Wärtsilä 34DF

Advanced dual-fuel technology & efficiency, used for both main engine and generating set applications

The Wärtsilä 34DF is manufactured in configurations from 6L to 16V, giving 500 kW per cylinder and a total maximum mechanical output of 8000 kW. The engine speed is 750 rpm.

Based on the well proven and reliable Wärtsilä 32 diesel engine introduced in the mid-1990s, fuel flexibility means the engine can be optimized for constant speed generating sets, as well as variable speed mechanical drives, for main engine applications.

    Advantages

    Fuel flexibility

    The Wärtsilä dual fuel engine capability enables ships to be operated on either conventional liquid marine fuels (LFO, HFO or liquid bio fuel) 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 Wärtsilä 34DF has also obtained certification of emission standard compliance from the United States Environmental Protection Agency (EPA), which further endorses the environmental compliance of this engine.

    Technical data
    Wärtsilä 34DF IMO Tier III, EPA T2/T3
    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
    Mean effective pressure 22.0 bar ISO-F-DMX, DMA & DMB
    Piston speed 10.0 m/s BSEC 7280 kJ/kWh at ISO cond.
    Dimensions (mm) and weights (tonnes)
    Engine type A B C D F Weight
    6L34DF 5 325 2550 2380 2 345 1 155 35
    8L34DF 5 960 2 550 2 610 2 345 1 155 44
    9L34DF 6 870 2 550 2 610 2 345 1 155 49
    12V34DF 6 865 2 435 2 900 2 120 1 210 61
    16V34DF 7 905 2 570 3 325 2 120 1 210 77

    34df

    Rated power
    Engine type kW
    6L34DF 3 000
    8L34DF 4 000
    9L34DF 4 500
    12V34DF 6 000
    16V34DF 8 000
    Applications

    The Wärtsilä 34DF is the ideal choice for main power source in a vast range of applications, for instance offshore support vessels and platforms, small LNG carriers, ferries & tugs.

    Besides serving as mechanical-drive or diesel/gas-electric main engine, the Wärtsilä 34DF is also a perfect fit as auxiliary generating set installed alongside Wärtsilä 46DF or 50DF main propulsion machinery. Thus completing the multi-fuel engine room concept.

    Related references

    Press releases

    Articles

    17 May 2013
    • In Detail article

    The Wärtsilä Gas Valve Unit Enclosed Design (GVU-ED™) for marine applications

    Wärtsilä’s dual-fuel engine technology is...
    1 October 2013
    • Twentyfour7. article

    Pushing LNG Technology Boundaries

    Since 2003 Wärtsilä has led the way in LNG-powered offshore support vessels.
    4 March 2014
    • Twentyfour7. article

    A more powerful, more efficient Wärtsilä 34DF

    Following its successful introduction several years ago, Wärtsilä’s 34DF dual-fuel engine has now been...