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>Hal, > >>As to the O2 clock, there's no problem. The O2PP for the first dive >>1.107ATA with a single exposure allowed of 3.5hrs. This was just a 20 min >>dive. The deco was less than 10 minutes on 80% O2 at 10fsw for an O2PP of >>1.3ATA with a total of 3hrs. max allowable. The dives were then seperated >>by over 2 hrs on air at the surface. The last dive was an O2PP of 1.51ATA >>for 20 minutes with 2hrs allowed. So each segment was well within limits >>and in total the limits were not exceeded. But not a bad question to ask. > > >I am not sure what CNS O2 limits you are using, but if your ppO2 for >the second dive was 1.5+ ATA, then you should use 1.6 as your limiting >value, and this (according to NOAA) has a single exposure limit max of >45 minutes, with the maximum of 2.5 hours allowed in any 24 hour period. >As I read the NOAA manual, their single exposure limits apply to >each anmd every single exposure made during a 24 hour period, and the sum >of those exposures are not to exceed the 24 hour limit. > >So, how are you calculating your CNS clock? Based on the single exposure >limits, or only on the 24 hour limits? Are you calculating recovery between >dives? If so, how? > >I am not thowing stones, but have noticed a trend for nitrox divers to >ignore the single dive limits (because they are very restricting) and >embrace the 24 hour limits instead. > >John John, The second dive was only 20 minutes of bottom time and the deco we did do was then at far less than 1.5ATA. So all the single dives were OK as compared to the single exposure limits and as was the total in the 24 hr. period.. Somehow I also knew you'd look at this closely since this is one of your area of expertise. Hal Harold Gartner 6900 Via Alba Camarillo, California 93012 home: (805) 482-9743 office: (213) 487-6240 CompuServe ID# 71470,1423 Internet: halg@ce*.ne*
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