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>From: IN%"101335.2300@co*.co*" "Lawrence Orchard" 16-JAN-1996 13:43:56.80 >To: IN%"techdiver@terra.net" "Techdiver" >CC: >Subj: 40% O2 rule for SCUBA <snip> >So where does the 40% rule originate and what is the justification for it?, as >opposed to 23% which we understand to be the standard adopted by most industries >in general in the UK. Hi: From my understanding, the origin of the 40% rule rests with the primary organization for compressed gas in the US which is the Compressed Gas Association. The CGA recomends and then other agencies adopt. In the US it has been adopted by virtually all Federal agencies including DOT, NAVY, NOAA plus other standard makers such as the NFPA etc. etc. Last year, the European standards committee adopted a standard for a nitrox valve to be used. I've had two manufactureres already tell me in 3rd quarter of "95" that they had a nitrox valve ready to go based on that adoption by the European market. I would imagine, that even though the US tends not to enforce certain standards as rigorously as they are in Europe, that we should see something similar adopted by 1997. If you want to get technical, based on DOT and CGA regulations the only thing legal in the US to put through a yoke valve is air..period. I've had several people who I've told this to take great exception to it but having become fairly familar with the ramifcations of failing to follow standards while on a fire department, the simple fact remains that once a standard such as a Nitrox valve is adopted, failing to use it leaves you wide open in case of accidents. For that reason, I would expect it to become the norm rather quickly. Also, in case anyone is interested, I've been told that the Nitrox valve will be a male thread coming out of the cylinder! Best Rick
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