Flying after diving if computer shows all compartments cleared?

[tursiops]

just return 18 hours (DAN's repetitive dive guideline).

Unfortunately, that is just DAN-US's guideline.

 

[LFMarm]

Is it possible to calculate the benefit of O2 administration on surface for a certain amount of time? This is what I do with the leftover O2 bottle after my last dive but not sure if it’s meaningful or just a waste of time.

 

[dmaziuk]

Is it possible to calculate the benefit of O2 administration on surface for a certain amount of time? This is what I do with the leftover O2 bottle after my last dive but not sure if it’s meaningful or just a waste of time.

You can plug 0%N2 into Robert's formula referenced upthread ("theoretical diver" link) with all the attendant caveats, or you can assume that it is safe to fly when you're in the pressure group "none" and solve for the length of SI that takes you "practically there"(*).

*) Because off-gassing is a log curve that will never touch the asymptote, mathematically you can never get back to "no pressure group" if you dived even once in your lifetime.

 

[lowwall]

*) Because off-gassing is a log curve that will never touch the asymptote, mathematically you can never get back to "no pressure group" if you dived even once in your lifetime.

That must be why it feels so good to get back to depth after a long break from diving. It's all those billions of cells that never reached ambient sighing in relief.

 

[NDonahue]

Just noticed that longer dives yield a "Danger" group identifier. While that's unsurprising when pretending a multi-level dive occurred at max depth, the estimated flight time seems to ignore that dive (and is dangerously early). In such cases, it's probably best to punt and just return 18 hours (DAN's repetitive dive guideline).

Agreed. I think this is only useful for low altitude ascents (eg driving). The Danger is triggered when the Bot time + resid nitrogen time exceeds max bottom time at the max depth.