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At 06:21 PM 3/12/97 -0800, Bob Favorite wrote: > As far as steel vs. Al for O2 the increased O2 content can cause >rusting and the rusting uses up the O2 resulting in decreased pO2. Al >will stop rusting once a surface layer of oxidation has formed but this is >not true for steel it will continue to rust until all the metal present is >oxidized. Bob, An interesting point, which raises questions: - 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?) - Does this imply that steel cylinders used for O2 should be inspected more frequently than once per year? - 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? - Does the way aluminum behaves imply that it's a bad idea to tumble aluminum cylinders used for O2 service? =Art= -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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