DCIEM and USN Deco Table O2 Question

[nielsent]

So I have been reading over my DCIEM and USN air and oxygen deco tables. It appears that they are all setup for military surface support divers with a team, as they start O2 decompression as deep as 30 feet. This is well beyond the 1.6 PO2 for SCUBA tech deco gases. I am sure that it has its purpose for that type of diving, but I was curious how people are modifying these tables in order to dive them on SCUBA with 1.6 PO2 Deco Gas stops.

Thanks for your input.

 

[rjack321]

There are plenty of other tables and software models to use so modifying DCEIM isn't necessary (and probably not a good idea although the differences between deco on 100% at 30ft and 20ft are slight from an offgassing perspective)

 

[Kevrumbo]

Maximized O2 window/vacancy occurs at 3Ata. And keeping higher ambient pressure at a deeper depth helps in holding more inert gas in solution for more efficient washout at the lungs' alveolar bed via the venous return blood supply. However again as you noted, the recommended max PPO2 exposure is 1.6Ata due to the risk of Oxygen Toxicity seizures.

The only way around this is breathing O2 utilizing a full-face mask regulator with careful monitoring by dive support personnel at depth. And the only time you would want to do this from a recreational, non-military/non-commercial diver perspective, is if you were performing an emergency contingency In Water Recompression Therapy on a victim suffering from DCS. . .