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.