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--------------6C42F16DC0D74CF837D54FE9 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Just to go over the arithmetic of the "optimal" mix: Depth 149 fsw pressure at depth 5.515151515 ATA ppO2 1.3 (based on cold and current) Desired END 132 fsw ppO2 + ppN2 5 ATA (assuming that O2 and N2 are equally narcotic) ppN2 3.7 ATA ppHe 0.515151515 ATA FO2 23.6% FHe 9.3% FN2 67.1% Rounding off, use: FO2 23.0% FHe 10.0% FN2 67.0% I have no actual opinion on whether you should dive this mix, this is just an arithmetic exercise. If you want the formulae, then you could either visit Jim Cobb's Trimix site, or check out Tom Mount's book. References for either are on my site. -- Wrolf wrolf@wr*.ne* Wrolf's Wreck: http://wrolf.net Wrolf's Net.Wreck: http://wrolf.net/netmgmt.shtml --------------6C42F16DC0D74CF837D54FE9 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> Just to go over the arithmetic of the "optimal" mix: <p><tt>Depth &n bsp; 149 fsw</tt> <br><tt>pressure at depth 5.515151515 ATA</tt> <br><tt>ppO2 &n bsp; 1.3 (based on cold and current)</tt> <br><tt>Desired END 132 fsw</tt> <br><tt>ppO2 + ppN2 5 & nbsp; ATA (assuming that O2 and N2 are equally narcotic)</tt> <br><tt>ppN2 &n bsp; 3.7 ATA</tt> <br><tt>ppHe &n bsp; 0.515151515 ATA</tt><tt></tt> <p><tt>FO2 23.6%</tt> <br><tt>FHe 9.3%</tt> <br><tt>FN2 67.1%</tt><tt></tt> <p><tt>Rounding off, use:</tt><tt></tt> <p><tt>FO2 23.0%</tt> <br><tt>FHe 10.0%</tt> <br><tt>FN2 67.0%</tt> <p>I have no actual opinion on whether you should dive this mix, this is just an arithmetic exercise. <p>If you want the formulae, then you could either visit Jim Cobb's Trimix site, or check out Tom Mount's book. References for either are on my site. <br>-- <br>Wrolf &n bsp; wrolf@wr*.ne* <p>Wrolf's Wreck: <A HREF="http://wrolf.net">http://wrolf.net</A> <br>Wrolf's Net.Wreck: <A HREF="http://wrolf.net/netmgmt.shtml">http://wrolf.net/netmgmt.shtml</A> <br> </html> --------------6C42F16DC0D74CF837D54FE9-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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