HBT 2014 Big Giveaway - 94 Chances to Win!

Huge Supporting Membership Discounts!
 Home Brew Forums > Counter pressure filler question

11-02-2009, 10:11 PM   #1
kanzimonson
Feedback Score: 0 reviews
Recipes

Join Date: Aug 2009
Location: Charlottesville, VA
Posts: 1,925
Liked 25 Times on 22 Posts

 Counter pressure filler question

For those of you who use the BierMuncher beergun (and any counter-pressure filler for that matter) is there not a concern about loss of carbonation in those few seconds between removing the cane from the beer and capping it? Even if you cap on foam, I feel like you're creating a small airspace at the top of the bottle. Won't the beer equalize pressure with this airspace? Or is it so small it doesn't matter?

__________________

11-03-2009, 02:05 AM   #2
shortyjacobs
Feedback Score: 0 reviews
Recipes

Join Date: Aug 2009
Location: Twin Cities, MN
Posts: 2,511
Liked 28 Times on 28 Posts
Likes Given: 3

Normal carbonation is around 2 volumes, right? (give or take). In a 22 oz bottle, that's 44 oz of CO2, (at STP, but stop splitting my hairs ). The equalization with 1 or 2 ounces of headspace is minimal.

Edit, in a 12 oz bottle, it's 24 oz CO2...assuming 1 oz headspace, that's 4% unfilled....assuming your beer equalizes with the headspace, you lose, what, at most 8%? (I'm going off of me carbonating beer at around 12 psi, which is about 0.8 atm, and since PV=nRT, PV is inversely proportional, so pressure doubles, volume halves, half the volume means you fit twice as much, so at a rough estimate double the % unfilled).

You really wanna be safe, I guess overcarb your beer by 4-8%?

__________________

Last edited by shortyjacobs; 11-03-2009 at 02:09 AM.

11-03-2009, 02:08 AM   #3
Suthrncomfrt1884
Feedback Score: 0 reviews
Recipes

Join Date: Jun 2009
Location: Rockford, Illinois
Posts: 4,079
Liked 23 Times on 22 Posts
Likes Given: 3

BM's CPBF works just fine. That's why so many people have done it. I do mine a little bit differently because I too was worried about a loss in carbonation. Google "Poor Man's Counter Pressure Bottle Filler" if you want to see it.

You do need to cap fast. It's not like you can set aside six bottles and cap them after you've filled all six. You need to do them one at a time. There is a cushion of CO2 on top of the beer. If you get the cap on fast, you won't lose much CO2. I've had some of my bottles in the fridge for 6-8 months before I finally got around to drinking them and they still had great carbonation.

__________________
He who drinks beer sleeps well. He who sleeps well cannot sin. He who does not sin goes to heaven.

Another HERMS rig...