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On Thu, 30 May 1996, Barrie Kovish wrote: > >Bernie wrote > > > >When Peter Ready let us drive the Prisim last year, I believe he was > >using 0.8litres per minute metabolic... > > Given this rather low number I assume that this was being used for > decompression calculations and not flow rate. What were the > circumstances of the dive, depth, time, work rate etc. > Do you know the mix and flow rate settings of the breather? > > Barrie > Sorry, I should have been more specific. The 0.8lpm figure was quoted by Peter during the 1/2 day introductory talk. It was given as a ballpark figure to a group of divers hearing about practical rebreathers (for most of us) for the first time. We then used the rebreathers in a pool only. "Diving and Subaquatic Medicine", quotes O2 metabolisation rates as ranging from between 0.8lpm and over 3lpm, with rates of over 2lpm "quite common" (these are based on swimming tests, breathing O/C air). The book goes on to say that: Typical gas consumption rates for a "slow swim" 0.5kt, a diver would be breathing about 20lpm of air, with an O2 consumption of about 0.8lpm (this magic number again), and 0.8 Knots = 30 lpm air breathed = 1.4 lpm O2 consumed 1.2 Knots = 50 lpm air breathed = 3 lpm O2 consumed. Regards, Bernie Woolfrey
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