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Re: CO2 gone quickly


All the experts here advising the use of Teflon water-pipe tape make me
nervous about saying this: 

Don't do it!

Teflon cold-flows a bit and acts as a lubricant in threaded joints, so it
can actually help stop leaks. It's refusal to "wet" is why it is used for
*water* pipes and other liquids. Never, ever use it on high-pressure gas

The problem is that the tendency to shred can cause a catastrophe when some
bits eventually leak into a needle valve or regulator. It is better on the
low-pressure side of a regulator, but I'll use pipe compound there, rather
than risk a dead needle valve. Flare or compression fittings are better
anyway, for such service.

I learned this over 30 years ago, when I worked for HP Labs in Palo Alto.
After several disasters, it became company policy that teflon tape was not
to be used on any dry fitting, ever. AFAIK, the reason is still valid,
today. You may get away with it for years, but then...


Wright Huntley, Fremont CA, USA, 510 494-8679  huntleyone at home dot com

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