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Bell tone test on a steel cylinder? That's neat.
The fact that you would fail a tank that just came back from hydro because of a subjectively measure audible noise during a VIP? Interesting...
Also, can dive shops even legally condemn scuba tanks?
no, one shop actually did X out all of the markings on one of the cylinders of a friend of mine and was promptly threatened to get sued if the shop didn't replace it. He got a new tank out of the deal. No one has the authority to legally condemn a tank outside of the hydro shops. All a dive shop can do is refuse to fill a tank, and refuse to put a sticker on it, that's it. Now as mentioned above, Bryan has a waiver with his customers that he is allowed to condemn gear. I personally wouldn't do that, all I would do is tell them that I can't service it, here is why, and recommend replacement, but to each his own.
Regarding the bell test. It is actually a good test to do prior to filling a cylinder. If it doesn't ring, it has a crack in it somewhere. This was done on rail wheels prior to scanning technology. You'd hit the wheel with a hammer and if it didn't ring, it had a crack in it somewhere. Tanks do the same. It's something that if you hear a dull thud, then something is clearly wrong somewhere. To what extent, and where, that is for you to figure out, but imo it is not something alone that can condemn a tank. Just a quick indicator to tell you something is wrong or not. Similar to guys health. If you don't wake up with morning wood, something is wrong. Doesn't tell you what is wrong, but tells you something is wrong and you have to go looking.