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Harrison, Do a survey of your local gas supplier. If they are buying Helium in bulk or their supplier is filling ALL Helium high pressure tanks from the same bulk system, then it doesn't matter what grade you buy. It is all coming from the same source. Thirty years in the gas business and we found that it was cheaper to buy the highest grade bulk gases we could and fill all our tanks. Our industrial O2 was 99.9999 pure (we filled UHP, Med, Aviators, and all other grades from the same tank). We held this true for argon, nitrogen, helium and all other gases we bought in bulk and transfilled into the T,K,S,Q series of HP tanks. Good luck, Steve Wilson on 4/2/02 3:19 PM, Harrison at harrison@ge*.co* wrote: > 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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