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--=====================_482516932==_.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Steve, Did you lubricate the o-ring when you reassembled them? This is a big no-no and can cause the o-ring to extrude. I have had a tank neck o-ring extrude on an Al80 in open water and the leak was surprisingly slow. I wouldn't want to make a blanket statement based on a single experience but it did make me feel better about this possibility in the cave. The major risk of a catastrophic gas loss is from the burst disk which is why we plug them for any type of real diving. Charlie At 09:07 PM 6/11/2001 -0400, Steve Schultz wrote: >Well, there I was, sitting at home talking on the phone about a math >assignment that I have due Wednesday, when I noticed that something was >sticking out between my tank and the valve. Upon closer inspection, I found >that it was the tank neck oring on my doubles that I had filled a couple of >days ago. A chunck of oring about a cm long was extruding. > >I've only been diving 8 yrs and have never seen this before. I figured that >I should crack my doubles to aleviate any remaining pressure. There was >none. They were bone dry. This sucks, but begs some questions that can >hopefully be answered by those who've seen this before. > >1) I've had about 20 fills on these doubles since I've broken then down last >for a vis. There were no problems at all with the previous 19 fills. Why >did this happen now, and not 19 fills ago? > >2) The tanks were overfilled by a mere 100 psi. This shouldn't be enough >for the oring to burst. If it was an overpressure problem (from heat or >magic or whatever), why didn't the burst disk go? I've heard that the disks >are unreliable, but I still have them on my manifold. > >3) How can I prevent this from happening again? > >4) If a tank neck oring bursts in a forest with no one there to hear it, >does it make a sound? Seriously, how loud would this have been? > >5) If this had happened under water, how much time would I have had to >isolate before complete gas loss? > >6) Comments? > >I'm going to break my doubles down after the assignment is due and look for >any rough spots on the tank neck where the oring sits. I'm also going to >pay special attention to make sure that it's seated properly. Any other >precautions I'm missing? > >ss > > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: quest-unsubscribe@gu*.co* >For additional commands, e-mail: quest-help@gu*.co* GLOBAL UNDERWATER EXPLORERS Training, Research, & Exploration phone: 386.454.0820 fax: 386.454.0815 web: www.gue.com --=====================_482516932==_.ALT Content-Type: text/html; charset="us-ascii" <html> Steve,<br><br> Did you lubricate the o-ring when you reassembled them? This is a big no-no and can cause the o-ring to extrude. I have had a tank neck o-ring extrude on an Al80 in open water and the leak was surprisingly slow. I wouldn't want to make a blanket statement based on a single experience but it did make me feel better about this possibility in the cave. The major risk of a catastrophic gas loss is from the burst disk which is why we plug them for any type of real diving.<br><br> Charlie<br><br> <br> At 09:07 PM 6/11/2001 -0400, Steve Schultz wrote:<br> <blockquote type=cite class=cite cite>Well, there I was, sitting at home talking on the phone about a math<br> assignment that I have due Wednesday, when I noticed that something was<br> sticking out between my tank and the valve. Upon closer inspection, I found<br> that it was the tank neck oring on my doubles that I had filled a couple of<br> days ago. A chunck of oring about a cm long was extruding.<br><br> I've only been diving 8 yrs and have never seen this before. I figured that<br> I should crack my doubles to aleviate any remaining pressure. There was<br> none. They were bone dry. This sucks, but begs some questions that can<br> hopefully be answered by those who've seen this before.<br><br> 1) I've had about 20 fills on these doubles since I've broken then down last<br> for a vis. There were no problems at all with the previous 19 fills. Why<br> did this happen now, and not 19 fills ago?<br><br> 2) The tanks were overfilled by a mere 100 psi. This shouldn't be enough<br> for the oring to burst. If it was an overpressure problem (from heat or<br> magic or whatever), why didn't the burst disk go? I've heard that the disks<br> are unreliable, but I still have them on my manifold.<br><br> 3) How can I prevent this from happening again?<br><br> 4) If a tank neck oring bursts in a forest with no one there to hear it,<br> does it make a sound? Seriously, how loud would this have been?<br><br> 5) If this had happened under water, how much time would I have had to<br> isolate before complete gas loss?<br><br> 6) Comments?<br><br> I'm going to break my doubles down after the assignment is due and look for<br> any rough spots on the tank neck where the oring sits. I'm also going to<br> pay special attention to make sure that it's seated properly. Any other<br> precautions I'm missing?<br><br> ss<br><br> <br><br> ---------------------------------------------------------------------<br> To unsubscribe, e-mail: quest-unsubscribe@gu*.co*<br> For additional commands, e-mail: quest-help@gu*.co*</blockquote> <x-sigsep><p></x-sigsep> <font size=2 color="#000080">GLOBAL UNDERWATER EXPLORERS<br> </font><font size=2>Training, Research, & Exploration<br> phone: 386.454.0820<br> fax: 386.454.0815<br> </font>web: <a href="http://www.gue.com/" eudora="autourl">www.gue.com</a><br> </html> --=====================_482516932==_.ALT-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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