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>I disagree. In addition to the gas addition system, you have a scrubber, >bag, and non-return valves to consider also. In the spirit of disclosure, >I'll say that _all_ of the failures I have seen (one exception)with those >components were due to operator error (assembly), or worn equipment (ie, >dry-rotted bags) that should have been caught during pre-dive checks (again, >operator error). But, we can say the same about most equipment, can't we? Yup. Which is why we suck-test the rig before diving it. Mine will hold a vacuum for about an hour. Nothing to it. >(The one exception was, I recall, an indeterminate case of CO2 >intoxication - the canister seemed OK, and the diver wasn't really >overexerting himself. We never did figure out what happened). Hmmmmmm. >Failures of only the gas addition system _seemed_ to happen as rarely as >similarly maintained OC gear Which means zero failures in service, huh?? ;-) > >As for nitrogen off-gassing, decreasing the FO2 during deco, I'd be >interested if someone out there who is math-smart (rules _me_ out) could >approximate its effect. Is the amount of dissolved N2 in the body so >insignificant, when back in gas phase, as to not really change the FO2 that >much? Or is it so little that a user should just re-purge every five minutes >or so? Does anyone know the _rate_ of elimination, in units that are not >simply time expressions? This would be very interesting to me as well. Anybody game to make the calculations? This might just be interesting from an OC viewpoint also. -how much- nitrogen expressed in CC's at 1 ATMA are offgassed after a typical deco dive? Dave Sutton -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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