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- From: gregr@cs.su.oz.au (Greg Ryan, g10b, xtn 4809)
- Subject: Re: dangerous misconception (was Re: Human bodies explode...)
- Organization: Basser Dept of Computer Science, University of Sydney, Australia
- Date: Tue, 17 Nov 1992 03:27:56 GMT
- Message-ID: <1992Nov17.032756.5278@cs.su.oz.au>
- References: <1992Nov16.145952.5495@mailer.cc.fsu.edu> <1992Nov16.074547.5322@nntp.uoregon.edu>
- Sender: news@cs.su.oz.au (News)
- Lines: 24
-
- In article <1992Nov16.145952.5495@mailer.cc.fsu.edu>, mayne@phi.cs.fsu.edu (William Mayne) writes:
- > While on the subject of dangerous misconceptions, oxygen toxicity
- > doesn't kick in suddenly at 298', nor does it usually strike without
- > any warning. One widely accepted standard is that anything over
- > 1.6 ATA of O_2, which is 218 fsw on air, is risky, particularly
- > if exposure exceeds 45 minutes. Even more conservative rules are
- > prudent. Note that I said it doesn't *usually* strike without
- > warning, not that you can count on getting any warning. But since
- > it can happen at much less that 300' and there may be some warning
- > symptoms it is wise to know the symptoms so if you are pushing the
- > limits, or start to have problems within the usual limits (which is
- > possible), you can abort the dive. Don't ignore or fail to recognize
- > symptoms in the belief that there is never any warning.
-
- I concur with all that Bill has said on this.
-
- The current IAND teaching practice is to limit "recreational"
- (their term) dives on Nitrox to a PPO2 of 1.5 ATA, and "technical"
- dives (deep, staged deco, Nitrox and/or O2 deco) to a PPO2 of
- 1.4 ATA.
-
-
- Greg Ryan gregr@cs.su.oz.au
-
-