Cooling after liquid oxygen pump repair
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How is the liquid oxygen pump cooled after maintenance? Is it direct liquid cooling? What are the other precautions when cutting pumps?
It is recommended to use heated gas to purge the pipelines and pumps in order to prevent the presence of impurities and moisture. After thorough purging, the inlet of the oxygen pump can be slightly opened, and reflux can be enabled for pre-cooling – follow your established pre-cooling procedure. When shutting down a pump, start the backup pump; it is best to first enable full reflux, then gradually open the outlet, close the inlet of the pump that is still in operation, and activate the reflux of that pump. By coordinating the outlets and refluxes of both pumps, stability of the operating conditions can be ensured~~
When switching to a standby pump while the pump is in operation, is it necessary to adjust the frequency first and then the outlet and return flow rates? For the pump that is actually in use, is it necessary to adjust the outlet and return flow rates first, and then the frequency?
It can be adjusted in this way~~ to prevent the two pumps from opposing each other, which could lead to cavitation in the standby pump~~
“Open the outlet slowly again, and close the inlet of the running pump”? After full reflux, the outlet is opened again – at this point, what is the state of the variable frequency drive, with it set at its maximum level? And how do I shut off the inlet to the running pump?
Use variable frequency to maintain a high load~~If the automatic transfer switch is reliable, no manual intervention is needed~~If the pump is switched off manually, slowly close the outlet control valve of the operating pump~~Of course, some processes do not have such a valve; in those cases, variable frequency and recirculation are used for adjustment~~