Another vent question

hammerlane

Thats why it says PROHIBITED under it the words Sanitary Tee

BC Plumber

The MAIN purpose of a vent is to break the siphoning action of water going down a pipe. If nothing is there to break the siphon, you can siphon the water out of your p-traps and allow sewer gas into your house. Of course it also helps draining of the fixture by allowing air in the system to prevent a vacuum like scenario. In my area every house is required to have 1 3" vent penetrating the roof- apparently this also helps vent the city's sewer system. When using a wye for venting, just think if rain got into the pipes which way you would want it to flow.

Where are you from? One again, according to my code, wet-vents have no length restriction.

hammerlane

The venting has more purpose than to just allow sewer gases to escape to the atmosphere

mikem201

Ok, so your saying you should NOT use a WYE fitting to vent? You can not use a san tee on its side so what else do you propose?

hammerlane

BC Plumber never said to use a Wye to vent? Where did you read that at? The way the wye is oriented is the proper way to use it as a vent for this setup.

Once again, imagine the air being drawn in from the vent opening above the roof(shown with the green arrows) as the toilet water is rushing down the 3" pipe past fitting "A".

With the orientation of fitting "A" in the photo, the air is aided in its "flow" behind the water. The "smoothest" way for air to go down that line is with the orientation of fitting "A" the way it is pictured.

Along with aiding in air flow, Like BC Plumber said imagine when rain water gets into the vent system, with the way fitting "A" is oriented, the rain water will naturally drain.

A vent tee could also be used if you were able to go straight up into a wall.

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md2lgyk

It's worse than that. There is at least one other plumbing code (the IPC) that is radically different from the UPC. That's the problem I have with codes. I am an engineer, and 2+2 equals 4 no matter where I am. But with codes, here it can equal 4, the next county over 5, and yet another county 6 but the inspector will maybe say it equals 4 and let it slide. If it was really so important, the codes would truly be uniform.

A good example is toilet venting. Under the UPC, a toilet requires a separate vent if it's more than (I think) 5 feet from the main stack. The IPC doesn't require a separate vent at all, no matter what the distance.

TheEplumber

Code designers are like our government- they're driven by lobbyists.
example- I have to plumb a soft cw line as well as a dedicated hard cw line to hose bibs and kitchen sink on new homes. Doesn't matter if a softener is installed or not. Why? Because around here water softener/treatment installers are not licensed plumbers. So they technically can't cut in tees or valves or otherwise touch water lines. We have to set it up for them at the beginning.
I have no definitive proof but I feel the equipment manufacturers influenced the plumbing board to adopt this amendment to protect their industry.
The additional piping costs are passed on to the homeowner regardless of installing a softener or not.

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TheEplumber

No it doesn't for image "c" That image is very misleading or I'm missing something- which is totally possible
Also, the combo in "B" is legit- unless it's a trap arm- it doesn't say

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Alan

OMG

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Alan

Before you get booted off the forum (which i'm sure after that outburst is inevitable), i'd just like to point out that you STILL haven't (for some unknown reason) given a location, to allow us to better interpret what you need to do with whatever it is you're trying to do.

Your initial question was somewhat vague, and your snippy response to the first request for more information was uncalled for.

I'd like to take this time to wish you best of luck in all your future endeavors, both plumbing, and non. May your toilets flush effortlessly for all eternity.

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TheEplumber

Allen, your response is a lot more civil then the one I deleted before posting. Cheers

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profcolli

Aside from the OP presumably leaving in a huff, can you clarify "unless it's a trap arm" please?
Is the top half "B" ok if it leads to a sink p-trap (thus a traparm).... and the bottom half is also ok unless it leads to a p-trap

TheEplumber

The top part is a correct way to pipe a trap arm- using a sanitary tee
The bottom part is not correct- a combo does not allow air to the trap arm to break the siphon action.
A combo can be- some would argue should be used if the bottom part of the image was simply a branch line that led to another vented trap.
No traps are shown at all so it's a tad misleading - I interpreted the drawing to say that a combo cannot be used in that orientation at all.
Clear as mud now?

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Alan

Don't beat yourself up too bad. I'm sure mine would have been a little less had it been directed at me.

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