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-   -   Is this an allowed vent arrangement? (http://www.diychatroom.com/f7/allowed-vent-arrangement-82322/)

paulyg 09-25-2010 02:26 PM

Is this an allowed vent arrangement?
 
2 Attachment(s)
I am adding an auxiliary vent to the kitchen sink drain line as part of a kitchen renovation. Currently the drain branch line does not have any vent on it's own. It's an 80 foot run to the main waste stack where there is a vent. Consequently the line gurgles and is slow.

When planning things out I figured I could employ the typical arrangement of having a standpipe in the wall with a sanitary tee were the trap would connect. I am illustrating this in the first image (Original Vent.jpg). The image is looking at the sink from the side. Looking at the sink from the front the standpipe would be offset to the left because there is a window behind the sink.

I ran into problems I only have a 3" space between where the stud that frames the window ends and end of the sink cabinet. And under that slim space is a floor joist. So I want to know if I can make the vent arrangement as shown in the second image (Alternate Vent.jpg). I would bring the drain line through the floor and connect to the vent in the crawl space. The vent pipe would jog over about 2', clear of the window and joists and go up the wall.

Thanks.

NHMaster 09-25-2010 04:09 PM

Nope. that's an S trap which is illegal, and the vent does nothing at all. You are not understanding how a vent protects a trap seal

TheEplumber 09-25-2010 04:58 PM

1 Attachment(s)
The most common ways to vent a kitchen sink. (you are venting the fixture trap, not the drain)

paulyg 09-25-2010 06:43 PM

Sorry about my crude cad sketch NHMaster. I just wanted to illustrate a trap. I know it will be a P-trap, not an S-trap.

I'll look for another alternative for the routing.

DangerMouse 09-25-2010 08:02 PM

You may be able to use an AAV like I did to pass inspection. Po)

DM

the_man 09-25-2010 10:11 PM

Not sure about where you are, but in my area the trap arm on a 1.5" drain is 3 foot 6 inches and you can get 180 degrees of turn without a cleanout. Which basically means i can run the drain/vent line straight to the side of the window, set the san tee for the drain in the wall, and 90 out where i want the drain. maybe thats what eplumbers drawing was but i cant see it :)

ryanh 09-27-2010 10:09 PM

Is there any code requirement on where the t branch or height of the vent line to the sink is located?. I guess high enough that your your p trap from your sink has to connect to the drain/vent 5 below the 45 from the wall?

TheEplumber 09-27-2010 11:36 PM

Quote:

Originally Posted by ryanh (Post 508181)
Is there any code requirement on where the t branch or height of the vent line to the sink is located?. I guess high enough that your your p trap from your sink has to connect to the drain/vent 5 below the 45 from the wall?

Not sure I understand your question-
The height of the sanitary tee (not a wye) to the trap arm is determined by your sink configuration, disposal, etc. (16" plus or minus)
The vent cannot go horizontal until it is 6" above the flood rim of the highest fixture (unless prohibited by structual conditions) Rule of thumb is 42"
Hope this helps

ryanh 09-28-2010 07:17 PM

Quote:

Originally Posted by TheEplumber (Post 508208)
Not sure I understand your question-
The height of the sanitary tee (not a wye) to the trap arm is determined by your sink configuration, disposal, etc. (16" plus or minus)
The vent cannot go horizontal until it is 6" above the flood rim of the highest fixture (unless prohibited by structual conditions) Rule of thumb is 42"
Hope this helps

Makes sense, What about if there is a window above your kitchen sink then that 6" above the flood rim of the highest fixture wouldn't work. Do you just go vertical as high as you can from your p trap and then go horizontal under the window run and then around the window and up?

DangerMouse 09-28-2010 07:36 PM

Air admittance valve?
$23.00.... problem solved?

DM

TheEplumber 09-28-2010 07:40 PM

Refer to the image in post #3 of this thread


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