Merchant Vessels

Wärtsilä provides environmentally and economically sound integrated solutions for merchant vessels, such Gas Carriers, Tankers, Container Vessels and a variety of other cargo vessels.

    Gas Carriers

    The combination of Wärtsilä’s proven dual-fuel engine technology and electric propulsion systems together with the new LNG Carrier design portfolio and gas handling systems enables Wärtsilä to offer solutions for LNG Carriers that offers significant benefits over alternative concepts.

    • Design and main equipment delivered by the same company improves quality, efficiency, communication, flexibility and integration.
    • Collective knowledge of the wider Wärtsilä group and affiliates, to overcome technical challenges
    • Access to extensive data and information on all main equipment as well as research and development
    • Integrated environmental solution and energy saving devices
    • Single project management contact with local execution capabilities
    • Responsibility centralized on a single supplier for equipment and design


    Tankers currently represent 27% of the world’s merchant fleet larger than 2000 grt. They carry a variety of liquid cargoes in bulk, such as crude oil, products and chemicals.

    In most cases, the voyages are long, and fuel consumption is usually a main focus area for the operator. Wärtsilä takes pride in supporting its customers’ in the tanker market with economically sound solutions.

    Vessel Type Size
    ULCC, ultra large crude carrier > 350,000 dwt
    VLCC , very large crude carrier 250,000-325,000 dwt
    Suezmax 125,000-170,000 dwt
    Aframax 80,000-120,000 dwt
    Panamax 60,000-80,000 dwt
    Handymax 40,000-60,000 dwt
    Handy 10,000-40,000 dwt
    Small < 10,000 dwt

    Bulk Carriers

    Today, bulk carriers make up 21% of the world’s merchant fleet.

    Ship owners, operators and yards are able to benefit from low running costs, reliability and easy installation with solutions provided by Wärtsilä, and from the support provided throughout the entire life cycle of the equipment.

    Container Vessels

    Container vessels form 13–14% of the world’s merchant fleet and are a vital element within the transportation infrastructure supporting the global economy. Reliability is, therefore, essential.

    Wärtsilä serves its container vessel customers with integrated solutions that offer significant cost savings. High energy efficiency has the greatest impact on operating costs and is delivered by solutions from Wärtsilä which combine ship design, an engine with low fuel consumption, high-efficiency waste heat recovery (WHR) system, and optimum propeller and rudder designs. 

    Vessel Type Size
    ULCV, Ultra large container vessel above 10000 TEU
    Post-Panamax 5000-10000 TEU
    Panamax 3000-5000 TEU
    Feedermax 2000-3000 TEU
    Feeder 1000-2000 TEU
    Small feeder below 1000 TEU

    Wärtsilä offers designs for container vessels in many different size classes.

    Delta Tuning
    In case the operational profile of the vessel changes with a new charter contract and allows a lower speed, Wärtsilä can propose an easily reversible solution to save fuel by adopting the Delta Tuning for the RT-flex engines.
    By allowing injection pressures and timing to be optimised at all loads, Wärtsilä RT-flex engines have lower fuel consumption at part loads compared with conventional camshaft-type engines. Advantage has been taken of the complete flexibility in fuel injection and valve operation allowed by RT-flex common-rail technology to offer, through Delta Tuning, even lower specific fuel consumption when running at less than 90% engine load.

    Low-Load Tuning
    The most effective way to achieve fuel savings is to reduce the ship speed. When this is planned to be adopted for a long time, Wärtsilä can propose the Low-Load Tuning package which allows RT-flex engines to be tuned for the best fuel efficiency at partial load. This can also be retrofitted on existing vessels.
    Reduced part-load fuel consumption is offered by Low-Load Tuning through a package of measures for RT-flex low-speed engines:

    • Part-load optimised turbochargers
    • Increased combustion pressure at less than 75% MCR
    • Late exhaust valve closing to reduce NOX emissions
    • Exhaust waste gate opening at 85% MCR

    Cargo Vessels

    Cargo vessels represent 25–30% of the world’s merchant fleet. The latest general cargo vessels tend to be for specialised applications, such as multipurpose carrier (MPP).

    Whatever the vessel’s operating profile, Wärtsilä offers customized solutions that meet the specific needs of ship owners and operators. Wärtsilä innovative approach and broad product portfolio enable fit-for-purpose cargo vessels to have the flexibility needed to achieve clear environmental and economic benefits.

    The ability of Wärtsilä to combine products into a single solution package that combines ship design, engines, gearboxes, automation, electrical systems, propulsion, seals & bearings, environmental solutions and more, provides guaranteed performance of the complete installation, uniform documentation, a single point of contact, and an efficient propulsion plant in which all parts are engineered to work in harmony.

    Ro-Ro/PCTC Vessels

    Ro-Ro vessels are designed to transport wheel-based cargo or cargo loaded on wheel-based equipment. Frequent port calls mean that emissions must be minimized, while the efficient loading and unloading of the ship is a primary requirement.

    Ro-Ro vessels typically operate on short trades with frequent port calls. Their operating profile shows that some 36% of these vessels spend more than 80% of their time in ECA (Emission Control Area). To help meet environmental legislation, Wärtsilä offers a wide range of environmental solutions that gives our customers the ability to operate wherever whenever.

    PCTC (Pure car/truck carrier) vessels are purpose built for the transportation of different types of rolling cargo. The essential requirement is that the machinery installation occupies the minimum space to maximize cargo space and facilitate cargo handling. 


    The future of

    container shipping

    Find out more


    fuel-efficient and sustainable -
    the Wärtsilä 14
    highspeed engine

    Find out more

    Merchant ship design

    Container Feeders

    Available in three versions: HFO, HFO with exhaust cleaning systems, dual-fuel engines

    Download Datasheets

    GAS carriers/ bunkering vessels

    Fuel economy, performance guarantees, optional versions to meet specific needs

    Download Datasheets


    Proven Wärtsilä SK 5054 ship design has been used for 60+ vessels already in operation

    Download Datasheets


    Keeping the ships sailing out of Africa

    Digitalisation is now a fundamental tool for improving efficiency in the marine services sector. With...
    16 August 2016
    • Twentyfour7. article

    Good Fortunes ahead

    Wärtsilä’s best brains helped Evergas design a multigas fleet of “Dragon Class” gas carriers for INEOS...
    24 November 2015
    • Twentyfour7. article

    Tanker trio streamlines the waterline

    Heading below the waterline allowed Wärtsilä engineers to redesign its Aframax hull, increasing flow...
    1 December 2014
    • Twentyfour7. article


    • Arklow Shipping fleet
      For its new build programme of 25 ships, Arklow Shipping requested a stable and always available internet solution for both operational and crew needs. Wärtsilä met this need by providing a 60 cm VSAT installation, complete with an lP phone system, network management and airtime.

      Arklow Shipping fleet

    • Clipper Harald
      Solvang selected the Wärtsilä Open Loop Scrubber System to be retrofitted onboard the LPG (Liquefied Petroleum Gas) tanker “Clipper Harald”.

      The Wärtsilä scrubber systems enables the vessels to comply with current and anticipated environmental legislation, and to operate without restrictions in Emissions Control Areas (ECAs).

      Clipper Harald

    • El Coquí and Taíno
      El Coquí and Taíno will be the very first LNG powered, American flagged, container RoRo ships. They will operate between Jacksonville, Florida and San Juan, Puerto Rico on a weekly rotational basis.

      El Coquí and Taíno

    • Emma Maersk
      The Emma Maersk is the first of a new series of 11,000 TEU container liners being built for the Danish A.P. Moller-Maersk Group by Odense Steel Shipyard Ltd in Denmark.

      Emma Maersk

    • 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

    Contact us

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