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-   -   Installing a Standpipe without a vent? (https://www.askmehelpdesk.com/showthread.php?t=332113)

  • Mar 21, 2009, 12:49 PM
    momof4123
    Installing a Standpipe without a vent?
    Can I install a standpipe for a washing machine with an s-trap and not vent it?






















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  • Mar 21, 2009, 12:55 PM
    mygirlsdad77

    Not legally.


    I think I would at least put in an aav.

    Instead of using an s trap, use a p trap.

    Here's how it goes. Bring drain up one foot, then put in a tee, on the side of the tee install a p trap, and stand pipe(24-30 inches high). On the top of the tee put a aav(air admittance valve).

    Please let me know if this helps. If not, I'm sure one of the pros here will set you up with a drawing.
  • Mar 21, 2009, 01:08 PM
    speedball1
    Gottcha covered Dad!
    I'm afraid that with the force of the washer pump the velocity of the discharge will suction the trap seal right out of the stand pipe if you install a "S" trap. It will look something like this,(see image) except the ell will be swapped for a sanitary tee and the AAV will mount on top of the tee as Dad directed in his earlier post. Good luck, Tom
  • Mar 21, 2009, 05:11 PM
    csavage1

    The auto vent should be installed above the flood rim of the standpipe.
  • Mar 22, 2009, 07:39 AM
    speedball1
    Quote:

    Originally Posted by csavage1 View Post
    The auto vent should be installed above the flood rim of the standpipe.

    In a ideal installation you would be cvorrect. But since a AAV only will allow air to enter and blocks anything going out all of our AAV's are installed below the floor rims of the sinks and lavatories that we are venting.. See the image in my earlier post. Regards, Tom

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