Operation method of the monomer feeding pump (canned motor pump)
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Why is the outlet valve of the single-unit feed pump (caged pump) in my unit always open? Senior colleagues, could you explain why this is the case? (For normal pump operation, the pump is started first, and then the valve is opened.)
Our approach here: Process: tank – cut-off valve – filter – pump – check valve – (valve) – polymerization cut-off valve – storage tank. The valves here are open to facilitate handling during the vaporization of vinyl chloride and to make it easier to start the pumps；
Do other factories do the same thing?
The key is to understand the structure of the shielded pump; minor technical modifications can be made under conditions that permit operation, in order to ensure proper maintenance and operation； Chloroethylene shielded pumps are primarily vulnerable to failure caused by cavitation, which can severely damage the rotor and casing
It’s troublesome to remotely control switches and valves, right? It should also be a small pump; with a low flow rate, the motor won’t get overloaded
With program automation, the outlet valve does not open, there is no flow, and the program cannot proceed.
Start the pump first and then open the valve; this is the proper way to operate it. You can think about why this is done! What was said upstairs is correct – it’s necessary to prevent a lack of monomer inside the pump, as well as cavitation, which can damage the pump. As long as there is something inside the pipeline to ensure the pump operates properly, that’s enough! So it is also necessary to check whether the pump’s installation on-site meets the startup requirements! !