How to extend the service life of horizontal multistage centrifugal pump?

The standard operation and daily maintenance of any mechanical equipment will affect its service life. As a high-pressure pump, the horizontal multistage centrifugal pump is no exception. What should be done to extend the service life of the horizontal multistage centrifugal pump? In this article, HNYB, a multistage centrifugal pump manufacturer, summarizes the following methods. If you use them according to these methods, you can effectively extend the service life of the horizontal multistage centrifugal pump.

1. Preparation before starting:

Before starting the pump, the pump should be fully inspected, especially the newly installed or overhauled pump. The inspection content includes the flexibility of the unit rotor, the state of the bearing oil, the opening and closing of the gate valve on the outlet pipe, whether the bolts connecting the motor and the pump are loose, whether there are debris in the water inlet, whether the direction of the motor and the pump is consistent, whether the control system is normal, etc.

2. Water diversion start:

Water must be diverted before starting the centrifugal pump. Small pumps usually use the method of filling and exhausting water, while large and medium-sized pumps may use the method of water ring vacuum pump to pump air and water. When starting, the brake should be closed and the readings of the pressure gauge and vacuum gauge should be paid attention to to ensure that the pump is pressurized normally.

3. Operation management:

During the operation, attention should be paid to whether the sound and vibration of the pump are normal, whether the bearing temperature and oil volume are appropriate, whether the stuffing box drips, whether the coupling and bolts are offset or loose, and the changes in the instrument pointer.

4. Stop operation:

Before stopping, the vacuum gauge and pressure gauge valve should be closed first, and then the gate valve of the pressure pipeline should be slowly closed to implement closed parking. After parking, the surface of the pump and motor should be cleaned, and the accumulated water in the pump casing should be drained to prevent freezing and cracking when not used for a long time or in winter.

5. Maintenance:

Regular maintenance work should be carried out, including inspection and replacement of lubricating oil, inspection of the sealing performance of the pump, cleaning of the pump interior and inspection of the mechanical parts of the pump.

6. Select a suitable pump:

Select a suitable pump according to the characteristics of the conveyed liquid, check the required performance, and analyze the suction and discharge conditions.

7. Installation precautions:

When installing flexible expansion pipe accessories on the discharge pipe of the pump, ensure that the flanges at both ends are fixed to avoid pipeline stress affecting the normal operation of the pump. The water ring vacuum pump is used for pumping air and water. When starting, the brake should be turned off and then started, and pay attention to the readings of the pressure gauge and vacuum gauge to ensure that the pump is pressurized normally.