supply line sizing

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by apparentgenius, May 5, 2008.

  1. apparentgenius

    apparentgenius New Member

    Messages:
    21
    Location:
    Oregon
    Hi,

    I am in the process of plumbing a new house with PEX. I have a 1" main coming into the house.

    Is there a limit of how many 1/2" fixture supply lines that I can take off of a a 3/4" branch off of the main? My total fixture units on the second floor is 23 made up of 4 sinks,2 toilets, 1 tub, 2 shower heads 1 washer, 1 dishwasher.
    The distance from the 1" supply line to the furthest fixture is about 30'

    Any help is appreciated.

    glen

    http://www.terrylove.com/watersize.htm
    Last edited by a moderator: Jun 15, 2008
  2. Plumber Jim

    Plumber Jim Member

    Messages:
    92
    That depends on how your local code reads it. here in Denver you can size it as you would copper. They don't like to see that 3/8 stuff. What is you psi ?
  3. apparentgenius

    apparentgenius New Member

    Messages:
    21
    Location:
    Oregon
    Hi Plumber Jim,

    The water company says that my pressure is 65 psi at the meter. If that's the case, can I feed all of that with a 3/4" line? I'm planning on using the 1" copper ported manifolds, 3/4" inlets, 1/2" outlets.

    Thanks,

    glen
  4. patrick88

    patrick88 Plumber

    Messages:
    836
    Location:
    Webster Ma.
    You should not have any problems with your pressure.
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