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Old 10-05-2009, 11:31 AM   #1 (permalink)
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Whats the best thread sealant for natural gas lines?

I need to repair some natural gas lines at our business that are black pipe. Whats the best paste sealant for natural gas? Thanks.
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Old 10-05-2009, 11:32 AM   #2 (permalink)
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Either tape or dope for NG.

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Old 10-05-2009, 11:33 AM   #3 (permalink)
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My step-dad is a plumber...we use teflon tape and then "Pro-Dope" on top of the tape...

Pro-Dope is in a yellow can and can be picked up at a Winnelson or similar commercial plumbing supply.


EDIT: ProDope is made by Hercules chemical company...it is gray. You don't HAVE to use the tape with it, but on an old joint (repair) or on a coupling (known to be leak prone) we always used both and tested them to 35psi.

EDIT: PIC....
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Old 10-05-2009, 11:40 AM   #4 (permalink)
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I've used the extra thick (yellow) teflon tape with fine results.
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Old 10-05-2009, 11:45 AM   #5 (permalink)
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yellow teflon tape stuff.
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Old 10-05-2009, 11:46 AM   #6 (permalink)
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Old 10-05-2009, 11:49 AM   #7 (permalink)
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Permatex teflon pipe dope. When you do not want it to leak.
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Old 10-05-2009, 11:52 AM   #8 (permalink)
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heat shrink tubing and a lighter.
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Old 10-05-2009, 11:57 AM   #9 (permalink)
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Permatex teflon pipe dope.
I've used the extra thick (yellow) teflon tape with fine results.

Both of these work good. BUT wrap the tape on opposite dirrection of the threads.
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Old 10-05-2009, 11:57 AM   #10 (permalink)
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I like to sweat solder the lines myself.
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Old 10-05-2009, 12:01 PM   #11 (permalink)
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Quote:
Originally Posted by Alfred W. View Post
Permatex teflon pipe dope.
I've used the extra thick (yellow) teflon tape with fine results.

Both of these work good. BUT wrap the tape on opposite dirrection of the threads.
If you are looking at the end of the pipe, "clockwise"....and apply the pipe dope in the same direction as the tape...or it will unravel it.
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Old 10-05-2009, 12:18 PM   #12 (permalink)
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I use regular old pipe dope. If the connection leaks then I didn't wrench it hard enough.
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Old 10-05-2009, 12:26 PM   #13 (permalink)
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White teflon tape is used about 99% of the time offshore in the oil and gas field.
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Old 10-05-2009, 12:28 PM   #14 (permalink)
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I know how to wrap tape....have always used rector seal but have found a few leaks in some old lines.
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Old 10-05-2009, 12:37 PM   #15 (permalink)
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Quote:
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I know how to wrap tape....have always used rector seal but have found a few leaks in some old lines.
I used to use Rectorseal, but it dries out, the Permatex stuff doesn't as it comes in a tube that can be sealed up well.
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Old 10-05-2009, 12:40 PM   #16 (permalink)
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heat shrink tubing and a lighter.
This
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Old 10-05-2009, 12:40 PM   #17 (permalink)
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Old 10-05-2009, 01:15 PM   #18 (permalink)
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I've had really good luck with this stuff: http://www.gasoila.com/products/item...adsealant.html

I've seen 2" fittings crossthreaded together and still sealed with it... LOL
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