The pump head is the actual pressure developped by a pump. It is expressed in m of liquid (water for pump characteristics graphs).
The pump head takes into consideration the difference of pressure in between suction and discharge but also the speed difference, all converted to m of liquid.
How to calculate the pump head :
Equation 1 : Pump Head
ps : pressure at suction (bar)
pd : pressure at discharge (bar)
spgr4t : specific gravity of the liquid processed
us : velocity at suction (m/s)
ud : velocity at discharge (m/s)
Pump head is a key piece of information found on pump characteristic.
Figure 1 : Pump characteristic curve