How to prevent pump cavitation during startup?
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During the commissioning of a unit, the processing capacity is often low, which results in low flow rates in the pumps. Pumps with low flow rates are prone to cavitation. What are the methods available to prevent cavitation? I have personally summarized two points: 1. Consider the load-bearing capacity of the pumps at the minimum processing volume during the design process; 2. Generate more backflow. Do you all have any better suggestions? Let’s all share
Which pump is it in which part of the process? Raw material pump, reflux pump, bottom of tower pump, plant discharge pump?
Note the time required to start up the pump; it is essential to drain it thoroughly, preferably by releasing air from the highest point at the pump’s outlet, so that all air is removed. This is especially important for pumps with high requirements, such as high-speed pumps and multi-stage pumps. Also, pay more attention to the net positive suction head of individual pumps, and make sure to clean the filters regularly, especially at the start of operation when there is a lot of debris in them. Slag, sealing oil for transportation, and things like that.
Another way to prevent the pump from running dry is to include a straight pipe section before the inlet, as well as a level gauge; the pump will stop operating when the liquid level drops, which makes things much simpler
2# xlxuiin, please tell me all the methods to prevent these pumps from running dry. I’m a beginner; thank you very much
I agree with what was said on the 3rd floor regarding the time required to start up the pump. It’s necessary to ensure thorough exhaust of air from the pump; it’s best to drain the air from the highest point at the pump’s outlet, so that exhaust is complete. However, some pumps are designed with improperly arranged exhaust valves, which makes it difficult to expel air. When conditions permit, I remove the pressure gauge located at the higher position in order to facilitate exhaust. It also depends on the design aspects of the manufacturing process to see if it can meet the requirements; our factory has people who are available on an irregular basis over the long term.