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Friday, February 20, 2009

Converting Pump 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)

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)

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)

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, commonly used in pump curves.

Converting pressure in psi to head in feet

h = p 2.31 / SG (3)

h = head (ft)
p = pressure (psi)

Converting pressure in bar to head in meter

h = p 10.197 / SG (4)

h = head (m)
p = pressure (bar)

Converting pressure in kg/cm2 to head in meter

h = p 10 / SG (4b)

h = head (m)
p = pressure (kg/cm2)


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