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>Chris P., > You seem to be making a bigger deal out of mixing gas than it needs >to be. You can do all the research, crunching data, talk to all the >math whiz kids you want, when the mixing is being done by the average >or non-average diver you cannot count for differences in everyones >gauges, eye-balling the needle, filling at different rates, or even >the true contents in the average fill of O2 or He you get from the >local gas supplier. All the mixer really needs to know is the normal >gas laws we've used for years. They just need to make sure the O2% is >not more than they wanted, it will not make much differencon deco if >the O2% is 2% low, check a few tables. When I mix 14/45 for Wakulla I >need 1620 He and about 140 O2. I will overfill the He to 1700 or 1750 >cause I don't want to be narced, which causes the final O2% to be >between 13 and 13.5%, I also don't want to tox. I don't know how much >mixing you do, but I go through about 1500 cubic feet of He a month >alone. I'm sure all the other guys here on WKPP would tell you the >same thing. Try the Hogarth approch to gas mixing, KEEP IT SIMPLE. > > Barry > >-- > > Barry: I am doing about ZERO mixing, and that is my main problem. As there is NO blending going on in Colorado I am forced to ask for outside help. One of THE most requested tools in Abyss is a gas mixing system that does not rely on Partial pressure blending techniques. People are asking me to lay out a controlled proceedure to increase the likihood of being close to the mark on the first fill. As no one else has done this before, and I can't find it anywhere else myself, we decided to take it on a year ago. Much to my surprise it has been extremely difficult to get the math to reflect reality. With that in mind I decided to get as large a sample of real world mixes as I could to use as a baseline for compensation. If you don't have any personal reason to see this "not" happen, I sure could use your help in making it happen. If WKPP keeps records on the filling it is doing, or has specific proceedures that yeild very consistent results, I would be most interested in seeing them. Thanks Christopher M. Parrett, President, Abysmal Diving Inc. Makers of ABYSS, Advanced Dive Planning Software. 6595 Odell Place, Suite G. Boulder CO, 80301 Ph, 303-530-7248, Fx, 303-530-2808 ftp://abysmal.com/users/abysmal http://www.emi.net/gulfstream/abyss/abyss.html
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