Advanced dual-fuel technology & efficiency, also used for generating set applications
Moreover, the engine can switch smoothly between fuels whilst operating. The Wärtsilä 34DF is manufactured in configurations of from 6L up to 16V giving 480/500 kW per cylinder and a total maximum mechanical output of 8000 kW. The engine speed is 720 or 750 rpm for use with 50 or 60 Hz applications.
The Wärtsilä 34DF engine is fully compliant with the IMO Tier II exhaust emissions regulations set out in Annex VI of the MARPOL 73/78 convention.
|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 7330 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%
|Technical data 50 Hz/750 rpm||6L34DF||9L34DF||16V34DF||20V34DF|
|8303 (8214)*||8048 (8146)*||8031 (8130)*|
|Electrical efficiency||%||43,1 (43,6)*||43,4 (43,8)*||44,7 (44,2)*||44,8 (44,3)*|
|Technical data 60 Hz/720 rpm|
|Heat rate||kJ/kWh||8347 (8437)*||8303 (8175)*||8048 (8107)*||8031 (8090)*|
|Electrical efficiency||%||43,1 (42,7)*||43,4 (44,0)*||44,7 (44,4)*||44,8 (44,5)*|
|Dimensions and dry weight of generating sets|
|Heat rate and electrical efficiency at generator terminals, including engine driven pumps, ISO 3046 conditions and gas LHV > 28 MJ/m3N. Tolerance 5%. Power factor 0.8. Gas Methane Number > 80. Nm3 defined at NTP (273.15 K and 101.3 kPa). *In liquid fuel mode.|
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.
Designed by Wärtsilä Ship Design and delivered in 2012, this PSV is powered by natural gas. The scope of supply includes Low Loss Concept, two Wärtsilä 34DF and two Wärtsilä 20DF. (photo: H. Valderhaug) »
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