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In message <Pine.SOL.3.92.960602184807.1966E-100000@hs*.us*.ed*>, "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*> writes >Chris, > >How did you personally arrive at a plan max pPO2 of 1.4 ATA? > > >Either there are data to show that diving at a pPO2 from 1.3 to 1.59 ATA >is not safe or there are not. There is plenty of data from both military and civilian sources. The problem with this is that we now see second generation people who are digging into the farthest corners to pull spurious pieces of info. The data has been confirmed by people in the know (Dr Hamilton et al) - for sure you will always get people outside the demographic curve that will tox at lower PpO2's - the same people crash cars for no aparent reason etc. > No way I am going to believe someone who >says that they've always done ot that way before. In my business, that >kind of talk often has preceded stupid mistakes that cost lives. I just >don't want it to be mine. With air it wasn't an issue, most people never >get to 186 fsw (1.4 ATA) let alone 218 fsw. That is not true. Most people state this - ask again and you will find most people have an injection of narcosis bravery sooner or later. >But with nitrox, suddenly high >pPO2s are now well within the reach of Joe Diver. That should read 'trained Joe Diver' > >If manufacturers or the dive community are not prepared to speak up then >empiric evidence will win out - the equivalent of using the public as >crash test dummies. I don't care if a few survivors/machos/foolish have >been able to avoid an O2 hit - if 1.4 and above is dangerous, people will >be injured and nitrox, diving and rebreathers will take the rap. > >Well that's my opinion. What's yours? Different to yours, but then I am what you may consider 'survivor/macho/foolish' . But I know one thing rebreathers are a whole level above OC nitrox. So the phrase 'do it right, or don't do it' takes on a whole new meaning. Regards Chris Chris Hellas e-mail:- chris@de*.de*.co*.uk* ********************************************************************************
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