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Sealing pipe threads

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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Sealing pipe threads

Unread postAuthor: tyrant_bb » Thu Jan 20, 2011 1:41 pm

To seal pipe threads, especially steel, I have to put it in a vice and then use a huge pipe wrench to really apply force until it finally seals. The thing is, I'm making a piston valve gun out of steel pipe, how can I access the piston and at the same time have that joint seal completely
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Unread postAuthor: jrrdw » Thu Jan 20, 2011 2:32 pm

Thread tape, (Teflon Tape).
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Unread postAuthor: linuxexorcist » Thu Jan 20, 2011 2:34 pm

Are you using [url=en.wikipedia.org/wiki/Thread_seal_tape]Teflon Tape[/url]? If you are, are you using enough? [youtube]http://www.youtube.com/watch?v=abxPHIXrqpU[/youtube]

That should give you an idea as to how much
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Unread postAuthor: Labtecpower » Thu Jan 20, 2011 2:50 pm

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Unread postAuthor: tansit234 » Thu Jan 20, 2011 2:53 pm

Pipe dope, I like the kind with teflon shreds in it. Works better than the tape which gets shredded by anything but brass and plastic fittings.
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Unread postAuthor: saefroch » Thu Jan 20, 2011 3:07 pm

Apply the tape correctly and it doesn't get "shredded." I'm currently under the impression that the entire tape is teflon. It's called PTFE tape, and PTFE = polytetrafluoroethylene = teflon. Right?
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Unread postAuthor: tyrant_bb » Thu Jan 20, 2011 3:26 pm

Of course I'm using teflon tape, I thought that's only a lubricant though, and the pipe seals when you tighten it so much that it deforms the threads. I would think doing that time after time it would eventually lose it's seal?
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Unread postAuthor: saefroch » Thu Jan 20, 2011 3:57 pm

Teflon tape is not only a lubricant. It does also lubricate, but it is intended to make the threads seal. Deforming the threads with two unlike metals like brass and steel may result in a permanent connection. Deforming the threads is not advisable. In addition, this may result. That was just using small hand tools, no vice.

Every time you unscrew the threads take off any excess that's hanging around and wasn't in the connection and apply new.
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Unread postAuthor: lemming124 » Thu Jan 20, 2011 6:56 pm

I was having trouble with teflon on galv steel pipes. Try the pink teflon that's intended for gas, it's a fair bit thicker and won't be chewed up by threads.
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Unread postAuthor: velocity3x » Thu Jan 20, 2011 7:28 pm

This product ALWAYS works and as I recall, it's rated to 3500 psi.

Loctite ® 55™ Pipe Sealing Cord
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Unread postAuthor: Lockednloaded » Thu Jan 20, 2011 8:05 pm

as long as you're applying the tape correctly, It will work on even large diameter steel fittings. I've never had one leak on me with properly applied pipe tape.
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