Pumps connected in Parallel
Pumps connected in Parallel
(OP)
Hi All,
I have installed two submersible pumps of same make and specification in a tank and connected the discharge of both of them to a common header. I want to know what will be the pressure at the header if the pump discharge pressure is 2 bar. Whether the pressure in the header remain 2 bar itself or will it increase?
Thanks in advance.....
I have installed two submersible pumps of same make and specification in a tank and connected the discharge of both of them to a common header. I want to know what will be the pressure at the header if the pump discharge pressure is 2 bar. Whether the pressure in the header remain 2 bar itself or will it increase?
Thanks in advance.....





RE: Pumps connected in Parallel
centrifugal pumps connected in parallel will produce the same head and hence the dicharge pressure for both pumps will be the same. Assuming there are no elevation changes the header pressure can never be greater than the indivisual pump pressure.
RE: Pumps connected in Parallel
RE: Pumps connected in Parallel
Do you wish to increase the header pressure?
Is 2 bar the discharge pressure when one pump is running?
Do you wish to run both pumps to increase the header pressure?
Please provide more details.
RE: Pumps connected in Parallel
Johnny Pellin
RE: Pumps connected in Parallel
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Pumps connected in Parallel
...also important to know for best possible pump result: connection and pipeline layout including dimensioning of pipelines and placement of checkvalves.
Two pumps in parallell can give as a result the one pump giving higer pressureresistance for the other, than for the first. Result: uneven load, wear and pumped amount. [But total pressure not more than 2 bar)
RE: Pumps connected in Parallel
The pumps will pump where they each intersect the system curve. Please note of the following:
RE: Pumps connected in Parallel
When selecting pumps suitable for parallel pumping, I think of two important considerations:
1. Make sure none of the performance curves are "drooping", i.e. head never decreases moving towards shutoff.
2. Curves should be somewhat "steep", i.e. minimum 10% head rise to shutoff from BEP.
RE: Pumps connected in Parallel
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