Wärtsilä 20DF

Contact us

Wärtsilä 20DF

The advantages of fuel flexibility in a small unit, also used for generating set applications

With the Wärtsilä 20DF, Wärtsilä is extending the benefits of dual fuel (DF) technology to cover the entire power range. The engine offers ship owners and operators a compact unit that brings all the advantages of fuel flexibility to auxiliary applications, such as generating sets or as the prime mover in smaller vessels.

Based on the well proven and reliable Wärtsilä 20 diesel engine introduced in the early 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.

Key benefits

  • Fuel flexibility
  • Application flexibility
  • Proven and reliable dual-fuel technology
  • Long overhaul intervals
  • Low exhaust gas emissions
  • Low gas feed pressure
  • Embedded automation system

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 20DF 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.

 

Applications

Installed alongside Wärtsilä 34DF, 46DF or 50DF main propulsion machinery, a Wärtsilä 20DF generating set completes the multi-fuel engine room concept. Compact and light, the Wärtsilä 20DF is intended for use in those vessel types where the Wärtsilä 20 is currently installed.

As well as being an ideal mechanical-drive prime mover in smaller applications, such as small cargo vessels, ferries or tug boats, it is also an excellent choice for harbour generating set applications in a wide range of vessel types.

Wärtsilä 20DF Product guide and 3D models and drawings

Get technical data and system proposals for designing W20DF marine engine installations.

References

  • Viking Supply

    Hybrid upgrade for Viking Supply Ships sharpens competitive edge of LNG-powered PSVs

  • Offshore construction vessel Orion

    The world’s first LNG fuelled offshore construction vessel being built for DEME will be powered by Wärtsilä.

    Orion reference
  • LNG vessel for Knutsen OAS Shipping

    The latest development of the LNG infrastructure provides clear evidence of the increasing importance of LNG fuel to the marine industry. Wärtsilä has a lot of experience and know-how throughout the LNG value chain, and we are confident that their solutions are what we need for this latest expansion to our fleet.

    LNG vessel for Knutsen OAS Shipping reference
  • Viking Prince

    The Viking Prince is a Wärtsilä VS 489 Gas PSV design and features excellent energy efficiency, a unique hull form, fuel flexibility, and outstanding vessel performance in areas such as fuel economy and cargo capacity.

    Viking Prince photo Harald Valderhaug

Press releases

Related products and services

Wärtsilä Marine. Let's connect.