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Flat Venting

Discussion in 'Plumbing Codes' started by north star, Jun 1, 2018.

  1. north star

    north star Sawhorse

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    ~ & ~

    I have a set of plans with a 4" horizontal drain to 4" horizontal drain
    connection with a 45 degree wye fitting and then a 1/8th fitting farther
    upstream.......Both of the 4" drain lines are for solids & liquids.......The
    heel inlet of the 4" wye fitting connects to an existing 4" dry vent....The
    term I am thinking of is "flat venting".

    In looking at the proposed design of this connection wye fitting, I am
    thinking that the solids entering the existing 4" drain line "could"
    potentially block the dry vent......I have always been taught that these
    types of "horizontal drain-to-horizontal drain fitting" connections
    should have the wye fitting turned upward ( full vertical position ), so
    that the drain line solids enter the downstream horizontal drain line
    from the top rather than the side.

    QUESTION # 1: Does any of this rambling make sense to ya'll ?

    QUESTION # 2: Is there language in the `06, 09 or `12 IPC's, that
    require the solids to enter from the top of the horizontal drain line
    rather than from the side ?
    QUESTION # 3: Haven't we had similar discussions on this Forum

    before regarding "flat venting' ?

    Thanks !


    ~ & ~
     
  2. steveray

    steveray Sawhorse

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    Vent connection has to be above the centerline of the pipe....For a dry vent. I guess we just ignore when it is a wet vent as in theory the wet waste will clear the vent, or the waste will plug and you will clear the vent....

    905.3 Vent connection to drainage system. Every dry vent
    connecting to a horizontal drain shall connect above the centerline
    of the horizontal drain pipe.
     
    #2 steveray, Jun 1, 2018
    Last edited: Jun 1, 2018
    north star likes this.
  3. north star

    north star Sawhorse

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    % ~ % ~ %

    Much Thanks **steveray** ! :)

    % ~ % ~ %
     

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