Thru that section, yes. But, to be clear, the more flow is relative to
the reduction in what comes out the end of the new section owing to the
added pressure differential. There's not going to be more coming out of
the opening into that section than the upstream pressure there supplies.
I read your post too quickly the first time, let me try again at
responding to it:
In the OP's example, he is considering extending his system with
either 3/4" or 1" pipe. So in the two cases we are comparing, the
pipes would be connected to the same source.
You won't get any more flow than the 3/4" pipe would provide at the
point of attachment of the new pipe. But you will get more flow at
the end of the new pipe when the new pipe has lees fricional loss.
Perhaps what you're trying to say? The larger pipe will preserve
whatever flow and capacity is available at the end of the 3/4. But, it
won't increase pressure, or GPM rate.
However, using smaller pipe may reduce the flow, pressure, or GPM.
I'd be concerned that some future plumber might see the larger pipe,
and assume that it was larger, all the way back.
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