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Thanks Charlie, I used a little spit on the rings when I reassembled them. We all know the WKPP's view on burst disks. What is GUE's official position? ss ----- Original Message ----- From: Charlie Roberson <charlie@gu*.co*> To: Steve Schultz <se2schul@st*.ma*.uw*.ca*>; <quest@gu*.co*>; <techdiver@aquanaut.com> Sent: Monday, June 11, 2001 10:39 PM Subject: Re: So I got home and my tanks were empty... > 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 > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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