Pump Primer



Centrifugal



Advantages:
  • Lightweight but have a large capacity
  • Typically not expensive
  • High suction lifts and relatively high discharge heads
  • Not complicated machines — easy to operate and repair
Disadvantages:
  • Can wear out quickly if there’s not enough liquid to carry solids
  • Must be supervised
  • Can be noisy
  • Can take a long time to re-prime
Trash


Advantages:
  • Moves large volumes of water quickly
  • Can pass large volume of solids
Disadvantages:
  • Self-priming trash pumps must be manned to ensure continuous flow of water to the suction intake
  • Limited suction lift — should be as close to the pumping fluid as possible
Submersible


Advantages:
  • Can handle large volumes and have high discharge heads
  • Offer instant priming and can run dry
  • No suction hose
  • Unlimited suction life
Disadvantages:
  • Not made to pump thick liquids (trash versions can certainly handle solids)
  • If there isn’t sufficient electrical power, users might have to use a generator
  • Can only be inspected by pulling them out of the water
Diaphragm


Advantages:
  • Ideal for applications where there’s a variable flow of water
  • Can handle significant solids without fear of damaging the machine
  • Lightweight and portable
  • Designed for dry priming and dry running
  • Work best in situations where there’s a large amount of trash or sludge or where there is variable seepage, or both
Disadvantages:
  • Less capacity than a self-priming centrifugal pump, but cost about the same
  • Limited to 25-foot head at sea level

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