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Seriously those 40 year old tanks can handle that much pressure 3000 psi or 3100. Wow yes that is nice 88 cubic feet is lovely.

So a 2250 psi tank should be no problem to fill to about 2800psi according to your experience

So what pressure would you cave fill those old steel 72s with 2250+psi rating? I got one from 1977 and inside is very clean and it would be nice to have 80 cf or gas in it. Can you go 2800psi and treat it as a 80 cubic foot tank? if yes can you let it sit for a week or more at those...

Thanks for your reply and good information. i like the extra 7.7 cubic feet of air because it give you not only 2.6 cu ft. of penetration but 2.6 for going back and plus 2.6 bigger reserve. All this counts. What if I did not care about the tanks life and just threw it away after 5 to 10...

I bought the yoke Mares prestige X15 first stage regulator set, 2 months ago. Would you assume that it is 3500psi or lower rated for? I am thinking of getting the DIN connection for it.

So what is your opinion about what would be a safe cave / technical fill for a new ish aluminum 80 tank if say one took the effort to use a high pressure valve rated to 3500psi or what have you. If 3AA steel tanks can be filled with 1.5 their working pressure then would it not make reason that...