can you use a tank filled 14 months ago?

[the_cat_keeper]

I used my Nitrox tester to check the O2 levels and they were the same as a fresh fill.

So the air was dry and there wasn't any rust? Otherwise, theoretically, in the presence of oxygen and water, iron will oxidize to form rust and in the process, oxygen will be depleted.

2Fe(s) + O2(aq) + 2H2O(l) -> 2FeO.H2O(s)
4FeO.H2O(s) + O2(aq) + 2H2O(l) -> 2Fe2O3.3H2O(s)
FeO.H2O(s) + Fe2O3.3H2O(s) -> Fe3O4.4H2O(s)