[PSUBS-MAILIST] Commercial Grade O2 vs. Medical

[Sean T. Stevenson via Personal_Submersibles]

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On Jan 4, 2018, 13:12, Alan via Personal_Submersibles wrote: Steve, I just ran a couple of scenarios on tubes with differing aluminium grades in the free "under pressure" program. The results were exactly the same for internal pressure as external pressure. So if your medical tank is safe for 2000 psi internal it will be safe for 2000 psi external. plus there is probably at least a 100% safety margin so more likely it will crush at 4000psi or 8000ft. Perhaps Sean could confirm that with aluminium it is at least as strong under external pressure as it is under internal, then you won't need to do any calculations. Cheers Alan
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