Centrifugal Pump Troubleshooting Chart [PDF]

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CENTRIFUGAL PUMP TROUBLESHOOTING CHART N O 1



2



PROBLEM / SYMPTOM No liquid being pumped



Pump not producing rated flow or pressure



CAUSE Suction lined plugged/ clogged Pump not primed Impeller clogged Incorrect rotation Air leak at stuffing box Air leak at gasket Impeller partly clogged Low suction head



3



4



5



6



7



Hot bearing



Pump Vibrates



Pump begin to pump and then stops



Motor amperage draw is excessive



Leakage at stuffing box



Improper lubrication Improper alignment Poor alignmet Worn bearings Pump is cavitating



CORRECTION



Clear obstrcutions Reprime pump Try back flushing to clear impeller Reverse motor leads to ac Tighten packing/ replace m seal Replace with new gasket proper gasket sealant if re



Back Flush Open suction valve all the and check suction piping Check for proper grease o and relubricate Realign pump and motor Align motor and pump sha Replace bearings Recalculate pump/ check attributes



Unbalanced impeller



If due to foreign material, flus; If impeller is worn, re



Broken parts on impeller of shaft Air pocket in suction line



Replace impeller



Air leak in suction line Pump not primed properly Rotating parts are binding



Plug the leak Reprime pump Check rebuilding procedu correct interfering parts



Pump is pumping too much liquid Stuffing box packing is too tight Worn mechanical seal parts Shaft sleeve (if used) is scored or cut



Machine impeller to small



Packing improperly adjusted



Tighten or replace packin material



Change piping to elimina pocketing



Readjust Replace seal Replace sleeve with new, remachine and replace