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Dixon Sanitary 2014
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Pump Technical
Centrifugal Pump Characteristics
The Dixon BC-Series centrifugal pump is characterized as a radial flow centrifugal pump. Radial flow pumps operate according
to a specific set of laws known as the Affinity Laws. These laws demonstrate the mathematical relationship between impeller
diameter, flow, pressure, brake horsepower, and motor speed. Each of these characteristics and the equations that govern them
will be given in detail below. It is important to understand that when dealing with variant centrifugal pumps such as axial or mixed
flow, other variables must be taken into consideration. The following equations are only intended for radial flow centrifugal pump
applications.
Variance in impeller diameter while maintaining constant motor speed
Variance in motor speed with constant impeller diameter
Where:
D= Impeller dameter (in)
Q= Flow rate (gpm)
H= Head pressure (ft)
BHP= Brake horsepower (hp)
Where:
S= Motor speed (rpm)
Q= Flow rate (gpm)
H= Head pressure (ft)
BHP= Brake horsepower (hp)
W