plclark196
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Anyone ever know of either happening during a dive???
Tank neck O ring or burst disk failure....
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Yes. I know of burst disks failing during dives.
I have seen a couple over the last 22 years - but in both cases it was a slow stream of bubbles not a catastrophic loss of gas.
fppf
Contributor
I had a neck oring let loose with a steel tank sitting in my hallway.
It took about 5 minutes for a half full tank to vent so you would still have time to react to it.
I was planning on draining the tank and replacing it, you could see the oring starting to fail.
The valve was not torqued enough.
It took about 5 minutes for a half full tank to vent so you would still have time to react to it.
I was planning on draining the tank and replacing it, you could see the oring starting to fail.
The valve was not torqued enough.
The only one I've seen fail (a very small sample set, indeed) was on a cylinder just before a dive. The burst disk blew, and all conversation stopped for a bit -- it was *loud*. :biggrin:
I've had a couple o-rings fail on my doubles manifold, but that was from not taking proper care of it.
The first time I read about something like this (burst o'ring) happening UW, it left me with the impression that once it happens you are completely cut off from your air supply. Reading about similar incidents leads me to believe otherwise. As of yet, I have never heard about any incidents regarding a burst disk UW. It's a little scary either way. Anybody with first hand knowledge? Sorry, not trying to hijack.
Blowing the neck O-ring will have no effect on the breathing ability of the reg, other than the obviously earlier depletion of the tank. The two paths are independent.
Blowing a yoke face O-ring seems to be the closest analogue to blowing a burst disc. In both cases, the air rushing out will be going through at least a portion of the valve (i.e. the dip tube and however much more). It's certainly possible to continue to breathe when you blow the yoke face O-ring (tried that underwater), but I have never actually had the pleasure of having a burst disc go while I had a reg on a tank. I suppose Bernoulli effects could potentially come into play, depending on the design of the valve and its burst disc assembly.
Perhaps it'd be possible to get a very low pressure burst disc assembly and rig a fill system through the HP port on a regulator. Fill until it gives way (preferably under the service pressure of the tank), cut the feed, and breathe off the regulator. That would give you a direct experimental answer for a given valve type.
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