08:33AM | 06/04/05
Member Since: 06/03/05
1 lifetime posts
I recently added a vegi sink to an island i built in the kitchen. When I ran the waste line I tapped into an existing waste line in the bathroom. Now when we run water in the bathroom sink I get sewer gas coming from through the p trap in the kitchen. The kitchen drain has a in line vent and the bathroom drain is vented through the roof. The waste line from the kitchen sink is angled very steeply from the sink to where it joins the bathroom line. Could this be the reason I am having problems or is the problem that my drain lines are clogging. Help my kitchen stinks


05:29AM | 06/09/05
Member Since: 08/29/04
227 lifetime posts
The thing about plumbing is the downhill. A couple of important things are to maintain only 1/4" per foot of fall when you run a drain line, or you will have problems with venting. Every fixture has to be both trapped and vented. A trap is a U shaped pipe attached to the fixture to hold a certain amount of water inside to act like a stopper for the gas. The vent has to be within a prescribed distance from the trap to keep it from siphoning water out of the trap each time it is used. There can be no downturns from the end of the trap till it attaches to the vent, it must run at 1/4" per foot. The sink must dump within 24" of the trap vertically. The vent can't be any closer than 3 pipe sizes from the hub of the trap. The vent must extend up to within 6" of the bottom of the sink (remember water seeks its own level) any water in the sink will flow up and close off the vent, preventing its function if its too close to the pipe. The rules a plumber has to learn are endless.

Raymond VinZant Plumbing Prof.
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