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On Tue, 14 Mar 1995, Frederic Badier wrote: > Currently thinking of developing a semiclosed apparatus, I am looking for > some guidelines/recommendations about scrubber materials preparation. I > know that the scrubber material should be compacted at the maximum to > avoid any "channeling effect" but is there a standard procedure ? Any > other aspect to consider? When I pack sofnolime (812 Grade D -- small grain size), I don't try to compress it, but I spend a great deal of time tapping the canister on the floor to help the material settle. The first time I seal the canister, I bang it around for a few minutes then open it up again to find that it has settled even more. I top-it off, tap it some more, then seal it up for good. No problems with channeling (I'm getting about 2-3 more hours than the stuff is rated for). > Is there a mean to evaluate the scrubber efficiency other than starting a > breathlessness. How to monitor the autonomy? Any idea if a scrubber pack > with an autonomy of 6 hours can be reused safely after a dive of 2-3 hours > or is it necessary to replace it systematicly? I notice a slight "stale" taste to the gas about 2 hours before the scrubber is used up. The next symptom is slight breathlessness only after heavy exertion. Slowly the "staleness" and "breathlessness" increase until I feel slightly breathless even at rest. Bear in mind...these symptoms only start to occur about 1-2 hours AFTER the rated life of the scrubber. I am pleased that there is a comfortable (1-2 hour) margin for error between first symptoms and end of scrubber life. As for re-using the scrubber, it depends on the dive. I try to make sure I have at least 1-2 hours of scrubber life beyond the planned duration of the dive, and I'm reluctant to do a serious decompression dive with anything besides fresh scrubber. Hope that helps... Aloha, Rich deepreef@bi*.bi*.ha*.or*
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