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>> To: techdiver@terra.net >> From: chris@ab*.co* (Christopher M. Parrett) >> Subject: Re: Gas Blending >> >> There is no doubt in my mind that we WILL run into limitations. >> What my goal is, is to allow the user to choose from an inventory of >> cylinders (we have about 100 now). >> This inventory has all of the data we need for the math. >> He then specifies, Dry fill or wet, if wet chilled or ambient. >> What the final fill pressure is. >> What the final Gas percentages are. >> >> We then give him a fill sequence, by time and by pressure. >> Assuming he is able to follow it, we "Should" be able to get fairly close to >> what he wants. >> Perfect, probably not, close, probably so. >> And importantly, this type of math will accomodate high pressure fills to >> 300bar+, where PP blending really begins to fall apart. > >Chris, > >Aren't you forgetting something REALLY important? What about minute >differences in tank volume. I realize it might seem trivial, however >under extreme pressures these minute differences can add up. > >If I tumble my 104's, and they were tumbled three times before I got >them, they'd be just a little bit bigger on the inside, and a little >bit lighter due to loss of metal. > >At a pressure of 2400psi (how many 104's still have that "+" on them, >eh? And how many of us would ever do anything like overfill 104's?) >that little difference caused by tumbling them four times could >really add up to big numbers and throw the whole formula off. > >Maybe if we had a customizable entry for number of times a tank has >been tumbled, then use an aggregate difference in internal volume >based on the average volume difference after tumbling, and the >weight differential of the tank after <x> amount of metal has >been lost in the tumbling proccess, then we could plug that into the >whole formula and resolve the entire problem to get an accurate >fill? ;-) > >Naw, I think I'll stick with partial pressure for my lowly EANx >fills. > >Ken >-- >-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >Ken Sallot "High ppO2's can be hazardous to your health" >CIRCA - Ronnie Bell >(904) 392-2007 >kens@uf*.ed* >http://grove.ufl.edu/~ken >-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > The minutia could creep up on us. But, you will be able to directly enter the actual volume of the cylinders. So, if you have some good idea how much the volume was actually altered during a hydro, go ahead and make the correction. But I would be Very surpirsed if it is of any real consequece at all. 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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