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gunit 01-09-2013 02:52 PM

Plumbing drain advice need
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Hello all,
I think i have a relatively easy question for you experts, I have not done any sort of plumbing like this before, so i wanted to get some advice from you guys who know what you are doing.

My kitchen sink has gotten plugged a number of times, and to the point where under the sink gets completed flooded with water (i don't what the fitting is called, but it is a smaller 1/2" drain that points upwards above the trap)

What I think is the problem is that the previous owner plumbed this incorrectly. Where the water leaves the garburator, it is tied in before the trap, and I have had to take it apart a couple of times to drain it. It is so bad that I cannot even use the garburator. Of course, that is my speculation, that is why i am here, i hope someone of you can give me some advice on how to redo this. I have purchased some ABS glue and some parts already, but I want to make absolutely sure before i start cutting things and adding fittings in.

I have attached a picture for you to look at, in the pictures i have numbered a couple of things so you can understand what i am talking about.

As you can see, #1 is one drain and #2 is the drain for the garburator. when the water leaves the garburator, it drains to junction #3, which is before the trap. This so happens to be the same drain that #1 uses, which likely explains why when i do alot of washing and the water piles up, it over flows through the one spout that is just between #3 and #1 (pointed up).

I have no clue what #5 is, nothing is connected to that. #4 i assume is the main pipe that takes the water outside the house to where-ever it goes.

How do i reconfigure this correctly so i can get everything working properly??? Any advice would be appreciated. I hope the attachment of the JPG works....

CallMeVilla 01-09-2013 06:14 PM

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WOW! That is a mess -- even though I suspect it works. The plumbing principle is to minimize the turns and angles so the water can flow evenly. Your garbage disposal makes a lot of turns which slows down the outflow. Not good. Frankly, I NEVER use the disposal -- too much maintenance. You could re-plumb this whole mess by losing the disposal and running straigher pipes . . . but, since you have it . . . <sigh>

I see the bowl under the p-trap. I guess the leakage is coming from there. Notice the angle in the p-trap as it hits what might be the drain . . . UGH.

Your #5 might be a vent stack which allows air to enter the lines, preventing a blockage.

Here is a picture of how it should look. If you can re-design it as cleanly as this, you will solve many problems.

nealtw 01-09-2013 06:42 PM

The little spout that you say overflows is for the dishwasher drain and should not be open. In Villa's photo you can see the dishwasher line goes directly into the garberator. Where do pipes 4 and 5 go to up when they go out of site.

gunit 01-10-2013 10:40 AM

Thanks. I assume pipe #4 is the sewage line. I have no clue what pipe #5 is. i assume it's another sewage line, but nothing is visibly connected to this.

The little spout that points up, which is the spout just to the right and up of #4 is where the water overflows from and drips down - how do i close this? Is this the dishwasher drain that you are referring to??

So the fix is to repipe this to eliminate as many of the angle pieces as possible??

gunit 01-10-2013 11:30 AM

One other question, if i can reconfigure this, I would eliminate the angle coming out of the garburator, so it would be straight, and I would pipe that to the drain from #1 (going down), do i need the one joint that is above Joint #3? that is the joint with the spout pointing up....

Then from the P-trap, I would then try to eliminate the one angle piece that runs into the sewage line by making that one piece straight as well.

Does this sound reasonable? All of the pipe is glued tight, so doing this may take me abit of time to do and reglue. The most urgent spot appears to be the bend coming out of the garburator....

Wuzzat? 01-10-2013 11:48 AM


Originally Posted by gunit (Post 82004)
Does this sound reasonable?

Turns out the 2011 NEC is on the Web because once it becomes law it is no longer covered by copyright. I also have an online version of the 2008 NEC.

Therefore, a current edition of the International Residential Code is probably on the Web somewhere, and I recommend you look for it.

I had a simple vanity install and had very few options as to piping if I would follow their guidelines if I didn't want to tear up the wall and repipe.
These codes can be pretty restrictive.

However, as to testing, for testing a lavatory sink you can fill it to the overflow hole (about a gallon) and yank out the stopper at time = 0. Then, good systems drain in 5 to 15 seconds (sample size = 2) and a bad one (sample size = 1) in 70 seconds. Even if you see a little whirlpool the piping can still be partially restricted.
For more accuracy/repeatability fill with 1.0 gallon.

For larger sinks some benchmarks can also be extracted, probably using two or more gallons, with a Disposall running or not.
Stay tuned to this channel! :D

nealtw 01-10-2013 04:36 PM

You might be able to get a cap to glue on the end of that small pipe if not a short peice of hose with a bolt or something in the other end and clamped would be a temp fix. But it looks like you have a dishwasher line higher up on pipe 4. If it is up there it shouldn't be. Do pipes 4&5 go back into the wall?

gunit 01-11-2013 08:34 AM

The sink is in an island in my kitchen, both appear to go downstairs. I am not really sure what #5 is yet!

Where should the dishwasher line on Pipe 4 be hooked up to? should I be redoing that as well?

Wuzzat? 01-11-2013 10:34 AM

Venting for island sinks gets a little weird.

inspectorD 01-11-2013 01:16 PM

Does number 5 go around in a loop, or is there a vent looking thing at the top or the pipe that ends about at the countertop.

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