Western Isles Western Isles Western Isles is owned and operated by DANA Petroleum UK Ltd. The FPSO was engineered, constructed and completed by COSCO Shipyard Group Co. in Qidong, China. Western Isles has been in operation since November 2017. Class DNV, Prod Notation Year Delivered 2017 Hull Diameter 70m Storage capacity 400,000 bbls Oil Production 44,000bopd Offloading Rate 3500 m3/h Riser Slots 17 POB Capacity 70