Fitting for change in direction

Discussion in 'Plumbing Code Questions' started by yan2hua, Apr 3, 2012.

  1. yan2hua

    yan2hua New Member

    Messages:
    10
    Location:
    Michigan
    Hi,
    See the attached plumbing codes, 2006 IPC allow Wye & 1/8 Bend for Horizontal to Vertical connection and 2009 NSPC doesn't allow. Does any one know if 2009 IPC has changed this ?
    Thanks

    Attached Files:

  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,270
    Location:
    Cave Creek, Arizona
    The TYPE of horizontal to vertical connection is what determines whether the combo or a Yand 1/8 bend can be used. In either case, if the horizontal line is a "trap branch" without an intevening vent, it REQUIRES the sanitary tee or fixture fitting, otherwise you can use any fitting you want to. Note #2 of the UPC and Note "C" for the IPC cover this. THe codes are a "minimum standard", but you can exceed them if desired, as long as you do not violate a "mechanical limitation" for its use.

    Here is a nice link to Bert Polk's plumbing tips
    Last edited by a moderator: Apr 5, 2012
  3. yan2hua

    yan2hua New Member

    Messages:
    10
    Location:
    Michigan
    One case is: see the attached drawing, 1-1/2" vertical PVC 6 feet up to a grill box with a Mini Studor on the top, only one kitchen sink, what kind of connections will meets the code. Also please see the drawing, is that all the fig meets the code. Is this configuration meets the code.jpg
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Isn't a " wye + 1/8 bend" the same as a "45º elbow + 45ºwye"

    Note that neither of those, or the LR combo, can be used to connect a trap arm.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    14,782
    Location:
    Bothell, Washington
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,270
    Location:
    Cave Creek, Arizona
    WHERE the vent is in relation to the trap and its connection to the plumbing system determines which fittings will be acceptable. IF the vent were in the horizontal trap arm, BEFORE it connected to the vertical pipe, then you could use any fitting you wanted t to connect it. But in your picture the vent is AT the connection, therefore only a sanitary tee, or back to back fixture fitting for two sinks, would be acceptable. A Y-1/8 bend is usually a single fitting called a "combination" or combo for short. An 1/8 bend with a Y, ( or a Y and separate 1/8 bend), does the same thing, but gives a degree of flexibility while taking up more "space".
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