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Re: Teflon Tape

Date: Fri, 08 Aug 2003 08:24:51 -0700
From: "Sherlock Wong" <s_wong at aristoslogic.com>
Subject: Teflon Tape

A plumber at Home Depot told me that teflon tapes does not seal the
joint. When a coupling is tightened, it generates heat, which makes it
to tighten fully. The teflon provides lubrication, allowing the coupling
to be
tightened fully.

And it is impossible to wet, so water cannot get past it if it just fills most of the space between the threads. It is fairly worthless for gas lines, and has a tendency to shred and clog needle valves or other downstream devices with such small apertures. Use a paste thread goop for gases.

When I worked at HP Labs, the company had issued an edict that no teflon tape was to be used on *any* plumbing except water lines. It had caused no end of problems with lab gear. [Downright dangerous problems, in some cases.]

Normally, with plumbing, overtightening is bad. But I think that CO2 is different, by tightening the coupling, you are compressing the washer into the groove on the tank valve. To compress the washer takes alot of force on the wrench.


The beer supply place where I get my CO2 refilled said to put all my
on the wrench to tighten the nut.

Soap tests will confirm that this is often needed.


Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514