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Old 08-27-2012, 06:57 AM   #1
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Washing machine discharge venting

I currently have a "studor" vent on a 1 & 1/2 inch discharge line from my washing machine. When washing a large load, the discharge from the wash cycle comes back out of the drain pipe and floods the utility room.
When i removed the "studor" vent and have an open pipe, the water drains perfectly. I thought the vent was not allowing enough air flow so i bought a much bigger one but still have the same problem.
The drain pipe makes two 90 degree bends in the first 12 inches
and the vent is approx. 12 inches higher than the drain.

Does anyone have any thoughts on how to correct this.?

Obviously, the air flow is part of the problem and i am trying
to correct this without having to run the vent thru the roof.
Someone told me the vent pipe needed to be several feet above the drain, but i don't see how that helps.


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Old 08-27-2012, 07:18 AM   #2
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If it is coming back out of the drain piping, I would have a plumber snake it. Also, if it is not at least a 2" pipe, with a proper trap, yes you can also have problems with water not flowing properly


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Old 08-27-2012, 07:21 AM   #3
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Washing machine drains are supposed to be 2". On older machines you could get away with 1.5", but newer machines have high capacity pumps that need a 2" drain.

If possible: You might try eliminating the Studor, and trying the vent to the vent that goes thru the roof. It might be easier to replace the drain with 2".
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