Centrifugal Pump


The centrifugal pump performs a single function. It uses centripetal force to impart velocity to a fluid. Because most pumps run at a constant speed they are a constant velocity device.

The centrifugal pump will pump all fluids to the same height or head regardless of their specific gravity. In other words, the pump will pump #6 fuel oil, or air to the same head or height. The only difference is the amount of horsepower it takes to do the job. The higher the specific gravity of the fluid you’re pumping, the more horsepower required.

All centrifugal pumps pump a combination of head and capacity. If you increase one, you must decrease the other. The pump curve describes this relationship.

Centrifugal pumps are available in either a single or multiple stage configuration:


Here is the single stage version with only one impeller.

If you wanted more head or pressure you would have to increase the diameter of the impeller or increase the pump’s speed.

Increasing the pump’s speed creates wear and damage problems

Multiple stage centrifugal pumps have more than one impeller.

This one has two impellers that let it produce twice the head or pressure without having to increase the pump speed.