Common Faults and Maintenance of Multistage Centrifugal Pump

Category: Water pump knowledge

2024-04-18

The maintenance of multi-stage centrifugal pump is an important work to ensure the normal operation and prolong the service life of pump equipment. The maintenance work requires professional skills and experience to ensure the safety of operation and maintenance quality. Multi-stage pump is one of the common pumps. It is a centrifugal pump combined with a pull rod. The biggest feature of this pump is that it can produce very large pressure, mainly through the rotation of the impeller to generate huge centrifugal force. There will always be some minor faults in the use of the multi-stage pump for a long time. If there is a fault, it needs to be repaired. The manifestations of the fault are still very diverse.Hunan Sanchang Pump Co., Ltd.This paper introduces the fault and maintenance of multi-stage pump for you. Interested users will take a look at it together.

多级离心泵常见的故障与维修

First of all, before carrying out maintenance work, you must carefully read and understand the operation manual and maintenance manual provided by the manufacturer to understand the structure and working principle of the pump. During the maintenance process, the operation should be carried out in strict accordance with the requirements of the operation manual to avoid equipment damage or personal injury caused by illegal operations.

Secondly, the key to the maintenance of multi-stage centrifugal pumps is the inspection and replacement of pump components. During the maintenance process, the wear of key components such as impellers, bearings, and seals should be carefully checked. If there is wear or damage, it should be replaced in time. At the same time, the impurities and deposits inside the pump should be cleaned to keep the pump clean. Maintenance personnel need to have good maintenance skills and tools to ensure the accuracy of replacement parts and the efficiency of operation.

In addition, after the maintenance is completed, comprehensive testing and inspection should be carried out to ensure that the pump equipment can operate normally after maintenance. The tests include pump start and stop tests, as well as pump performance tests. Performance testing can evaluate the quality of maintenance by comparing the differences between the flow, head and efficiency of the repaired pump and the design parameters. If it is found that the test results do not meet the requirements, further adjustment and correction are needed until the design requirements are met.

Common faults and corresponding maintenance suggestions are as follows:

1. The multi-stage pump cannot be turned on

Cause: Check whether the motor and power supply are connected normally, and then check whether the pump has problems with the main card or other auxiliary equipment.

Treatment method: if the pipeline pump is stuck, check the coupling to see if it is normal, and if necessary, remove the pump for inspection. In addition, the medium pressure in the pump body can be considered to be too large and can be tried to relax through the exhaust procedure.

2. Multi-stage pump does not produce water

Causes: the pump body and suction pipe are not filled with water; the dynamic water level is lower than the water pump filter pipe; the suction pipe is broken, etc.

Treatment method: eliminate the fault of the bottom valve and fill the diversion water; Lower the installation position of the water pump so that the filter pipe is below the dynamic water level, or the filter pipe is pumped again when the dynamic water level rises. Repair or replace the suction pipe.

3, multi-stage pump power consumption is too large

Causes: multi-stage pump speed is too high; multi-stage pump spindle bending or pump spindle and motor spindle is not concentric or parallel; selection of pump head is not appropriate; pump suction sediment or blockage; motor ball bearing damage.

Treatment method: check the circuit voltage and reduce the speed of the multi-stage pump; correct the pump spindle or adjust the relative position of the pump and the motor; select the pump with the appropriate head; clean up the sediment or blockage; replace the ball bearing of the motor.

4. Severe vibration or noise of multi-stage pump body

Cause: multi-stage pump installation is not firm or too high installation; motor ball bearing damage; spindle bending or with the motor spindle is not concentric, not parallel, etc.

Treatment method: install stable water pump or reduce the installation height of the pump; replace the ball bearing of the motor; correct the bent spindle or adjust the relative position of the pump and the motor.

5. The transmission shaft or motor bearing of the multi-stage pump is overheated

Cause: lack of lubricating oil or bearing rupture.

Treatment method: add lubricating oil or replace the bearing.

6. Insufficient flow of multi-stage pump

Causes: The insufficient flow rate of the multi-stage pump is mostly caused by air leakage in the suction pipe and air leakage in the bottom valve. The water inlet is blocked; The water inlet of the bottom valve is not enough; The speed of the water pump is too low; The sealing ring or impeller is worn too much; The water absorption height exceeds the standard, etc.

Treatment method: check the suction pipe and bottom valve to block the leakage gas source; Clean up the silt or blockage at the water inlet; The water inlet depth of the bottom valve must be greater than 1.5 times of the diameter of the water inlet pipe, and the water inlet depth of the bottom valve should be increased. Check the power supply voltage, increase the pump speed, and replace the sealing ring or impeller; Lower the installation position of the pump or replace the high-lift pump.

To sum up, the maintenance of multi-stage centrifugal pump is a complex and important work, which requires maintenance personnel to have professional skills and rich experience. Only through correct operation and maintenance can the safe and reliable operation of the pump equipment be ensured and the service life of the equipment be extended. At the same time, regular maintenance and maintenance is also essential to prevent failures and reduce the number of repairs to ensure the continuity and stability of production equipment.

Previous: Multi-stage pump irrigation diversion method, maintenance method

Next: How to choose a multistage centrifugal pump manufacturer

Contact Us

Free Hotline:+86 18142662779

Fixed telephone:+86 19313001794      

Mobile:+86 18142662779(WeChat/WhatsAPP)

E-mail:info@sanchangpump.net