Wärtsilä LNGPac

Wärtsilä LNGPac™ is a complete fuel gas handling system for LNG fuelled ships and includes the bunkering station, LNG tank and related process equipment as well as the control and monitoring system.

The LNG fuel system can be offered as a standalone product, as well as a part of a complete propulsion system. Wärtsilä can deliver LNG systems for propulsion and power generation for any applicable types of ship or engine.

    Technical data
    • Type C pressure vessel. Design pressure 6-9 bar.
    • Pressurised or cryogenic pump based gas feed solution.
    • Vacuum (MLI and Perlite) or polyurethane insulation.
    • Horizontal, vertical, longitudinal and transversal placing.
    • LNG process equipment locatedinside built-on tank connection space or deck mounted vaporising skid.
    • Class approved safety and control system.
    • Remote actuated and manually operated cryogenic valves.
    • Dedicated control and monitoring system.

    The Wärtsilä LNGPac™ system is based on an IMO type C LNG storage tank with either double walled vacuum or single walled polyurethane insulation. Bunkering takes place from the bunkering station to the LNG tank via an insulated pipe. All necessary process equipment is installed in a separate unit which can be either mounted directly to the LNG tank or placed remotely from the LNG tank. The main process equipment ensures correct gas temperature and pressure for the engines and other gas consumers.

    The LNGPac system can be customised to the needs of each project on a case to case basis. Dedicated engineering is conducted from the beginning of the project to match the specific operational requirements, safety- and classification society requirements.


    Wärtsilä can deliver LNG systems for propulsion and power generation for any applicable types of ship or engine, either as a standalone product or as a part of a complete propulsion system.

    Current references include the following ship types:

    • Product tanker
    • Cruise ferry
    • RoRo
    • RoPax
    • Small ferry
    • PSV
    • Tug
    Key benefits

    Our innovative features have made the LNGPacTM a simple plug and play solution with the following benefits:

    The Airlock can be integrated with the LNGPac™. This reduces the floor foot print, increases safety aspects and makes the installation for the yard much easier.

    The Control Cabinet can be integrated with the LNGPac™. This innovation results in a dramatic reduction of interfaces since the electrical cabling from the LNGPac™ to the external switchboards can be reduced to only a few cables. LNGPac automation can be connected to the Wärtsilä engine digital ecosystem for global maintenance support during complete vessel life cycle. One supplier for automation design, project execution, commissioning work and services - reducing project risk and minimizing delays in communication.

    The functional components of the GVU can be integrated as part of the LNGPac™. By combining the LNGPac™ and the GVU into a single system, considerable space can be saved. The solution will also save installation time and costs for the yard.

    A new evaporator type allows the engine LT-water to be directly connected to the LNGPac without the need of an intermediated heating media circuit. This leads to fewer interfaces and less installation work is required


    The LNGPac can be equipped with the Wärtsilä Svanehøj ECA fuel pump both for vacuum insulated tanks with the fuel pump placed in a cryosump integrated in the tank connection space or alternatively as a deepwell installation on single shell tanks.

    LNGPac™ design focuses on enabling safe service and maintenance of all core equipment related to the operational functionality of LNG bunkering and gas consumption without any need for emptying the tank.

    Methane number

    Wärtsilä Methane Number Calculator

    We have developed this tool for ship owners and operators to calculate the Methane Number of the fuel gas.
    The calculation result indicates whether or not the given gas quality is suitable for use in Wärtsilä dual fuel engines.

    Methane CH4
    Iso-butane (2-Methylpropane)i-C4H10
    Iso-pentane (2-Methylbutane)i-C5H12
    Neo-pentane (2,2-Dimethylpropane) neo-C5H12
    Mix-hexaneMix C6H14
    Mix-heptaneMix C7H16
    Carbondioxide C02
    Nitrogen N2
    Hydrogen sulfideH2S
    Total mol%
    Wärtsilä Methane number (WMN)
    Propane Knock Index (PKI)
    The calculation tool is owned by Wärtsilä and is made for customer use and is for guidance only. Changes in the tool is reserved at any time.
    We are making history in this big conversion so it’s not a mature market in terms of technology. Because there is no established way of doing things, we are working continually on new concepts.
    Mathias Jansson, Product Line Manager, Fuel Gas Supply Systems, Wärtsilä #GasBassador
    Mathias Jansson
    Business White Paper - Hybrid propulsion is part of the future for RoPax ferries

    Business White Paper: Hybrid propulsion is part of the future for RoPax ferries

    Green is undoubtedly the colour concept most dominating today’s shipping industry, and nowhere is this more true than in the ferry sector. Environmental considerations are, along with the need to optimize operational efficiency, high on the agenda of ferry operators around the world.

    Hybrid systems are being featured more and more on a variety of vessel types, but are particularly relevant to ferries since they are more likely to be operating within areas covered by strict environmental regulations.

    Download this white paper to get a better understanding of how to select the most appropriate power system configuration for your RoPax or RoRo ferry, not only for today, but for tomorrow as well.

    Multi-Lobe LNGPac

    Wärtsilä’s Multi-Lobe LNGPac is a fuel-gas-supply system for large LNG volumes of fuel. The system provides adequate storage and supply capabilities for gas-fuelled ships involved in extended voyages between port calls, such as cruise vessels, container ships, and large feeder vessels. 

    Wärtsilä offers the Multi-Lobe LNGPac as a full ‘one-stop-shop’ supply and service package that includes the onboard design, the system classification formalities, manufacturing, delivery, commissioning, and lifecycle maintenance.
    LNG pack-Cam05


    LNG as fuel for shipping - dynamics & growth

    Frank Harteveld
    General Manager, Fuel Gas Handling

    ’LNG as fuel for shipping
    Dynamics & Growth

    Video - Wärtsilä new and compact LNGPac


    We are proud to work closely with and support the following organisations to further the use of LNG as marine fuel.






    • Harvey Gulf
      Wärtsilä powered Harvey Gulf OSVs awarded Workboat of the Year 2015 title. Wärtsilä has supplied a fully integrated LNG system for six LNG offshore vessels owned by Louisiana-based Harvey Gulf.

      Harvey Gulf

    • JS INEOS Insight
      The highly advanced technological solutions that Wärtsilä provides makes these ships the most modern and environmentally sustainable gas carriers ever built.

      JS INEOS Insight

    • Bit Viking
      In 2011, the first ever marine conversion of Wärtsilä 46 engines to Wärtsilä 50DF dual-fuel engines was carried out on the product tanker Bit Viking, owned by Tarbit Shipping of Sweden. It also represented the first Wärtsilä 50DF dual-fuel marine installation with mechanical propulsion.

      Bit Viking

    • Viking Grace
      A new era in ferry operations was established in 2013 with the launch of the world’s largest Ro-Pax ferry operating on LNG fuel.

      This vessel features four Wärtsilä 50DF dual-fuel engines and a complete Wärtsilä LNGPac system that includes the storage tanks, the fuel supply system, and all equipment needed for bunkering and related safety and automation systems.

      Viking Grace

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    Full LNG solution propels BC Ferries forward

    As BC Ferries makes the switch to LNG, Wärtsilä is supplying more than just the equipment – they have been a partner through every stage of the process...
    5 October 2016
    • Twentyfour7. article

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    Contact us

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    Contact our 24/7 customer support at +47 815 48 500. For spare parts, please e-mail us with the equipment serial number or the name of the installation at moss-spares@wartsila.com (Inert Gas Systems) spares.wgs@wartsila.com (all other products) 
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