When the liquid flows through a centrifugal or axial flow pump, the static pressure (suction pressure) at the eye of the impeller is reduced and the velocity increases. There is therefore a danger that cavitation bubbles may form at the inlet to the impeller.
- Local pitting of the impeller can result when the bubbles collapse on a metallic surface
- Noise is generated in the form of sharp cracking when cavitation takes place.
Cavitation will not occur if critical cavitation number is greater than cavitation available. Every pump has a critical cavitation number which can only be determined by testing to find the minimum value of NPSH before cavitation occurs.
Wednesday, November 29, 2006
CAVITATION IN PUMPS
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