U&O (Utility and Offsite) is the supporting facilities consists of utility facilities (air systems; water systems; fuel systems; power generation; steam generation, etc.), and offsite facilities (firewater system; flare system; interconnecting piping; loading/ unloading; tankage & storage; waste water treatment, etc.). U&O facilities are typically constituted 20 ~ 50 percent of an entire project cost. (Refer to the Utility Facility; Offsite Facility)

Related Definitions in the Project: The Project; Engineering; Plant and Process Unit