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Dear All: I recently heard that ANDI advocates the mandatory use of an O2 clean reg if the tank contains 23.5% of O2 or more. I also heard that they go so far as to install only the DIN valves on O2 clean tanks; this way a diver wouldn't be able to use a non-O2-clean reg (yoke in this case) even when the gas contains less than 40% O2. Does anybody know if and why ANDI advocates these "rules" even if NOAA, NASA, OSHA, etc. say it is not necessary to use clean regs as long as there's 40% or less of O2 in the mix? Is this "DIN-only for nitrox tanks" rule enforced by all ANDI branches, or is it limited to some parts of the world (i.e., Australia and Japan)? Are there other agencies besides ANDI that do the same? Has there been any incident of cylinder explosion because a non-O2 clean reg was used on EAN40 or less? Exactly how did they (NOAA, OSHA, etc.) come up with this 40% rule? I know all of this sound absurd at best, but one guy in Australia insists it is a legitimate way to do nitrox and told me that I didn't know what I was talking about when I said it's unnecessary to limit nitrox to a particular type of valve. Thanks in advance for any relevant information, opinions, etc. Sincerely, Hidetaka Mizohata <mailto:hmizoha@hi*.co*> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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