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>- Is there a rule of thumb (or anything more precise than that) that says >how long a steel cylinder can be used for O2 service? (IOW, what's the >expected lifetime in O2 service vs. expected lifetime in air or other low >PPO2 service?) The H tank I use for welding and nitrox mixing was first hydroed (+, too) in 1940. I've got a steel Scot aviation O2 set that dates in the 60's. My gas supplier (Merriam Graves) no longer used alu tanks at all for 02, even in the tiny med sizes (damn, they are much nicer for emergency kit), for reasons that seem to change everytime I ask. So O2 is going to destroy your steels, at least you've got time to squeeze in a few dives first. The CGA warning a while back about steel tanks, incidently, was about industrial tanks that were being used underwater, completely emptied, and hooked and unhooked wet. Now can somebody explain why it's cool to use Farbers for O2 but not steel 72's? -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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