WHAT IS CAVITATION ? LEARN IN EASY WAY......

TOPIC 1 - CAVITATION

1. WHAT IS CAVITATION ?

Cavitation is the process of air or Vapour lock in pump.

Term cavitation come from Latin word CAVUS which means hollow space or a cavity. Word cavitation define that rapid formation and collapse of cavity in a flowing liquid in region of very low pressure.

2. TYPE OF CAVITATION?

A.Vaporous Cavitation

B. Gaseous Cavitation

Vapour bubbles are formed due to the Vaporisation of process liquid that is being pumped. The cavitation condition occurred by formation and collapse of vapour bubble is commonly referred as Vapour pressure.  

Gas bubble are Formed due to presence of desolved gases in the liquid that is being pumped. The cavitation condition induced by formation and collapse of gas bubble is commonly referred as a gaseous cavitation.

Both type of bubbles are formed at a point inside the pump where the local static pressure is less than the vapour pressure of the liquid.

Vapour cavitation is most common form of cavitation found in process plant. Generally it occurs due to insufficiency of the available NPSH.

Gaseous Cavitation occurs where any gas or air enter in centrifugal pump along with liquid. Centrifugal pump can handle air in the range of ½% by volume, if the amount of air is increased to 6% the pump start cavitating.

Some of Problem Occurs due to cavitation  is,

1. high vibration

2. Reduced pump performance

3. excessive noise

4. Wear of pump parts

5. it also cause damage to the impeller or casing.

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my Next Topic will on NPSH and Terminology related to them.