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From: ddrake01 George wrote: The Wakulla Project book had an example of differential He loss, if memory serves. It seems that someone had a slight manifold leak which allowed He but not the other gases to leak out. This produced a tri-mix which was lower in He and proportionally higher in O2 and N2. Very bad news when diving to 250+ ft for extended periods. Close call. <end insert> My understanding is that the helium is such a small and energetic gas that is will work through many materials, especially the rubber orings that are in manifolds and seal the tank valve to the neck of the tank. I was directed to purchase the Dive Rite/Divers Supply manifold because it has double orings in the cross over bar. This slows the loss of He. As others have said, mix just before you dive and analyze just before you dive. I don't have any info on how long it takes which manifold to lose what % of He over time/pressure, etc. I would look into new orings and possibly a new manifold if it stays a big issue. For those of you waiting for a fax, please stay with me. I didn't get in to work with the questionaire and will be out the rest of the week. Maybe next Monday. For those of you that can't send me messages, I'll try to call the internet man at my company and find out why I'm not getting them. Please keep trying. They seem to eventually get through on the upteenth try. David B. Drake ahdnn1a.ddrake01@ed*.co* Romulus, Michigan, USA EDS/GM Powertrain 8-375-5467 (GM NET)
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