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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 Yeah, glad you brought it up, i almost forgot about both incidents... in my limited experience, about twenty five years of diving, i have personally seen two valve o rings pop while under pressure: the first, a neck o ring, happened about ten years ago while filling a steel 72 in a vat of water: the o ring blew at about 2100psi, it took about five seconds to empty the tank (and the vat).. i couldn't tell if my pants were wet from the water or something else... the other people in the shop wouldn't come back in even after i explained it wasn't my fault. the other more recient, the orfice o ring, was in my shop one year ago, it was on a brand new (one month) aluminum 50 that was filled to three thousand psi that i had used for demo in an open water class. (i had forgotten to shut off the valve after the demo) the security company called and woke me up at about 1am and said the alarm had gone off.. when i got to the shop the tank was wet from condensation and the reg first stage was loose... whew !! as you say... a new paranoia, every time i pass the 300fsw mark i see that little wet tank and go over my manifold switches in my head... > the thought of the 3000 psi on my back atempting to make an exit thru > a hole that large is disquieting. remember that the valve will still be blocking *most* of the hole, but still, in my experience, it will only take about four or five seconds for the tank to drain.. gulp.. Are they routinely changed when a tank is > visually inspected? YES, when a vip is done properly both valve orings should be changed. sea ya, dennis pierce > > Dave (Great, a *new* paranoia) Ventre > Quincy, MA > -- > Send mail for the `techdiver' mailing list to `techdiver@opal.com'. > Send subscription/archive requests to `techdiver-request@opal.com'. >
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