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Old 12-11-2011, 04:52 PM   #1
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1" C-C union leak due to uneven joint


I have a 1" C-C union on the inlet pipe for my radiator boiler that I put there so that i can easily take the boiler on and off as well as to be able to mount a pipe/gauge contraption i engineered to test the pressure upon changes to the system, which i do frequently.

the problem is that the inlet pipe coming out of the boiler is slightly offset, maybe something like 85 instead of 90 deg. the feeding 1" copper pipe, which i had plumbed before setting the boiler in, is pretty darn geometrically proper, all level flush and 90 deg angles.

since this C-C union is in the first leg of the inlet pipe coming out of the boiler, it meets the geometrically proper street 90 deg elbow with the other side of the union and the joint does not sit properly, i.e. there is a small gap (maybe like 1/16" as can be seen on the right of it on the picture).

i was wondering if anything can be done to fix this leak other than replumbing the pipes leading into the boiler, which would be a PIA. like maybe somehow bend the boiler side nipple straight so the joint sits OK.
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Last edited by amakarevic; 12-11-2011 at 04:54 PM.
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Old 12-11-2011, 04:59 PM   #2
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1" C-C union leak due to uneven joint


Rule #1 Never solder pipe to any union unless the union is assembled first.
If you try and bend the pipe it will throw off the alignment of the flange where the two come together.

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Old 12-11-2011, 05:18 PM   #3
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1" C-C union leak due to uneven joint


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Rule #1 Never solder pipe to any union unless the union is assembled first.
i did that, i.e. i assembled the union and tightened it before soldering. but the gap is so small (to the eye, not to the water) that i couldn't see it before closing the union. the nut went onto the threading like there was no problem whatsoever.
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Old 12-11-2011, 06:46 PM   #4
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1" C-C union leak due to uneven joint


looking at fitting on left side looks like alittle solder got on threads ....check that,,,and i find it hard to believe that you cannot tighten up that small gap with a 1" union....dope it up and tighten it up...there should be alittle give...
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Old 12-11-2011, 07:30 PM   #5
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1" C-C union leak due to uneven joint


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looking at fitting on left side looks like alittle solder got on threads ....check that,,,and i find it hard to believe that you cannot tighten up that small gap with a 1" union....dope it up and tighten it up...there should be alittle give...
Follow these instructions. If it doesn't work, reheat the pipe side of the union to help align it.
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Old 12-11-2011, 07:36 PM   #6
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1" C-C union leak due to uneven joint


thats all that can be done.......rember theres only one way the right way...
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Old 12-11-2011, 09:58 PM   #7
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1" C-C union leak due to uneven joint


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looking at fitting on left side looks like alittle solder got on threads ....check that,,,and i find it hard to believe that you cannot tighten up that small gap with a 1" union....dope it up and tighten it up...there should be alittle give...
YEP !!! that was it. but not on the threads but on the non-threaded half of the union, just under the widened collar, which was preventing the seal. heated and wiped it off, filled the system and we're good to go.

THANKS Y'ALL !!
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Old 12-11-2011, 10:01 PM   #8
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1" C-C union leak due to uneven joint


great you did a good job
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Old 12-11-2011, 10:04 PM   #9
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1" C-C union leak due to uneven joint


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great you did a good job
thanks to you, sir
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Old 12-11-2011, 10:06 PM   #10
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1" C-C union leak due to uneven joint


however, i even didn't have to dope it up. unions should have to need that, at least none that are done right, am i right?
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Old 12-11-2011, 10:13 PM   #11
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1" C-C union leak due to uneven joint


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however, i even didn't have to dope it up. unions should have to need that, at least none that are done right, am i right?
yes your right ...I always put alittle pipe thread compound ..non harding type to protect threads and make it easier to take apart...thats just me..
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Old 12-11-2011, 10:18 PM   #12
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1" C-C union leak due to uneven joint


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yes your right ...I always put alittle pipe thread compound ..non harding type to protect threads and make it easier to take apart...thats just me..
Not just you, me too

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