Gas separation

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I was reading the Smith Equipment catalog and they mentioned one of the benefits of a gas blender is that it prevents gas separation. Just wondering if a bottle of 75/25 would/could ever separate?"Where's Stick man????????" - 7A749"SHHHHHH!! I sent him over to snag that MIC-4 while tbone wasn't looking!" - duaneb55"I have bought a few of Tbone's things unlike Stick-Man who helps himself" - TozziWelding"Stick-man"
Reply:crap, ya fooled me.  i though this was about ethenol gas lolRealgear 140 MIGMore DeWalt tools that I prolly needDIY 160 amp 40 OCV MOT Stick Welder
Reply:Short answer = NOHow old was that advertising?Modern fill plants operate by weight, and use computers to open and close valves on the fill.  Chances of a mismix on 75/25 are almost nonexistant unless the operator overrides the computer.
Reply:Shake vigorously for one min after mixing ball begins to rattle and frequently during use....My name's not Jim....
Reply:I've never had an issue with gas seperation in all my years mixing dive gases using helium. You would think if you were going to have a problem, it would be with a gas like helium, thats so much lighter than other gases.The only issue I've ever encountered was stratification in newly mixed tanks using partial pressure methods when the fills were very slow. The mix will read wrong on the anilizer when 1st tested. However if you wait 2 of 3 days, or take the tanks for a drive and subject them to vibration, the mix will analize spot on, and will stay that way. I've double checked mixes almost 1 year later and still had them analize the same as when they were blended..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:The catalog was copyright 2004, not that old and I think still current. My friend has a bottle of 75/25 over ten years old and when I read this I just wondered if it could ever separate and have an effect on the welds."Where's Stick man????????" - 7A749"SHHHHHH!! I sent him over to snag that MIC-4 while tbone wasn't looking!" - duaneb55"I have bought a few of Tbone's things unlike Stick-Man who helps himself" - TozziWelding"Stick-man"
Reply:I believe thay tanks for mixed gas have some type of draw tube also in them.  This lets the gases be drawn from the whole length of the tank and not just from the top.
Reply:at standard temperature and pressure it was my understanding that it was IMPOSSIBLE for gas to seperate.  I thought it was one of the gas laws.  For the same reason, the atmosphere doesn't seperate with the heavier argon going to the ground and light helium popping off the top of the atmosphere.Gases will stay mixed,  I thought the only way to seperate them easily was to take them down so low that everything turns to a liquid then slowly raise the temperature and skim off the gases one by one? that's how they reclaim argon.
Reply:Originally Posted by Stick-manThe catalog was copyright 2004, not that old and I think still current. My friend has a bottle of 75/25 over ten years old and when I read this I just wondered if it could ever separate and have an effect on the welds.
Reply:Originally Posted by Metarinkaat standard temperature and pressure it was my understanding that it was IMPOSSIBLE for gas to seperate.  I thought it was one of the gas laws.  For the same reason, the atmosphere doesn't seperate with the heavier argon going to the ground and light helium popping off the top of the atmosphere.Gases will stay mixed,  I thought the only way to seperate them easily was to take them down so low that everything turns to a liquid then slowly raise the temperature and skim off the gases one by one? that's how they reclaim argon.
Reply:mulva?    Dolores!      Junior Mint anyone?  As said multiple times above, mixed gas stays mixed.  Mis-filled/mislabeld gases are just that, mis-filled/mislabeled.  Only other way for the gases to separate is via some process like partial liquification.  The best laid schemes ... Gang oft agley ...