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It is all helium - all the same. The gas companies will usually only sell the triple vacuumed stuff ( UHP) due to the diving accidents of the usual assholes here in Florida. There is nothing else in the helium, so don't worry about it. All comes from the same fucking tank - go to the gas company and look if you don't believe me. Tell them this bullshit and watch them roll on the floor. -----Original Message----- From: Harrison [mailto:harrison@ge*.co*] Sent: Tuesday, April 02, 2002 4:20 PM To: TechDiver Subject: Helium content 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 -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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