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In message <960116160713_101335.2300_GHW103-1@Co*.CO*>, Lawrence Orchard <101335.2300@co*.co*> writes >Here in the UK we have heard the standard is being set that anything over 23% O2 >is to be classed as Oxygen for compressors, cylinders and regulators etc. False - Discussions have not got anywhere near that right now. We are attending another working party beggining of Feb > >This obviously has some big implications as there will be no question of using >your non O2 service regs for up to 40% nitrox mixs, you'll have to have seperate >dedicated regs. I also heard it rumoured that the HSE (Health & Safety >Executive) in the UK will be recommending proprietory cylinder valves, >compressor whips and 1st stage connections for anything over 23%. This will be >similar to a DIN fitting but will have some feature that means ordinary DIN wont >work with it. Again - No special conection interface is being proposed > >One of the benefits of such a system will be for the gas blender who can feel >more confident that the O2 clean cylinder he is about to fill has not had air >pumped from an oil based compressor and thus unlikely to get an O2 fire. Why - you can fit any connection to any compressor whip. > >The only reference that we've heard of OKing the 40% rule is from the US Navy >guidelines which use RIX type oil free compressors anyway. I trust when you say 'we' you mean you?. The rules regarding compatability and application are well documented (and distorted!) > >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. NOAA, US Navy and commercial standards provides the 40% stuff. The 23% rumour for the UK is another 'bullshit' rumour. I am curious where you have heard it from? -- Chris Hellas
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