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Dr Andrew Pitkin wrote: > > While causually reading the CDG manual the other day, I came across Reverse > > Gas Diffusion - the claim was that when diving specifically on Heliox, > > ... > > I was unable to find this in the latest (1990) CDG manual - which > page number? Chapter 6: Mixed Gas Diving, page 174, of the loose-leaf copy. "... The problems of reverse-gas helium diffusion, where denser nitrogen can hinder the expulsion of lighter helium from the tissues, exceed acceptable safety margins." It has been a while since I read it but I remember a few dubious statements. The most notable mistake I remember was in the instructions for using the Buhlmann tables included at the the back. BTW, there is a set of Buhlmann air tables which seems to be in fairly wide-spread use in central Scotland with a mistake in the longest time given for 45msw: the 27 should be 30. Alan alan@mi*.de*.co*.uk* awright@gs*.bt*.co*.uk*
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