Moss Maritime

Improving LNG Carrier Fuel Economy

Through the Moss LNG

Reliquefaction System

The patented Moss Reliquefaction System for LNG carriers handles the boil-off gas (BOG) from the ship’s LNG tanks and returns it in liquid form to the tanks. This means that part or all of the BOG can be preserved during the ship’s voyage. This allows the operator to choose slow speed diesel engines for the propulsion, improving efficiency and fuel economy.

The operation of the reliquefaction plant is simple and reliable. The liquefaction takes place by extracting the heat from the BOG with a closed nitrogen compression/ expansion cycle. This straightforward and footprint-friendly technology uses a minimum set of components, which are fitted in the ship’s cargo machinery room. The nitrogen cooling medium remains evenly distributed even in heavy seas, providing a reliable and operation-friendly system.

The Moss reliquefaction system has been chosen for installation on all 31 Q-flex LNG carriers with slow speed diesel propulsion for the Qatar project.