Utility Sink drain?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Redline, Jan 18, 2011.

  1. Redline

    Redline New Member

    Messages:
    8
    Wanting to install a utility sink next to my washing machine where the table currently is....


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    There is currently a 3" CI uncovered washing machine standpipe next to the washing machine that the drain hose just sits into. Can I splice in a Wye or T to drain the sink? Will I need to vent this through the roof or will open venting still be ok? The main stack is about 2' away in the center of the laundry room (very right side of pic) that has been converted to PVC although there is already a 4-way T at the ceiling to accommodate first floor bathrooms, so tying into that might be a challenge.

    What is the correct way to do this given what I am working with?
    Last edited by a moderator: Jan 18, 2011
  2. Rich B

    Rich B DIY Senior Member

    Messages:
    283
    Location:
    New Jersey
    Looks like no one wants to tell you they think your going to need a lot of work to correct what you have before you can add anything.....Maybe more pictures would help but I doubt it......

    Should be a standpipe with a p-trap and a vent. All I see is a pipe into the floor........where is it going and how is it trapped and vented now? Doesn't look even remotely correct and I can tell that and I'm not a plumber....
  3. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    The fixture traps must be above the floor. Assuming there is a trap under the floor, it will need to be removed before the system can be set up in the manner you desire.

    [​IMG]
  4. shacko

    shacko Master Plumber-Gas Fitter

    Messages:
    561
    Location:
    Rosedale, Md
    My take on what you have is a unvented pipe comming thru the floor (which I would bet) has no trap on it.

    YOU HAVE AN EXTREME HEALTH HAZARD ON YOUR HANDS!
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,519
    Location:
    Cave Creek, Arizona
    We don't know if there is a trap under the floor for the washing machine. The proper way would be to install a tee in a vertical drain line, then vent it properly with a trap at the sink. The washer's drain does not appear to have a vent on it either.
  6. Redline

    Redline New Member

    Messages:
    8
    the trap is in the floor, its a standard (at least around here) washing machine standpipe. Local code says you dont need the washing machine to be vented via AAV or roof, so i was curious if you could splice in a sanitary T for the utility sink drain as well..

    The main stack, although PVC is in the middle of the room and not possible/desirable to tie vent into.

    From what it sounds like, code-wise, im sort of screwed unless i run a vent up the wall and tie into the main stack on the first or second floor?
    Last edited by a moderator: Jan 18, 2011
  7. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    I think you might be misreading or there has perhaps been a change in the past couple of years that I am not familiar with. To my knowledge, the standpipe cannot be greater that 30" or less than 18" above the trap, which should be above the floor. Yours does not meet this requirement. If it did, then you can also drain your laundry tray into it, (unvented), but only if your laundry is on the ground floor. (which it does not appear to be).

    Yes, St. Louis allows things that are not acceptable in most of the U.S.
  8. Redline

    Redline New Member

    Messages:
    8
    Thanks guys for your help. I ended up talking to the local county building code inspector since it seems that St Louis is a little backwards in plumbing code and what flys here would be ridiculous elsewhere.

    I know a drain vented to the roof would be best, and the ptrap for the washing machine *should* be above ground...

    but...

    its St Louis...so in this case, the open-vented washing machine standpipe with ptrap in the ground is par for the course. On top of that, cutting in a sanitary T for a utility sink drain (no ptrap) and leaving it open-vented is also code, so long as the utility sink is no more than 30" away from the standpipe.

    Thanks again for your help...now i know how backwards StL plumbing code is.
  9. shacko

    shacko Master Plumber-Gas Fitter

    Messages:
    561
    Location:
    Rosedale, Md
    If thats all true all I can say is WOW!
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