Since pump curves often are in head - feet or meters, its ...
Since pump curves often are in head - feet or meters, its may be necessary with a conversion to the common pressure scales used in pressure gauges - psi or bar.
Converting Head to Pressure
Converting head in feet to pressure in psi
Pump curves in feet of head can be converted to pressure - psi - by the expression:
p = 0.434 h SG (1)
where
p = pressure (psi)
h = head (ft)
SG = specific gravity
Converting head in meter to pressure in bar
Pump curves in meter of head can be converted to pressure - bar - by the expression:
p = 0.0981 h SG (2)
where
h = head (m)
p = pressure (bar)
Converting head in meter to pressure in kg/cm2
Pump curves in meter of head can be converted to pressure - kg/cm2 - by the expression:
p = 0.1 h SG (2b)
where
h = head (m)
p = pressure (kg/cm2)
Converting Pressure to Head
Since pressure gauges often are calibrated in pressure - psi or bar, it may be necessary with a conversion to head - feet or meter, common used in pump curves.
Converting pressure in psi to head in feet
h = p 2.31 / SG (3)
where
h = head (ft)
p = pressure (psi)
Converting pressure in bar to head in meter
h = p 10.197 / SG (4)
where
h = head (m)
p = pressure (bar)
Converting pressure in kg/cm2 to head in meter
h = p 10 / SG (4b)
where
h = head (m)
p = pressure (kg/cm2)
Example - Converting Pump Head - feet - to Pressure - psi.
The pressure - psi - of a water pump operating with head 120 ft can be expressed as:
p = (120 ft) 1 / 2.31
= 52 psi
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