• Pump Theory

• Pump Terminology

• Reading Pump Curves

• Centrifugal pump
  Operating Range

• Pump Enquiry Information

• System Curves

• Pump Parallel / Series

• Cavitation

• NPSH - Nett Positive
  Suction Head

• Affinity Laws

• Troubleshooting

• Disclaimer

Pump Theory

  1. The impeller spins & throws water out
    Like swinging a bucket of water above your head and staying dry or throwing clay on a potter's wheel and wearing it.

  2. Low pressure is formed in the pump inlet
    The lower the pressure, the higher the pump can "suck"

  3. Atmospheric pressure pushes more water in.

It is this simple - this is the major part of pump theory !
Understand this, and NPSH is easy!

pumps don't suck

in fact, nothing does.
Many things in our world work in the same way, by creating a low pressure area and allowing higher pressure air to apply force to water, air, or an object. This force explains the workings of :


all types of pumps
vacuum cleaners
car spoilers

etc, etc

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