MIL-HDBK-1164
Table 12
Troubleshooting Checklist for Centrifugal Pumps
Symptom
Possible Cause
Pump does not deliver water.
Pump not primed.
Pump or suction pipe not completely filled with
water.
Suction lift too high.
Air pocket in suction line.
Inlet of suction pipe insufficiently submerged.
Suction valve not open or partially open.
Discharge valve not open.
Speed too low.
Wrong direction of rotation.
Total head of system higher than design head of
pump.
Parallel operation of pumps unsuitable for existing
conditions.
Foreign matter in impeller.
Insufficient capacity delivered.
Pump or suction pipe not completely filled with
water.
Suction lift too high.
Excessive amount of air or gas in water.
Air pocket in suction line.
Air leaks into suction line.
Air leaks into pump through stuffing boxes.
Foot valve too small.
Foot valve partially clogged.
Inlet of suction pipe insufficiently submerged.
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