SHPU: Subsea Hydraulic Power Unit is jointly developed by Siemens and Statoil for offshore oil and gas to provide hydraulic power at the well site. It supplies low pressure and high pressure control fluid to subsea control modules.
The subsea control module operates the hydraulic valves, downhole safety valve, and downhole chock/sliding sleeve. SHPU's hydraulic power is used if the umbilical fails and as an alternative to hydraulic lines in the umbilical. It has passed function tests under hyperbaric pressure equal to 500-m water depth.