Minimum distance from trap to sani-tee

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by techinstructor, Mar 26, 2011.

  1. techinstructor

    techinstructor New Member

    Joined:
    Apr 24, 2009
    Location:
    North Carolina
    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. dlarrivee

    dlarrivee New Member

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    Jun 28, 2009
    Occupation:
    Foam/Fireproofing/Acoustical
    Location:
    Canada
    Generally, double the diameter of the given pipe.
     
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  4. Tom Sawyer

    Tom Sawyer In the Trades

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    Maine
    Twice the diameter of the pipe, elswize you have an S trap
     
  5. Yersmay

    Yersmay Writing, constructionDIY Member

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    Sep 9, 2005
    Occupation:
    writing, construction
    Location:
    Los Angeles
    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.
     
  6. Gsalet

    Gsalet George the Plumber

    Joined:
    Sep 19, 2010
    Location:
    San Francisco
    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
     
  7. techinstructor

    techinstructor New Member

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    Apr 24, 2009
    Location:
    North Carolina
  8. jimbo

    jimbo Plumber

    Joined:
    Aug 31, 2004
    Location:
    San Diego
    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.
     
  9. Redwood

    Redwood Master Plumber

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    Dec 15, 2007
    Occupation:
    Service Plumber
    Location:
    Connecticut
    That would be a crown vent not an s-trap.
     
  10. Winslow

    Winslow Plumber

    Joined:
    Dec 30, 2005
    Occupation:
    Plumber
    Location:
    Hawaii
    Or a crown vented trap if the drain was on the horizontal. Either way it's illegal, at least under the UPC.
     
  11. techinstructor

    techinstructor New Member

    Joined:
    Apr 24, 2009
    Location:
    North Carolina
    Ok, it is illegal in NC too. After posting this I found this in the NC Code:
    Thanks for the responses.
     
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