Kevrumbo
Banned
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Look at the Bottom Mix Gas used in the NEDU Study (essentially Deep Air):
Of course you're going to have significant residual inert Nitrogen, potentially on-gas N2 at your deep stop and perhaps even at intermediate deco stops on Eanx50 which may encroach on critical slow tissue M-values --if you were using a working bottom mix with a high fractional N2 content to begin with like Air. Plan accordingly, use a computer to track your inert tissue loading (i.g. Shearwater Petrel) and be prepared to extend your 6m depth 100% Oxygen deco profile along with a stand-by In-Water-Recompression Table as a DCS treatment contingency if necessary should you choose to use Deep Air on mandatory decompression dives, especially on multiple dives per day consecutively over a week or more (i.e. like an "Expedition Trip"). Better yet, take a day-off to further purge those slow tissues of residual N2 after three or four consecutive days of decompression diving. . .
This is the simple point to take away from the study:(Abstract, p.i)). . .Divers wearing swimsuits and tshirts, breathing surface-supplied air via MK 20 UBA, and immersed in 86 °F water were compressed at 57 fsw/min to 170 fsw for a 30 minute bottom time during which they performed 130 watt cycle ergometer work. . . Results indicate that slower tissue gas washout or continued gas uptake offsets the benefits of reduced bubble growth at deep stops.
(Conclusion p.18) The practical conclusion of this study is that controlling bubble formation in fast compartments with deep stops is unwarranted for air decompression dives.
Of course you're going to have significant residual inert Nitrogen, potentially on-gas N2 at your deep stop and perhaps even at intermediate deco stops on Eanx50 which may encroach on critical slow tissue M-values --if you were using a working bottom mix with a high fractional N2 content to begin with like Air. Plan accordingly, use a computer to track your inert tissue loading (i.g. Shearwater Petrel) and be prepared to extend your 6m depth 100% Oxygen deco profile along with a stand-by In-Water-Recompression Table as a DCS treatment contingency if necessary should you choose to use Deep Air on mandatory decompression dives, especially on multiple dives per day consecutively over a week or more (i.e. like an "Expedition Trip"). Better yet, take a day-off to further purge those slow tissues of residual N2 after three or four consecutive days of decompression diving. . .
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