PFLNG Dua receives production through two approximately 12-kilometre, 10-inch flexible flowlines connected to a subsea manifold and the Rotan well system. Four 10-inch flexible risers and three control umbilicals enter the vessel through an external turret. The turret is secured by twelve chain-and-polyester mooring legs arranged in three groups and anchored by suction piles, allowing the hull to weathervane while maintaining continuous fluid and control connections. The topsides separate reservoir liquids and treat the feed gas before liquefaction. Documented treatment includes acid-gas removal for carbon dioxide and hydrogen sulphide, followed by gas conditioning and refrigeration. LNG is stored in purpose-built tanks with total capacity of approximately 177,000 cubic metres. The 393-metre-long, 64-metre-wide vessel loads LNG directly to carriers positioned alongside; it therefore requires neither an export pipeline nor a separate storage vessel. Permanent support systems include electrical transformers, high- and low-voltage switchboards, motor-control centres, power-management software and prefabricated electrical houses. The installation also incorporates condensate handling, metering, chemical injection, flare and pressure-relief equipment, fire-and-gas detection, emergency shutdown, firewater, marine systems, communications and accommodation. Its turret and riser arrangement was designed for deployment across water depths from approximately 500 to 1,500 metres, making Rotan the vessel’s first ultra-deep-water operating location.