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Old 02-03-2016, 03:15 PM   #1
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Any issue re-doping gas lines?


I noticed the gas line going to my hot water heater has a slight gas smell around it. I tried leak detector but can't get any bubbles, but putting a nose right up to the fittings I found one that's markedly more noticeable.

Any harm in removing the pipes piece by piece to the fitting and redoping it back from that point?

Is there any trick to clean it the old dope off?
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Old 02-03-2016, 03:32 PM   #2
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Go ahead and take them apart--use dope and tape when you put them back together.

If that fails---replace the fitting that is leaking---
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Old 02-03-2016, 03:33 PM   #3
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There is one brand of pipe dope that has an odor similar to the chemical used in NG. If it doesn't blow bubbles it is a very tiny leak indeed. I suggest spraying all the fittings in the general area. I have also seen flex hoses have very tiny leaks in the pipe body. That one entertained for for quite a while before I found it.

If proceeding, no problem; iron pipe can be redoped and reused.
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Old 02-03-2016, 03:36 PM   #4
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Quote:
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Go ahead and take them apart--use dope and tape when you put them back together.

If that fails---replace the fitting that is leaking---
Dope and tape?
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Old 02-03-2016, 03:38 PM   #5
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I only use dope on iron pipe. BTW, a paper towel or rag will remove all the old stuff that really needs to come off.
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Old 02-03-2016, 04:26 PM   #6
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if spray doesnt show any bubbles, try dish washing soap and some water in a cup and with a brush lather up each pipe joint well and then look for bubbles, sometimes spray doesnt coat completely..
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Old 02-03-2016, 04:31 PM   #7
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it is ok to undo piping and reinstall it....shut of gas ...remove old pipe clean threads apply new pipe dope tighten back up ..turn on gas test for leaks
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Old 02-03-2016, 04:33 PM   #8
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Quote:
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Dope and tape?
I use both---perhaps over kill--but I got into the habit when runnig 4" threaded that was heated and pushing melted chocolate under high pressure---(don't ask--I've done some odd work in my life)
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Old 02-03-2016, 04:37 PM   #9
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its ok you use both tape and pipe dope....I don't because thats how i was taught and never had any problems...
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Old 02-03-2016, 04:51 PM   #10
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I never had a need before those 4" chocolate pipes---the small extra effort was worth it--4" is not fast or easy--and having to rework them due to seepage made the dope and tape worth while.
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Old 02-03-2016, 06:36 PM   #11
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Not sure if anyone else mentioned it but no tape or dope is used on flare fittings, dope alone or dope plus GAS rated tape can be used on others. Ron
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Old 02-03-2016, 07:23 PM   #12
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Quote:
Originally Posted by ront02769 View Post
Not sure if anyone else mentioned it but no tape or dope is used on flare fittings, dope alone or dope plus GAS rated tape can be used on others. Ron
says who? flare fittings for gas,use dope to help make the seal and help lube the threads...
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Old 02-03-2016, 10:00 PM   #13
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Quote:
Originally Posted by ShtRnsdownhill
says who? flare fittings for gas,use dope to help make the seal and help lube the threads...
Most dopes will eventually dry up then you'll have a leak. I use bearing grease (used to use hvac oil) on my flares.

Any issue re-doping gas lines?-image-2144774731.jpg

Here's a leaker from yesterday.

Last edited by hvac benny; 02-03-2016 at 10:07 PM.
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Old 02-03-2016, 10:51 PM   #14
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the pipe dope I use on any unions or flares is oil based and never dries up, yes many dry to a hard cracking piece of crapola..I use Hercules grip on any threads that never have to come apart, it stays slightly flexible forever.
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Old 02-04-2016, 03:27 AM   #15
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Quote:
Originally Posted by ShtRnsdownhill View Post
says who? flare fittings for gas,use dope to help make the seal and help lube the threads...
You get a big fat red check mark on that test question and stay out of the hydraulic department.
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