A Hydraulic Power Unit (HPU) is a self-contained system that generates and delivers pressurized hydraulic fluid to operate machinery, actuators, or tools. It serves as the “power source” of hydraulic systems, converting mechanical energy (via electric motor, diesel engine, or turbine) into hydraulic energy. Key components include a prime mover, hydraulic pump (gear, piston, or vane), reservoir for storing and cooling fluid, pressure relief and directional valves, ISO 4406-rated filters, accumulators, cooling system, and a control panel with PLCs and sensors.

HPUs operate by drawing fluid from a reservoir, pressurizing it, routing it to actuators, and returning it in a closed loop. They are available in types such as Electric (quiet, ideal for indoor use), Diesel (portable, suited for offshore/remote sites), and Pneumatic (for hazardous areas).

Offshore and marine HPUs must meet certifications from ABS, DNV, Lloyd’s Register, BV, and ClassNK, and comply with standards like ISO 4413 (design), ISO 13702 (fire safety), IEC 60092-504 (marine electrical), API RP 14C, API 614/674/675, and ATEX/IECEx for hazardous zones. Corrosion resistance is ensured via ISO 9227 and NORSOK M-501 coatings. Units undergo rigorous testing such as FAT, pressure, flow, vibration/shock (DNV), explosion-proof (ATEX/IECEx), and fire resistance (IMO FTP).

To ensure reliability, HPUs require proper filtration, cooling, and maintenance of seals and hoses. These units are essential for safe and efficient operation in offshore, marine, and industrial environments.