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Diagnostic guide · Fontana, CA
Pump Cavitation Diagnosis Guide
Cavitation is the pump failure that sounds like damage happening — because it is. Vapor bubbles form at the impeller eye and collapse against the metal, pitting and eroding it like slow sandblasting from inside. This guide separates cavitation from its imitators and lists the causes in the order our Fontana pump shop checks them.
Diagnostic guide · Fontana, CA
Cavitation vs. aeration — they sound alike and are not
Cavitation: vapor bubbles born at low pressure at the impeller inlet, collapsing in higher pressure — noise like gravel or marbles, vibration, and pitting damage concentrated at the impeller eye. Aeration: air entering from outside — a suction leak, low tank level, a vortex at the intake — making similar noise and erratic performance but different damage. The distinction matters because the fixes live in different places.
Pump Cavitation Diagnosis Guide · Fontana, CAThe usual causes, in check order
Starved suction leads the list: clogged strainers, undersized or collapsed suction lines, suction lift too high, or a tank outlet pulling a vortex. Then come operating causes — running the pump far off its design point, excessive speed, and hot or high-vapor-pressure liquid shrinking the available margin. Discharge-side problems and recirculation show up as damage in different locations on the impeller, which is why an experienced eye reads the pitting pattern like a report.
If the noise is new, do not let it run in the name of production: cavitation damage compounds, and an impeller caught early is a repair while one run to failure takes the casing with it. Inspection and quotes are free in Fontana.
- Gravel noise + pitting at impeller eye: classic cavitation
- Noise + air in discharge: suspect suction-side air leak (aeration)
- Damage at impeller outlet edges: discharge recirculation
- Worse at high flow: system is asking beyond the pump’s suction margin
- Vibration rising over weeks: damage is progressing — schedule the inspection
Our 8-step repair process
A clear path from the first call to a tested component or machine returned to work.
Inspection
Disassemble and evaluate the complete failure.
Photos & video
Document condition and findings for a clear repair conversation.
Repair quote
Define the recommended work and quote before proceeding.
Approval
Confirm scope, urgency and the practical path forward.
Manufacturing
Machine, weld, rebuild or reverse engineer required components.
Testing
Verify operation and workmanship before release.
Shipment
Return the completed component or equipment to service.
Frequently asked questions
Can a cavitating pump be repaired?
Yes — if the casing survives. Impellers and wear components are renewed and the system cause corrected, which is the part that keeps it from recurring.
How do I know if it is cavitation or just a noisy pump?
The gravel-in-the-casing sound plus performance loss is the classic signature. An inspection confirms it and reads the damage pattern for the cause.
Related services
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