Cavitation Flashcards
What is cavitation?
Phenomenon caused by loss of pressure on suction side of pump system
How does cavitation happen?
Pressure drops below vapor pressure causes bubbles (cavities).
Bubbles go through system to high pressure side
In high pressure side, bubbles burst with great force and damage the impeller
What type of damage is caused by cavitation
Metal of the impeller flakes off, creating a pitted or honeycombed appearance.
5 detrimental effects of cavitation
- Discharge of water is lowered
- Reduces output of power
- Reduces efficiency of unit
- Unusually noisy operation
- Increased vibration
Can operators easily detect cavitation happening?
Sometimes it is readily apparent…. but if cavitation is occuring in minor proportions it may be difficult to detect.
One way to prevent turbulence and cavitation?
Admission of air to turbines at light loads sometimes aids in controlling turbulence and cavitation
How to repair surfaces damaged by cavitation?
Arc welding and rebuilding the damaged surface
