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.

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
Change vacuum or sealant water temperature
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 can alert you about poor conditions before problems begin. For more on these options, use the links below.

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