Poll

How do most people carb their kegs?

add ~3/8 cup corn sugar
0 (0%)
add ~3/4 cup corn sugar
2 (13.3%)
force carb for a couple days at 20-30psi
4 (26.7%)
force carb for 4-5 days at ~12psi
9 (60%)

Total Members Voted: 15

Voting closed: April 21, 2012, 01:14:48 PM

Author Topic: 3/8 cup vs. 3/4 cup for kegging?  (Read 3045 times)

Offline ukolowiczd

  • Assistant Brewer
  • ***
  • Posts: 144
  • Burlington, VT
    • View Profile
3/8 cup vs. 3/4 cup for kegging?
« on: April 07, 2012, 09:28:44 AM »
Can anyone explain why the rule of thumb for adding corn sugar in kegging is 1/2 of the norm (i.e. 3/8 cup vs. 3/4 cup)? I've just been adding the 3/4 cup in my kegs and am carbing fine. I'm worried that the 3/8 cup would be too little and I'd end up having to force carb a bit.

Offline mtnrockhopper

  • I spend way too much time on the AHA forum
  • ********
  • Posts: 2902
  • Delaware
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #1 on: April 07, 2012, 10:27:03 AM »
The fermented beer will have some dissolved co2 in it, and maybe some of it is forced out of solution during bottling. A bottling wand is a pretty right constriction. Perhaps combined with a preference for kegged beer to have lower carbonation?
Jimmy K

Delmarva United Homebrewers - President by inverse coup when the old president ousted himself.
AHA Member since 2006
BJCP: B0958

Offline a10t2

  • Official Poobah of No Life.
  • *
  • Posts: 3174
  • Ask me why I don't like Chico!
    • View Profile
    • SeanTerrill.com
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #2 on: April 07, 2012, 12:18:36 PM »
As far as I know there's no reason to use less. I suspect that people who are making that recommendation are finishing the beer off by force carbonating.
Beer is like porn. You can buy it, but it's more fun to make your own.
http://seanterrill.com/category/brewing/

Offline ukolowiczd

  • Assistant Brewer
  • ***
  • Posts: 144
  • Burlington, VT
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging? take the poll!
« Reply #3 on: April 07, 2012, 01:15:51 PM »
I added a poll about how people mainly carb their kegs.

Offline a10t2

  • Official Poobah of No Life.
  • *
  • Posts: 3174
  • Ask me why I don't like Chico!
    • View Profile
    • SeanTerrill.com
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #4 on: April 07, 2012, 01:24:15 PM »
Serving pressure and shaking. No need to wait.
Beer is like porn. You can buy it, but it's more fun to make your own.
http://seanterrill.com/category/brewing/

Offline tygo

  • I spend way too much time on the AHA forum
  • ********
  • Posts: 2622
  • Sterling, VA
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #5 on: April 07, 2012, 01:47:07 PM »
Set at serving pressure and forget.  Unless I'm in a hurry then I'll set it at serving pressure and shake.
« Last Edit: April 07, 2012, 01:59:04 PM by tygo »
Clint
Wort Hogs

Fermenting: Wit
On Tap: Lucifer's Hammer Golden Strong Ale, Dopplebock, Old Fuzzynut's Ale

Offline ukolowiczd

  • Assistant Brewer
  • ***
  • Posts: 144
  • Burlington, VT
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #6 on: April 07, 2012, 01:55:47 PM »
Serving pressure and shaking. No need to wait.
You mean you set it around 12psi and then shake it? For 20 minutes or so?

Offline ukolowiczd

  • Assistant Brewer
  • ***
  • Posts: 144
  • Burlington, VT
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #7 on: April 07, 2012, 01:56:35 PM »
Set at serving temp and forget.  Unless I'm in a hurry then I'll set it at serving temp and shake.

Do you mean set at serving psi? Serving temp? I don't understand.

Offline tygo

  • I spend way too much time on the AHA forum
  • ********
  • Posts: 2622
  • Sterling, VA
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #8 on: April 07, 2012, 01:58:46 PM »
Set at serving temp and forget.  Unless I'm in a hurry then I'll set it at serving temp and shake.

Do you mean set at serving psi? Serving temp? I don't understand.

Yeah, that's a typo.  Fixed.
Clint
Wort Hogs

Fermenting: Wit
On Tap: Lucifer's Hammer Golden Strong Ale, Dopplebock, Old Fuzzynut's Ale

Offline euge

  • I must live here
  • **********
  • Posts: 7247
  • Estilo Casero
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #9 on: April 07, 2012, 02:16:27 PM »
You shouldn't measure but weigh your priming sugar. If you use 3-4 oz per 5 gallons it should prime up perfectly for normal volumes such as 2.2-2.5 depending.

Sometimes I prime my kegs with sugar and push with the tank.

The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Offline ukolowiczd

  • Assistant Brewer
  • ***
  • Posts: 144
  • Burlington, VT
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #10 on: April 07, 2012, 04:21:07 PM »
You shouldn't measure but weigh your priming sugar. If you use 3-4 oz per 5 gallons it should prime up perfectly for normal volumes such as 2.2-2.5 depending.

Sometimes I prime my kegs with sugar and push with the tank.

I do weigh my priming sugar. I was just using the 3/8 and 3/4 as points of reference so as to not confuse and get specific with oz.'s of sugar.

Offline a10t2

  • Official Poobah of No Life.
  • *
  • Posts: 3174
  • Ask me why I don't like Chico!
    • View Profile
    • SeanTerrill.com
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #11 on: April 07, 2012, 04:34:31 PM »
You mean you set it around 12psi and then shake it? For 20 minutes or so?

More like shake it for a few seconds at a time, every few minutes, for a few hours. The exact pressure depends on the temperature and carbonation level.
Beer is like porn. You can buy it, but it's more fun to make your own.
http://seanterrill.com/category/brewing/

Offline euge

  • I must live here
  • **********
  • Posts: 7247
  • Estilo Casero
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #12 on: April 07, 2012, 04:35:47 PM »
You shouldn't measure but weigh your priming sugar. If you use 3-4 oz per 5 gallons it should prime up perfectly for normal volumes such as 2.2-2.5 depending.

Sometimes I prime my kegs with sugar and push with the tank.

I do weigh my priming sugar. I was just using the 3/8 and 3/4 as points of reference so as to not confuse and get specific with oz.'s of sugar.

And ended up being more confusing. ;)
The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman

Online morticaixavier

  • Official Poobah of No Life.
  • *
  • Posts: 5700
  • Davis, CA
    • View Profile
    • The Best Artist in the WORLD!!!!!
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #13 on: April 07, 2012, 07:50:24 PM »
I have not primed a keg yet, generally I go with Sean T's method of set to serving and shake. However I always assumed that the reduced amount of priming sugar had to do with the reduced headspace per ounce. The volume of headspace in a 12 oz bottle divided by 12 is greater than that in a keg divided by... 640? But that's just an assumption I came up with to justify what Charlie P says in the book.
"Creativity is the residue of wasted time" - A. Einstein

Jonathan I Fuller

Offline pyrite

  • Brewer
  • ****
  • Posts: 443
  • Davis, CA
    • View Profile
Re: 3/8 cup vs. 3/4 cup for kegging?
« Reply #14 on: April 07, 2012, 09:22:06 PM »
I set the CO2 regulator to 60psi and force carbonate at 33F for 2 days.
If you don't get in over your head, how are you ever going to know how tall you are.