The Wärtsilä 46DF is a four-stroke dual-fuel engine that can be run on natural gas, heavy fuel oil (HFO) or marine diesel oil (MDO).
The engine can smoothly switch from gas fuel to HFO/MDO operation and vice versa without loss of power or speed. The Wärtsilä 46DF design is based on the well proven and reliable Wärtsilä 46F and Wärtsilä 50DF engine families, which have operated successfully on the market since the early 2000s. Both engines have an outstanding track record, with more than 800 engines in operation and over 11 million running hours experience using Wärtsilä’s leading DF technology.
The Wärtsilä 46DF has extended Wärtsilä’s dual-fuel engine family by covering the power range from 6.2 MW to 18.3 MW at 600 rpm.
Wärtsilä’s proven dual-fuel technology enables owners and operators to choose both gas and liquid fuel, and switch between the two according to cost, availability, and local environmental regulations.
The switch between fuel types is made without loss of power or speed. The engine automation adapts automatically to the relevant fuel selection, both in normal and emergency modes.
In gas mode, the natural gas is fed to the engine at low pressure. This facilitates a simpler and space-saving engine room configuration while providing easier and faster maintenance activities.
The engine’s gas piping is double-walled as standard, and the advanced integrated automation system enables enhanced safety and local monitoring. This leads to safer and more reliable operations, under all conditions. The complete built-in automation minimizes the need for external controls, thus saving engine control room space.
The Wärtsilä 46DF is designed for a broad range of marine applications. Thanks to its fuel flexibility and modular, compact design, the engine can be optimized for constant-speed diesel-electric operation. It also meets the need for direct drive main engine propulsion, operating at either constant speed or along a combinator curve. The multi-fuel operation capability offers new machinery opportunities for various vessel applications.
The technology group Wärtsilä will supply the engines and fuel gas supply systems for two new Ro-Pax ferries. The vessels are being built at the Rauma Marine Constructions (RMC) yard in Finland for TT-Line Company Pty Ltd, a renowned Australian ferry fleet owner and operator. The order with Wärtsilä was placed in June 2021.
TT-Line currently operates two ferries, Spirit of Tasmania I and Spirit of Tasmania II, both of which operate with Wärtsilä engines, on the route between Melbourne, Victoria and Devonport, Tasmania. This fleet is now being renewed by the building of two new 212 metre long vessels, which will adopt the latest technology and be powered with LNG fuel to lessen the environmental impact.
“Since 2002 when the current vessels were inducted into our fleet, the Wärtsilä engines have delivered both performance and reliability backed by strong service and technical support. Keeping in mind the IMO’s stringent emission targets for the future, TT Line has opted for LNG fuelled ferries. Wärtsilä’s depth of experience and broad portfolio of LNG-fuel solutions for marine applications were prime considerations for us,” says Bernard Dwyer, Chief Executive Officer of TT-Line.
“We have worked closely with TT-Line for a number of years and are pleased and proud to continue this long-standing relationship via this latest newbuild project. We shall extend our best technical and operational support to TT-Lines’ new ferries. Wärtsilä has played a major role in enabling LNG to become a viable and increasingly popular marine fuel, and its adoption by global operators continues to grow. This order is a clear reflection of that trend,” says Mikko Mannerkorpi, General Manager, Sales, Wärtsilä Marine Power.
“Our goal is to be a pioneer in environmentally sustainable technology in shipbuilding, and we want to provide vessels to our customers accordingly. The LNG-powered engines play an important part in building two new eco-efficient and future-proof vessels for TT-Line,” says Jyrki Heinimaa, President & CEO of Rauma Marine Constructions.
The scope of supply includes, for each ship, four Wärtsilä 46DF dual-fuel main engines, three Wärtsilä 20DF dual-fuel auxiliary engines, and two Wärtsilä LNGPac fuel storage, supply, and control systems. The engines are future-proofed to operate on alternative green fuels as and when the availability evolves.
The new ferries will have a capacity of 1800 passengers and approximately 2500 lane metres on two freight decks. The first vessel is scheduled for delivery by the end of 2023, with the second one due a year later.
Media contact for more information on this release:
Ms Marit Holmlund-Sund
General Manager, Marketing Communications
Wärtsilä Marine Power
Mobile +358 (0)40 538 3519
The new TT-Line ferries will be powered by Wärtsilä engines fuelled by LNG. Wärtsilä will also supply its LNGPac fuel storage, supply and control system. Designed by Rauma Marine Constructions Oy. © Rauma Marine Constructions Oy.
Wärtsilä Marine Power in brief
Wärtsilä Marine Power leads the industry in its journey towards a decarbonised and sustainable future. Our portfolio of engines, propulsion systems, hybrid technology, and integrated powertrain systems deliver the reliability, safety, and environmental performance that Wärtsilä’s Smart Marine vision encompasses. We offer our customers performance-based agreements, lifecycle solutions, and an unrivalled global network of maritime expertise.
Wärtsilä in brief:
Wärtsilä is a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation, total efficiency and data analytics, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers. In 2020, Wärtsilä's net sales totalled EUR 4.6 billion with approximately 18,000 employees. The company has operations in over 200 locations in more than 70 countries around the world. Wärtsilä is listed on Nasdaq Helsinki.
Rauma Marine Constructions in brief:
Rauma Marine Constructions (RMC) is one of the leading shipbuilding companies in Europe. RMC was formed in the summer of 2014 in Rauma and is wholly Finnish-owned. RMC specialises in building and servicing multipurpose icebreakers, car and passenger ferries and naval vessels. More information is available at www.rmcfinland.fi
TT-Line in brief:
TT-Line operates Spirit of Tasmania - one of Australia’s most iconic travel experiences, and a vital connection between mainland Australia and the island state of Tasmania. Twin ships, Spirit of Tasmania I and Spirit of Tasmania II, operate overnight sailings across Bass Strait between Melbourne, Victoria and Devonport, Tasmania. Transporting more than 450,000 passengers annually, Spirit of Tasmania is widely recognised for its contribution to the Australian tourism industry and for fostering Australia’s economic development through the provision of a world-class passenger and freight service. Since its inception, Spirit of Tasmania has continued to grow steadily through its commitment to safety, reliability and in delivering unparalleled level of customer service.