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Thread: what is maximum drain pipe length allowed

  1. #1

    Question what is maximum drain pipe length allowed

    I have a laundry tub that sits 1 1/2 feet from a vent stack. The tub currently is one of those concrete two section tubs. I'm removing it and replacing with a single resin tub.

    The current drainage for the tub is directly into the vent stack with a P trap.

    The bottom of the new tub sits higher than the old concrete tub, so I want to extend the drain pipe out of the bottom of the new tub, into the P trap, so the horizonatl pipe off the P will enter the vent at a near horizontal position, (as I understand it must).

    I am wondering how long of a drain pipe is allowed. I think I need about a 10" drain pipe, which would put the bottom of the P trap pipe at approx 6 " off of the floor.

    Is there any code issue with having a 10 " drain pipe, and for having the P trap as close as 6" to the floor?

    T-roy

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default trap

    I am not sure I understand the question, because the "P" traps elevation should not change. You can use up to an 18" long tailpiece between the sink and the trap.

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