[time-nuts] 1" 14 tpi UNS die

[Chuck Harris]

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: time-nuts-bounces at febo.com 
>> [mailto:time-nuts-bounces at febo.com] 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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> 
> 
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