I dont think it would be a tube change. I think It would be a internal arm change. As scuba gear life suport. They all should be checked & calibrated at the factory. And if you had to worry about a screw up like that i would not put my name on it.
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"few"? In my part of Europe, 300 bar tanks are quite common.the few people in Europe that actually have that high of a pressure tank.
Not noticeably more than 232 bar (3350 psi) tanks. And 200 bar (2900 psi) tanks are basically only available used, in reality they're slowly being phased out and the only reason I see them is that tanks have a long life.Thy got to be expensive.