Securing the position of its low-speed low-pressure X‑DF engines as market leaders, Winterthur Gas & Diesel (WinGD) has been selected to supply two 5-cylinder X72DF (5X72DF) engines for each of a pair of 180,000 m3 LNG carriers ordered by South Korean shipowner SK Shipping Co., Ltd (SK). The shipbuilding contract was signed in May 2016. The twin-skeg LNG carriers will be built by Hyundai Heavy Industries (HHI) and the engines by Hyundai Heavy Industries Co., Ltd / Engine & Machinery Division (HHI-EMD). They will be fitted with a GTT Mark III Flex membrane cargo containment system. In addition, the ships will feature HHI’s Hi-SGAS system combining fuel system supply for the two 5X72DF engines with the Hi‑SGAS system that can re-liquefy 100 % of the boil off gas (BOG) from the cargo.