DWV Toilet to Sanitary t

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by moshetojinx, Mar 8, 2011.

  1. moshetojinx

    moshetojinx New Member

    Messages:
    5
    Location:
    MD
    Hello All,

    I am about to piece together my first DWV waste and vent lines. The bathroom was remodeled and enlarged to accommodate a 6' tub in a new location. Since I want to keep all in check with codes for MD, I have a few questions please.
    First off does any one see something terribly wrong with my current set up?
    The problem I think I may encounter is the double 3" sanitary t. the water closet drains into a vent elbow which in turn is connected to the double t, from there it all goes 3 south out to the sewer. I plan on using a 1.3 - 1.6 flow toilet. I could use a 3" single t and reroute the kitchen sink to go from a 1.5 and dump into a vertical 3" which will go into a 3" wye if needed.
    The picture is for demonstration. This is close to the actual waste configuration, but the pipe lengths have been shortened on the water closet.
    [​IMG][/IMG]
  2. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Yikes... You certainly don't want to use a santee on it's back like the note says...

    The rest of it needs improving too, I'll let a real plumber chime in.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,642
    Location:
    Cave Creek, Arizona
    The sanitary cross, can be a double combination Y-1/8 bend in your situation, but not necessarily in others. You CANNOT change the combination fitting to a sanitary tee, unless you revise the piping. If you are going to reduce the sink drain, do it AT the "tee", not the elbow. What is the "main stack"?
  4. moshetojinx

    moshetojinx New Member

    Messages:
    5
    Location:
    MD
    Hello hj,

    I will most likely revise the sink to eventually go into a wye just south of the waste (below where double t is).
    I am not sure what you mean by "You CANNOT change the combination fitting to a sanitary tee". Please elaborate by using the colors in the photo.

    Thanks,
    Rob
  5. moshetojinx

    moshetojinx New Member

    Messages:
    5
    Location:
    MD
    By main stack I mean this what the sink is tied into and above that all of the vent pipes (toilet and shower). My bathroom sink does not have a vent since it is 24" from the 3" vertical vent.

    Thanks,
    Rob
  6. moshetojinx

    moshetojinx New Member

    Messages:
    5
    Location:
    MD
    Wye or why not?

    I am trying very hard to do this correctly.
    So from my understanding, I can not use sanitary t's on their backs (horizontal position). Would it be OK to replace it with a wye in a horizontal position with a 45 degree fitting or is this essentially the same thing?

    Thanks,
    Rob
  7. Designie

    Designie New Member

    Messages:
    39
    Location:
    Detroit, MI
    A wye fitting with a 45 elbow is the optimum way to do that fitting. It is NOT the same as the sanitary tee.
  8. moshetojinx

    moshetojinx New Member

    Messages:
    5
    Location:
    MD
    Thanks for your reply.
    I will switch over to wye fittings on the horizontal.

    Rob
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,642
    Location:
    Cave Creek, Arizona
    Why would you do that. The combo fittings you show are usually easier to work with than "Y"s at those locations. IF the sink is going into the vertical "main vent", and doing so properly, then the sink DOES have a vent. YOU are the one who made the notation, "Note on shower. I will replace the long sweep with a sanitary tee". You CANNOT do that. You have also made the same mistake many people do when they decide that anyone can be a plumber. They think that "bigger is better" when it comes to drain line pipe sizes. You also do not show how you are going to vent the shower using your drain line configuration.
  10. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    The combos you have in the picture, are a one-piece version of a wye + 45. Cannot replace either of those with a san tee. And where are any vents? I see a toilet vented, that's it?
Similar Threads: Toilet Sanitary
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & relocating toilet - wye or sanitary tee at horizontal junction Jul 10, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Sanitary tee on back for venting toilet Jul 22, 2012
Plumbing Forum, Professional & DIY Advice, Tips & Toilet and Vertical Sanitary Tee Oct 22, 2007
Plumbing Forum, Professional & DIY Advice, Tips & Toilet Troubles... and maybe a sink too. Any advice appreciated. Today at 5:31 PM
Plumbing Forum, Professional & DIY Advice, Tips & Rebuild a toilet stop valve? Sep 6, 2014

Share This Page