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# Thread: if i install 1/2" water pipe, as a branch----

1. ## if i install 1/2" water pipe, as a branch----

in 25 feet, will i get the same amount of water,coming out, as i would a 3/4" pipe serving the 1/2" o/s spiggot. This hard water line is backed up off the main by a 35 foot of 3/4"copper. I seem to have less pressure in my hard water line.
? I have a soft and a hard water next to each other /front of house and in back.

What i'm trying to say the lines are 25 feet off a 3/4" main.both are 1/2" i think the hard water line should probably be 3"4" I s this the right thinking?? thanks for any of your time bob s

2. I believe you are confusing pressure with volume or flow. Given equal pressure, you will get more volume of water out of the 3/4" pipe. (Area = Pi x radius squared) Do the math for the two pipes and you will see there is much more area in a 3/4" pipe than a 1/2" pipe. The only way to tell for sure what your pressure is is to use a pressure gauge. Pressure does not change with the diameter of a pipe. Over extreme distance you would have pressure loss because of friction, but it would be insignificant on the distance you are concerned with.

3. There is always psi loss due to friction when water flows through a pipe. A larger diameter pipe has LESS loss. The psi loss increases with volume of flow.

In your situation, the difference would be slightly noticeable, but not extreme.

4. Your faucet, whether 1/2" or 3/4" will have the same 1/4" opening in it, therefore the difference in flow between the two sizes for that length will be insignificant.

5. Originally Posted by hj
Your faucet, whether 1/2" or 3/4" will have the same 1/4" opening in it, therefore the difference in flow between the two sizes for that length will be insignificant.
I hadn't realized how much of this plumbing stuff i have forgotten!! Thanks HJ and all who posted help for me bob s

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