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Nitrox 21, hmmm that sounds familiar... Oh yeah, it's called AIR. First off, why are you using such a low "mix" for your second dive. If it is because it is too deep for higher percentages of O2 then you should be doing another trimix dive. Otherwise bump up the amount of O2 in the second dive. This will lower the overall N2 loading for the two dives considerably. Regards, Don -----Original Message----- From: Taylor, John [mailto:john.taylor@cs*.co*.uk*] Sent: Monday, December 27, 1999 10:16 PM To: 'techdiver@aquanaut.com' Subject: Deco question Dear list, Lets say I do a trimix dive followed by a nitrox dive. I'll use 14/50 for my trimix dive, and some time later, I'll use Nitrox 21 for my second dive. My tissues ongas Helium and Nitrogen during the trimix dive. During the deco for this dive, the helium loading disappears quickly, so, effectively, the limiting factor for final exit from the water becomes the nitrogen loading. Using Buhlmann ZHL-16B, it appears that the oxygen fraction in the mix is largely irrelevant (bear with me at this point!). In most implementations I have seen, the Fo2 is only used to determine which deco gas to use (i.e. the one which, if used, would not cause the selected Max PPo2 to be exceeded). Also, the implementations I have seen simply add the He and N2 loadings together. Would the residual N2 tissue loading be the same after my mix dive as if I'd dived the same profile on Eanx 64? Could I consider the (equivalent) N2 gas loading only when planning my second (nitrox) dive? JT -- John Taylor CREDIT | FIRST SUISSE | BOSTON Equity Derivatives and Convertibles Unit * +852 2101 6927 (Office) * +852 2101 7698 (Fax) * +852 9031 6395 (Mobile) * mailto:john.taylor@cs*.co*.uk* * mailto:live4diving@ho*.co* This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. CREDIT SUISSE GROUP, CREDIT SUISSE FIRST BOSTON, and each of their subsidiaries each reserve the right to monitor all e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised to state them to be the views of any such entity. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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