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> 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. No way I am going to believe someone who Before anyone really gets their knickers in a twist over this; this statement is wring; there can be one set of data and two views on safety. The usual meaning in scuba terms is 'generally acceptable risk.' None of the debate on here has given any of us the real information; no-one has posted protocols and results up here. None of us really care so much as to look the damn stuff up ourselves. What we see are lots of people bulling about 1.4 vs 1.6 vs 0.7 vs 2.0 vs pi. *This* discussion is setting 'safe' limits. In other words, a safe limit is what level of O2 is acceptable to my community, not what level of O2 produces what level of hits. And for what it's worth, one case of a hit at 1.3 is really not very many and is not likely to affect discussions of 1.6 vs 1.4 very much *in the absence of any other information*. Same goes for EADs. The accepted level is being set by peer pressure *in this community* at (a very sensible) 130 ft (appx 40m). The fact that other communities set it in arnage from 60 ft to 200 ft is by the by. 130 is *safer* than 200, 60 is *safer* than 130. It is only group consent which tells us which is *safe*. So yes, there are data, and no, they don't show what is safe, until you tell us what safe is. regards, Jason > 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. But with nitrox, suddenly high > pPO2s are now well within the reach of 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? > > Peter > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'.
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