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Calculation

In case different countries habitually use different calculation units, don't worry, here we summarize the common unit conversions as follows:

The power consumption of the pump does not depend on the power of the pump motor, but the shaft power of the pump.

Both pumps are equipped with a 30kw motor. The shaft power of one pump is 20.56kw and the other is 25.18kw. Obviously, 20.56kw is more energy-efficient. The key to the size of the shaft power depends on the overall efficiency of the pump.

1 gallon	≈	3.7854	litre
1 litre	=	0.001	mᵌ
1 bar	=	14.5	psi
1 kW	=	1.34	hp
1 hp	=	0.75	Kw
1 mm	=	1000	μm
1 foot	=	0.3048	m
1 gpm	=	3.79	l/min
1 l/min	=	0.26	gpm
1 gpm	=	0.23	mᵌ/h
1 mᵌ/h	=	4.4	gpm
1 mᵌ/h	≈	16.67	l/min

Let's take some examples for how to select the right pump and configure motor power as following:

Hypothetical customer	Rated power frequencyHZ	Customer demand flow mᵌ/h	Customer demand pressure bar	Configure motor power kW	Independent fan √ or X	Corresponding HP pump selection flow mᵌ/h	Corresponding HP pump speed rpm	Required power
A	50	1.8	70	5.5	X	2.1	3000	4.929518072
B	50	3.5	45	7.5	X	3.5	3000	5.281626506
C	50	4.5	80.5	18.5	√	5.3	1500	14.30733936
D	50	6	45	11	X	6.3	1500	9.506927711
E	50	7	45	15	X	7.2	1500	10.86506024
F	60	8.2	60	18.5	√	8.2	1500	16.49879518
G	50	10	45	18.5	X	11	1500	16.59939759
H	60	10.6	55	22	√	11	1500	20.28815261

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