Drain Volume

Discussion in 'Shower & Bathtub Forum & Blog' started by Hammy, Dec 7, 2011.

  1. Hammy

    Hammy In the Trades

    Joined:
    Dec 7, 2011
    Occupation:
    Kitchen & Bath Makeovers
    Location:
    Middle TN
    We are installing body sprays in a shower and I am concerned about the drain capacity. The shower control valve can supply 9 gpm @ 90 psi. The city reports the supply is normally at 65 to 80 psi static pressure. Drain is a 2" pvc line assuming properly installed.

    Hammy
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    One drain at 2" should be able to handle it - just don't stand on the drain cover for long! My tub drain is 1.5", and on full-blast, the tub drains faster than the incoming water...a 2" drain is a lot bigger in area/volume. If you're really worried, they do make 3" drains, or you could put two 2" ones in or a linear drain, but ensure the underneath plumbing is big enough, otherwise, it won't make any difference.
     
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