Troubleshooting a Centrifugal Pump

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1. No liquid delivered

Possible causes: The pump has not been primed, air leaks into the suction pipe, or the suction lift exceeds the pump specification.

Source recommendations: Re-prime the suction line, inspect pipe joints and the foot valve, and remove debris that prevents the valve from closing.

2. Not enough liquid delivered

Possible causes: Air entrainment, an undersized suction pipe, a blocked pipe or foot valve, or impeller wear.

Source recommendations: Inspect joints for leaks, clean the suction inlet, check the pipe size, and inspect the impeller.

3. Motor overheating or excessive current

Possible causes: Overload, low voltage, phase loss in a three-phase system, excessive liquid viscosity, or damaged motor bearings.

Source recommendations: Check voltage and current, inspect bearings and the mechanical seal, and set the overload relay according to the nameplate.