Centrifugal pump issues

Centrifugal pumps experience severe vibration problems when the outlet is closed, as the liquid inside the pump cannot flow out. When the hydraulic pressure stops, the liquid inside the pump creates a high-pressure area, while the impeller continues to rotate. This results in a pressure difference between the high-pressure and low-pressure areas, thereby causing vibration in the pump. Generally, the greater the vibration level of a pump, the shorter its lifespan will be. When the outlet is opened to the rated flow rate, the liquid inside the pump can flow out smoothly, resulting in a favorable flow pattern that reduces the pump’s vibration levels. At this time, the vibration of the pump mainly depends on factors such as the pump’s structure and the design of the impeller. Therefore, it can be said that the vibration level of the pump when the outlet is closed is much higher than that when the outlet is open at the rated flow rate. To prevent this from happening, it is usually necessary to install a pressure valve at the fluid outlet in order to release pressure when the pump stops, thereby reducing the vibration of the pump. At the same time, when designing and selecting centrifugal pumps, factors such as the pump’s structure and impeller design also need to be taken into account in order to reduce pump vibration. .

This post was last edited by CHANGBAISHI on 2023-5-9 06:24. It’s better to specify the issues more clearly, as the operating conditions for centrifugal pumps vary. Such as saturated or supercooled liquids, liquid density, pressure, etc. In the initial stage of startup, the vibration of a regular room-temperature water pump should be below the levels observed during normal operation. When it operates for too long, the water temperature inside the pump rises, which can affect the proper functioning of the pump. For liquid pumps handling saturated liquids, improper startup or overpressure issues can occur; however, due to the varying operating conditions, it is not possible to make generalizations. Furthermore, factors such as the different assembly parameters of each pump and varying operating conditions also mean that it is not possible to make generalizations. It is best to analyze and address issues in a targeted manner, as vibrations caused by mechanical or manufacturing processes need to be treated differently. For reference.