How long can air be stored in a tank?

[Panama Jones]

Sorry if this sounds stupid but two questions.

1. A properly filled tank is extremely dry air in a sealed, pressurized container. What makes it go stale?
2. Someone said that they used a 15 month old tank, very dry but usable or something like to that extent. How did it get dryer?

 

[spectrum]

I regularly dive air from steel/aluminum cylinders that may easily sit from November to June and frequenly longer with no observable effects. That is consistent with all tecnical expectations.

Where you have 2 cylinders and one has fresher air you do want to be using the older air for the first dive of the day. That will............... Nah, forget I even went there.

Enjoy your new cylinders.

Pete

 

[PfcAJ]

Its fine.

Go dive, VIP it, fill it, go dive some more.

 

[KeithG]

13 minutes and 47 seconds. I read that on the Internet some where.

But seriously folks, where are you getting your "fresh" air from?

Here in Toronto I would rather breathe 15 year old air than the stuff we now have floating around...