Cast iron vent wyes

Discussion in 'IPC Plumbing Code Questions' started by BRK, Apr 11, 2016.

  1. BRK

    BRK New Member

    Joined:
    Apr 11, 2016
    Location:
    South Carolina
    Hey guys, i have a question about a vent that i saw today. the sanitary wyes used were installed backwards (running upstream) which seems like it would restrict air flow. Is this plausable?
     
  2. hj

    hj Master Plumber

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    Aug 31, 2004
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    Plumber
    Location:
    Cave Creek, Arizona
    Air is a gas the moves because of pressure differences, NOT GRAVITY, which means it works a lot different than water. For esthetic purposes ONLY the fittings are installed differently than if they were in a water drain situation, meaning, if your terms "backwards" and "upstream" are used properly, the fittings are correct.
     
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  4. Sylvan

    Sylvan Still learning

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    Sep 23, 2004
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    plumbing - fire suppression - boiler inspector
    Location:
    New York
    Reason also to install it "backwards" is to make sure when someone is snaking the line the snake (cable) will not go up the vent pipe .
     
  5. hj

    hj Master Plumber

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    Cave Creek, Arizona
    Actually, if installed properly, the snake will ALWAYS go up the vent pipe, once it gets started that way.
     
  6. Highlander

    Highlander Member

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    Dec 21, 2016
    Location:
    Ontario
    Aren't they also set up that way so any water getting in through the vent during heavy rain makes it to the sewer or septic?
     
  7. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    The FAI I install the Wye and 1/8 bend backwards

    The only water that may enter the vent is though the roof terminal
     
  8. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Since you are not concerned about the fluid's velocity, IF the PIPES are installed with pitch the water has nowhere to go EXCEPT to the sewer.
     

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