Estimating Pump Head with Negative Suction Pressure

ESTIMATING PUMP HEAD WITH NEGATIVE SUCTION PRESSURE 

2= Elevation at discharge and suction, respectively gpm = Flow rate of liquid being pumped, gal/min dj = Diameter of discharge pipe, in. d, = Diameter of suction pipe, in. 

The reader should refer to the chapter on pumps for more detailed calculation methods and for a description of common pumping equipment and pumping applications. The simple relationships provided here are useful in obtaining initial design specifications information in sizing a pump for an application. 

Ym = Specific weight of mercury, lb/ft3 = (32.2) (specific gravity of mercury) 

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