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--=====================_2683737==_.ALT Content-Type: text/plain; charset="us-ascii" At 01:04 AM 24/08/2001 , Gliviak, Jozef wrote: >Hello guys, > >Recently we had a disscussion with a few friends where some of them >advocated usage of N50 instead of O2 typically for dives like 55m/15min. My >opinion would be to choose O2 rather then N50. >Can you please answer me if there are a situations when it is more >appropriate to use just N50 instead of oxygen. Please add a few examples of >dives where would you choose O2 and where N50 as the only deco gas. Jozef - most of the wrecks aoound here are between 48 and 75 metres. A group of us have been diving these wrecks for years for bottom times between 18 and 25 minutes using bottom gas and 50. Early on we dived straight Buhlmann tables, then modified Buhlmann with deep stops, and now some are doing hand-shaped Buhlmann, and some, gradient factors. Over the years, we've increased the helium content in the bottom gas (and introduced it on the shallow wrecks) but the deco gas has remained the same - 50% - without incident. The only problems I've ever had have been last year on two successive dives trialling Gradient factor tables where I felt like shit after the dives, but that was probably the aggressive way I set the GFs not the gas. With a real slow ascent and a good soak at 21 metres, the 50 allows you to get most of your deco done by the time you get to the shallow stops. I've never noticed a detectable physiological difference adding 02 or substituting 02 for the 50%. rgds billyw >Best regards > >Jozef Gliviak >Slovakia > >----------------------------------- >The answer I received from George is too general for me to see where is the >effective border >Trey: >Depends on the bottom gas. Oxygen if the dive is shallow, 50% if it is >deeper . The idea is to get good deco at all the intermediate steps, >relieving the need for oxygen up high. Go by the bottom gas and the time. >Add gases as needed. >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. --=====================_2683737==_.ALT Content-Type: text/html; charset="us-ascii" <html> At 01:04 AM 24/08/2001 , Gliviak, Jozef wrote:<br> <blockquote type=cite cite>Hello guys,<br> <br> Recently we had a disscussion with a few friends where some of them<br> advocated usage of N50 instead of O2 typically for dives like 55m/15min. My<br> opinion would be to choose O2 rather then N50.<br> Can you please answer me if there are a situations when it is more<br> appropriate to use just N50 instead of oxygen. Please add a few examples of<br> dives where would you choose O2 and where N50 as the only deco gas.</blockquote><br> <br> Jozef - most of the wrecks aoound here are between 48 and 75 metres.<br> <br> A group of us have been diving these wrecks for years for bottom times<br> between 18 and 25 minutes using bottom gas and 50. Early on we dived<br> straight Buhlmann tables, then modified Buhlmann with deep stops, and now <br> some are doing hand-shaped Buhlmann, and some, gradient factors.<br> <br> Over the years, we've increased the helium content in the bottom gas (and<br> introduced it on the shallow wrecks) but the deco gas has remained the <br> same - 50% - without incident.<br> <br> The only problems I've ever had have been last year on two successive<br> dives trialling Gradient factor tables where I felt like shit after the <br> dives, but that was probably the aggressive way I set the GFs not the gas.<br> <br> With a real slow ascent and a good soak at 21 metres, the 50 allows you <br> to get most of your deco done by the time you get to the shallow stops.<br> <br> I've never noticed a detectable physiological difference adding 02 or <br> substituting 02 for the 50%. <br> <br> rgds billyw<br> <br> <br> <br> <blockquote type=cite cite>Best regards<br> <br> Jozef Gliviak<br> Slovakia<br> <br> -----------------------------------<br> The answer I received from George is too general for me to see where is the<br> effective border<br> Trey:<br> Depends on the bottom gas. Oxygen if the dive is shallow, 50% if it is<br> deeper . The idea is to get good deco at all the intermediate steps,<br> relieving the need for oxygen up high. Go by the bottom gas and the time.<br> Add gases as needed.<br> --<br> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.<br> Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.</blockquote></html> --=====================_2683737==_.ALT-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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