What to do about pump cavitation
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Can gasoline pump cavitation be resolved during operation, without shutting down or stopping the pump?
Is this problem inherent, or is it caused by improper operation? If it is the latter, it can be resolved through appropriate actions; if the design or selection was improper in the first place, then it is necessary to redesign and select anew
If the selection is inappropriate, it must be redesigned.
This post was last edited by Zhongyuanren on 2016-1-11 08:04. Problem solved: 1. If the wrong model is selected, it cannot be processed online； 2. If venting is not done before starting the pump, the pump must be stopped to carry out venting ； 3. If there are no such problems, the inlet pressure can be increased ； Reduce inlet temperature ； Increase the level of liquid in the imported tank
Cavitation generally occurs when: NPSHa ≤ NPHSr + 0.5. Reducing the NPSHr value is possible, but NPSHr is related to the pump’s design; it is recommended to choose a pump with a lower NPHSr value； II: Increasing the NPSHa value can be achieved through the following methods: ① Increasing the pressure at the suction inlet; ② Raising the liquid level at the suction inlet; ③ Shortening the pipeline leading to the pump inlet; ④ Enlarging the diameter of the inlet pipeline; ⑤ Closing the outlet valve to reduce flow rate; ⑥ Reducing unnecessary bends and valves in the inlet pipeline; ⑦ Lowering the inlet temperature to decrease the saturated vapor pressure. These are the possible solutions; please choose the appropriate one based on the actual conditions of the equipment.
If it’s completely online, the only thing to do is to keep the inlet valve open and try reducing the outlet valve slightly; if there’s a filter at the inlet, replace it. If there is a container at the inlet, raise the liquid level inside the container
In the event of an emergency, it may be caused by factors such as water in the high-temperature medium, a clogged inlet filter, low inlet pressure, or excessive flow rate.
What was said upstairs is absolutely correct; in case of an emergency, stopping the pump should suffice to resolve the issue. It is mainly external factors that cause problems, and the liquid level in the inlet tank is also an important factor that needs to be taken into consideration.
There are many reasons for cavitation in gasoline pumps; when the pump is not running, efforts should be made to reduce the temperature of the gasoline entering the pump in order to minimize cavitation
It’s best not to do it, as the negative effects of pump cavitation are severe; in some cases, the pump may need to be replaced. It is recommended to shut down the pump, refill it before restarting it, or improve the process to avoid cavitation~~
First, we need to find the cause of cavitation: the medium temperature and the conditions at the pump inlet. . . . . . The problem can only be solved by identifying the correct cause; a liquid guiding tank can be installed on the pump inlet pipeline, as well as cooling systems for storage tanks and pipelines