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From: "Harrison" <harrison@ge*.co*>
To: "TechDiver" <techdiver@aquanaut.com>
Subject: Helium content
Date: Tue, 2 Apr 2002 14:19:32 -0700

Hi list.

I'm wondering what grade of Helium people are using?  I "believe" welding
grade Helium is approx. 99.997 pure, as opposed to 99.999 UHP.  With that
said, that "could" leave the .003% as CO.  If that's true (and my math is
correct), that "could" make the CO content of welding grade Helium around 30
ppm to start with.    If I remember correctly, I heard that OSHA limits a
person's CO exposure to something like 50 ppm.  Somethings gotta be wrong
cause that would limit my dive to around 25 feet.  Any info would be great.

Thanks,
Harrison



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