Drain Volume

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

  1. Hammy

    Hammy In the Trades

    Dec 7, 2011
    Kitchen & Bath Makeovers
    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.

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    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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