Aquapex flow/pressure rates vs copper

btuser Posted By btuser, Aug 14, 2010 at 1:18 PM

  1. btuser

    btuser
    Minister of Fire

    Jan 15, 2009
    2,070
    249
    Loc:
    Principality of Pontinha
    Just looking for verification. I'm re-routing the cold water lines that feed my indirect DHW and want to avoid losing any pressure. About 60' total line will be added. Original line is 3/4" copper, so should I upsize to 1" auquapex or would 3/4" be fine? If it was the crimp-style fittingings I would just do it but something tells me because of the expansion fittings I'd be fine with 3/4" and wouldn't gain anything with upsizing. Max flow is probably about 5gpm so its well within the limits for both 3/4" copper and aquapex.
     
  2. btuser

    btuser
    Minister of Fire

    Jan 15, 2009
    2,070
    249
    Loc:
    Principality of Pontinha
    Well, let me post my own reply:

    Copper vs Pex : Pex has about 75% the interior volume of the same size copper, so a 3/4" pex line will hold about 3/4 the volume of a 3/4" copper pipe. However, because of the lack of fittings with pex vs copper, the maximum speed/flow rate for pex is almost double that of copper pipe before you start to eat away at the inside of the piping. Copper is bigger but a lot of twists/turns even it out.
     
  3. BucksCoBernie

    BucksCoBernie
    New Member

    Oct 8, 2008
    450
    1
    I swapped out all of my copper lines with pex and didnt notice a difference in pressure. The only difference is Im not down in the basement fixing a pinhole leak once a month! Well water and 60yr old copper pipes arent a good combo.
     

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