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.

    Wärtsilä new and compact LNGPac


    • 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 delivery of the first in this series of the Dragon class vessels marks the beginning of a new era in the transportation of liquefied gases. The highly advanced technological solutions that Wärtsilä provides makes these ships the most modern and environmentally sustainable gas carriers ever built,"
      Steffen Jacobsen, CEO, Evergas.

      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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