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> > one of the other interesting things i learned from rich today was that > the co2 loading is related to the rate of production more than the limit > of the canister.. uh, that is to say that if you are under stress or > working hard the canister, when it's new, will handle the load, but as you > load up the absorbent it's ability to handle heavy loads decreases. > therefore when you reach the limit of your canister you arent forced from > the water on the spot, you just have to slow your work load or production > of co2. i dont think this means to push it, just that the world doesn't > end when you reach that point. > > i was speaking with a owner of a 15.5 today and he told me a story about > a time when he pushed his canister past it's limit, he was at > 70 feet and could feel the hypercapnia coming on, instead of aborting and > using his oc bail out he decided to work it out and swim back to the boat. > I was thinking this was foolish, but now i see how one could slow everyting > down and get some more time. he did admit to having a headache for a day > afterward. i also see an advantage to a semiclosed system in that a > portion of the co2 is exhausted regularly. > > more to come. > > dp > -- This is good stuff. Hypercapnia has a different effect at depth, I think... Being aware of the effects of hypercapnia or scrubber failure is necessary, and I am sur will be covered in detail in any breather training. A far more insidious problem, and one which can not be monitored reliably (despite rich's experiences) by the body is oxygen control. Compared to oxygen, hypercapnia is about as threatening as baby's breath. Rod Nairne.
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