Quote:
Originally Posted by FSR402
Got it. Now he question would be would the pick-up tube and ball valve be able to feed the two pumps? If not then no gains.
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Quote:
Originally Posted by FSR402
are you talking about hooking up the out of one to the in of the other? What would be the point of that? The pump can only flow so much and you would be limited by the hoses, the ball valves and the first pump anyways.
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For similar centrifugal pumps with similar plumbing, whether in series or parallel, no matter the size of the the input and output, there would be flow gains (as long as the head height is below the max head of a single pump). Maximizing the flow gains is a different matter.
Pumps in series can yield a higher pressure, and pumps in parallel can yield higher flows. If you don't need pressure (low head height), the parallel pumps will give more flow. If you need pressure, the series pumps will provide more flow. Picking which setup to use is system dependent based on comparing head height vs. flow- as head height increases, the flow rate for the pumps in parallel flow rate will decrease below the flow rate for the pumps in series.
The input/output restrictions are a separate but related issue. Basic principles of decreasing flow restriction on the input and output apply to both series and parallel, but are more critical on for parallel. To maximize the parallel setup, the outputs should remain separate until termination or be combined into a larger pipe. The effect of increasing restrictions in the lines is similar to increasing head height.