Hydraulic Power Units (HPU)


  • All pressure vessels and accumulators are constructed, inspected and certified (ā€œUā€ Stamped) to ASME Section VIII.
  • Only SAE O-ring type fittings are used on the nitrogen side of accumulators in order to prevent nitrogen leakage.
  • Accumulator pistons contain a small oil-filled cavity designed to lubricate the nitrogen side of the piston seals preventing seal failure associated with infrequent operation.
  • The oil reservoir is pressurized to assist pump suction. The HPU reservoir is closed to the atmosphere preventing ingress of moisture and contaminants which is critical when using biodegradable fluids.
  • Thermal Volume Motor Control.


  • HPUs from 5 gallon capacity to 2000 gallon capacity
  • Operating pressures up to 3000 psi with standard components
  • Biodegradable hydraulic fluids or petroleum based fluids
  • Electrical classifications NEMA 4, 4X, 7, 9 or comparable CENELEC standards
  • Offshore trim with Ameron high performance coating systems where required
  • PLC or relay based control logic
  • Energy sources:
    • Electric motors
    • Pneumatic driven hydraulic pumps
    • Solar power to electric motors
    • Gasoline or diesel fuel engines
    • Any combination of energy sources

Hydraulic Power Units (HPU)