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> Surely the manufacturer just makes a canister that will do the job for the > biggest user - i.e., someone who will take the VO2 to the max (see below)? And probably adds some extra conservatism on that. I guess my point was that if the rated total life of the canister is for the biggest diver at the highest workload, then those of us who just putter around collecting new species of critters might be throwing away absorbent that is only 10% used. The solution is to rate canister live in terms of O2 consumed, not in terms of hours. > For a fixed flow (constant mass) SCR that is essentially the same. You say > change the canister for every x hours dived which is bar/2 mins for the > Atlantis I using the 7.5 L @ EAN50. It's assumed that you've been using > the O2 at a constant rate, which will probably underestimate your actual > use. At high workloads, you're using more O2, and the absorbent gets used faster. At low workloads, you're using less O2 and the absorbent is used up more slowly (more excess O2 is dumped during loop venting). Sure, if you knew you would be doing a low workload you could drop the input flow rate and have some measure of canister life based on that, but if you want to make sure you don't go hypoxic, then you need the flow rate to be high in case you get into trouble and your metabolic O2 consumption skyrockets. Point is, unless you have a way to measure how much O2 your body is burning, then you don't really have a good way to estimate canister life. Rich
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