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Old 11-09-2012, 10:24 PM   #1
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Default Filling your carboy (Also the Imp vs US Gallon problem)

So I'm 6 brews in (4 all grain) now and have figured out a bunch of my mistakes, but the US vs UK gallon thing still confuses me no end.
Carboys are 6 US gallon, 5 Imperial, and I know that most recipes list in US gallons, but why is it that a lot of recipes don't use the full volume of the carboy/primary? I thought it was bad to leave a lot of airspace over the beer, or is that a misconception too?

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Old 11-09-2012, 10:40 PM   #2
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Part of your confusion may be that a US gallon IS an imperial gallon. The rest of the world uses UK or metric measurements.

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Old 11-09-2012, 10:41 PM   #3
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It is. You want plenty of head space for primary fermentation or you will have a mess on your hands when that krausen shhoots all over your ceiling.
I do my primary in 6-1/2 gallon and 8 gallon buckets.
"IF" you do a secondary, then you want limited head space

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Old 11-09-2012, 10:44 PM   #4
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Quote:
Originally Posted by menerdari View Post
It is. You want plenty of head space for primary fermentation or you will have a mess on your hands when that krausen shhoots all over your ceiling.
I do my primary in 6-1/2 gallon and 8 gallon buckets.
"IF" you do a secondary, then you want limited head space
This. And when you have active fermentation happening, the headspace will soon fill with co2, pushing the air out.
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Old 11-09-2012, 10:44 PM   #5
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Quote:
Originally Posted by rhoop View Post
Part of your confusion may be that a US gallon IS an imperial gallon. The rest of the world uses UK or metric measurements.
Sorry, wrong. 1 Imperial gallon = 1.2 US gallons
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Old 11-09-2012, 10:55 PM   #6
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Quote:
Originally Posted by menerdari View Post
Sorry, wrong. 1 Imperial gallon = 1.2 US gallons
Yeah, I have a 10 imperial gallon keg that holds 12.2 gallons of water, so I can confirm this in practice.
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Old 11-10-2012, 06:03 AM   #7
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Wow, I've never caught until now that an imperial gallon is not part of the imperial measurement system, but is in fact a metric measurement. So the US uses imperial measurements, but not imperial gallons. Everybody else uses metric measurements, and imperial gallons. Who thought of that.

Didn't mean to thread jack, definitely +1 on the extra head space comments.

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Old 11-10-2012, 06:12 AM   #8
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There are no gallons in the metric system. Only liters are used to measure liquid. I think the imperial gallon is the way they used to measure liquid, but not since I've been educated. From a 32 year old Canadian.

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Old 11-10-2012, 06:50 AM   #9
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Overall it's ridiculous and I hate it either which way, but I force myself to just concede and use all US standards, it's just easier. Except Liters. How Liters somehow remains so highly used in a dominantly US forum, when a quart is practically the same thing....but again, it's all nuts.

Would that we could all just have a single way of measuring, but then what would all the calculators do, right?

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Old 11-14-2012, 12:03 AM   #10
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But the real question is when you go to a brew pub in the US and order a pint do you really get a pint.?

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