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On Fri, 10 Jun 1994, Tim Olson wrote: > > It seems to me that there are a lot of worried people out there. > >From the current discussion about valve o-rings and burst discs, it looks like > many people must actually not spend much time working on equipment. If a neck > o-ring is properly torqued and lubed, you can basically ignore it as a major > safety hazard. If you replace Burst discs at every hydro (better every year), > you have minimal (although important) risk UNLESS you overpressurize them. If > a cylinder is to be overpressurized, the unorthodox (sp?) practice of replacing > the disk with a stronger one, or double stacking them should probably be used. > As for the valve face o-ring...if you are using the standard U.S. valve over > 3000-3500psi, I personally feel you are acting unwisely, as a DIN valve will be > much better at preventing failure of this o-ring...they are made for higher > pressures. This more or less summarizes why I: 1) don't loose any sleep about the neck o-ring in my nitrox cylinder and feel that a y-valve provides adequate redundancy in that case; 2) don't over-pressurize my tanks; and, 3) have converted all of my valves (except the O2 pony bottle) to DIN Aloha, Rich
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