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The manifestation and maintenance method of centrifugal pump failure

Data: 2021-01-07

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The manifestation and maintenance method of centrifugal pump failure

As a common type of pump, centrifugal pumps are widely used in industry and agriculture because of their high speed, small size, light weight, high efficiency, large flow, simple structure, stable performance, easy operation and maintenance, etc. With the continuous development of industry and agriculture, the requirements for centrifugal pumps are still rising. 

Centrifugal water pump is a common medium conveying equipment, which is particularly important for the production of some chemical plants with strong continuity. During the operation of the centrifugal pump, various failures will inevitably occur. The main manifestations and emergency maintenance methods are as follows:


1. The pump cannot be started or the starting load is large


The possible causes and treatment methods are as follows: 

(1) The prime mover or power supply is abnormal. The treatment method is to check the power supply and prime mover. 

(2) The pump is stuck. The treatment method is to check the coupling by rotating it by hand, disassemble it if necessary, and eliminate the malfunction of the moving and static parts. 

(3) The packing is too tight. The treatment method is to relax the filler. 

(4) The discharge valve is not closed. The treatment method is to close the discharge valve and restart. 

(5) The balance tube is not smooth. The treatment method is to dredge the balance pipe.

centrifugal pump by Paragon

The pump does not discharge liquid


The possible causes and treatment methods are as follows:

(1) Insufficient filling of the pump (or the gas in the pump is not exhausted). The treatment method is to refill the pump.

(2) The pump steering is wrong. The solution is to check the direction of rotation.

(3) The pump speed is too low. The solution is to check the speed and increase the speed.

(4) The filter is blocked and the bottom valve is not working. The treatment method is to check the filter to eliminate debris.

(5) The suction height is too high, or there is a vacuum in the suction tank. The treatment method is to reduce the suction height; check the suction tank pressure.

The pump is interrupted after draining


The possible causes and treatment methods are as follows:

(1) Air leakage in the suction pipe. The treatment method is to check the suction side pipe connection and the sealing condition of the stuffing box.

(2) The suction side gas is not exhausted when filling the pump. The solution is to refill the pump.

(3) The suction side is suddenly blocked by foreign objects. The treatment method is to stop the pump to handle the foreign body.

(4) Inhale a lot of gas. The treatment method is to check whether the suction inlet has vortex and whether the submerged depth is too shallow.
Corrosion resistance centrifugal pump for sale

The head is not enough


The possible causes and treatment methods are as follows:

(1) The impeller is reversed (double suction wheel). The solution is to check the impeller.

(2) The density and viscosity of the liquid do not match the design conditions. The treatment method is to check the physical properties of the liquid.

(3) The flow is too large during operation. The solution is to reduce the flow.

Insufficient flow


The possible causes and treatment methods are as follows:

(1) The static head of the system increases. The treatment method is to check the liquid height and system pressure.

(2) The resistance loss increases. The treatment method is to check obstacles such as pipelines and check valves.

(3) The casing and the wear ring of the impeller wear too much. The treatment method is to replace or repair the wear ring and impeller.

(4) Leakage in other parts. The treatment method is to check the shaft seal and other parts.

(5) The pump impeller is blocked, worn, and corroded. The treatment method is cleaning, inspection and replacement.


High power consumption during operation

The reasons and treatment methods are as follows:

(1) There is abrasion between the impeller and the wear ring, the impeller and the shell. The treatment method is to check and repair.

(3) The density of the liquid increases. The solution is to check the density of the liquid.

(4) Packing is pressed too tightly or dry friction. The treatment method is to loosen the filler and check the water seal pipe.

(5) The bearing is damaged. The treatment method is to check and repair or replace the bearing.


Paragon is a professional  centrifugal pumps supplier. If you have any related questions, please consult us, and professional technicians will answer you.