The Douglas FPSO processed production from subsea wells through three-phase separation, oil stabilization, and produced water treatment. Stabilized crude was stored in the vessel's cargo tanks and exported via the CALM buoy system. Produced water was treated to environmental discharge standards. Associated gas was used for onboard fuel, with surplus managed through controlled disposal systems. Utilities included power generation, seawater lift, firewater and deluge systems, chemical injection, inert gas systems, and integrated control and safety systems. The FPSO was permanently moored and designed for long-term offshore service. Its layout emphasized safe tanker export, compact processing, and reliable operation in Central North Sea conditions during the field's productive life.