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Old 01-22-2012, 03:16 PM   #1
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ABS drain pipe leaks under pressure test


Hello!

I just did a pressure test on my new ABS pipe drain system, with a column of water 20' high, and I got two small leaks (drips) in two joints in the crawlspace.

Last week, when I has halfway done (column of water 8' high) I tested it also, and with that smaller pressure nothing was leaking at all, so I'm not worried that I'm going to have a problem under real life conditions.

The thing is that next week I have to pass inspection, and even if my inspector is not likely to go down into the crawlspace, I'd still like to stop those leaks.

The leaks are coming from two joints in a wye fitting, and cutting it out and replacing it would involve redoing the hardest, tightest spot in my system (other fittings are right next to the leaking one, with no room for a coupler).

Does anyone know how to stop those leaks without cutting out any of the pipe?

Thanks!

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Old 01-22-2012, 03:19 PM   #2
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ABS drain pipe leaks under pressure test


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I'd still like to (need to) stop those leaks.
...replacing it would involve redoing the hardest, tightest spot in my system
c'est la vie

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Old 01-22-2012, 03:20 PM   #3
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ABS drain pipe leaks under pressure test


Two choises as I see it, take a chance on leaking sewage into the basment or fix it.
Easer to do it now before it's covered up.
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Old 01-22-2012, 07:40 PM   #4
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ABS drain pipe leaks under pressure test


Fix it.

You're doing it yourself, do it right. Fix it. We'd have to.
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Old 01-22-2012, 11:06 PM   #5
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The leaks are coming from two joints in a wye fitting, and cutting it out and replacing it would involve redoing the hardest, tightest spot in my system (other fittings are right next to the leaking one, with no room for a coupler).
Post a pic, maybe we can help you figure out an easier way to redo. Ultimately though, it'll have to be fixed.

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Does anyone know how to stop those leaks without cutting out any of the pipe?
Sorry but sounds like there's no other way than cut out & replace.
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Old 01-24-2012, 12:52 PM   #6
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ABS drain pipe leaks under pressure test


Thanks again, folks, I appreciate your good intentions.

Cutting out that 4" fitting and the other six that would have had to be cut along with it was my last option.

I dried the joints with a hair dryer, and brushed a thick layer of ABS cement on them. Put a light next to them to cure the cement faster, and did the pressure test again, but this time only to 12' high (high enough for the pipes to sound full when the inspector tapped them and high enough also to test them adequately). One of the joints didn't leak at all, and the other one (in the vent) leaked at a rate of about 10 drops per hour.

Those joints will never again experience that much pressure. If the sewer ever backs up, at 3' of height my tub will start filling up with sh*t, and at 5' my tub and toilet will start overflowing with sh*t. At that point, if that joint leaks a drop of sh*t, it will be the last of my worries.

I just passed the inspection. The city is happy, I am happy, and my drain system is going to perform the way it's supposed to. What would have happened if I had filled the pipes again with a 20' column of water above it? We will never know.

Last edited by abracaboom; 01-24-2012 at 01:09 PM.
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Old 01-24-2012, 01:04 PM   #7
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ABS drain pipe leaks under pressure test


If you know exactly where the leak is, cementing a small piece of (ABS) plastic over or against the leak will seal it up.

Now that does look sloppy and does not pass code.
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Old 01-24-2012, 01:40 PM   #8
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ABS drain pipe leaks under pressure test


I'm curious as to why you are pressure testing drain lines. Is this required per your inspection? When are drain lines under pressure? Also, most pvc even say on it, not to be used under pressure, or something to that extent.
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Old 01-24-2012, 05:06 PM   #9
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I'm curious as to why you are pressure testing drain lines. Is this required per your inspection? When are drain lines under pressure? Also, most pvc even say on it, not to be used under pressure, or something to that extent.
It is required here, yes, although today my inspector didn't check if the pipes were full of water or not. Those pipes are never going to be under pressure; my guess is that they require it as a sure way to make sure that the plumbers haven't missed any joints. You know plumbers!
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Old 01-24-2012, 06:46 PM   #10
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ABS drain pipe leaks under pressure test


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It is required here, yes, although today my inspector didn't check if the pipes were full of water or not. Those pipes are never going to be under pressure; my guess is that they require it as a sure way to make sure that the plumbers haven't missed any joints. You know plumbers!
Pretty much spot on. Although part of the code is a 10ft head of water (5lbs. of pressure) my town didn't enforce it 15 yrs ago. but there was one too many complaints of dry fit joints from new homeowners. Since then, eveything gets tested
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Old 01-24-2012, 07:04 PM   #11
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but there was one too many complaints of dry fit joints from new homeowners. Since then, eveything gets tested
ABS... no purple primer.
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Old 01-24-2012, 07:08 PM   #12
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ABS... no purple primer.
I use the new and improved milky white, dries clear
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Old 01-24-2012, 07:27 PM   #13
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Thanks for enlightening me

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