Minimum distance from trap to sani-tee

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

  1. techinstructor

    techinstructor New Member

    Messages:
    81
    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

    Messages:
    1,172
    Location:
    Canada
    Generally, double the diameter of the given pipe.
  3. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,074
    Location:
    Maine
    Twice the diameter of the pipe, elswize you have an S trap
  4. Yersmay

    Yersmay Writing, constructionDIY Member

    Messages:
    62
    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.
  5. Gsalet

    Gsalet George the Plumber

    Messages:
    83
    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
  6. techinstructor

    techinstructor New Member

    Messages:
    81
    Location:
    North Carolina
  7. jimbo

    jimbo Plumber

    Messages:
    8,997
    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.
  8. Redwood

    Redwood Master Plumber

    Messages:
    7,453
    Location:
    Connecticut
    That would be a crown vent not an s-trap.
  9. Winslow

    Winslow Plumber

    Messages:
    450
    Location:
    Hawaii
    Or a crown vented trap if the drain was on the horizontal. Either way it's illegal, at least under the UPC.
  10. techinstructor

    techinstructor New Member

    Messages:
    81
    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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