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Centrifugal pump repair and maintenance FAQ
- Jul 13, 2018 -

Centrifugal pumps are generally prone to the following failures:

a. The pump can not start or the starting load is large. The reasons and treatment methods are as follows: (1) The prime mover or power supply is abnormal. The solution is to check the power and prime mover conditions. (2) The pump is stuck. The treatment method is to check the coupling by hand, and disassemble if necessary to eliminate the malfunction of the static and dynamic parts. (3) The packing is pressed too tightly. Centrifugal pump The treatment is to relax the filler. (4) The discharge valve is not closed. The treatment is to close the discharge valve and restart. (5) The balance tube is not smooth. The treatment method is to clear the balance tube.

b. The pump does not drain. The reasons and treatment methods are as follows: (1) The pump is not enough (or the pump gas is not exhausted). The treatment is to refill the pump. (2) The pump is not turning right. The method of processing is to check the direction of rotation. (3) The pump speed is too low. The treatment method is to check the rotation speed and increase the rotation speed. (4) The filter screen is clogged and the bottom valve is not working. The treatment method is to check the filter to eliminate debris. (5) Centrifugal pump The suction height is too high, or a vacuum appears in the aspiration tank. The treatment method is to reduce the suction height; check the suction tank pressure.

C. Interruption after pump discharge is caused by the following reasons: (1) Air leakage from the suction line. The treatment method is to check the connection of the suction side pipe and the sealing of the stuffing box. (2) The gas on the suction side is not exhausted when the pump is pumped. The treatment method is to require refilling the pump. (3) The suction side is suddenly blocked by foreign matter. Centrifugal pump The treatment method is to stop the pump to process the foreign matter. (4) Inhale a large amount of gas. The treatment method is to check whether the suction port has a vortex and whether the submerged depth is too shallow.

d. Insufficient flow The reason and treatment are as follows: (1) Same as b, c. The solution is to take appropriate measures. (2) The system has a static head increase. The method of treatment is to check the liquid level and system pressure. (3) Increase in resistance loss. The treatment method is to check the pipeline and the check valve and other obstacles. (4) The wear ring of the housing and the impeller is excessively worn. Centrifugal pump The treatment is to replace or repair the wear ring and the impeller. (5) Leakage in other parts. The treatment method is to check the shaft seal and the like. (6) The pump impeller is blocked, worn and corroded. The treatment method is cleaning, inspection and exchange.

e. Insufficient head and treatment are as follows: (1) (1), (2), (3), (4), c (1), and d (6) of the same b. The solution is to take appropriate measures. (2) Impeller mounted reverse (double suction wheel). The treatment is to check the impeller. (3) The liquid density and viscosity do not match the design conditions. Centrifugal pump The treatment is to check the physical properties of the liquid. (4) The flow rate is too large during operation. The solution is to reduce the flow.


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