Advanced dual-fuel technology & efficiency, also used for generating set applications
The Wärtsilä 34DF is manufactured in configurations of from 6L up to 16V giving 500 kW per cylinder and a total maximum mechanical output of 8000 kW. The engine speed is 750 rpm.
The Wärtsilä dual-fuel engine capability enables ships to be operated on either conventional liquid marine fuels or LNG. The switch between fuels can be made seamlessly without loss of power or speed. Such fuel flexibility enables compliance with emission regulations in controlled areas, while giving operators the option of determining the fuel according to cost and availability.
When operating in gas mode, the Wärtsilä 34DF engine is already compliant with IMO Tier III regulations without any secondary exhaust gas purification systems. Also when fuelled by gas, the SOx and CO2 emissions are notably reduced, and smokeless operation is attained.
In liquid fuel oil mode, the Wärtsilä dual-fuel engines are fully compliant with the IMO Tier II exhaust emissions regulations set out in Annex VI of the MARPOL 73/78 convention. The engine is able to operate efficiently and economically on low sulphur fuels (<0.1% S), making it suitable for operation in emission-controlled areas.
|The newly obtained certification of emission standard compliance from the United States Environmental Protection Agency (EPA) for the Wärtsilä 34DF further endorses the environmental compliance of this engine.|
|Wärtsilä 34DF||IMO Tier II|
|Cylinder bore||340 mm||Fuel specification:|
|Piston stroke||400 mm||Fuel oil||700 cSt/50oC|
|Cylinder output||500 kW/cyl||7200 sR1/100 F|
|Speed||750 rpm||ISO 8217, ISO-F-DMX, DMA & DMB|
|Mean effective pressure||22.0 bar||Natural gas||Methane number: 80|
|Piston speed||10.0 m/s||LHV: min.28 MJ/NM3, 5.5 bar, BSEC 7280 kJ/kWh|
|Dimensions (mm) and weights (tonnes)|
|6L34DF||5 280||2 550||2 385||2 345||1 155||34|
|9L34DF||6 750||2 550||2 385||2 345||1 155||47|
|12V34DF||6 615||2 665||3 020||2 120||1 475||59|
|16V34DF||7 735||2 430||3 020||2 120||1 475||75|
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.
The use of natural gas is already strong and will continue to increase. Wärtsilä's extensive expertise across the entire LNG value chain enables it to bundle together solutions that provide efficient energy production from gas. »