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> George, IANTD teaches the use of 1.4, 1.5, 1.6 bar PPO2in various circumstances - 1)from the IANTD Tech Nitrox manual, table of partial pressure limits, " 1.4 to 1.5 bar maximum for technical use" 2) from the summary chapter on oxygen use and misuse" in the Trimix manual, ".....in technical diving the PO2 (I guess they mean PPO2) cannot exceed 1.5 ata and the recommended is 1.4 ata". 3)The IANTD advanced manual gives 1.4 as the "with work" limit, 1.5 as the "recommended" limit and 1.6 as the max "no stop limit". 4)The IANTD Advanced nitrox slide set gives 1.6 bar as the PPO2 used for calculating the MOD of a mix. 5)The advanced deep air manual allows that 1.4 to 1.5 is the maximum for technical use, with 1.6 as the maximum limit for _non - technical_ diving and for decompression on techical dives. 6)However, the light at the end of the tunnel lies in the UK IANTD trimix slide set, which I have for review, which recommends 1.4 bar for the working phase of the dive, with 1.6 for deco. There, that all seems pretty straight forward now, doesn't it?????? (to be honest, we do what you do, but don't let on) safe diving. Martin In your message dated Sunday 10, September 1995 you wrote : > Bernie, could you explain the 1.5 max, 1.4 working PPO2? > This seems a little ambiguous. For example, I use 1.4 working > maximum for everything (nitrox or trimix) in conjuction with 130 > aed maximum for both nitrox and trimix. At deco, however, I go to > 1.6 ppo2 maximum (usually applies only to the beginning of > a gas switch and the twenty foot oxygen stop. > What I am asking is, which is it 1.5 or 1.4? I am sure > most of you already understand the relationship between > exposure levels and time, so I won't go into that. I would > also like to ask why this is not set at or below known > levels used in commercial and military diving when this > organization is teaching this to recreational divers. What > is wrong with this picture? > Bernie, I am not "directing" this "at" you, but you seem > to know somethning about it and could help us out here. > This is an imprtant issue, and needs serious treatment. > - George > > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. > -- --------------------------------------------------------------------------- | Martin Smith deep blue diving ltd EMail martin@de*.de*.co*.uk* voice 01344 421545 fax 01344 862231 | | Mail sent via Demon Internet - | ---------------------------------------------------------------------------
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