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Old 01-12-2009, 06:22 PM
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Sealing Shop air lines

I've put together an air piping system in my garage out of copper line based on what I've seen here. However I used black iron reducers, nipples and ebows in the system and I'm having a problem sealing 2 of the connections where a black iron reducer goes into the copper threaded line. Anyone had problems sealing threaded iron to copper and what did you do. I have cleaned the joints twice and reapplied teflon it just won't seal.

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Old 01-12-2009, 07:28 PM
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I have not had the best of luck with teflon sealants on air lines and pipe threads. Try another sealant, more along the line of old fashion pipe dope.

Trees
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Old 01-12-2009, 08:16 PM
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I used all copper in my system but I had the same problem with leaks at the threaded joints. I agree with the previous poster. Use pipe dope. I used a teflon pipe dope. Seal the threads with the pipe dope and let them sit for 24 hours before you pressurize the system. Leaks gone!
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Old 01-12-2009, 09:01 PM
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You could take a small wire brush and lacquer thinner and clean them real good first, then the pipe dope. Most pipe has an oily residue on it.

Rob

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Old 01-12-2009, 10:02 PM
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use the pipe dope that is marked for gas lines..works a lot better..the one I get has a small brush in the can to apply the dope..

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Old 01-13-2009, 06:39 PM
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OK, The leaks are sealed with teflon pipe dope and sitting overnight. It may it's either going to set or freeze. Which one of you yankees let the cold air out.
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Old 01-13-2009, 06:53 PM
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Ol Skool Plumbing Trick. Go To The Plumbing Supply And Ask For A Roll Of Spoolwick And Some Pipe Dope Or Teflon Paste Is Ok. The Spoolwick Is A Heavy Thread Kind Of Material. Wrap It Around The Threads And Then Apply Some Teflon Paste Or Pipe Dope Tighten It Well And No More Leaks
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Old 01-14-2009, 07:39 AM
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So one note here. One of the leaks weren't from threads but the cast iron pipe plug blocking off one branch of the system. It was so porous that the air was going right through it. It took some detail work with a small brush and soap to find that one.
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Old 01-14-2009, 08:09 PM
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You guys are stuck in yesteryear....I have tried the teflon tape and sealer, with only limited luck....if you really want a joint that don't leak, perior...then use only Locktight Theadlocker, on clean threads, works like a charm.
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Old 01-14-2009, 09:28 PM
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Teflon tape is junk for airlines and the paste is not not much better. I always used plain old Pematex (non-hardening) gasket sealer, that stuff will seal some really bad threads.
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Old 01-15-2009, 07:19 AM
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I got it sealed. The paste worked.
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Old 01-15-2009, 07:50 AM
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i've been a plumber for 30 yrs seen all kinds of paste and tapes. i've pulled down hundreds of feet of leaking gas lines done by other guy's in my company and used spoolwick and dope and no more leaks . try it once and you will always use it very simple to do
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