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Water accumulating on top of the sink's drain pipe nut

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http://boards.diynetwork.com/eve/forums/a/tpc/f/6191013504/m/6483960108

Feb 06, 2014, 02:25 AM
quanghoc
Water accumulating on top of the sink's drain pipe nut
I just installed the drain pipe. I tighten the nuts by hand and use channel lock to turn it another half turn or so. I didn't want to tight too hard because I was afraid it may break (possible?!).

When I turn on water at the faucet, no leak during 15-20min of running.

After I turned off everything and walked away, about 30min later, I saw some water accumulating on top of the nuts (two red circles in photo). I tried to feel the surrounding of the pipe and no leak from the outside of the top drain (black pipe). So this water must be from inside out, I assumed. But it doesn't make much sense because the position is quite high from the P-trap.

My question is: Why does it start leaking after like 0.5 - 1hr or so? What can I do about it?


Feb 06, 2014, 08:40 AM
Jaybee
First, the quick question: There is a milky/clear plastic compression ring the fits on each pipe. It's slid onto the pipe after you slide on the nut. Did you use them?

The leak may take a few minutes to appear as it may just take a bit for water to weep past where it's supposed to be sealed. The compression ring is what actually seals the joint and keeps if from leaking while the large plastic nut just holds everything together and tight. Without the compression ring, it is going to leak, but the leak will be small as the nut does close off most of any gaps.

So each time you use the drain some water collects around the threads of the nut. Then, over the next several minutes that water collects around the pipe joint.

This message has been edited. Last edited by: Jaybee,


Jaybee
Feb 06, 2014, 11:57 AM
quanghoc
I bought the kit from Home Depot and it came with nut and the plastic ring. Is that the same thing as you mentioned? If so, yes I had them installed.


Feb 06, 2014, 04:36 PM
Frodo
try this, you going to need a roll ot toilet paper and a flash light

put stopper in the sink, fill with water.
crawl under sink, have your better half pull the stopper
using a small corner of the tp
touch it to all surfices of the nuts and pipe
if there is a leak. the paper will wick the water. even if its a small little darn it cant find it leak
watch the paper with your light, go slow. take your time
if its leaking you will find it


https://www.youtube.com/*****?v=vn7bkncf1_E
Feb 06, 2014, 04:44 PM
ron45
Are you sure the rings are facing the right direction.?
Feb 06, 2014, 04:44 PM
Frodo
the picture you are showing, not the P trap but the other pipe, that comes out of the wall..it does not use a plastic nut. that nut is for the connection to the wall
the nut slids onto the pipe, around the 90 degree bend, and that fits onto the j bend of the trap.the washer is built in.

http://www.bing.com/videos/sea...6520492C2D22ABD6B073


https://www.youtube.com/*****?v=vn7bkncf1_E
Feb 06, 2014, 05:57 PM
quanghoc
quote:
the picture you are showing, not the P trap but the other pipe, that comes out of the wall..it does not use a plastic nut. that nut is for the connection to the wall
the nut slids onto the pipe, around the 90 degree bend, and that fits onto the j bend of the trap.the washer is built in.


@Frodo, not sure if I follow you 100%. I am sure the two red circle areas in my photo leaks. I am unclear about what you saying above. Could you elaborate more? Thanks
Feb 06, 2014, 08:20 PM
Re-mdlr
First -- those two pipes connect together with only a hand tighten nut, no washer.'

Second -- I've had the same problem you do and it turned out to be leaking from above where you've marked the two red circles. Did you use the right washer on the tailpiece where it connects to the strainer basket? Is the strainer basket tightened properly, etc etc. It's hard to see with a slow leak and the water can work it's way down without you seeing it. Feel for moisture on the pipes, or use toilet paper to see if water is going down the pipes because of gravity. And as someone said earlier, the washers must be installed with the bevel edge facing the right direction.

Also, I loose connect everything and then the first nut I tighten is the one connecting the two pipes in your picture -- if it doesn't 'seat' properly then it will leak, but that is beyond your 'two red circles'.

Plumbing has rules, break the rules, pay the price -- meaning if I don't tighten that nut before the others it ends up leaking.

PS the washer that sits in the tailpiece is a different washer than those in your picture.

This message has been edited. Last edited by: Re-mdlr,
Feb 07, 2014, 05:54 AM
Frodo
dry all surfaces first, then with water running, touch a corner of the tissue against the pipe
and watch for water to soak into tissue. start at the top and work your way down
water drips down, so....if the bottom nut and top nut are wet..your leak is up top




https://www.youtube.com/*****?v=vn7bkncf1_E
Feb 10, 2014, 02:17 AM
quanghoc
I have identified the source of the leak. It is inside of the threaded metal of the drain piece (photo #1).

I also noticed when I have the drain outside, the black pipe is actually spinning freely. Is it supposed to be like that? It's possible that it leaks where the PVC pipe touch the metal inside. I am not certain but just suspecting.

The black rubber seal ring under the sink is tight and there is no leak around there.

So I am just thinking it's either:
1. The whole drain is defected.
OR
2. Somehow the plumber putty didn't seal inside? But this doesn't make sense because it would leak around the black rubber seal, does it?


Feb 10, 2014, 08:01 AM
joecaption
I can see why.
Your missing the nut and sealing ring to attach the tube.


joecaption
Feb 10, 2014, 09:35 PM
quanghoc
quote:
Your missing the nut and sealing ring to attach the tube.


My first picture showed that (seal ring/nut) in photo #1. Or are you talking about something else?

I installed everything coming in the box with this drain.
Feb 11, 2014, 03:31 PM
Frodo
the black pipe [tail peice] screws into the metal basket strainer
turn it to the left AND UNSCREW IT..APPLY PIPE DOPE..NOT TEFLON TAPE
then screw it back tite....apply plumbers puddy to the basket strainer under the lip that is above the sink, replace rubber washer and tighten the nut.till the puddy squishes out the strainer..


https://www.youtube.com/*****?v=vn7bkncf1_E
Feb 11, 2014, 07:07 PM
quanghoc
I have been trying to remove the black pipe but it doesn't come out. I think it's not "screwed" in the metal basket but it has the lip on top and inside the metal threaded area. Isn't that strange?
Feb 12, 2014, 06:28 AM
Frodo
sounds like a pos drain from walmart or ace...toss it and get another


https://www.youtube.com/*****?v=vn7bkncf1_E
Feb 12, 2014, 11:54 PM
quanghoc
This has been my 3rd drain replacement from Amazon, on the same model:

http://www.amazon.com/gp/produ...00_i00?ie=UTF8&psc=1

I found a pattern:
- If I run the water normally, it is OK and no leak.
- If I fill the water up high, maybe as high as the overflow point and then open up, the water pushed down and there would be ~5 drops.

See below photo on where the water dropped and top of my sink.

I have used all components correctly, of course, with plumber putty. The fact is that it leaks inside the space between the black tube and the metal thread, it is confirmed the internal design of this drain has problem with high pressure (when fill up water high enough).

Am I correct? And if so, is it OK to just seal silicone in that space (blue circle)?

(My wife really likes this faucet/drain set so if we can just do that and no long term issue, it may be OK!? Dunno...)