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All of the reg failures that have seen have been second stage freezing. On examination post dive, the second stage is full of ice and the intermediate pressure is at the set psi. If the psi had gone up this would suggest 1st stage failure. I haven't seen one of these. I like the conshelf because it works. It may be helped out because of the metal 2nd stage that doesn't insulate the reg. I now that's thin, but the reg still works all the time. As for the Odin I haven't had it under the ice but the last cold water trail, 40* F in river with10 knot current, working it extremely hard, performed as it should. This past spring a buddy and I were diving the St. Mary's river 2 or 3 times a week. It was fun to watch the submerged ice coming out of the generating station. The idea caught on and we would bring divers for their 2 minute dive that end with the free flow. I don't remember any of the models but the dacors wouldn't make it to the water and the sherwoods would last long enough to get you wet. The funny thing is that these divers with the poor equipment still use it. I use rule # 1 all the time now, but unfortunately the one local dive shops still actively promote dacor & Sherwood. This does limit the amount of dive buddies in the area. These dives, would by this listserv, would be considered rec. dives Technically speaking divers up hear use mostly Odins(75%) or Scuba Pro. I see the odd cyclone and one guy uses Mares. I have not seen a Poseidon fail. On the other hand I have seen the SP free flow, not all the time but often enough to remember. The SP free flows have all been in the summer and start at depth. They usually start to fail at 150' to 180' on the way down. This is real scary because when you think about it, that reg was at 80*F 2 minutes ago. Just my $0.02 on cold water regs, since this is almost all the diving that I do. Randy Sullivan Sault Ste. Marie, Ont sulteck@ic*.ne* -----Original Message----- From: Sean T. Stevenson <ststev@un*.co*> To: Randy Sullivan <sulteck@ic*.ne*>; techdiver@aquanaut.com <techdiver@aquanaut.com> Date: Saturday, January 10, 1998 9:01 PM Subject: Re: ICE dives aren't Cave dives >Good points, but I think we're going off on a bit of a tangent. For commercial or SAR work, we can >use bandmasks, helmets, comms, hot water suits, surface supply and as many people as we need >topside. This thread started (I think) adressing only recreational type ice diving on SCUBA. For >this type of diving, FFM's are a bad idea as you stated because of their tendency to freeflow. I >have to question your assessment of regulator failures in your post. Nearly all of the failures I >have observed originate in the second stage, and I use SP MK 20's as firsts with no problems. >Dacor is crap, but one of the Sherwood models (maximus, I think) has a proven track record with the >US antarctic diving program. > >-Sean -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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