The safety of any gas cylinder depends largely on the storage
conditions it's seen.
In the case of oxygen, be sure that the valve area does not have any
flammable materials on it. Any petroleum product is a significant
risk. Oxygen will support fire in the presence of a fuel (petroleum
product) and heat.
Has the tank been stored in a dry location? Any rust on the tank
makes it immediately suspect - especially if the rust is near the
valve. Is your regulator in good condition? Do you have flashback
arrestors installed? Check valves? Are your tanks chained to a wall
or other well secured structure?
Check out http://www.aws.org/technical/facts/FACT-28.pdf and related
articles in the AWS web site.
Finally, the best inspection is done at a professionally equipped
Get the tank hyrdotested. There is regular period for this to occur.
You are probably past that time.
Paul Finelt, CIRM
Also ...http://www.aws.org/technical/facts/FACT-30.pdf covers