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plumber's vs. Gas type

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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plumber's vs. Gas type

Unread postAuthor: koolaidman » Sat Feb 16, 2008 11:52 pm

quick question. Is it ok to use regular plumber's teflon instead of the one for gas? (the white tape instead of the yellow)
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Unread postAuthor: Pete Zaria » Sat Feb 16, 2008 11:54 pm

For what application?

I use the regular white Teflon tape with brass and PVC fittings, for low-to-medium pressure applications with no problems.

I wouldn't use it on an unregulated CO2 system but shy of that I think the regular teflon tape is fine.

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Unread postAuthor: koolaidman » Sat Feb 16, 2008 11:58 pm

its gonna be for steel, iron, and copper, up to 200 psi maybe (air.)
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Unread postAuthor: Pete Zaria » Sun Feb 17, 2008 12:01 am

I've used the white teflon tape on brass up to and over that pressure before.

Try it and see if it leaks at all (use soapy water or etc.. to test). I like 2-3 wraps of teflon tape, and two wrenches to really tighten down the fittings. If it doesn't leak, you're good :)

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Unread postAuthor: Gippeto » Sun Feb 17, 2008 3:01 am

White teflon is fine. I use it to 7000 psi on a regular basis for hydraulic applications. Save the gas stuff for gas apps.
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Unread postAuthor: SpudMonster » Sun Feb 17, 2008 4:01 am

White works fine. Just give it a few extra wraps.
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Unread postAuthor: DYI » Sun Feb 17, 2008 9:52 am

Gippeto, this is a gas application. He's using air, not hydraulic oil.

And the tape on the joints on my SCTBDC is white teflon tape. As a general rule, I use about 120" of tape on a 2" fitting. 1/4" fittings seal perfectly with only 18" or so. I go through tape quickly, but everything seals fine.

The only yellow gas tape I've seen around here was only rated for 100 psi.
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Unread postAuthor: bigbob12345 » Sun Feb 17, 2008 10:18 am

I always use the white stuff because its $1 for a 260in roll and the yellow gas stuff is $3 for a 200in roll. Ive never had any problems with leaks from it except on pvc fittings but i probaly just didnt put enough.
i have used the gas stuff before because i just had some laying around and I actually had problems with getting it to seal.
Ther is also that pink stuff which is even more expencive but Ive never tryed it.
the white tape is better and cheaper.
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Unread postAuthor: Gippeto » Sun Feb 17, 2008 12:27 pm

My bad.

How about..."Save the expensive colour coded teflon tape for applications which require a colour code." :D

Use yellow for natural gas

Use green for oxygen

Use which ever you want on air, water and apparently nitrogen too. :)
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Unread postAuthor: D_Hall » Sun Feb 17, 2008 12:40 pm

One thing to keep in mind....

Strictly speaking, the teflon tapes aren't supposed to be sealants. They're supposed to be dry lubricants that allow you to tighten the pipe threads properly, blah blah blah.

Anywho, a trick I picked up back when I used to tinker with paintball equipment: Forget teflon tape. Go get yourself some blue Loc-Tite. Use it liberally on the threads in question.

I've had plenty of joints leak when using teflon tape. I've NEVER had a joint leak with Loc-Tite.


Note: The above trick applies to metal construction only. With PVC? Yeah, teflon tape.
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Unread postAuthor: Monkey621 » Sun Feb 17, 2008 2:44 pm

If you use Loc-Tite its a pain in the a$$ to unscrew the joints if you change your mind later on. Especially on larger fittings. With paintball the average connection size is 1/4" or 1/8" NPT and the pressure is usually 200-800psi when full, so you need the Loc-Tite on certain paintball applications where teflon won't cut it.
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