Regarding the head of the circulation pump
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On the heating furnace, there are two circulation pumps, one in use and one as a backup; normally only one pump is operated. If both pumps run simultaneously, will this increase the head pressure? Please, teachers, share your thoughts
It will increase flow rate, but not head, unless the two pumps are connected in series.
Pumps in parallel increase flow rate, while those in series increase head pressure; your situation is likely not the case.
Both the spare and the active unit are connected in parallel; starting them simultaneously only increases the flow rate, which will be greater than that of one unit but less than the sum of the flow rates of two units. Series connection can only increase the head, but it results in a head that is greater than that of a single unit yet less than the sum of the heads of two units.
The head increases slightly when operating in parallel, mainly due to the increase in flow rate.
Only increases flow rate, without increasing head.
One pump is in use and one is as a backup; both are connected in parallel. When the flow rate is insufficient, two pumps can be turned on.
Thank you all! Why is the diameter of the pipe at the pump outlet larger than that at the pump inlet?