Beer Gas Mix

Beer Gas Mix

Post by Steve E. Kiss » Thu, 21 Jun 2001 23:55:04



I was thinking about the CO2 N2 beer gas mixture and wonder if any rcb'ers
who use this could clarify something for me. When filling an (empty) tank
I assume the gas dealer first fills with CO2 to some weight. This leaves
the cylinder partly filled with liquified CO2 with the remaining volume
at around 600 psi. Then the N2 is added, raising the pressure to something
like 2000 psi. The clyinder will have liquified CO2 in the bottom with
some dissolved N2, and the remaining volume will have 600 psi partial pressure
of CO2 with the rest being N2. Since the partial pressure of CO2 will
remain near 600 psi during use while the partial pressure of N2 will only
decrease, doesn't the mixture ratio of the gas change quite a bit during
the use of the cylinder? It seems that the proportion of N2 should decrease
with use until 600 psi is reached at which point the gas is mostly CO2.
Can any users confirm this and perhaps explain the filling procedure?
 
 
 

Beer Gas Mix

Post by jpsto » Fri, 22 Jun 2001 08:05:38


Absolutely NOT...You do not use one tank for " gas mix ". You have to have
two separate tanks, one for each gas.
Then you need an " air blender " to blend the gases together at the desired
mix ... 70/30  60/40


Quote:
> I was thinking about the CO2 N2 beer gas mixture and wonder if any rcb'ers
> who use this could clarify something for me. When filling an (empty) tank
> I assume the gas dealer first fills with CO2 to some weight. This leaves
> the cylinder partly filled with liquified CO2 with the remaining volume
> at around 600 psi. Then the N2 is added, raising the pressure to something
> like 2000 psi. The clyinder will have liquified CO2 in the bottom with
> some dissolved N2, and the remaining volume will have 600 psi partial
pressure
> of CO2 with the rest being N2. Since the partial pressure of CO2 will
> remain near 600 psi during use while the partial pressure of N2 will only
> decrease, doesn't the mixture ratio of the gas change quite a bit during
> the use of the cylinder? It seems that the proportion of N2 should
decrease
> with use until 600 psi is reached at which point the gas is mostly CO2.
> Can any users confirm this and perhaps explain the filling procedure?


 
 
 

Beer Gas Mix

Post by Dan Listerman » Fri, 22 Jun 2001 09:06:48


The gas mix uses a tank with a dip tube that goes down to the liquid CO2
level.  I am not sure how it works beyond that.  I am sure that blending two
tanks is the best system, but I believe that this is not how it is usually
done.

--
 Dan Listermann

Check out our new E-tail site at http://www.listermann.com

Take a look at the anti-telemarketer forum.  It is my new hobby!



Quote:
> I was thinking about the CO2 N2 beer gas mixture and wonder if any rcb'ers
> who use this could clarify something for me. When filling an (empty) tank
> I assume the gas dealer first fills with CO2 to some weight. This leaves
> the cylinder partly filled with liquified CO2 with the remaining volume
> at around 600 psi. Then the N2 is added, raising the pressure to something
> like 2000 psi. The clyinder will have liquified CO2 in the bottom with
> some dissolved N2, and the remaining volume will have 600 psi partial
pressure
> of CO2 with the rest being N2. Since the partial pressure of CO2 will
> remain near 600 psi during use while the partial pressure of N2 will only
> decrease, doesn't the mixture ratio of the gas change quite a bit during
> the use of the cylinder? It seems that the proportion of N2 should
decrease
> with use until 600 psi is reached at which point the gas is mostly CO2.
> Can any users confirm this and perhaps explain the filling procedure?

 
 
 

Beer Gas Mix

Post by Walt Lewi » Fri, 22 Jun 2001 23:51:02


That's interesting. Several folks in my brew club -- myself inclided
-- regularly mix CO2 and Nitrogen in ONE tank and it seems to work
just fine for us. It also seems to work ffine fir every bar in town
serving guinness.

Just my experience, YMMV

Walt

Quote:

>Absolutely NOT...You do not use one tank for " gas mix ". You have to have
>two separate tanks, one for each gas.
>Then you need an " air blender " to blend the gases together at the desired
>mix ... 70/30  60/40


>> I was thinking about the CO2 N2 beer gas mixture and wonder if any rcb'ers
>> who use this could clarify something for me. When filling an (empty) tank
>> I assume the gas dealer first fills with CO2 to some weight. This leaves
>> the cylinder partly filled with liquified CO2 with the remaining volume
>> at around 600 psi. Then the N2 is added, raising the pressure to something
>> like 2000 psi. The clyinder will have liquified CO2 in the bottom with
>> some dissolved N2, and the remaining volume will have 600 psi partial
>pressure
>> of CO2 with the rest being N2. Since the partial pressure of CO2 will
>> remain near 600 psi during use while the partial pressure of N2 will only
>> decrease, doesn't the mixture ratio of the gas change quite a bit during
>> the use of the cylinder? It seems that the proportion of N2 should
>decrease
>> with use until 600 psi is reached at which point the gas is mostly CO2.
>> Can any users confirm this and perhaps explain the filling procedure?

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Beer Gas Mix

Post by jpsto » Sat, 23 Jun 2001 07:54:29


Here in Wichita Falls Texas
No supplier will combine into one tank

and All of our Bars use Blender or have to separate regulators by code

Differences might be regional

Quote:
> That's interesting. Several folks in my brew club -- myself inclided
> -- regularly mix CO2 and Nitrogen in ONE tank and it seems to work
> just fine for us. It also seems to work ffine fir every bar in town
> serving guinness.

> Just my experience, YMMV

> Walt

> >Absolutely NOT...You do not use one tank for " gas mix ". You have to
have
> >two separate tanks, one for each gas.
> >Then you need an " air blender " to blend the gases together at the
desired
> >mix ... 70/30  60/40


> >> I was thinking about the CO2 N2 beer gas mixture and wonder if any
rcb'ers
> >> who use this could clarify something for me. When filling an (empty)
tank
> >> I assume the gas dealer first fills with CO2 to some weight. This
leaves
> >> the cylinder partly filled with liquified CO2 with the remaining volume
> >> at around 600 psi. Then the N2 is added, raising the pressure to
something
> >> like 2000 psi. The clyinder will have liquified CO2 in the bottom with
> >> some dissolved N2, and the remaining volume will have 600 psi partial
> >pressure
> >> of CO2 with the rest being N2. Since the partial pressure of CO2 will
> >> remain near 600 psi during use while the partial pressure of N2 will
only
> >> decrease, doesn't the mixture ratio of the gas change quite a bit
during
> >> the use of the cylinder? It seems that the proportion of N2 should
> >decrease
> >> with use until 600 psi is reached at which point the gas is mostly CO2.
> >> Can any users confirm this and perhaps explain the filling procedure?

> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----==  Over 80,000 Newsgroups - 16 Different Servers! =-----

 
 
 

Beer Gas Mix

Post by Kel Rekut » Sun, 24 Jun 2001 23:11:27


Quote:

> I was thinking about the CO2 N2 beer gas mixture and wonder if any rcb'ers
> who use this could clarify something for me. When filling an (empty) tank
> I assume the gas dealer first fills with CO2 to some weight. This leaves
> the cylinder partly filled with liquified CO2 with the remaining volume
> at around 600 psi. Then the N2 is added, raising the pressure to something
> like 2000 psi. The clyinder will have liquified CO2 in the bottom with
> some dissolved N2, and the remaining volume will have 600 psi partial pressure
> of CO2 with the rest being N2. Since the partial pressure of CO2 will
> remain near 600 psi during use while the partial pressure of N2 will only
> decrease, doesn't the mixture ratio of the gas change quite a bit during
> the use of the cylinder? It seems that the proportion of N2 should decrease
> with use until 600 psi is reached at which point the gas is mostly CO2.
> Can any users confirm this and perhaps explain the filling procedure?

The normal procedure is to ask your compressed gas vendor to
sell you beer gas mix instead of CO2. Usually this requires
another canister as nitrogen and therefore nitro - CO2 mix
is held at higher pressure. The valves are different. Most
of the liquid carbonation vendors are pushing nitro mix to
the bars. They'd be happy to sell it to you as well.

Large volume users can justify gas blending systems
involving CO2 and N2 as well as air for cleaning and
purging. Some use the system to drive soda, beer and wine in
their taps. Each requires different gas blends. One system
will do it all.

I don't think you will like the $$ tag....

Cheers!

Kel