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Thread: Minimum distance from trap to sani-tee

  1. #1
    DIY Member techinstructor's Avatar
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    Question Minimum distance from trap to sani-tee

    I've read about maximum distances allowed from the trap to the sani-tee (and vent) but I was wondering if there is a minimum horizontal distance that should be maintained. In other words can the j bend be trimmed to a shorter length if desired? We'd be using 1 1/2" pipe at this location. I also have a 2" trap for the washer that will connect to a sani-tee that will not be in the wall. Is there a minimum length for the pipe coming from the trap to the sani-tee and vent?

    Thanks

  2. #2
    DIY Senior Member dlarrivee's Avatar
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    Generally, double the diameter of the given pipe.

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    In the Trades Tom Sawyer's Avatar
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    Twice the diameter of the pipe, elswize you have an S trap

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    Writing, constructionDIY Member Yersmay's Avatar
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    I posted an identical question sometime ago and got some very interesting answers. I tried lifting the title of that thread and placing it in this post but I'm not sure it worked. At any rate, the thread can now be found in the Code Question forum, UPC. The title of the thread is:

    trap arm question, UPC.

    If I didn't successfully insert a link to my past thread, maybe someone can do that for me.

  5. #5
    George the Plumber Gsalet's Avatar
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    If you can make the connection without cutting into the radius of the trap arm it should be OK, No Minimum sited in the code

  6. #6
    DIY Member techinstructor's Avatar
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    The other thread is at: http://www.terrylove.com/forums/show...m-question-UPC

    I posted the link so to make it easier for others, but I think it just confused me more than it helped. I guess I'll try to follow the 2 x the pipe diameter suggestion, and if that doesn't fit, I'll ask my inspector before going shorter.

  7. #7
    Plumber jimbo's Avatar
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    Since the code says 2 pipe diameters developed length from the weir of the trap to the inner edge of the vent, I think in practical terms, it would be hard NOT to meet that spec.

  8. #8
    Master Plumber Redwood's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    Twice the diameter of the pipe, elswize you have an S trap
    That would be a crown vent not an s-trap.

  9. #9
    Plumber Winslow's Avatar
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    Or a crown vented trap if the drain was on the horizontal. Either way it's illegal, at least under the UPC.

  10. #10
    DIY Member techinstructor's Avatar
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    Ok, it is illegal in NC too. After posting this I found this in the NC Code:
    906.3 Crown vent.

    A vent shall not be installed within two pipe diameters of the trap weir.
    Thanks for the responses.

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