Cast iron vent wyes

[BRK]

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?

 

[hj]

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.

 

[Sponsor]

 

[Sylvan]

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 .

 

[hj]

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

 

[Highlander]

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?

 

[Sylvan]

The FAI I install the Wye and 1/8 bend backwards

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

 

[hj]

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.