Discussion on knowledge issues related to shielded pumps in WeChat
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An article published on HaiChuan Chemical Network’s WeChat account on Tuesday, titled “Knowledge about canned pumps – everything you need to know,” includes a paragraph in the section on considerations for selection that states, “When starting a canned pump, it is essential to follow the correct sequence for opening the outlet valve and the inlet valve. When shutting down the pump, first reduce the flow through the outlet valve; once the pump has stopped running, then close the inlet valve before closing the outlet valve.” ” The operation steps for a shielded pump that I know are: to start the pump, open the inlet valve fully, vent the pump to fill it with fluid, start the pump in operation, and then open the outlet valve ； Stop the pump: Fully close the outlet valve, shut off the minimum return line and exhaust line, stop operation, and close the inlet valve. Let’s all discuss: what should be the standard operating procedures for starting and stopping a shielded pump? What damage can differences in operating procedures cause to the pump?
It’s the same in all cases; the main thing is to avoid running the shielded pump at a low flow rate for extended periods of time. It doesn’t matter whether the pump outlet is completely closed or not.
They’re more or less the same; in high-pressure situations, the outlet can be left slightly open when stopping the pump.
The operation steps for a shielded pump that I know are: to start the pump, open the inlet valve fully, vent the pump to fill it with fluid, start the pump in operation, and then open the outlet valve； Stop the pump: Fully close the outlet valve, shut off the minimum return line and exhaust line, stop operation, and close the inlet valve. No problem.