No New Dope On Gas Leak Fix, How Long Will It Last? - HVAC - DIY Chatroom Home Improvement Forum


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Old 09-23-2012, 04:41 PM   #1
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No new dope on gas leak fix, how long will it last?


I recently had my gas pipe fixed. The contractor took apart, redoped and put back together several leaking/loose couplings. There is one leaking pipe-coupling connection where he could not remove the pipe, so he only retightened the pipe one full rotation without applying any new dope.
My question is how long will this particular connection last? Is it likely that it will leak again in the near future because of the lack of new dope?

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Old 09-23-2012, 06:39 PM   #2
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No new dope on gas leak fix, how long will it last?


If he could get a full rotation on the pipe that was leaking, it sounds like the pipe was loose. If that pipe was originally doped and was only loosely tightened, then fully tightening is an acceptable practise if it then stops it from leaking.

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Old 09-23-2012, 07:25 PM   #3
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No new dope on gas leak fix, how long will it last?


Pipe dope is only for lubricating the threads to allow the pipe to be tightened enough to seal. The pipe dope does not actually seal the pipe.
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Old 09-23-2012, 07:54 PM   #4
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No new dope on gas leak fix, how long will it last?


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Originally Posted by hvactech126 View Post
Pipe dope is only for lubricating the threads to allow the pipe to be tightened enough to seal. The pipe dope does not actually seal the pipe.

I concure. it will be just fine...
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Old 09-24-2012, 09:40 AM   #5
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No new dope on gas leak fix, how long will it last?


Thanks guys.
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Old 09-24-2012, 12:34 PM   #6
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No new dope on gas leak fix, how long will it last?


To verify all the leaks were property fixed, have your local utility come out with a hand "sniffer" and check for leaks. Better to be safe than sorry!....
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Old 09-24-2012, 12:45 PM   #7
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No new dope on gas leak fix, how long will it last?


According to wikipedia..."pipe dope" is both a lubricant and a sealant. Just interesting but not really pertinent to this thread?


http://en.wikipedia.org/wiki/Pipe_dope
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Old 09-24-2012, 02:51 PM   #8
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No new dope on gas leak fix, how long will it last?


Most references I have seen say that the variation and coarseness of pipe threads require dope to get a positive seal. I am not a pro and in the few gas jobs I have done I have had only one leaking joint (tiny, tiny leak) and it did not respond to extra tightening. I had to take it apart and redope it. But like the guys say, the real test is if it is leaking or not. If not, you are good to go.
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Old 09-24-2012, 03:29 PM   #9
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No new dope on gas leak fix, how long will it last?


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Most references I have seen say that the variation and coarseness of pipe threads require dope to get a positive seal. I am not a pro and in the few gas jobs I have done I have had only one leaking joint (tiny, tiny leak) and it did not respond to extra tightening. I had to take it apart and redope it. But like the guys say, the real test is if it is leaking or not. If not, you are good to go.
They checked it, it's not leaking now. I'm not sure how long the fix will last though
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Old 09-24-2012, 05:53 PM   #10
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No new dope on gas leak fix, how long will it last?


Every gas leak I ever repaired was due to someone relying on the pipe dope to seal the joint and not tightening the joint enough, Don't loose sleep over this...you will be long gone before it ever leaks again if it was tightened properly.
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Old 09-24-2012, 06:07 PM   #11
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No new dope on gas leak fix, how long will it last?


The male ends of the pipe are slightly tapered so if it's tight it won't leak. Don't worry about it.
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Old 09-25-2012, 02:57 PM   #12
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You guys are awesome, I appreciate the help.
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Old 09-25-2012, 06:03 PM   #13
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No new dope on gas leak fix, how long will it last?


Except for electrical conduit. Pipe threads are tapered, both the male and female threads, they form an air and liquid tight metal to metal seal without a sealant. Pipe dope, or thread lubricant is needed to reduce friction while tightening.

Thread sealants are used/needed on non tapered threads to make them air and liquid tight.

PS: Some electrical companies do use tapered threads, but it is not required.
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Old 09-25-2012, 10:08 PM   #14
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No new dope on gas leak fix, how long will it last?


Quote:
Originally Posted by techpappy View Post
According to wikipedia..."pipe dope" is both a lubricant and a sealant. Just interesting but not really pertinent to this thread?


http://en.wikipedia.org/wiki/Pipe_dope
Wikepedia is a pseudo encyclopedia...it's full of opinions and half facts.
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Old 09-25-2012, 10:40 PM   #15
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No new dope on gas leak fix, how long will it last?


The hell they will seal, pipe dope is need to seal the pipe tthreads on gas, water and air! The threads are tapered so they tighten up. If pipe dope was just to lube the threads, the cutting oil would do to seal the joint!

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