Florida Wastewater Practice Test

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What condition is indicated by cavitation in a centrifugal pump?

  1. Insufficient lubrication

  2. Excessive pressure

  3. Excessive turbulence

  4. Air pockets forming in the liquid

The correct answer is: Air pockets forming in the liquid

Cavitation in a centrifugal pump occurs when there are air pockets forming in the liquid. This happens when the pressure of the flowing liquid drops below its vapor pressure, leading to the formation of vapor bubbles. These bubbles can collapse violently as they move to regions of higher pressure within the pump, causing shock waves and potential damage to the pump components, such as the impeller. Understanding cavitation is crucial for the maintenance and operation of pumps, as it can lead to decreased efficiency and premature failure of the equipment. Proper system design, including maintaining adequate inlet pressure and avoiding factors that lead to pressure drops, can help mitigate the risk of cavitation.

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