Designed to give high output with fuel flexibility, low emissions, efficiency & reliability
The engine can be run on either natural gas, light fuel oil (LFO), or heavy fuel oil (HFO), and can smoothly switch between fuels whilst operating. It is designed to provide the same output regardless of the fuel.
The Wärtsilä 50DF engine operates on the lean-burn principle. Lean combustion enables a high compression ratio, which in turn increases engine efficiency, reduces peak temperatures, and therefore also reduces NOx emissions.
Both the gas admission and pilot fuel injection are electronically controlled. The engine functions are controlled by an advanced automation system that allows optimal running conditions to be set, independent of the ambient conditions or fuel type.
The technology enables the engine to be operated on either natural gas, light fuel oil (LFO), or heavy fuel oil (HFO), and switching between fuels can take place seamlessly during operation, without loss of power or speed. This ensures safety and continuous installation operability. The Wärtsilä 50DF engine is designed to have the same output regardless of the fuel used.
One of the reasons for the strong success of this particular engine over the alternatives is its superior propulsion efficiency. The clear environmental advantages that operating on gas allows, is another factor in the success of this technology. When operating in gas mode, the nitrogen oxide (NOx) emissions are at least 85 percent below those specified in the current IMO regulations, and CO2 emissions are some 25 percent less than those of a conventional marine engine running on diesel fuel. Additionally, the sulphur oxide (SOx) and particle emissions are negligible at almost zero percent.
Wärtsilä’s advanced dual-fuel technology was first launched in the early 1990s for use in land-based power plant applications. The first marine installation of the 50DF engine came a decade later.
The fitting of Wärtsilä 50DF engines onboard the first LNG Carriers in 2006 set a trend in the industry. Since that introduction, 65 percent of all new LNG Carriers have been fitted with Wärtsilä dual-fuel engines.
In addition to its success in the LNG Carrier market, the Wärtsilä 50DF engine is increasingly being considered by owners and operators throughout the shipping industry. For example, in the cruise and ferry sector, where it is often necessary to operate in Emission Control Areas (ECAs), there is growing awareness of the advantages of operating on gas.
Similarly, vessels serving the offshore oil and gas industry are increasingly being fitted with Wärtsilä dual-fuel engines. The need for flexibility, fuel efficiency, and compliance with stricter environmental regulations, are the drivers behind this trend.
|Wärtsilä 50DF||IMO Tier II|
|Cylinder bore||500 mm||Fuel specification:|
|Piston stroke||580 mm||Fuel oil||700 cSt/50oC|
|Cylinder output||950, 975 kW/cyl||7200 sR1/100 F|
|Speed||500, 514 rpm||ISO 8217, ISO-F-DMX, DMA & DMB|
|Mean effective pressure||20.0 bar||Natural gas||Methane number: 80|
|Piston speed||9.7, 9.9 m/s||LHV: min.28 MJ/NM3, 5.5 bar, BSEC 7110 kJ/kWh|
|Engine type||Engine kW (50Hz)||Gen. kW (50Hz)||Engine kW (60Hz)||Gen. kW (60Hz)|
|6L50DF||5 700||5 500||5 850||5 650|
|8L50DF||7 600||7 730||7 800||7 530|
|9L50DF||8 550||8 250||8 775||8 470|
|12V50DF||11 400||11 000||11 700||11 290|
|16V50DF||15 200||14 670||15 600||15 050|
|18V50DF||17 100||16 500||17 550||16 940|
|Generator output based on a generator efficiency of 96.50 %|
|Dimensions (mm) and weights (tonnes)|
|6L50DF||8 115||3 580||2 850||3 820||1 455||96|
|8L50DF||9 950||3 600||3 100||3 820||1 455||128|
|9L50DF||10 800||3 600||3 100||3 820||1 455||148|
|12V50DF||10 465||4 055||3 810||3 600||1 500||175|
|16V50DF||12 665||4 055||4 530||3 600||1 500||220|
|18V50DF||13 725||4 280||4 530||3 600||1 500||240|
A* - Total length of the engine when the turbocharger is located at the flywheel end.
A - Total length of the engine when the turbocharger is located at the free end.
B - Height from the crankshaft centreline to the highest point.
B* - Height from the crankshaft centreline to the highest point when the turbocharger is located at the flywheel end.
C - Total width of the engine.
C* - Total width of the engine when the turbocharger is located at the flywheel end.
D - Minimum height from the crankshaft centreline when removing a piston.
F - Distance from the crankshaft centreline to the bottom of the oil sump.
Dimensions and weights
- Dimensions are in millimetres and weights are in metric tonnes. Indicated values are for guidance only and are not binding.
- Cylinder configurations: L = in-line and V = v-form.
Specific fuel oil consumption
At ISO standard reference conditions
Lower calorific value of fuel 42 700 kJ/kg
Without engine driven pumps
At 85% load
ISO standard reference conditions
Total barometric pressure: 1.0 bar
Suction air temperature: 25 °C
Charge air, or scavenge air, cooling water temperature: 25 °C
Relative humidity: 30%
Wärtsilä engines are delivered with the UNIC embedded engine management system.
The UNIC system is designed to ensure extended lifetime for large marine diesel and gas engines operating in the toughest of conditions. Special attention has been paid to temperature- and vibration endurance throughout the design, while the highest priority has been given to operational reliability.
Key features of the UNIC system include the engine safety system, local monitoring, speed control with loadsharing, fuel injection- and timing control, knock detection, alarm signal acquisition, start/stop sequencing, load reduction request, system diagnostics, and a fieldbus interface as applicable for each engine configuration.
Thanks to the electronic control, the engine can be adapted to different operating conditions. Furthermore, the pre-tested configuration allows the engine or generating set to be made ready for operation with a minimum of commissioning and installation work.
Conditions for use
The 2D and 3D models and drawings downloaded (”Marine Solutions Drawings”) are for general guidance purposes only and should not be used for actual projects. Models and drawings for specific projects must be obtained from the appropriate Wärtsilä personnel as there may be deviations from the Downloadable Files.
File formats supported include DXF and PDF for 2D models and IGES, STEP, DXF, SAT and WRML for 3D models. A 2D DXF or PDF should always be used to support the 3D models. The Downloadable Files are subject to changes or improvements by Wärtsilä without notification so please check regularly for new and updated files at www.wartsila.com.
Wärtsilä takes no responsibility for and disclaims any liability for the contents of the Downloadable Files, including but not limited to omissions, errors, deficiencies, inaccuracies contained therein, and the use or misuse thereof. In no event, shall Wärtsilä be liable for any consequential, special, contingent, or incidental damages or injury, financial or otherwise, suffered by any party arising out of, connected with, or resulting from the use of the Downloadable Files or the information contained therein.
This website contains information, which is owned by or licensed to Wärtsilä. Wärtsilä shall retain all rights, including copyrights, relating to the information in the Downloadable Files. Reproduction or transmission to third parties is prohibited without prior written approval of Wärtsilä. Copyright © Wärtsilä.
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