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On Thu, 13 Mar 1997, Art Greenberg wrote:
>
> - 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?)
I don't know of one.
> - Does this imply that steel cylinders used for O2 should be inspected more
> frequently than once per year?
I doubt that it would be nescessary. As long as the gas is dry and the
cylinder isn't drained I don't think it would rust that fast.
> - Since the rate of oxidation is related to PPO2, would it be wise to drain
> down and fill steel cylinders used for O2 service with OCA or any other
> suitable low PPO2 mix when not in use for a while?
Maybe not a bad idea. My nitrox instructor said that any steel nitrox
cylinders should be analyzed within 24 hrs of use to eliminate the risk of
a change in pO2 due to oxidation.
> - Does the way aluminum behaves imply that it's a bad idea to tumble
> aluminum cylinders used for O2 service?
If a cylinder needs a tumble to allow a good inspection then it should be
tumbled. The layer of oxidation on an Al cylinder is pretty thin anyway.
ooooO Bob
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