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Cavitation Failure Analysis
Cavitation is caused by the presence of gas bubbles under high pressure being suddenly subjected to a low pressure. This causes the bubbles to burst (implode) and release energy to the metal surface, which causes the fracture of small, minute pieces of metal from the base casting.
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Possible Causes
Seal Water/Liquid Compressant
- Incorrect seal water (liquid compressant) rates
- Operation of liquid compressant above its vapor pressure
- Liquid compressant saturated with minute gas bubbles under pressure
Blocked Discharges
- Discharge port, pump outlet or drain blocked
Improper Clearances
- Clearance wide on pumps operating at high vacuum levels
Improper Working Pressure
- Working beyond maximum operating pressure (vacuum or compressor)
Possible solutions
Seal Water/Liquid Compressant
- Ensure proper seal water/compressant rate
- Lower vacuum
- Change liquid compressant
- Remove bubbles from liquid compressant
Blocked Discharges
- Unblock all ports, outlets and drains
Improper Clearances
- Ensure proper clearance is maintained
Improper Working Pressure
- Lower operating pressure
A Nash Field Service Technician can help you diagnose a cavitation issue, and a Nash WebSentry can alert you about poor conditions before problems begin. For more on these options, use the links below.
