The phenomenon of cavitation is due to the formation and subsequent implosion of vapour bubbles forming inside the impeller blades due to an internal pressure lower than the vapour pressure of the pumped liquid at a given temperature.
With waste water electric pumps cavitation can occur for the following reasons:
- Suction pipe too long (only in the case of installations in dry chamber)
- Intake of small quantities of air bubbles due to the creation of vortices caused by the dynamic level lower than m…
- If the effective work duty point goes outside the normal electric pump utilization field
- Water based liquids with temperatures above 80°C.
N.B.: Cavitation can cause the following malfunctions:
- Changes in hydraulic performance
- Excessive noise (rattling)
- Violent vibrations with possible failure of seals, bearings and the shaft