Pumping Water - Horsepower Requirements

Horsepower requirements pumping water

Energy imparted to the water by a 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, 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)

The table below can be used to estimate the power requirement for pumping water.

Volume Flow
(gpm)
Horsepower Required to lift water at 60oF (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

Related Topics

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

Related Documents

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  • de: Pumpen PS

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