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MAINTENANCE OF HANDBOOK CENTRIFUGAL PUMP

Centrifugal Pump Troubleshooting Guide

The document provides troubleshooting steps for common issues with centrifugal pumps. It lists 10 potential problems including the pump not starting, no liquid delivered, and not enough liquid delivered.

CENTRIFUGAL PUMPS LIST OF TROUBLES

1. Pump not starting. 2. No liquid delivered. 3. Not enough liquid delivered. 4. Pump discharge pressure is low. 5. Pump looses prime after starting. 6. Pump overloads driver. 7. Excessive vibration. 8. Bearing overheat. 9. Bearing wears rapidly. 10. Text paras.

TROUBLE 1 : PUMP DOES NOT START

Is motor running. Is 3 Ph. supply available at motor terminals. Is impeller rotation Ok. Check the induction motor control panel/ TPI switch & cable &fuses. Check for pump motor coupling. Coupling defective. Check for impeller rotation. Motor is defective. Impeller defective. Power supply not available. Contact your foreman. Check for running of driving motor.

TROUBLE 2 : NO WATER DELIVERED.

Check for pump prime It may be lack of prime Priming OK Check whether speed low . Check with gauges normal suction should not exceed 15 ft. or 4.5 m. Check for impeller rotation,it may be in wrong direction. Check pipe / impeller for plugging. Contact your electrical foreman. Check valtage &Refer text para 2 Open sluice valve. Inspect piping suction strainer and impeller.

TROUBLE 3 : NOT ENOUG H WA TER BEING DELIVERED

Check for air leak in suction line or stuffing box. Check for speed, it may be low. Check for sluice valve, it may be closed. Check for plugging of pmpeller or suction line. Check for impeller damage or worn. Check voltage. Open the sluice valve. Check for suction lift. Check with gauges. Normal suction should not exceed 15 ft. or 4.5 m.

TROUBLE 4 : PUMP DISCHARGE PRESSURE IS LOW

Check for worn wearing rings. Check for worn gaskets. Replace all worn gaskets Check the foot valve or suction opening is submeged enough in water. Submerge entrance of suction pipe at least 3 ft.below surface of the liquid in source. Ask your foreman to get repair/replae the impeller. Check foot valve. It may be defective.