The centrifugal pump does not deliver flow
Thread Content
During driving, this situation occurred several times: there was no obvious abnormality in the operation of the pump； Import and export pressures are normal ； But why doesn’t the level of the liquid in the suction tank drop? ? Whenever this happens, we can only restart the pump to confirm the measurement! ! What is the reason for this situation? / Does cavitation cause flow interruption? ? Shouldn’t the outlet pressure fluctuate greatly, or could there be an issue with the pump’s operation? Some expert advice, please! ! ? ?
Below are the common faults of centrifugal pumps for reference: Fault symptoms Possible causes Difficulty in supplying liquid • Insufficient rotation speed； • Output pressure is too high ； • The suction lift is too high ； • The water table is too low ； • Impeller flow channel blockage ； • The pump is rotating in the wrong direction ； • The pump is not filled with fluid. Insufficient flow • Air leakage in the inlet pipeline or seal ； • The rotation speed is too low ； • Head higher than the rated value ； • Vacuum line restrictions, valve shutoff, or clogged filter screen ； • The suction lift is too high ； • Diving too deep ； • Impeller flow channel blockage ； • Mechanical failure: Damaged or worn impeller, damaged wear rings, faulty gaskets. Insufficient pressure • Too low rotation speed ； • Gas in the liquid ； • Insufficient vacuum pressure ； • Mechanical failure ； After the pump is started, the liquid that was originally filled in the pump chamber is gone • Leakage in the vacuum line ； • The suction lift is too high ； • Vacuum line blockage ； • Gas in the liquid ； • The seal has failed ； • Seal gasket failure ；
Check the filling pump, examine the outlet pressure and system pressure, and verify whether it exceeds the pump’s capacity (high flow rate resulting in an outlet pressure lower than the designed value)