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String:In theory it'll last indefinitely if fill from a reliable source.
khacken:The problem is that oxidation will comsume the oxygen in the air. The recommendation from NAUI is to store the tank partially filled, and get a fresh fill before the dive.
khacken:The problem is that oxidation will comsume the oxygen in the air. The recommendation from NAUI is to store the tank partially filled, and get a fresh fill before the dive.
OH-JJ:Read the aforementioned thread, basically if you adhere to annual V.I.P.s then you will have no problem as it takes more than a year for rust to have an real effect on the O2 content.