Pumps characteristic curves are often in head - feet or metres - and also a conversion to press scales typically used in push gauges - choose psi or bar - might be required.

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convert head in feet to press in psi

Pumps characteristic curve in feet the head have the right to be converted to pressure - psi - by the expression:

p = 0.433 h SG (1)

where

p = pressure (psi)

SG = specific gravity the the fluid

converting head in metre to push in bar

Pumps characteristic curve in metre the head have the right to be converted to pressure - bar - through the expression:

p = 0.0981 h SG (2)

where

p = push (bar)

convert head in metre to push in kg/cm2

Pumps characteristic curves in metre the head deserve to be converted to press - kg/cm2 - by the expression:

p = 0.1 h SG (2b)

where

p = press (kg/cm2)

Since press gauges regularly are calibrated in push - psi or bar - a conversion come the heads commonly used in pump curves - like feet or meter - might be required.

Converting pressure in psi come head in feet

h = 2.31 ns / SG (3)

where

p = pressure (psi)

Converting push in bar come head in metre

h = p 10.197 / SG (4)

where

p = push (bar)

Converting pressure in kg/cm2 come head in metre

h = p 10 / SG (4b)

where

p = push (kg/cm2)

### Example - converting Pump Head - feet - to pressure - psi

The push - psi - of a water pump operating v head 120 ft have the right to be calculated v eq. 1 as:

p = 0.433 (120 ft) (1)

= 52 psi

### Example - Converting press - psi - to Pump Head - feet

The head infeet water column deserve to be calculated from press 100 psi with eq. 3 as:

h = 2.31 (100 psi) / (1) = 231 ft

Where specific gravity that water = 1.

### Feet that Head Water to 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 13.0
40 17.3
50 21.7
60 26.0
70 30.3
80 34.7
90 39.0
100 43.3
120 52.0
140 60.6
160 69.3
180 78.0
200 86.6
250 108
300 130
350 152
400 173
500 217
600 260
700 303
800 346
900 390
1000 433
water at 62°F (17°C)

### Head vs. Pressure when managing Liquids of different Density

Water 1.0 100 43.3
Kerosene 0.8 100 36.6
Sulphuric Acid 1.8 100 77.9

Identical pumps will build the very same head when running in ~ the same speed but the discharge push is quite different due to the different densities the the liquids. It have the right to be simpler to discuss the performance pumps in regards to head quite than pressure due to the fact that the use of head makes the pump curve applicable to any type of liquid regardless of density.

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