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Old 02-04-2016, 04:57 AM   #16
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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---
Tape rated for gas. Not all tape is.
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Old 02-04-2016, 05:01 AM   #17
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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.
I tape and dope anything over 1-1/4".
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Old 02-04-2016, 06:22 AM   #18
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if anyone is messing around with gas they should have some knowledge and mechanical ability..of the product they are working with..if not ..they really should not be doing it.... I always said gas is not a diy project because you need to be certified to work on it...but here at the diy forum nobody wants to hear that .... tape, pipe dope, flares, all part of the trade that requires knowledge of how and why and when they are needed....
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Old 02-04-2016, 06:48 AM   #19
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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?
To test a fitting you believe may be leaking but doesn't bubble, I call it a balloon test, can be made using saran wrap and duck tape. After being applied it will balloon over a short period of time if there is a leak.

But my favorite leak detector is a product called Snoop. A couple of drops will do it to it.
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Old 02-04-2016, 07:36 AM   #20
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You get a big fat red check mark on that test question and stay out of the hydraulic department.
the question was for natural or propane GAS carrying lines not hydraulic lines, yes no foreign material on liquid lines to clog pumps or filters..but this thread is not about hydraulics..is it?
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Old 02-04-2016, 07:40 AM   #21
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To test a fitting you believe may be leaking but doesn't bubble, I call it a balloon test, can be made using saran wrap and duck tape. After being applied it will balloon over a short period of time if there is a leak.

But my favorite leak detector is a product called Snoop. A couple of drops will do it to it.
Yeah ok, you can get an air tight seal with plastic wrap and duct tape..thats more than laughable.......you get the red check now..
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Old 02-04-2016, 08:06 AM   #22
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Yeah ok, you can get an air tight seal with plastic wrap and duct tape..thats more than laughable.......you get the red check now..
Yes I can, good nuff for a leak test. Some people have more skills than others. Thanks for the compliment.
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Old 02-04-2016, 08:16 AM   #23
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I'm dealing with 1/2" black pipe, so I don't know how much pipe tape and dope i can fit.

Interesting about the dope drying in time. We've been framing down there, so it's possible one of the pipes was jarred enough to crack the dope and lead to a small leak.

I wonder if I'm better off with tape going forward? Does it have the same tendency to dry with time?
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Old 02-04-2016, 08:24 AM   #24
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Yes I can, good nuff for a leak test. Some people have more skills than others. Thanks for the compliment.
hmmmm..good nuff for gas lines......if your so worried about a leak, the best test is to cap off all the lines and put a pressure test on, pump the pressure up to 5 pounds and both watch the gauge and now soap the lines with the higher pressure...
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Old 02-04-2016, 08:26 AM   #25
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Originally Posted by gizzygone View Post
I'm dealing with 1/2" black pipe, so I don't know how much pipe tape and dope i can fit.

Interesting about the dope drying in time. We've been framing down there, so it's possible one of the pipes was jarred enough to crack the dope and lead to a small leak.

I wonder if I'm better off with tape going forward? Does it have the same tendency to dry with time?
thats what happens some times, vibration can cause a leak, you should for saftey and peace of mind, pay a licensed plumber to put a pressure test on the entire gas piping in the house..that will find ANY leak, even little ones...
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Old 02-04-2016, 08:40 AM   #26
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Have you ever read a problem of someone getting fittings loose? I'm sure you have and if tape only had been used that wouldn't have been a problem 30 years later.

I've never used anything but tape on pipe threads with pressures from a vacuum to 1,200 psi and never used anything but white tape. White was all that was available in those days.

We ain't being helped any with today's global market either. Fittings being made in a half dozen foreign countries with loose quality control constraints makes for thread sealing more difficult.
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Old 02-04-2016, 08:46 AM   #27
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hmmmm..good nuff for gas lines......if your so worried about a leak, the best test is to cap off all the lines and put a pressure test on, pump the pressure up to 5 pounds and both watch the gauge and now soap the lines with the higher pressure...
Yes, and I've been there done that too on 8" lines to 1,200 lbs. hydro testing with a pump that was very similar to a grease gun.
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Old 02-04-2016, 08:53 AM   #28
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Have you ever read a problem of someone getting fittings loose? I'm sure you have and if tape only had been used that wouldn't have been a problem 30 years later.

I've never used anything but tape on pipe threads with pressures from a vacuum to 1,200 psi and never used anything but white tape. White was all that was available in those days.

We ain't being helped any with today's global market either. Fittings being made in a half dozen foreign countries with loose quality control constraints makes for thread sealing more difficult.
agreed on the crap pipe and fittings..try threading home depot black pipe compared to a plumbing supply house pipe..HD is junk...
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Old 02-04-2016, 08:56 AM   #29
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Originally Posted by SeniorSitizen View Post
To test a fitting you believe may be leaking but doesn't bubble, I call it a balloon test, can be made using saran wrap and duck tape. After being applied it will balloon over a short period of time if there is a leak.

But my favorite leak detector is a product called Snoop. A couple of drops will do it to it.
did you know that most plastic including saran wrap and zip lock bags allow air and oxygen to diffuse through them, just like pex pipe without an oxygen barrier..so how can you check for a small leak using such material...no sarcasm intended...
only the special vacuum bags made for vacuum sealers will not allow air to diffuse through it..
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Old 02-04-2016, 03:27 PM   #30
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Originally Posted by gizzygone View Post
I'm dealing with 1/2" black pipe, so I don't know how much pipe tape and dope i can fit.

Interesting about the dope drying in time. We've been framing down there, so it's possible one of the pipes was jarred enough to crack the dope and lead to a small leak.

I wonder if I'm better off with tape going forward? Does it have the same tendency to dry with time?
Technically, neither the tape not dope is suppose to be sealing the pipe/threads. They are tapered threads, they seal to themselves. The tape and pipe dope are for lubricating the threads so you can tighten them.

1/2", pipe dope or tape is fine. 1/2" is easy to tighten.
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