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Pumping Water - Required Horsepower

Horsepower required to pump water

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Energy imparted to water by the pump is called water horsepower - and can be calculated as

P_whp = q h SG / (3960 μ) (1)

where

P_whp = water horsepower (hp)

q = flow (gal/min)

h = head (ft)

SG = 1 for water Specific Gravity

μ = pump efficiency (decimal value)

Horsepower can also be calculated as:

P_whp = q dp / (1715 μ) (2)

where

P_whp = water horsepower (hp)

dp = delivered pressure (psi)

convert between power units

Power required to pump water at 60^oF:

Volume Flow (gpm)	Power Required to Pump Water (hp)
	Height (ft)
	5	10	15	20	25	30	35	40	50
5	0.01	0.01	0.02	0.03	0.03	0.04	0.04	0.05	0.06
10	0.011	0.03	0.04	0.05	0.06	0.08	0.09	0.10	0.13
15	0.02	0.04	0.06	0.08	0.10	0.11	0.13	0.15	0.19
20	0.03	0.05	0.08	0.10	0.13	0.15	0.18	0.20	0.25
25	0.03	0.06	0.10	0.13	0.16	0.19	0.22	0.25	0.32
30	0.04	0.08	0.11	0.15	0.19	0.23	0.27	0.30	0.38
35	0.04	0.09	0.13	0.18	0.22	0.27	0.31	0.35	0.44
40	0.05	0.10	0.15	0.20	0.25	0.30	0.35	0.40	0.51
45	0.06	0.11	0.17	0.23	0.28	0.34	0.40	0.46	0.57
50	0.06	0.13	0.19	0.25	0.32	0.38	0.44	0.50	0.63
60	0.08	0.15	0.23	0.30	0.38	0.46	0.53	0.61	0.76
70	0.09	0.18	0.27	0.35	0.44	0.53	0.62	0.71	0.88
80	0.10	0.20	0.30	0.40	0.50	0.61	0.71	0.81	1.0
90	0.11	0.23	0.34	0.46	0.57	0.68	0.80	0.91	1.1
100	0.13	0.25	0.38	0.50	0.63	0.76	0.88	1.00	1.3

Note! Individual pump curves should always be used for exact calculations.

horsepower required to raise water to various heights

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Related Topics

Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

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en: pumps horsepower
es: bombas de potencia
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