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Date: Wed, 23 Jul 1997 09:43:26 -0400
From: Paul Bowers <pbowers@mi*.ca*>
Organization: Chaos Central
To: Andrew Cohen <Andrew.Cohen@no*.go*>
CC: Return requested <techdiver@aquanaut.com>, pbowers@mi*.ca*
Subject: Re: CGA 500 VS. CGA 540

Andrew Cohen wrote:
> 
>      Anybody know the difference between CGA 540 fittings (oxygen) and CGA
>      500 fittings (medical gas)?  They seem to be the same size.
>      Andy Cohen

They're not, if I am to beleive the Victor catalog that is open before
me. CGA 500 has a .885" (nominal) thread pitch, CGA 540 is .598". The
difference has to do with medical vs. industrial installations, and is
also related to O2 cleaning requirements that the industrial gas
industry follows...not to be confused with O2 cleaning of divers' tanks,
which apparently is unwarranted and a matter of personal choice.

If you're REALLY interested, I could scan-in the tech drawings for these
fittings and the relevant portions of CGA G-4.1, NFPA 50 and NFPA 53M
(but I might get in shit for doing so).

Paul "Useless Industrial Gas Guy" Bowers

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