. When delivered, the contracted route for the vessel is the crossing of the Kattegat between Aarhus and Odden.
The ship is scheduled for delivery during the fourth quarter of 2018, and the Wärtsilä equipment will be delivered to the yard in May 2018.
Wärtsilä’s axial pump components are made of stainless steel to prevent wear and corrosion, while the water lubricated bearing in the stator bowl provides an environmentally friendly solution, the company said.The inlet design is tailored to the outline and operational profile of each individual vessel.
The pre-assembled waterjets consist of a skid, with an integrated inlet duct, that is designed to allow for installation directly onto the ship’s hull. All auxiliary systems, such as the hydraulics and coolers, are pre-mounted on the assembly and the piping connections are installed. These units are available in five sizes up to approximately 4500 kW. For the large waterjets, the design of the inlet duct is optimized to fit the specific vessel requirements. Because of its size, the waterjet inlet is part of the ship construction. The company’s design capability for these larger waterjets includes units of up to 50 MW.

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