# Pumping Water - Required Horsepower

## Horsepower required to pump water

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)

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.

## Related Topics

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

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