Limit to number of bends in vent pipe?

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Old 11-13-16, 09:06 AM
Q
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Limit to number of bends in vent pipe?

Is there a limit to the number of bends in a vent pipe to the outside?
From the sewage ejector, there are 4 90 degree bends.
I'm worried that that will stop it from venting properly.
 
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Old 11-13-16, 10:36 AM
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Are you using 2" pipe all the way up? Where you have 90 degree turns, are any lateral? If so, they must be tilted slightly so any water collected would run back down the pipes rather than collecting in the corner and clogging it all up.
 
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Old 11-13-16, 06:34 PM
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Even horizontal would never clog fully would it as water will still run down? There is a short section near the roof that runs horizontally for 24" to clear the soffits/overhang. Then another section maybe 6ft long before entering the pit which has a slight incline but not very steep.
It just seems like a pipe going straight up would work better and draw air out?
 
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Old 11-14-16, 11:34 AM
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There's no issue with more bends. The goal isn't to pull lots of air in, just to keep the pressure the same in the system without introducing any vacuums when you flush.

Depending on the location, you may want to consider a cleanout. Squirrels have been known to hide acorns in vent pipes. I don't foresee much of an issue... but at least something to consider.

-Mike
 
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Old 11-14-16, 02:21 PM
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90 degree bends are radical, as Mike says. Squirrels can clog one up where there isn't sufficient gravity to pull the crud down. I prefer 45's as opposed to 90's. I would also consider a cap of sorts. I don't know why it isn't a standard part to vent pipes. So simple, yet it is never used.
 
 

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