h = head (m)
p = pressure (kg/cm2)
The pressure - psi - of a water pump operating with head 120 ft can be calculated with eq. 1 as:
p = 0.433 (120 ft) (1)
= 52 psi
The head in feet water column can be calculated from pressure 100 psi with eq. 3 as:
h = 2.31 (100 psi) / (1)
= 231 ft
Where specific gravity of water = 1.
Download pressure vs head imperial units as pdf file
Download water pressure vs head - SI units as pdf file
|Liquid||Specific Gravity||Head |
Identical pumps will develop the same head when running at the same speed but the discharge pressure is quite different due to the different densities of the liquids. It can be simpler to discuss the performance pumps in terms of head rather than pressure since the use of head makes the pump curve applicable to any liquid regardless of density.
Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more.
An introduction to Centrifugal Pumps.
Modulating pumps to adapt capacities to variable process demands.
The characteristics of stable and unstable flow.
Depth and hydrostatic pressure.
Major and minor loss in pipes, tubes and duct systems.
Pressure vs. head units - like lb/in2, atm, inches mercury, bars, Pa and more.
Convert between pressure units like Pa, bar, atmosphere, pound square feet, psi and more.
Horsepower required to pump water.
The energy equation can be used to calculate the head rise in pumps and fans.
Static pressure vs. pressure head in fluids.
Pressure in pounds per square inch (psi) vs. head in feet of water (ft h2o).
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