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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

Pwhp = q h SG / (3960 μ)                            (1)

where

Pwhp = 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:

Pwhp = q dp / (1715 μ)    (2)

where

Pwhp = water horsepower (hp)

dp = delivered pressure (psi)

Power required to pump water at 60oF:

Volume Flow
(gpm)
Power Required to Pump Water (hp)
Height (ft)
51015202530354050
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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  • en: pumps horsepower
  • es: bombas de potencia
  • de: Pumpen PS
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