Calculate flow rate, working pressure, motor power, tank capacity, and cooling requirements
Enter system flow rate and working pressure to calculate the minimum motor power required for your hydraulic power unit.
Power (kW) = (Flow (L/min) × Pressure (bar)) / (600 × Efficiency)
Enter system flow rate to calculate the recommended minimum hydraulic oil tank capacity.
Tank Volume = Pump Flow (L/min) × Multiplier (3-10×)
Enter cylinder specifications or actuator speed to calculate required flow rate.
Flow (L/min) = (Cylinder Volume (L) × 60) / Cycle Time (seconds)
Common standard electric motor power ratings for hydraulic power units:
| Kilowatts (kW) | Horsepower (HP) | Typical Flow @ 100 bar | Typical Pressure @ 50 L/min |
|---|---|---|---|
| 0.75 kW | 1.0 HP | 4.5 L/min | 9 bar |
| 1.5 kW | 2.0 HP | 9.0 L/min | 18 bar |
| 2.2 kW | 3.0 HP | 13.2 L/min | 26 bar |
| 3.0 kW | 4.0 HP | 18.0 L/min | 36 bar |
| 4.0 kW | 5.5 HP | 24.0 L/min | 48 bar |
| 5.5 kW | 7.5 HP | 33.0 L/min | 66 bar |
| 7.5 kW | 10 HP | 45.0 L/min | 90 bar |
| 11 kW | 15 HP | 66.0 L/min | 132 bar |
| 15 kW | 20 HP | 90.0 L/min | 180 bar |
| 18.5 kW | 25 HP | 111 L/min | 222 bar |
| 22 kW | 30 HP | 132 L/min | 264 bar |
| 30 kW | 40 HP | 180 L/min | 360 bar |
General guidelines for hydraulic tank capacity based on system type:
| Application Type | Tank Multiplier | Example: 50 L/min Pump | Key Considerations |
|---|---|---|---|
| Light Duty / Machine Tools | 3× Flow | 150 L (40 gal) | Stable temperature, short cycles |
| Medium Duty / Industrial | 5× Flow | 250 L (66 gal) | General purpose, moderate cycles |
| Heavy Duty / Mobile | 7× Flow | 350 L (92 gal) | Heavy loads, continuous duty |
| Extreme Duty / Steel Mill | 10× Flow | 500 L (132 gal) | Shock loads, high heat generation |
Haichen Industrial designs and manufactures custom hydraulic power units for all applications.