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TOPIC: dissolving rate Confusion over accelerated decompression
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Ian Hodge (Visitor)
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dissolving rate Confusion over accelerated decompression  
I have been wondering about something that I hope someone can help me with. I am trying to understand a bit more about decompression theory and have a problem which I hope is best illustrated with an example. I dived breathing air dives to 30m. They are dive for 17m. Using the half time constants for compartment 2 of the pressure of nitrogen in their blood will be 25.4 msw (2.54 bar). If I understand M values correctly this means they can in theory acend to the surface without the need for a stop. Again if I undertand correctly this means that there can be up to a 17.5 msw (25.4 - 7.9) difference in the absorbed vs inhaled pressure of nitrogen without a significant risk of getting a bend. However this diver decides to stop at 6 m and breath pure O2. At this stage they are breathing gas with 0 msw pressur of nitrogen so the difference is 25.4 (25.4 - 0), which is 45% greater than at the surface. I undertand that this will increase the rate of off-gasing but does it not increase the chance of getting a bend? I hope this isn't as silly a question as I fear. Thanks Ian
 
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dissolving rate Confusion over accelerated decompression
Ian Hodge 2010/02/23 13:17
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Nigel Hewitt 2010/02/23 13:17
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Iain Smith 2010/02/23 13:17
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Ian Hodge 2010/02/23 13:17
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Nigel Hewitt 2010/02/23 13:17
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thread linkthread link dissolving rate Confusion over accelerated decompression
Ian Hodge 2010/02/23 13:17
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Nigel Hewitt 2010/02/23 13:17
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