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Old 07-12-2013, 01:54 AM   #1
GUZ808
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Default Priming a partially filled keg

Hello I am trying to keg a batch of american amber with priming sugar.
My problem is I don't have a full 5 gallons of beer to prime.
So my problem, I have 4 gallons of beer and want to prime my 5 gallon keg with sugar. I know I will have some head space in the keg, so do I add more of less priming sugar because of that?

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Old 07-14-2013, 01:21 AM   #2
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Bump......Bump

Does anyone have a clue if I should add a little more priming sugar or less?
Or will using the same amount be fine?

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Old 07-14-2013, 01:27 AM   #3
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Quote:
Originally Posted by GUZ808
Bump......Bump

Does anyone have a clue if I should add a little more priming sugar or less?
Or will using the same amount be fine?
Fuc& it add more you can always bleed it off-
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Old 07-14-2013, 01:28 AM   #4
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Add a lil more since there is more air (headspace) that needs to be pressurized. How much, I don't think I can help ya there.

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Old 07-14-2013, 01:35 AM   #5
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Quote:
Originally Posted by kpr121
Add a lil more since there is more air (headspace) that needs to be pressurized. How much, I don't think I can help ya there.
Come in- the math is easy.

Crunching the numbers I came up with 4.54572158oz and if it seems over carbonated than bleed off the extra gassssss
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Old 07-14-2013, 01:38 AM   #6
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You definitely need to purge the O2 out of the keg. And you're going to need to fill the keg with some pressure to seal it (20+psi). I don't know how much sugar you need. Check out this thread. I'll quote what seems like sound advice:

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Originally Posted by Yooper View Post
The easiest way is to prime as usual, ... then fill the keg.... Headspace isn't an issue at all- you can put the co2 on the keg, and purge the headspace several times to displace any air with co2.

And it will carbonate quite a bit in the keg, after priming, but you can also force carb to correct any lack of carbonation. It might even have more carbonation than you desire. Usually you use 1/2 the amount of priming sugar for a full keg, so I'm not sure how much you'd use for a keg that's only half full. If it's a little overcarbed, that's easy to fix just by releasing the pressure a few times.
So, you can prime with 1/2 as much sugar as you otherwise would have, and force carb if it comes up short. Or you can use the originally called for amount and purge if it's over-carbed. Since you want to carb it with the priming sugar, I'd go with the original amount and purge if necessary.
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Old 07-14-2013, 09:12 PM   #7
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I found a priming calculator on Northern brew website. I'll go with what it says. If its over for some reason I'll just purge it out.
I finally got my CO2 tank in so I can put my priming sugar and beer in the keg, hit it with 20 PSI and then let it sit for a month or so.(I don't need the beer now)

Thanks for the replies guys

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