Anyone ever hear of tank rolling after mixed gas fill??

[Rec Diver]

Originally posted by Randy43068: "You Nit-Wit".

Wow, from a quarry dive as well. All hail to those that dive only quarries.

 

[SDAnderson]

if it were true, but I doubt it's needed, handling the tank from the fill station to the entry point or dive site would mix the gas enough.

You're correct, but I'm not going to let you leave the shop until we have both made an accurate analysis of the mix. Hopefully, you aren't willing to do so, either. :11:

 

[WarmWaterDiver]

I can certainly see how non-ideal mixing can occur when 'batching' each gas blend component into a scuba tank - heck, I've seen industrial stuff on a larger scale with similar results in the oil & gas processing industry. But, once mixed, stays mixed.

A magnetic stirrer such as is used with lab scale equipment might be something for an entrepreneurial tech gas blender to come up with for use with aluminum tanks though. I'm not sure of the paramagnetic properties of the typical alloy chrome-moly steel used for steel scuba tanks to know whether this would work for the steel tanks, but my bet is 'no'. Hard to beat a lazy Susan for economics / practicality, and a bit of cardio exercise getting the tanks on & off the spinner.

However, whoever alleged nitrogen is heavier than oxygen needs to review high school chemistry - diatomic nitrogen (N2) has a molecular weight / mass of 28, while diatomic oxygen (O2) has a molecular weight / mass of 32 - 14% more than N2. But, Death Valley isn't significantly O2 enriched - just as it's not N2 enriched.

 

[liberato]

I started out as a pure Brownian dispersionist but after reading the anecdotes in this and the other thread from experienced and credible gas mixers and visualizing the viscousness of the gases under pressure I am a Mixologist convert. I did get a headache thinking about this and I now have an overwhelming urge to go pour a black and tan.

 

[SDAnderson]

I started out as a pure Brownian dispersionist but after reading the anecdotes in this and the other thread from experienced and credible gas mixers and visualizing the viscousness of the gases under pressure I am a Mixologist convert. I did get a headache thinking about this and I now have an overwhelming urge to go pour a black and tan.

 

[Randy43068]

Originally posted by Randy43068: "You Nit-Wit".

Wow, from a quarry dive as well. All hail to those that dive only quarries.

I was only kidding. I thought it obvious from the context and content of my post.

But I really don't think rolling a tank mixes the gas.

 

[Randy43068]

You're correct, but I'm not going to let you leave the shop until we have both made an accurate analysis of the mix. Hopefully, you aren't willing to do so, either. :11:

and I agree.

 

[Orlando Eric]

All I can say is that I subscribe to "Skeptic" and I am not willing to stare all that data, experience and actual results that I have seen with my own two eyes and not say well there must be something at work beyond my understanding of gasses and pressure.
I had a "really smart guy" explain it to me once and after dumbing it down several times came up with this.

Gases at that pressure although still gas and not liquid resemble the viscoscity of syrup more than air. The gas is actually "sticky" enough to roll around with the tank and mix instead of staying still while the tank rolls around it.

Believe me I was on the side of NO WAY that would work, to now I make sure I get fills the day before then analyze them.

Eric

 

[do it easy]

I did get a headache thinking about this and I now have an overwhelming urge to go pour a black and tan.

Just be sure to roll your black and tan on the floor before you drink it, otherwise, it might not mix properly.

 

[teknitroxdiver]

Just be sure to roll your black and tan on the floor before you drink it, otherwise, it might not mix properly.

And be SURE to analyze it before consumption....