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South Korea's Hyundai Heavy Industries Co., Ltd. (HHI) has revealed that it has created a gas treatment system - the HHI Gas Management System - which can be used to reliquify boil-off gas (BOG) so that it can be utilized as marine fuel in liquefied natural gas (LNG) carriers.

According to a statement on the company's website, the gas treatment system can "reliquefy [sic] 100 percent of the BOG and re-store it in the LNG tank which can later be used as the ship's fuel, whereas the conventional systems can only reliquefy [sic] BOG partially".

HHI claims that an LNG carrier equipped with the HHI Gas Management System could "save up to 50 percent of the fuel cost in comparison with the standard vessel using heavy fuel oil (HFO) or marine gas oil (MGO), and produce 92, 80 and 23 percent less emissions of SOx, NOx and CO2, respectively".

The system's components include a BOG high-pressure compressor, a Hyundai integrated gas supply system (Hi-GAS), an ME-GI engine, and an LNG fuel gas supply system (FGSS).

HHI is building two 176,000-cubic-metre LNG carriers equipped with the new system for Norwegian shipping firm Knutsen OAS Shipping AS. They are scheduled to be delivered in 2016.