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Take great care when using overprssure masks in a chamber with oxygen rich gas. The reason why is obvious.... at least avoid all sources of combustion, leaks, and sense environmental oxygen, have a system of flushing the chamberatmosphere. Matthias Isaac Callicrate schrieb: > > Breathing resistance in your delivery system can cause a lot of problems > namely CO2 buildup but when you are dealing specifically with pulmonary > issues the downward spiral is both breathing resistance and O2 damage will > reduce inspiration(not a popular word on this list for other reasons)volume. > If your working diver friends are doing dives that require that extensive > deco then they should be increasing a constant ventilation at all stops with > increased PO2. I doubt that they are using a non-positive pressure hat. BIBS > masks in a habitat or chamber should be in excellent condition before > starting a dive or treatment. I have never seen any problems attributed to > breathing resistance on a BIBS mask. For recreational diving with extended > times dont get stingy with your deco regs. One of the few selling points of > rebreathers is lack of breathing resistance so you could buy on for deco. > Also while the sharpshooters are still busy lock & loading, you could try a > positive pressure FFM, Interspiro AGA, EXO-26 etc. Okay their kicking in the > door now I only have seconds ... You could mate a Cressi sub FFM with a way > overtuned 2nd stage reg and .....AAAHHHHHHHHHH...... > > THIS IS THE CENTRAL SCRUTINIZER, ISAACS DOMICILE HAS BEEN SEARCHED AND ALL > WE FOUND WAS HIS PADI OWSI CARD AND APPROXIMATELY 612LBS OF POSEIDON REBUILD > PARTS. QUESTION, HAVE YOU OR ANYONE ELSE BEEN DIVING 80/20 TO 30'?? HAVE A > NICE DAY > > >From: "johnny christensen" <johnny_chri@ho*.co*> > >To: icallicrate@ho*.co* > >CC: techdiver@aquanaut.com > >Subject: RE: Dr Black/ChamberHaters > >Date: Wed, 12 Dec 2001 00:34:15 > > > >Hi Isaac > > > >3 years back I used to do dives that required 1-1½ hr on 80%. > >On a couple of ocations I stayed 2½ hrs on 80% just to see when any > >pulmonary symptoms would begin. No gas breaks done. In these exposures > >there > >was really no significant symptoms. > > > >When I do pure O2 now, I get the symptoms after 30-40min. There I'm doing > >15 > >/ 3 gasbreaks (but using the 50% decogas to "break" on) > > > >From my chamber experience and talking to comercial divers, the inhalation > >resistance on the O2 reg or mask, has a major influence on how your lungs > >are going to feel afterwards. > > > >BTW, no agency is using Navy tabels anymore. I think even TDI stopped 2 or > >3 > >years ago. > > > >Regards > > > >Johnny Christensen > > > > > >>From: "Isaac Callicrate" <icallicrate@ho*.co*> > >>To: trey@ne*.co*, techdiver@aquanaut.com > >>Subject: RE: Dr Black/ChamberHaters > >>Date: Tue, 11 Dec 2001 12:48:16 -0500 > > > >-snip- > > > >>>Im interested to hear if any of the IANTD's on the list have done a > >>long > >>enough exposure to see pulmonary issues on 80/20? I hope Im not the only > >>one > >>getting something out of this. (Everyone take a turn squeezing more out of > >>Trey while he is feeling generous) > >>Thanks > > > > > >_________________________________________________________________ > >Chat with friends online, try MSN Messenger: http://messenger.msn.com > > > >-- > >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > _________________________________________________________________ > Join the worlds largest e-mail service with MSN Hotmail. > http://www.hotmail.com > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.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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