Identical pumps will develop the same head when running at the same speed but the discharge pressure is quite different due to the different densities of the liquids. ![]() Pressure - Liquids of different Density Liquid Pressure when handling Liquids of different Density Head vs. Pressure HeadÄownload pressure vs head imperial units as pdf fileÄownload water pressure vs head - SI units as pdf file Head vs. Feet of Head Water to psi Pumps - Water Head vs. The head in feet water column can be calculated from pressure 100 psi with eq. = 52 psi Example - Converting Pressure - psi - to Pump Head - feet The pressure - psi - of a water pump operating with head 120 ft can be calculated with eq. P = pressure (kg/cm 2) Example - Converting Pump Head - feet - to Pressure - psi P = pressure (bar) Converting pressure in kg/cm 2to head in metre P = pressure (psi) Converting pressure in bar to head in metre Converting pressure in psi to head in feet Since pressure gauges often are calibrated in pressure - psi or bar - a conversion to the heads commonly used in pump curves - like f eet or meter - may be required. P = pressure ( kg/cm 2 ) Converting Pressure to Head Pumps characteristic curves in metre of head can be converted to pressure - kg/cm 2- by the expression: P = pressure (bar) Converting head in metre to pressure in kg/cm 2 Pumps characteristic curves in metre of head can be converted to pressure - bar - by the expression: SG = specific gravity of the fluid Converting head in metre to pressure in bar Pumps characteristic curves in feet of head can be converted to pressure - psi - by the expression: ![]() Converting Head to Pressure Converting head in feet to pressure in psi Pumps characteristic curves are often in head - feet or metres - and a conversion to pressure scales commonly used in pressure gauges - like psi or bar - may be required.
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