What are self-priming pumps?

Self-priming pumps are special category of liquid pumps that have the necessary fluid to start the pump inside their body. This is like just another centrifugal pump but with an external casing that can rush water into the inner pump. Many sanitary processing industries are found to use this type of pump due to the many advantages.

General uses of water pump:

  • To move liquid through process lines
  • Pump liquids to clean and sanitize the pumps
  • Transferring from one storage to another area
  • To empty the tanks

Pumps that have the required liquid to start in their chamber are called the self-priming water pump. Here the outer casing is filled with the liquid that is to be pumped. The impeller then rotates creating a low-pressure area. Water is then pushed up due to atmospheric pressure and air in the suction pump lines up. The air is separated from the liquid and then the flow becomes normal.

water pump

Features of centrifugal pumps:

  • Durable
  • Simple
  • Lesser cost involved
  • Suited for pumping water and low viscosity fluids

While these are standard features of a centrifugal pump, self-priming pumps are a special type of centrifugal pump. During the priming process, they eliminate the role of air binding with liquid by mixing residual air with fluid in the pump’s working.


  • They can handle a variety of liquids.
  • They can pump a liquid even if it is not submerged in a vessel
  • Frequent and regular pumping operations can benefit from self-priming pumps.
  • This type of pump works great with corrosive liquids, and suspended solids.
  • Raw sewage, industrial wastes, and sludge can be easily pumped with a self-priming pump.
  • They are highly cost-efficient and also safe to use.
  • The setting up cost and infrastructure required to set up is less.