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A troubleshooting guide · Fontana, CA
Guide to Diagnosing Pump Cavitation
You can hear cavitation destroying a pump while it happens — because that noise genuinely is destruction. Bubbles of vapour appear at the impeller eye and implode against the metal, pitting and eating it away much like sandblasting carried out from the inside. Below, we separate true cavitation from the problems that imitate it and run through the causes in the order our Fontana pump shop investigates them.
A troubleshooting guide · Fontana, CA
Cavitation versus aeration — similar noise, different fault
With cavitation, vapour bubbles form where pressure drops at the impeller inlet and then collapse as pressure rises — producing a gravel-or-marbles racket, vibration, and pitting clustered at the impeller eye. Aeration is air drawn in from outside, through a suction leak, a low tank level or a vortex at the intake; it sounds much the same and makes performance erratic, yet it damages the pump differently. Telling the two apart matters, because each is fixed in a different place.
Diagnosing pump cavitation · Fontana, CAThe common causes, in the order we check them
Suction starvation tops the list: blocked strainers, suction lines that are undersized or have collapsed, too much suction lift, or a vortex forming at the tank outlet. Operating causes follow — a pump run far from its design point, over-speeding, and hot or high-vapour-pressure liquids eating into the available suction margin. Problems on the discharge side, and recirculation, mark the impeller in different places again, which is why an experienced technician reads the pitting pattern the way you would read a report.
When the noise is new, resist the temptation to keep running for the sake of production: cavitation damage accelerates, and an impeller caught early is a straightforward repair, whereas one run to destruction usually takes the casing with it. In Fontana, inspection and quotes cost nothing.
- Gravel-like noise plus pitting at the impeller eye points to classic cavitation
- Noise with air in the discharge suggests a suction-side air leak — aeration
- Damage along the impeller outlet edges indicates discharge recirculation
- Symptoms worse at high flow mean the system is demanding more than the pump's suction margin allows
- Vibration climbing week by week means damage is advancing — book the inspection
What happens once the pump reaches us
Diagnosis leads into the same eight-step route every repair follows, from first call to tested return.
Inspection
The unit is disassembled so the complete failure can be evaluated.
Photos & video
Findings and condition are documented for a clear repair conversation.
Repair quote
Before proceeding, the recommended work is defined and quoted.
Approval
We confirm scope, urgency and the practical path forward with you.
Manufacturing
Required components get machined, welded, rebuilt or reverse-engineered.
Testing
Before release, operation and workmanship are verified.
Shipment
The completed component or equipment is returned to service.
Cavitation questions
Can a pump damaged by cavitation be saved?
Yes — provided the casing remains intact. We renew the impeller and wear components and correct the system cause behind it, which is what stops the problem coming back.
How can I tell cavitation from ordinary pump noise?
The classic signature is that gravel-in-the-casing sound combined with falling performance. An inspection settles the question and reads the damage pattern to identify the cause.
Related services
Noise getting worse? Call the rush line today.
(949) 400-2937Book a diagnosis or open a repair order
Book a diagnosis visit.
Include the make and model, the noise you are hearing, where the pump sits, how urgent it feels and the service time you would prefer. Everything opens as a text to John, giving you the chance to read it over before sending.