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This post was last edited by Dreamwalker on 2019-6-8 20:03. Hello everyone. We
I took a look at your flowchart before answering your question.
Open empty and compress within 42,000.
Is it a circulating argon pump? Is it still the product argon pump? The pump reversal operations are more or less the same~~ Also, each pump is equipped with its own return pipeline, right? It’s best to be able to achieve full reflux, as this facilitates pump switching. The basic procedure is to ensure the standby pump is properly pre-cooled, keep the outlet closed or slightly open, have reflux at full capacity, start the pump, and then gradually increase the frequency control, adjusting it so that the pressure at the pump outlet remains stable and cavitation does not occur. Combined with opening the outlet and closing the return flow (for the main pump, the outlet is closed while the return flow is opened; operation stops when the outlet is almost completely closed)~~
It is a circulating liquid argon pump, which pumps liquid argon from Tower 1 to Tower 2 and then returns it to the main tower. Thank you.
Our standby pump operates at low load with the outlet fully open, and it has a separate return line. A few days ago, during pump reversal, both pumps suffered from cavitation; as a result, the fine argon column and the crude argon column were taken out of service, both pumps stopped operating, and liquid discharge was heated. So I’ve come here to ask everyone for advice.
Pump cavitation is mostly caused by insufficient cooling; it is possible to cool the standby pump before switching it over. Additionally, the switch-over process must be carried out smoothly to maintain stable outlet pressure.
Cavitation in the standby pump occurs because the main pump reduces pressure and speed too slowly, the backflow valve of the standby pump closes too quickly and prematurely, and the liquid level in the standby pump cannot be discharged, resulting in pump cavitation.