You left out two very important things Jabs.
1. How long is the pipe run?
2. What pressure drop can you put up with?
Some secondary factors affecting flow throug pipes are the roughness of
the inside wall of the pipe and whether the flow is low enough to avoid
The first table on this page (even though it is for plastic pipe)will
probably get you close enough if you plug in your numbers for pipe
length and the pressure drop you are willing to accept. And, you'll need
to convert pressure from "feet of head" to PSI as they tell you.
That last comment I made referring to "feet of head" is applicable if
the elevation at the ends of the pipe run are different, like if the
pipe is delivering water from ground level up to the third floor of a
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