Vent toilet with San-T??

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Hammerlane, Apr 3, 2013.

  1. Hammerlane

    Hammerlane Member

    Messages:
    252
    Location:
    Ohio
    Can a San-T be used like in photo "A" to vent a toilet or is that considered a flat vent?

    Or does a wye and a 45 need to be used like in "B"?

    Attached Files:

    Last edited: Apr 3, 2013
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,831
    Location:
    Cave Creek, Arizona
    It is not "considered" a flat vent, because it IS a flat vent. The Y/45 is the approved way. You have to install the Y low enough so that the vertical pipe gives you the proper clearance for the toilet.
  3. Hammerlane

    Hammerlane Member

    Messages:
    252
    Location:
    Ohio
    OK for being what it IS.

    Photo "B" was just for reference from Bert K's Lincoln County Plumbing handout
  4. jm66208

    jm66208 Member

    Messages:
    99
    Location:
    KC
    How long can the drain line be before It needs a vent? I have never seen a toilet drain line with a vent. Although most I see are just a couple feet away from the stack.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,831
    Location:
    Cave Creek, Arizona
    quote; I have never seen a toilet drain line with a vent.

    I have NEVER installed a toilet drain line WITHOUT a vent. The real question is "How long can a drain line be until the vent is connected", since good codes say it ALWAYS needs a vent.
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,143
    Location:
    New England
    The max distance to a vent is determined by the size of the drain line, the overall design, and how the fittings are installed. Since the drain line needs slope, on a larger pipe, you can go further and still expect there to be an air path above the waste, so that distance is longer. That distance depends on which codes are used where you live. One would expect them to be similar, but they apparently make some assumptions and are more lenient on some than others.
  7. Terry

    Terry Administrator Staff Member

    Messages:
    15,130
    Location:
    Bothell, Washington
    And would that be a vent above the santee?

    If you don't know how and why plumbing functions, it may just look like pipes going here and there. There is a science to the design of a system.

    [​IMG]

    Can you tell wich parts are waste and which are vents? And then add in trap arms.
  8. jm66208

    jm66208 Member

    Messages:
    99
    Location:
    KC
    Yes, poor choice of words on my part. What I meant to say is that typically I see toilet drain lines with a 4" trap arm no longer than about 4-6' that drain into a 4" vertical stack that goes up through the roof. In this situation, I never see the trap arm vented.
  9. Terry

    Terry Administrator Staff Member

    Messages:
    15,130
    Location:
    Bothell, Washington
    A santee and trap arm is good for six feet on a toilet, assuming that the pipe above the santee is a vent.

    No waste can run down the vertical stack from above unless the toilet is vented before it hits the stack.
  10. jm66208

    jm66208 Member

    Messages:
    99
    Location:
    KC
    Got it! Is the 6' rule for 3" pipe, 4", or both?
  11. Terry

    Terry Administrator Staff Member

    Messages:
    15,130
    Location:
    Bothell, Washington
    For the UPC code, it's 3" and 4"

    With the new low flow toilets, venting is more important than ever.
    Since there is less water in the bowl now, and so many new toilets using a quicker flush, how they are plumbed is much more critical.
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