Wärtsilä Cargo Handling System for Fully Pressurized Gas Carriers

Most of the vessels in the Gas Carrier fleet are fully pressurized with cargo tank volumes typically in the range of 1 000 m3 to 13 000 m3. Wärtsilä offers modern and advanced solutions for such vessels.

Fully pressurized vessels carry LPG at ambient temperatures and with corresponding saturated gas pressures. The design pressure for fully pressurized Cargo tanks is typically 18 bar(g).

Wärtsilä has developed the new and alternative QiCool design concept, which utilizes the best aspects of both fully pressurized and semi-refrigerated designs. With this approach, the cargo tank design pressure is reduced and cargo chiller units are installed.

The QiCool design allows an increased cargo loading rate of to 98% with design figures for SW and air temperature. The Qi Cool design enables the achievement of cost savings and higher revenues.

    Technical data

    The increased loading limit for a ship fitted with Wärtsilä’s QiCool chiller unit can be seen below:

    A ship with Wärtsilä’s QiCool chiller unit can be designed with a lower cargo tank design pressure. If the pressure is lowered to approx. 12bar(g), significant weight savings on the cargo tanks can be achieved.

    Loading limits
    Weight saving on Cargo Tanks for 5000m3
    QICOOL Chiller unit

    The QiCool chiller unit is a small & compact cooling system designed to maintain the cargo at its loaded temperature.

    QiCool chiller units enables the ship to load 98% liquid at all loading temperatures, thereby increasing the useful cargo load compared to a similar sized fully pressurized LPG carrier.

    Typical increased loading capacity for different cargoes (total tank volume 5000m3).

    QICool Chiller unit
    Increased loading capacity
    Cargo System Arrangement

    Complete and customizable cargo deck piping designs for fully pressurized LPG carriers.

    Cargo System arrangement
    LPG Barges

    Wärtsilä Gas Solutions can provide complete cargo handling systems for unmanned LPG barges, as well as the complete ship design package for such vessels.

    The key to the system design is its robustness and simplicity, which enhances ease of operation.

    The centralized control system comes with the option to monitor cargo system wirelessly from the pusher boat during transport.

    LPG Barges
    Latest references
    Ship owner Tank m³  Tank type  Year built  Shipbuilder  Type of cargo 
     Pertamina  5000
    19,0ata
     2ch
    -0°C
     2011  Taizhou Wuzhou  LPG & Ammonia
     Stealth gas  5000
    19,0ata
     2ch
    -10°C
     2015   STX  LPG & Butadiene VCM
     Stealth gas  5000
    19,0ata
     2ch
    -10°C
     2015  STX  LPG & Butadiene VCM
     Transpetro  7000
    19,0ata
     2ch
    -10°C
     2015  Promar  LPG & Butadiene
     Transpetro  7000
    19,0ata
     2ch
    -10°C
     2015  Promar  LPG & Butadiene
     Transpetro  7000
    18,0ata
     2ch
    -10°C
     2015  Promar  LPG & Butadiene
     Transpetro  7000
    19,0ata
     2ch
    -10°C
     2015  Promar  LPG & Butadiene
     Transpetro  4000
    19,0ata
     2ch
    -10°C
     2015  Promar  LPG & Butadiene
     Transpetro  4000
    19,0ata
      2ch
    -10°C
     2015  Promar  LPG & Butadiene

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