Centrifugal pumps can further be classified as 

• end suction pumps
• in-line pumps
• double suction pumps
• vertical multistage pumps
• horizontal multistage pumps
• submersible pumps
• self-priming pumps
• axial-flow pumps

regenerative pumps 

Flow Rate and Pressure Head 

The two types of pumps behave very differently regarding pressure head and flow rate: 

• The Centrifugal Pumphas varying flow depending on the system pressure or head
• The Positive Displacement Pump
has more or less a constant flow regardless of the system pressure or head. Positive Displacement pumps generally gives more pressure than Centrifugal Pump's.

Capacity and Viscosity

Another major difference between the pump types is the effect of viscosity on the capacity:

• In the Centrifugal Pump the flow is reduced when the viscosity is increased
• In the Positive Displacement Pump the flow is increased when viscosity is increased

2011-03-10

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