Hi Didier,
Gas pipe, as far as I know is always tapered.
In Norway, Sweden, Denmark, Italy, etc... They use "gas pipe"
for hot water heating systems... only they use straight threads,
with a jamb nut to squash an O-ring up against the fixture.
The nut has a bevel that presses the O-ring into the pipe's threads,
and affects a semi-seal. It is a one time affair, and in my
experience lasts about two heating seasons before it starts
dripping. I guess a benefit is it keeps the room humidity up in the
winter... sigh!
-Chuck Harris
Didier Juges wrote:
Chuck,
In France, Gas Pipe threads are tappered. However, I do not remember if they
follow the Metric or British standard for size...
Didier
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chuck Harris
Sent: Tuesday, July 07, 2009 9:33 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 1" 14 tpi UNS die
Hi Dave,
That would 3/4 inch NPT (National Pipe Thread). In the UK it
is known as "Gas Pipe". As far as I can tell, it is standard
the world over.
There are some differences, that won't matter in your
application. In Europe, NPT is frequently not tapered. This
is apparently the result of not understanding that tapered
pipe thread is self sealing. As a result, there have been
all sorts of o-ring jamb nuts and other insane stuff done
"over there" to try and form a temporary seal... but I digress.
-Chuck Harris
David C. Partridge wrote:
<http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf>
is where I
got the specification for the thread from.
Pipe has O.D. of 1".
Dave
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