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In message <Pine.SOL.3.92.960602184054.1966D-100000@hs*.us*.ed*>, "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*> writes >Chris, > >In reply to, > >On Sat, 1 Jun 1996, Chris Hellas wrote: > >> The trick before ascent is to flush the loop prior to commencing your >> ascent. This is done by inhalling the loop and exhaling through the nose >> three times. This should bring the FI O2 back up to something like even >> if you have been exercising hard. As far as generally exercising hard >> goes,the guy's @ Draeger are quite adamant that even with a metabolic >> oxygen consumption of 2.5 litres per minute (which is quite high!) the >> FO2 in the loop should not drop below 18 percent when the 50 percent O2 >> orifice is used. I have not seen any data relating to the other orifices >> - I'll do some digging. > >Where does this come from? It's not in the info that Uwatec/Drager is >circulating with the Atlantis in the US. Standard part of end user training in the UK (cert is IANTD). > I agree with you that exhaling >through the nose before ascending is the way to deal with this. My problem >is that sometimes you can ascend faster than planned ;-) Exhaling through the nose during ascent arrests any increase in ascent rate - planned or otherwise! > and it would be >nice to know what the machine's parameters were, before such an event >happens. Agreed. - The situation I guess would be as per Draegers original stance as regards loop FO2. Regards Chris Chris Hellas e-mail:- chris@de*.de*.co*.uk* ********************************************************************************
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