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Harry, CGA standards say you should either wait 8 hours or tumble for 1 hour to acheive a homogeneous mix. I get a good giggle everytime I see someone kicking about a tank on the floor. Even though the standards say tumble for 1 hour, most do not think its necessary at all. But, for what its worth, thats the CGA standard. Also, since its from memory, those numbers may be off a bit, but its something like that. You could vortex mix the gases first, then fill the tanks. But that requires a real mixer. -WES ---------- From: haj@te*.ed* To: techdiver@terra.net Subject: O2 Spikes and Nitrox Date: Wednesday, December 20, 1995 11:05AM Errors-To: owner-techdiver@terra.net Precedence: bulk Errors-To: owner-techdiver@terra.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII I have seen several references to "O2 spikes" and Nitrox (a situation were a diver breaths a fraction of O2 greater than the sum of a given mix). Is this a real concern with Nitrox? I got my TDI Nitrox certification this year and have used Nitrox on about 50 dives since. I ALWAYS analyize my mix before EVERY dive, but if O2 does "seperate", the odds of an "O2 spike" are very real! I recently went into the local dive shop where I get my Nitrox fills and they were rolling tanks back-and-forth across the floor, "mixing the gas" after a fill. This concerned me because I get my tanks filled with EAN 32 & 36 and may not actually dive the tanks for 1 or 2 weeks. Will the gases "seperate"? Should I physically "mix" the gas (roll the tank around) before each dive? Will O2 stay in gasious solution? Thanks in Advance Harry Jones haj@te*.ed* Padi DM-91974 -- Send mail for the `techdiver' mailing list to `techdiver@terra.net'. Send subscription/archive requests to `techdiver-request@terra.net'.
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