I would be a little cautious with the idea of using pressure vessels that have been used for more than say 5 years.
I think you may find over their life the bottles being filled and exhausted many times may suffer from material fatigue, they may appear OK. But on a microscopic level may have started to break down undermining their integral strength.
This in turn means they could fail with disastrous consequences, when they are in the process of being filled after a fight when they are still very cold! This is when the material would be most brittle, and when you people are holding the things.
and I could be standing close to you at the time. :shock:
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