Force Carb and Serving pressure question. - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Bottling/Kegging > Force Carb and Serving pressure question.

Reply
 
Thread Tools
Old 07-01-2007, 09:11 PM   #1
cpbergie
Recipes 
 
Jan 2007
San Diego
Posts: 212



I am force carbing my kegs at 40 degrees and about 12-18 PSIs (depending on the style). My kegerator seems to pour best at about 8-9 PSIs.

Is it ok to force carb for a week, and then dial down to the serving pressure, or am i going to run into some foam/pouring problems?

Whats actuallyhappeneing to my carb'ed keg. Isnt it slowly de-corbonating at the lower pressure?

 
Reply With Quote
Old 07-01-2007, 09:19 PM   #2
FlyingHorse
HBT_LIFETIMESUPPORTER.png
 
FlyingHorse's Avatar
Recipes 
 
Mar 2007
Evanston IL
Posts: 1,856
Liked 13 Times on 11 Posts


Quote:
Originally Posted by cpbergie
I am force carbing my kegs at 40 degrees and about 12-18 PSIs (depending on the style). My kegerator seems to pour best at about 8-9 PSIs.

Is it ok to force carb for a week, and then dial down to the serving pressure, or am i going to run into some foam/pouring problems?
Yes, it's fine. You'll want to bleed the higher pressure before you start pouring.

Quote:
Whats actuallyhappeneing to my carb'ed keg. Isnt it slowly de-corbonating at the lower pressure?
Exactly.
__________________
No signature required.

 
Reply With Quote
Old 07-01-2007, 09:39 PM   #3
kvh
Recipes 
 
Sep 2005
Baltimore, MD
Posts: 342

Quote:
Whats actually happeneing to my carb'ed keg. Isnt it slowly de-corbonating at the lower pressure?

-'Exactly'
Does this still happen if there's a check-valve installed on the gas line?
__________________
Make beer, not bombs.
(...and not bottle bombs either.)
Primary Fermentor - *empty*
Primary Fermentor -

Secondary - Mystery IPA
Secondary -
Bottle Conditioning -
Keg Conditioning -

Draft: - Apfelwein, Belgian-style Dubbel w/ Grains of Paradise
Bottles:(and still in stock): FIRST AG - (I)IPA 4.1.07, PK's Warm Spring Marzen, Summer Cerveza -BANG, PK's Winter Spice II, Espresso Stout, Indiana Pale Ale, PK's Chocolate Bitter II, Porterfield Porter, and New Year's 2006 remnants.


 
Reply With Quote
Old 07-01-2007, 09:40 PM   #4
EdWort
HBT_LIFETIMESUPPORTER.png
 
EdWort's Avatar
Recipes 
 
Jul 2006
Bee Cave, Texas
Posts: 11,912
Liked 342 Times on 169 Posts


I carb & dispense at 12 PSI. Works for me just fine.

 
Reply With Quote
Old 07-02-2007, 02:30 AM   #5
Sea
Green Flash IPA on tap
HBT_LIFETIMESUPPORTER.png
 
Sea's Avatar
Recipes 
 
May 2007
Southern Oregon
Posts: 1,478
Liked 6 Times on 6 Posts


The trick with force carbonation is that you want your beer to come out of the end of the dispensing tube @ 0 psi. Sounds odd right? What this means is that you need the pressure drop in the dispensing tube to equal the pressure that your regulator is set at. 3/16" I.D. tubing has a pressure drop of 2.2-3 PSI per foot. This means that to deliver beer at 12 psi (the pressure that I carbonate and dispense at), you need four to 6 feet of tubing. If you use 1/4" tubing which has a much lower pressure drop due to its larger size, you may need much more tubing. I've found that I use a little more to get the desired results (8-10' 3/16" ID), so you may need to experiment with length a little. Check this article, it is very comprehensive and does a much better job of explaining than I can:

http://www.northernbrewer.com/docs/pdf/corny-keg.pdf

It's vino tonight, but work comes early.
__________________
I plan on living forever. So far, so good! - unknown.


Corrupt Brewers

 
Reply With Quote
Old 07-02-2007, 02:46 AM   #6
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 23,330
Liked 1765 Times on 1122 Posts


What sea said. Add more line length and make sure it's 3/16" ID.
__________________
Welcome to BrewHardware.com. I love you.
New Stirplates are IN!
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

 
Reply With Quote
Old 07-02-2007, 02:52 AM   #7
FlyingHorse
HBT_LIFETIMESUPPORTER.png
 
FlyingHorse's Avatar
Recipes 
 
Mar 2007
Evanston IL
Posts: 1,856
Liked 13 Times on 11 Posts


Quote:
Originally Posted by kvh
Does this still happen if there's a check-valve installed on the gas line?
Yes. If you're beer is force carbed at 18 psi, as soon as you drop the serving pressure to 12 psi, the CO2 in the beer will start to come out of solution to equalize the pressure. I'm not sure how long it takes, but eventually your beer will be carbed at whatever serving pressure you're using.

As others have said, if you want a higher level of carbonation (and thus a higher serving pressure), you need a longer beer line. This site can help you calculate what you'll need.
__________________
No signature required.

 
Reply With Quote
Old 07-02-2007, 04:15 AM   #8
cpbergie
Recipes 
 
Jan 2007
San Diego
Posts: 212


Thanks, i used those calculations, and it turns out i need more line. im not able to tackle that yet, so this is my temporary solution.

But this brings up and interesting point, because one of my kegs will be from a brewery, what are the odds that my kegerator is setup to the same pressure that they cabonated at? probably not very high. How do bars handle this?

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Drop in Tank pressure with force carb broadbill Bottling/Kegging 5 10-09-2009 06:08 PM
Force Carb Question Kronin Bottling/Kegging 2 10-04-2009 11:56 PM
Force Carb question fuzzybee Bottling/Kegging 8 08-24-2009 02:18 AM
question about force carb. miatawnt2b Bottling/Kegging 7 09-20-2007 11:38 PM
Force Carb Question(s) jezter6 Bottling/Kegging 8 08-15-2007 04:25 PM


Forum Jump