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Causes and Prevention of Vibration of Centrifugal Slurry Pump (Part 3)

Jul. 24, 2020

Three. Prevention and treatment of pump vibration

The vibration phenomenon of the Slurry Pump for metallurgical will not disappear, but will only be slowed down by effective treatment measures. For the slurry pump to ensure the long-term stable operation of the pump, it is more reasonable and more standardized At the same time, vibration is a double-edged sword that can not only cause more serious failures but also can promptly discover and diagnose equipment problems according to the changes in the pump vibration.

1 Model selection; the working conditions and working environment of the slurry pump are generally harsh, so the failure rate of the slurry pump is often also relatively high, which requires the use of higher specifications as much as possible on the premise of meeting the production technical requirements Equipment but also to ensure a good working environment in the feed.

2 Operation: The centrifugal pump will produce some cavitation during operation, especially in the case of insufficient feed, the cavitation of the centrifugal pump will be aggravated, and the vibration of the pump will be aggravated at the same time, the vibration caused by cavitation in a short time Because of the uneven distribution of the liquid in the pump cavity, the vibration of the pump can be effectively eliminated by stabilizing the feed of the centrifugal pump or adjusting the speed of the outlet valve pump, but long-term cavitation will cause uneven damage to the impeller. Unadjustable vibration.

Centrifugal Slurry Pumps

Centrifugal Slurry Pumps 

3 Lubrication: Lubrication must not only consider the oil level and quantity of the lubricating oil, but also consider the viscosity of the lubricating oil. When the lubricating oil viscosity is insufficient, centrifugal slurry pumps will also vibrate. When the centrifugal pump is running The temperature of the bearing box will rise, and the viscosity of the lubricating oil will decrease when the temperature rises. Therefore, when checking the oil level and oil volume of the equipment, ensure that the temperature of the equipment is within the appropriate range. When the temperature of the equipment rises, it is necessary to find out the cause in time, otherwise it will also cause vibration and damage to the bearing due to poor lubrication.

4Tightening: The bolts will loosen in the "micro-vibration" state. When reinstalling after maintenance, apply some thread locking agent on the bolts, which can prevent the bolts from loosening and damage. The loosening agent can be melted by heating. Although the investment is small, it is essential for equipment reinstallation.

5 Stable feeding: Regarding the stability of the feeding, it is a problem during the selection and installation. However, the precipitation, scarring, and blockage of large particles in the slurry after use will cause the feeding process to fail to meet the slurry pump This requires cleaning of pipes and valves. In addition, when controlling the flow, it is best to reduce the operating frequency of the slurry pump. Again, adjust the outlet valve. You cannot control the flow by adjusting the inlet valve.

The occurrence of equipment failures often starts from abnormal vibrations that are not easily detectable and continues to aggravate. In the process of failures, there are many places that need to be summarized and analyzed. Abnormal vibrations are both a failure and a failure. An important reason for aggravation. Analyzing abnormal vibration is a method of diagnosing faults. If equipment failures cannot be handled in time according to the vibration of the equipment, it will cause a vicious circle. The more severe the vibration, the more failures will occur, and the more failures, the more equipment will vibrate. serious.

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