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Old 10-12-2015, 08:27 AM   #1
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Calculating flow from one pipe size into another (radiant manifolds)


I have a general question regarding flow rates for pipes of varying diameters. Suppose I have a pipe that is 3/4" PEX that splits into 5 smaller pipes, say 1/2" PEX. How do you calculate the flow rate for the smaller pipe?

Here's a diagram:


I would prefer to have a formula or to understand how to make this calculation rather than just an answer to my specific example above.

Thank you in advance.
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