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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. 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. 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. 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. 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. Constructive thoughts and comments will be welcomed. Regards Lawrence Orchard
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