This refers to electrical pipe and not industrial plumbing pipe.
I beleive it is a lot easier to change the standard for electrical
installations, as these ones are usually either installed new or just
removed and never have to be partially replaced because they leak.
The electrical industry is already dominated by IEC standards as they have
proven to be superior to the NEMA ones. They must be moving "to the next
level" by upgrading the standard.
Plumbing is different though. Maintenance work would become a nightmare of
adaptors etc. As much as I would like to see a replacement I doubt there
would be one. The only way, would be to invent a totally new plumbing system
with different sizes and/or attachments which is superior to the existing
one.
A.
-----Original Message-----
From: see signature below [mailto:[EMAIL PROTECTED]]
Sent: Wednesday 07 March 2001 12:50
To: U.S. Metric Association
Subject: [USMA:11491] Re: NPT vs. PG
At 11:58 PM 3/6/01, you wrote:
>2001-03-06
>
>Recently while doing some spring cleaning around my office, I came across a
>technical data sheet from a company called Panel Components. You may visit
>their website at http://www.panelcomponents.com.
>
>Of interest was the catalogue on Strain Reliefs; Data Sheet 148, 4/1999.
>Note the following from page 2:
>
>NPT and PG thread types Compared
>
>Interpower(TM) strain reliefs are available in two different types of
>mounting threads: NPT and PG. NPT (National Pipe Thread) is the American
>standard. PG (Panzer Gewinde) is an European standard. PG threads are
>sometimes referred to as metric threading; however, these threads are not
>truly metric. There is a metric system of threading that is slowly
>replacing PG threads, but very few people have actually started using
metric
>threads at this time.
>
>Seeing that this catalogue is two years old, I wonder how far this true
>metric thread series has advanced. Has anybody heard of it? If you have,
>please post it here.
>
>BTW, for those who don't know German, Panzer Gewinde means armoured thread.
>
>John
>
>Keiner ist hoffnungsloser versklavt als derjenige, der irrtümlich glaubt
>frei zu sein.
>
>There are none more hopelessly enslaved then those who falsely believe they
>re free!
>
>Johann Wolfgang von Goethe (1749-1832)
See our page:
http://mdmetric.com/tech/thddat6.htm
which covers Pg threads
and our page:
http://mdmetric.com/tech/thddat10.htm
which covers the new Metric thread replacements.
Lee Sacks
from: Mr. Lee Sacks
MARYLAND METRICS P.O.B. 261 Owings Mills, MD 21117 USA
Ph: 800-638-1830 or 410-358-3130 fax: 800-872-9329 or 410-358-3142
e-mail: [EMAIL PROTECTED] url: <http://mdmetric.com>
