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