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Old 06-27-2010, 06:11 PM   #1
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Black Pipe Union (1-1/2") leaking


I'm running 1-1/2" natural gas line (black pipe) for a whole house generator. I can't seem to install a union that doesn't leak. I'm on my 3rd union and they all leak in the same place.....the compression part. No problem with the ends of the union that are threaded onto the mating pipes, but it appears I can't tighten the compression part enough to create a leak proof seal. What am I doing wrong. First union was purchased from the Home Depot (could be lower quality). Second from Loews (probably same quality). Third was purchased from a plumbing supply (Aarons). They all leak exactly the same. Any ideas or suggestions?

Thanks in advance!

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Old 06-27-2010, 06:37 PM   #2
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Black Pipe Union (1-1/2") leaking


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Originally Posted by g-dub View Post
I'm running 1-1/2" natural gas line (black pipe) for a whole house generator. I can't seem to install a union that doesn't leak. I'm on my 3rd union and they all leak in the same place.....the compression part. No problem with the ends of the union that are threaded onto the mating pipes, but it appears I can't tighten the compression part enough to create a leak proof seal. What am I doing wrong. First union was purchased from the Home Depot (could be lower quality). Second from Loews (probably same quality). Third was purchased from a plumbing supply (Aarons). They all leak exactly the same. Any ideas or suggestions?

Thanks in advance!
You are using some of the liquid pipe dope on the threads, use a little on either the male or female or where the two parts come together.
A plumber tough me that little trick years ago on unions that where not sealing right and having to use mega to maybe stop the leaking..

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Old 06-27-2010, 07:21 PM   #3
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Black Pipe Union (1-1/2") leaking


I used Blue Block pipe dope on the ends of the union that connect to the pipe. No leaks there. I did NOT use any pipe dope on the threaded part the pulls the compression pieces together, figuring the seal was made by compression.
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Old 06-27-2010, 08:39 PM   #4
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Black Pipe Union (1-1/2") leaking


X2 on the pipe dope idea.
If your piping isn't aligned 100% you're going to have issues. Put a little dope on the mating surfaces and tighten it down as tight as you can get it without cracking it.
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