Wärtsilä cargo handling system for fully refrigerated gas carriers

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A leading supplier of complete cargo handling systems for gas tankers 

Wärtsilä is the leading supplier of complete cargo handling systems for gas tankers, and to many owners of fully refrigerated carriers Wärtsilä Gas Solutions has long been a preferred supplier. This leading market position is a result of our innovative and energy efficient solutions, together with the broadest portfolio of reliquefaction configurations. And of course, our extensive offering is supported by Wärtsilä’s unmatched global service network.

Our field proven cargo handling system for fully refrigerated gas carriers has evolved through decades, and is designed to ensure safe, dependable, efficient, operator and environmentally friendly operations. Our aim is to reduce your operating costs, contribute to an improved vessel EEDI and reduction of overall emitted GHG to the atmosphere.

The system is available to the full range of vessel sizes – from the very large (VLGCs), to large (LGCs) and medium (MGCs). It is prepared for integration with Wärtsilä’s gas fuel supply system, which further reduces overall GHG emissions from the vessel significantly.

Our delivery includes system engineering, material supply, supervision, and commissioning aid.


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    Technical data

    Primary cargoes on a fully refrigerated gas carrier are C-propane with various ethane content, propylene, and ammonia. These cargoes need to be loaded in fully refrigerated condition.

    Our cargo handling system provides shipowners and charterers a safe and flexible solution with the highest degree of efficiency. It is normally designed with two cooled cargo segregations, but tank combinations can be adjusted to support demands for flexibility. The manifold arrangement is designed for different terminal requirements, onshore and offshore, focusing on optimized loading and discharging. This reduces the time spent at terminal and thereby increases the vessels sailing time.

    Depending on owner and charterer’s demand, a deck tank can be part of the system design. The deck tank accommodates coolant for use during gassing up of the cargo tanks, but it can also be used for storage of condensate when gas freeing is needed. Alternatively, the same deck tank can be used for fuel storage – as part of Wärtsiläs fuel supply system (LFSS).

    The deck arrangement is designed for logical and easy access to all equipment, and most weather exposed instruments and major machinery are protected from the environment for improved durability and lifetime performance. The piping layout is designed primarily for gravity drainage of liquid back to cargo tanks, and the safety system includes state-of-the-art vents, gas detection and ESD`s.

    To effectively keep the cargo refrigerated during laden voyage, the system’s reliquefaction plant ensures required pressure control. Connected to vapor domes on the cargo tanks, the reliquefaction system condenses the cargo vapor and returns it to the cargo tank bottom. Our system design ensures that class requirements for cargo cooling redundancy are met.

    Our cargo handling system also includes a discharging system and a control system. The discharging system features main cargo pumps, booster pumps, cargo heater, level gauging and a high-level alarm system. Our control system is offered in different versions, with the most advanced delivered as part of an IAS system supply. The controls can be delivered with interfaces to subsystems like an inert gas system, load computer or LFSS, and integration of the ballast system is applicable.


    The system is delivered to fully refrigerated gas carriers of all sizes, which transport liquefied gases at low temperature and atmospheric pressure between terminals.

    Key benefits

    Wärtsilä’s cargo handling system for fully refrigerated gas carriers provides ultramodern yet proven technology – fully embracing our accumulated system expertise from decades as a frontrunner in gas solutions.

    The system offers flexible solutions for all vessel sizes and a wide range of cargoes and contributes to improved energy efficiency and reduced emissions. One feature leading to reduced GHG emissions and a smaller carbon footprint, is the possibility to integrate the cargo system with Wärtsilä’s gas fuel supply system.

    In case the cargo system needs venting, we have integrated an environmentally friendly  and revenue increasing solution for splitting of hydrocarbon and inert gases. The hydrocarbons are retrieved and returned to the cargo tanks, while inert gas is routed to the vent mast.

    Integration with Wärtsilä’s Operim® software. The Operim® enables remote monitoring and diagnostics, contributing to higher system uptime.

    A well-educated crew is key to safe and correct operation of a cargo handling system, and with our technology we offer training courses developed by Wärtsilä Gas Solutions Academy.

    As part of the Wärtsilä Corporation, Wärtsilä Gas Solutions offers its customers access to the industry’s most extensive global network of services and workshop facilities.

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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) 
    For technical support & service, please email us with the equipment serial number or the name of the installation at services.wgs@wartsila.com.
    Equipment serial number is taken from the equipment nameplate and includes all letters and numbers as given on the equipment nameplate.

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