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At 18:44 09/12/97 +1100, you wrote: "...PADI's standards are designed to teach no decompression diving to a maximum of 40m, preferably 30m. This is the stated aim, and they do this quite well." "PADI's attitude as far as I've always experienced (as a diver and instructor) has been that depths beyond 40m, decompression diving and penetration beyond the natural light zone (technical diving?) are outside the scope of what they teach. They also say that if someone wants to venture outside these limits, tehy need to gain appropriate training, and will refer appropriately" "...And I hope if PADI do embrace deco diving, they maintain a depth >limit of no more than 50m for nitrox based gases. I would like you to explain me a few things: 1) How can you give limits for depht (30 to 40m) for dives on air, and another limit for nitrox based gases (50m)? Are you saying that when using nitrox you can dive deeper than using air? 2) what nitrox based gases do you use for dives at 50m? According to my calculation that would give an EANx23 (ppO2=1,38 bar at 50 m), and for that depht, using the Buehlmann tables there is no possibility for no decompression dives at 50m. 3) Does the work envolved on mixing oxygen and air to blend an EANx23 justifies the "safety margin"? Thanks in advance Pedro Neves -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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