On Thu, 9 Jun 1994 4700gbera@um*.cc*.um*.ed* wrote: > A participant in an ongoing thread re redundancy mentioned, in passing, > the possibility of failure of a cylinder's neck o-ring. I've never > even heard of this happening. Has anyone experienced this? I confess that > the thought of the 3000 psi on my back atempting to make an exit thru > a hole that large is disquieting. Are they routinely changed when a tank is > visually inspected? > > Dave (Great, a *new* paranoia) Ventre > Quincy, MA Dave, I'm the one who mentioned it in passing. No, I've never heard of it happening. It's the only "tank-level" failure I can conceive of that should even be mentioned in a discussion of redundancy. (in other words, carrying a second tank of a particular mixture to compensate for the primary tank rupturing is likely a waste of time: I seriously doubt that a diver attached to a ruptured tank would live long enough to worry about an alternate breathing source.) IMO, the probability of a tank/valve o-ring failing during the course of a dive is so tiny that I don't worry about trying to compensate for it when thinking about components of dive equipment to back-up. Aloha, Rich
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