Converting Pump Head to Pressure

Converting head (ft or m) to pressure (psi or bar, kg/cm2) and vice versa

Pump characteristic curves are often in head - feet or meters - and a conversion to common pressure scales used in pressure gauges - like psi or bar - may be required.

Converting Head to Pressure

Converting head in feet to pressure in psi

Pump characteristic curves in feet of head can be converted to pressure - psi - by the expression:

p = 0.433 h SG         (1)

where

p = pressure (psi)

h = head (ft)

SG = specific gravity of the fluid

Converting head in meter to pressure in bar

Pump characteristic 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 characteristic 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 - a conversion to head commonly used in pump curves - like feet or meter - may be required.

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 calculated as:

p = (120 ft) 1 / 2.31

    = 52 psi

Feet of Head Water to psi

Feet Head psi
1 0.43
2 0.87
3 1.30
4 1.73
5 2.17
6 2.60
7 3.03
8 3.46
9 3.90
10 4.33
20 8.66
30 12.99
40 17.32
50 21.65
60 25.99
70 30.32
80 34.65
90 38.98
100 43.31
120 51.97
140 60.63
160 69.29
180 77.96
200 86.62
250 108.27
300 129.93
350 151.58
400 173.24
500 216.55
600 259.85
700 303.16
800 346.47
900 389.78
1000 433.0
  • water at 62oF

Related Topics

  • Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

Related Documents

Key Words

  • en: pump head pressure converter
  • es: convertidor de presión de cabeza de la bomba
  • de: Pumpenkopf Druckwandler

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