Pump power & head required
Hydraulic, shaft and motor power for a given duty point. Sanity-checks every centrifugal-pump quote.
Hydraulic power
1.96kW
= 2.63 hp
Shaft (pump) power
3.02kW
= 4.05 hp
Motor input power
3.35kW
= 4.5 hp
Suggested motor size
4kW
= 5.36 hp
Next standard IEC rating up.
Pump power specification
For a duty point of 5 L/s at 40 m TDH, hydraulic power is 1.96 kW. Assuming 65 % pump and 90 % motor efficiency, the motor draws 3.35 kW electrical. Specify a 4 kW motor (next standard IEC rating).
65 % pump × 90 % motor = 58.5 % wire-to-water.