On 19 Nov 2005 07:13:17 -0800, wood email@example.com wrote:
It isn't - it works fine. You can even use it on oxygen systems.
You might need (or be required by local bylaws) to use the high density
PTFE tape for sealing flammable gas systems in your locality (yellow
spools in the UK) rather than the "water grade". The cost is only
trivially more so many people only use the "gas grade" for everything.
Remember too that PTFE thread sealer tape is only useful on tapered
threads, not parallel threads (there needs to be some compression) and
it's certainly not useful on metal compression joints, metal face joints
or around metal olives. If you're using parallel threaded pipe, use a
liquid sealer that sets.
Hmm... metal olives - quaint term. I believe I'll have one of those
in my next Martini. Shaken, not stirred...
(I know what you are referring to, just never heard them called that
before - you're in the UK, no?)
No, those are "flares" - I think the terminology is the same. An olive
is the loose ring that's used in some other types of joint. They can
either be soldered in place (an old sort of flare) or they're
sharp-edged and used on soft copper pipe with a compression fitting.
LOL. I didn't know they had a name. I've always called them "the
compression ring". Let me check the Web.
Compression ring is the American jargon.
Adding "olive" to the same google search, produces some UK sites.
olive = compression ring
BTW...it appears that
Spanner = Pipe wrench
Not really. We do use "spanner" much more commonly than wrench, but
rarely in plumbing. A ratchet wrench uses a "socket" but the common
double-ended workshop tool is always a "spanner" (except amongst
muzzleloaders with wheellocks). For the sort of adjustables used in
plumbing we generally call them "waterpump pliers", "Moles", "Stillsons"
(tradenames) or just "adjustables", sometimes wrenches but almost never
I've seen "spanners" used on bicycles, cameras, old computers, and
telescopes. These have fixed "C" shaped jaws with pins along one
side. The pins interlock with holes or depressions around a
ring-shaped nut. Other spanners have a ring-shaped business end to
wrap around a strange shaped collar.
Here's some examples:
For motorcycle shocks:
Lock rings, as seen on cameras and old computers:
On Sat, 19 Nov 2005 22:18:39 +0000, Ba r r y wrote:
Those are "pin spanners" and they are not always of a fixed span. I have
several adjustable pin spanners that either hook into the face of a
shallow ring that's been drilled to accept the pins or with a single pin
meant to wrap around the outer edge of a ring that has been drilled on the
edge (usually at several locations) to accept the pin.
I formerly worked as both a machinist and as a die-maker. Working to
international standards (British, German, Japanese, American, French) will
definitely cost you a BUNCH of money in tooling!
A Stillson is a pipe wrench (it's intended for gripping pipes, not
really flat-faced nuts) but they always have asymmetric vee grooves cut
into the faces. They need a certain amount of wedging action to work,
because their jaws aren't parallel. Without the teeth I doubt they'd
grip at all.
It's generally a good guide to not trust any British domestic plumber
wielding a Stillson. We don't use the large threaded connections where
they'd be appropriate and they're infamous for chewing up the soft brass
fittings we do have. A plumber with a Stillson probably has a horse and
a stetson too.
I use Teflon tape everyday at work. ( 31 years as a Pipe fitter). We use
it on any threaded connection. On air lines, especially instrument air
lines, you have to be careful not to allow any of the tape to extent over
the ends of the threads. This could let lose pieces of tape come off and
enter the air system. Lose pieces in the system can stop up air ports or
any filters in the system. If you are concerned about this possibility
you can buy liquid Teflon in a tube from HD or any hardware store.
In reality the Teflon in not a sealant. It is an anti-galling compound
that keeps the male and female thread from galling together (welding
together by the heat of friction) when you tighten the connection up.
The source of the comment should be enough to ignore it. Its a bogus
comment. Even the idea of removing all the factory compound and
redoing all the joints is weird. Did they repaint the compressor as
You'll do fine with Teflon. I believe the comment from the person who
is a pipefitter is as well founded advise as you could get.
There is a thicker Yellow colored Teflon Tape that is made for gas
connections. I have been using Teflon tape on compressor fittings and air
hose fittings for years however the Yellow stuff is much easier to work with
as it tends to not stick back on itself.
The problem with teflon is the failure mode. When it lets go, it sends
millions of razor sharp shards of teflon in every direction at 850
miles per second. You definitely should take out all your teflon and
replace it immediately. It's like having a bomb in your shop waiting
to go off. Now I've never known anyone personally who was killed by
exploding teflon, but I don't want to be the first. :)
"We should be careful to get out of an experience only the wisdom
that is in it - and stop there; lest we be like the cat that sits down
on a hot stove-lid. She will never sit down on a hot stove-lid
again---and that is well; but also she will never sit down on a cold
one anymore." - Mark Twain
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