Regarding the switching issue of reciprocating residential water pumps
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What I need to do is first open the test line of standby pump B, then start the standby pump, gradually open the outlet valve of the standby pump, and gradually close the test line, so that eventually the outlet valve is fully open while the test line is completely closed. At this time, pump A is still running; in other words, both pumps A and B are operating simultaneously. Why isn’t there any change in the total outlet flow? Logically, the flow rate should increase when both pumps are running. Also, after switching to pump B, I stopped pump A right away and then closed its outlet valve. Was my sequence of operations correct? Why isn’t there much change in flow rate when the two pumps operate simultaneously? It has to do with the working principle of reciprocating pumps
When pumps AB operate simultaneously, the flow rate should increase as a result of both pumps being in use at the same time. Stop pump A, gradually open the test line for pump A, then close the outlet valve of A, and finally stop the pump. I’m not sure if that’s correct?
Stop the pump – I think it’s sufficient to simply stop it. Although what you mentioned is the correct procedure, I find it too troublesome; given the structure of a reciprocating pump, pressure won’t flow back. Why doesn’t the flow rate increase much when both pumps are running at the same time? Could it be due to a flow-limiting orifice plate?
Theoretically, even with a flow-limiting orifice plate, the flow rate should increase
Is it the pipeline capacity at the entrance that’s the issue?