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  1. #1
    mathew stouffer's Avatar
    mathew stouffer Guest

    Default Dishwasher drain line connection

    Looks like the plumber got a little creative. With multiple dishwashers how should the drain lines be connected. Pay no attention to the radiant heat manifold, exposed romex, and loose plumbing lines under the sink

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  2. #2
    Join Date
    Mar 2007
    Location
    Hudson, WI
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    Default Re: Dishwasher drain line connection

    Very cute

    Should have used a tail piece with a disposal tee.

    Last edited by Michael Larson; 09-04-2009 at 10:01 AM. Reason: missread post

  3. #3
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    Mar 2007
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    Orlando, FL
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    Default Re: Dishwasher drain line connection

    Quote Originally Posted by Michael Larson View Post
    Should have used a tail piece with a disposal tee.
    He did... his is horizontal.


  4. #4
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    26,252

    Default Re: Dishwasher drain line connection

    Quote Originally Posted by mathew stouffer View Post
    With multiple dishwashers how should the drain lines be connected.
    Into tailpieces with the tap for dishwashers, but the tailpiece should be ... vertical.

    Should have installed a tailpiece with a tap under the left sink and connected one dishwasher to that, then the other dishwasher as he did, only with the disposal connected to the 90 degree elbow down to its own trap and back to a wye cleanout where both traps would be connected into the drain to the vent.

    Of course, the above will now lead into the often discussed "single traps on a trap arm" discussion we have had so many times here.

    (underlining and bold are mine)
    - P3201.6 Number of fixtures per trap. Each plumbing fixture shall be separately trapped by a water seal trap. The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches (610 mm) and the horizontal distance shall not exceed 30 inches (762 mm) measured from the center line of the fixture outlet to the centerline of the inlet of the trap. The height of a clothes washer standpipe above a trap shall conform to Section P2706.2. Fixtures shall not be double trapped.
    - - Exceptions:
    - - - 1. Fixtures that have integral traps.
    - - - 2. A single trap shall be permitted to serve two or three like fixtures limited to kitchen sinks, laundry tubs and lavatories. Such fixtures shall be adjacent to each other and located in the same room with a continuous waste arrangement. The trap shall be installed at the center fixture where three fixtures are installed. Common trapped fixture outlets shall be not more than 30 inches (762 mm) apart. (Jerry's note: "shall be PERMITTED" DOES NOT mean "is REQUIRED", thus that sink is ALSO "PERMITTED" to have two traps, one for each compartment.)
    - - - 3. Connection of a laundry tray waste line into a standpipe for the automatic clothes-washer drain is permitted in accordance with Section P2706.2.1.

    Also refer to Table P3201.7: (bold is mine)
    - TABLE P3201.7
    - - SIZE OF TRAPS AND TRAP ARMS FOR PLUMBING FIXTURES
    - - - Kitchen sink (one or two traps, with or without dishwasher and garbage grinder)



    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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