Pump Power
Power demand and motor selection for a centrifugal or positive-displacement pump from flow and total head.
Pump shaft power P_shaft2.91kW
- Hydraulic power P_h = ρgQH
- 2.04 kW
- Electrical input power
- 3.24 kW
- Suggested motor (10 % margin)
- 4 kW
- Pressure equivalent Δp = ρgH
- 2.45 bar
- Annual energy
- 6,473 kWh
METHOD
How it is calculated
P_h = ρ · g · Q · H P_shaft = P_h / η_p P_el = P_shaft / η_m
ASSUMPTIONS & NOTES
- H is the static lift plus pipe and fitting losses (take them from the pipe pressure drop tool).
- Pick the next IEC motor size above the duty-point shaft power plus 10–20 %.
- Check NPSH (cavitation) separately.
Results are for preliminary design and checking; base the final design on the governing standard and safety factors.
RELATED TOOLS