Questions on beer gas (Nitrogen/CO2 mix) in a new keg

[doug293cz]

So the gauge on our keg in space would be off the upper end of the scale if " carbed " to 1 psi on earth and retested in space and the whole system would most likely fail in a big way.

Will have to go back to the physics A level books a darkened room and an alcohol free coffee.

No, the difference is only 14.7 psi sea level vs. outer space. But it does need to be accounted for when doing calculations.

Brew on

 

[Hwk-I-St8]

Wow, that's a lot of math....more than I want to do.

Aren't the carbonation charts based off of gauge pressures already?

 

[day_trippr]

If they are you can bet the charts/tables are set for sea level...

Cheers!

 

[doug293cz]

Wow, that's a lot of math....more than I want to do.

Aren't the carbonation charts based off of gauge pressures already?

Yes.

If they are you can bet the charts/tables are set for sea level...

Cheers!

And, yes.

The tables assume that the headspace gas is 100% CO2, and they have already done the adjustment for absolute vs. gauge pressure (but only for sea level.) The charts are useless as soon as you start talking about beer gas (mixed N2 and CO2.) It's not difficult to build a spreadsheet that does elevation correction, gauge vs. absolute correction, calculates partial pressures of both CO2 and N2, and spits out gauge pressure for beer gas at any N2/CO2 ratio.

Brew on