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I will admit that I did not stretch the O-ring to see if it was cracked or rotted before installing it. When finished part of the O-ring was sticking out of the neck of the bottle. Many required stop dives are conducted with a pony. I do not believe that this is an unsafe practice as long as you are using the pony as an emergency air supply and it contains enough air for your return trip to the line and your required stops. If you do not do dives with required stops. You will still need to have a pony with sufficient air capacity to get you to the line and/or surface including safety stops. Anything less you will be dependant on your budy to save your butt, which is not the safest thing to do. Buddies are there for the "if all else fails" scenario. Good Diving by George --------- George Wentland wentland@ns*.ac*.no*.ed* On Fri, 15 Jan 1999, Art Greenberg wrote: > On 15 Jan 99 at 20:24, you wrote: > > > If you are doing required stop dives with a single it would be a > > real good idea to bring a pony. Not a little one either. The pony > > should be large enough to permit the return trip to the line and any > > required deco. If you try to get by with less you are risking your > > neck bigtime. > > I think we've excluded planned deco dives from this discussion. > > > The other day I filled my HP 100 cu.ft. tank with 3500 psi.. I > > put the tank on the boat in the shade. In about half an hour it > > started to leak from the tank O-ring (the O-ring between the tank > > and the valve). After leaking for about 2 min. half the O-ring blew > > out. I have never seen one of these O-rings blow before. It was > > visualed and the O-ring was replaced by myself 4 mo. ago. > > This is interesting, and the first case of anything like this I have > heard about (I'm certain there are others, but equally certain its > quite rare). How do you figure the O-ring came flying out? There's > normally no gap between the valve and cylinder where that could > readily happen unless the valve wasn't turned all the way in. Could > the O-ring have been defective, damaged or just not installed > correctly? How carefully did you inspect the O-ring before > installing it? > > > If this occurred at depth the air would have drained out but quick > > and if this was your sole air supply with a Y valve, you better find > > a buddy with lots of air to save your butt. > > Yup, no argument, this is one of those failures that is covered by > another team member. > > How long did it take for the cylinder to drain? > > While I'm thinking about this ... would the cylinder empty faster at > depth than on the boat? If so, why? > > Art Greenberg > artg@ec*.ne* > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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