Pumping Water - Horsepower Requirements

Horsepower requirements pumping water

The energy imparted to the water by a pump is called water horsepower and can be calculated as

Pwhp = q h sg / 3960     (1)

where

Pwhp = water horsepower (hp)

q = flow (gal/min)

h = head (ft)

sg = specific gravity

Horsepower can also be calculated as:

Pwhp = q dp / (1715 μ)    (2)

where

Pwhp = water horsepower (hp)

dp = delivered pressure (psi)

μ = pump efficiency, fraction

The table below can be used to estimate the power requirements when 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

Search the Engineering ToolBox

- "the most efficient way to navigate the Engineering ToolBox!"

Engineering ToolBox - SketchUp Edition - Online 3D modeling!

3D Engineering ToolBox - draw and model technical applications

Engineering ToolBox - SketchUp Edition - add standard and customized parametric components - like flange beams, lumbers, piping and more - to your SketchUp model - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro. Add from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

close