Bill

I had went to NJ and saw my dad on a plumbing job and he asked me how to do an island sink drain. I told him we run a whatever the main line x 2" tee wey, then come up through the floor, through the cabinet base, install a sanitary tee with a AAV on top of the tee. I helped him do it and when the inspector came he failed it. Not because we used a mobile home vent, we used a top of the line brand (Cant think of it right now) but rather the inspector wanted a what ever x 2" tee wey on the main line, then come up into the cabinet, then turn a 90, over to a 2x2x1-1/2 sanitary tee on its side so the trap can connect to the 1-1/2 side, then the other side the tee goes over to another 90 turned down, then run back through the cabinet to the main, connected by another what ever x 2 tee wey. I cant for the life of me figure that one out because what you are trying to accomplish is actually a vacume break. If the main line loads up as it passes the sink it causes negitive pressure in the line to the sink (Vacume) thus sucking the water out the trap. So, where happens when the main line loads up with this inspectors idea? There is no place for air to get in to break the vacume at all exept through the trap. Am I missing something here?

Dont laugh at my drawing, I am not an arist but this is how the inspector wanted it. The red dot is the tee for to catch the sink trap

Attached Images

plumbing.jpg (18.2 KB, 36 views)

__________________
Virginia Plumbing Codes
Virginia Department of Licensing

Plumberman

He had the right idea with how he wanted it, but he missed one thing.When we install an island sink we come through the cabinet twice. Downstream we cut in a vent and arm it over to the nearest wall. Lay combos down, and on the second drain line we cut in a 2" combo to hit the wall. Now its vented....Studor vents are not legal down here unfortunatly..

WestCoastPlumber

AAV's are not legal here, unless you can talk the inspector into it. Except you need a c/o on the vent in the wall, and where the santee is, you should use a comby, but sometimes you don't have the room, so the inspector will approve the santee.

Maybe this will help, this is legal, in UPC country.

__________________
Robert

Plumber Culver City, Plumber Los Angeles, Plumber Manhattan Beach, Plumber Hermosa Beach,Plumber Marina Del Rey, Plumber Redondo Beach, Tankless water heaters Los Angeles
Tankless repair Los Angeles

Plumberman

I looked for a pic but gave up.... Exactly what I was trying to put into words

22rifle

You mean a combo where the vent tees off? Why so?

BTW, this is the way I am used to doing it pre-AAV.

Bill

OK, now here is the problem people! code clearly states "No vent line shall run horizontal unless it is 6" or more above the flood rim level" So according to that pix it is a code violation. So they are violating it themselves by wanting it done that way.

__________________
Virginia Plumbing Codes
Virginia Department of Licensing

WestCoastPlumber

Not sure, supposed to be a comby where the vent goes to the wall.. This is how it is in the UPC illustrated manuel. shows a wye 1/8th bend.

__________________
Robert

Plumber Culver City, Plumber Los Angeles, Plumber Manhattan Beach, Plumber Hermosa Beach,Plumber Marina Del Rey, Plumber Redondo Beach, Tankless water heaters Los Angeles
Tankless repair Los Angeles

Killertoiletspider

My code does not say that, it says all vents must tie in 6" above the flood rim of the tallest fixture being served by said vent.

Plumberman

Thats why you tie the lines in at the highest point possible.... I see what your saying though.

Ron

Right, to can run a vent below the flood level rim, but rules do apply, vertical to horizontal can be a short turn, but when going from horizontal to vertical it has to be a drainage fitting, then when connecting to the exiting vents, you have to be six inches above the the fixture it surves as KTS just said.

UPC Code.

That island loop picture posted by WCP is correct, except you have to have a clean out on the vent in the wall and it has to be accessible.

__________________
If you are a DIY'er posting on here, listen up, I will find your post and you will be banned. So heed the warning.