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I see the difference. Don't think that I filled the AH cylinders lightly. I fill them after seeing them filled by others, for clients well known to me who ask me personally. I would not buy AH cylinders for my use, because I do understand the hazards associated with them. I only use the comparison of the spheres because they carry the exact certifications that the hoop wrapped cylinders do, that is, none (as far as a fill station and transportation used in commerce are concerned in the USA)Frank
So as to be perfectly clear a whole world of difference between a TAVCO Mil spec Inconel 718 sphere and a cylinder out of China being certified QA by a muslim modest clothing head dress shop out his back bedroom in a Sweedish housing estate with tanks imported from China
Again I am happy to discuss the design, QA indipendent testing and evaluation of both the TAVCO
and The Carlton Spheres we can discuss the material, welding procedure and QA qualifications all the way back to the mill that provides the metal.
But I repeat the Add Helium statement they made in writing:
"In the case of these tanks, we do not import them from China directly. We purchase them from a European distributor who has them made to their specifications for use in diving applications and for use with 100% o2, and does their own QA." (Peter Sotis Add Helium)
Again a world of difference between a TAVCO and this unverified, uncertified and possibly counterfeit junk.
Just a pity you cant see the difference. Iain