HEY BOGIE.
Good question. My opinion;;;;;; you dont leave tanks on full presure for storage. metel has to relax sometine. There is somewhere a thing about storing less than 50 lbs psi. that is not for protecting the the material from presure. i has to do with corrosion. steel rusts in o2 environment the higher psi the higher the ppo2 and the faster the rusting process. So i think that is the real reason for storing at lp and not working psi. most willl not see anything in the tank as most fills are good dry air, however a damp fill could do you in over time. i have not seen problems in my tanks having them full for a year and the o2 is good when i test them prior to use but i now make it a practice to run them down to <100 for the rusting issue. one never knows what he got filled with the last time. besides who needs a "BOMB" in the closet. Especially if your dive site has a good filling service.
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How long is it safe to store air in your scuba tanks?
How long is it safe to store air in your scuba tanks safely without resupplying with fresh air?
I personally would not use air that was over 60 days. (just my preference)
How does Oxygen content degrade in stored scuba tanks? You start with an air fill with the normal 21% Oxygen. If you store a full tank for 3,6, or 12 months does the Oxygen content decrease? What if stored longer 2, 3, 5 years? Does temperature, moisture, or other factors contribute? What about type and physical make up (steel, AL, composite) of the tank? Are there other factors (rust, organic growth etc.) that can make the air unsafe?
Do the other gases of air in the tank change concentration? (Nitrogen, carbon dioxide, argon)
Are there any scientific studies on this?
dioxide, argon)
Are there any scientific studies on this?[/QUOTE]