Looking for advice on venting

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hj

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vent

The vent in the newest drawing is not protecting the sink drain from aspiration when the washing machine discharge is flowing past its connection. Your earlier version with two vents was one way of doing it properly. The other way would have been to connect the washer trap to the 3", (the statement about not connecting anything below a toilet applied to conditions when the stack is used as the vent), and then running the vent to another vent, (not the sink drain). AAV's can only protect against negative pressures, but anything below a toilet or washer drain can be subjected to positive pressures if they do not have an atmospheric vent. The reason why vents and flood levels are interelated is that if the vent is too low and the drain plugs up, the vent will become a secondary drain once water in the sink rises to that level.
 

jamz

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Even though you all solved my issues in a seperate thread, I think ill hang out some more and increase my knowledge.....

With that said, the last set of pictures (well done) it shows the sink discharging into a Santee on its side. I thought Santee's arent allowed on their sides.

JAmZ
 

Mckeand13

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jamz said:
Even though you all solved my issues in a seperate thread, I think ill hang out some more and increase my knowledge.....

With that said, the last set of pictures (well done) it shows the sink discharging into a Santee on its side. I thought Santee's arent allowed on their sides.

JAmZ

The sink discharges through a trap and then into a wye. Not a santee.
 

Mckeand13

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So if I add a vent for the wash tub, all is well?

Vent size question: Is there any reason I couldn't step the vent size down to 1.5"? Any rules on keeping it the same size as the largest drain or anything like that?
 

jamz

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mckeand13 said:
The sink discharges through a trap and then into a wye. Not a santee.

/me slaps forehead

I stared for 10 min at this pic and all i can say is "DUH, im an idiot"
 
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