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I am so fed up with the problems of getting a mix fill round here (NW England) that I'm going to have to do it myself. Helium cylinders here (from British Oxygen anyway) only have a 137 bar (2000 psi) fill pressure, so even cascaded, you're going to loose a lot. My question is this: Is there any reason why the outlet from a helium cylinder (appropriately regulated, restricted etc. to approx 1 bar of course) shouldn't be directly fed into a compressor inlet to be compressed into the scuba cylinders just like air? That way you could drain the helium cylinder practically dry with little more than standard gear. I'm not talking about a lash-up here, proper regulator, hoses, inlet gauge, seals etc. for safety & to ensure no air inadvertently gets sucked in. I'm guessing that some sort of 1 bar reservoir is going to be needed to smooth out the compressor's first stage inlet pressure variations, but I can't see too many other major problems (apart from - if it such a good idea, why doesn't everybody do it) This should be a simple yes or no question and I'm not really interested in anyone's "opinion" about it, so if you don't know what you're talking about, please don't bother to reply. But if you do, and especially if you know of commercially available gear or published information, I'd appreciate it. Regards --------------------------------------------------------------------------- | Paul Chapman EMail paul@de*.de*.co*.uk* | ---------------------------------------------------------------------------
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