St. Fergus comprises multiple processing trains for inlet scrubbers, dehydration units, turbo-expanders and cryogenic de-ethaniser trains to remove liquids and recover NGLs (ethane, propane, butane). Sales gas is dehydrated and treated before being fed into the UK National Transmission System; recovered liquids are piped to adjacent fractionation and export facilities at Mossmorran or to other distribution points. The terminal handles pressure management, slug catching, gas quality control and metering; utilities include large-scale compressors, heat exchangers, flare systems, and advanced control and safety instrumentation. Its network of pipeline landfalls links to the Flags, Fulmar, FUKA and Vesterled systems, enabling robust and flexible reception of North Sea gas supplies.