mrdeux said:
The bottle was steel. It had been serviced only a few weeks prior to the incident, presumably corrosion would have been detected at that time...after all, it is the sort of thing they're looking for.
AFAIK they don't remove valves and check for water/moisture/corrosion internally in DBO (dry breathing oxygen) bottles. Oxy cylinders are assumed to have 100% integrity internally. They're checked externally for damage.
BUT, how much humidity do you need in a 100% pressurized oxygen environment for corrosion to take-off?