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Why do you need the expensive Haskel. Why can't you cascade your O2 then top the rest off with heliair out of your compressor (setup a flowmeter at the compressor intake then analyze output & adjust flow of helium until you get desired mix, send it to the tanks to get final mix) you should be able to use every bit of the helium without needing a haskel and its simple. Besides you need the compressor anyway so why buy two expensive items that basicly do the same thing. We take delivery of our Rix soon and that is what we plan to start working with right away unless somebody comes up with a real danger to doing this - if nobody else has tried this then I guess we will be the test dummys :-) Fill whips, Rix SA3, haskel & lots of fittings - $8000 +/- vs. Fill whips & Rix SA3 & a few fittings - $2500 +/- The decision was easy. (We can get several more Rix units with this kind of pricing if anybody is interested) At 07:27 PM 11/18/97 -0500, G. Irvine wrote: >Dennis, I guess you guys need Haskel pumps for sure. What we do that may >be of use to you is to mix the back tanks rich in helium, low in oxygen, >and use stages for the dive. In cave we do not actually use the back >tanks, and if helium costs that much, I would not use them otherwise >anywhere unless I had a Haskel pump. - G > > > >Dennis JR Harding wrote: >> >> George, >> Hell I envy you paying US$55 for 290 cubic feet. On average we pay double that. >> >> As far as the segregation of cylinders go, in South Africa there is a fairly strict colour code >> by which all suppliers adhere. >> >> Oxygen is supplied in black cylinders. Inductrial grade (non vacummed) is all black. >> Aviators, is black with the words "High Flying Oxygen" blodly appearing the full length of >> the cylinder. Medical oxygen, is black with a white neck. The difference between the last >> two is that Medical is dryer (less moisture) than the Aviators. >> >> Helium is supplied in a brown cylinder. Primarily the supplier would simply place a sticker >> on the cylinder. There is alos a size difference. Industrial grade is in a smaller cylinder. >> One supplier does however have a white neck on there medical grade. This is also accompanied >> with a spectrographic analysis. >> >> I know that one of the suppliers here, AFROX, also known as BOC will provide premix to your specification >> at a minimal cost above that of the gas. They are however the most expensive as far as the supply of Helium >> is concerned. Here we pay around US$250 for 300 cubic feet. >> >> Dennis. >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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