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Home Brew Forums > Home Brewing Beer > Bottling/Kegging > Fill level when racking under CO2
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Old 04-20-2014, 11:25 PM   #1
flyboy102
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Default Fill level when racking under CO2

I am new to kegging, and have just put together a system with a handful of 2.5 gallon ball lock cornelius kegs.

Racking under CO2 through the liquid out port looks appealing (as shown here)...however given a batch size of 5 gallons and a keg size of half that, is it possible to know the fill level without opening the lid or waiting for the keg to overflow?

It sure would be nice to know when to fill the second keg without breaking the seal.

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Old 04-20-2014, 11:49 PM   #2
bigken462
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I totally misread your question, but i'll keep this here for a idea later.

If you're using a keg to transfer to another keg pushing with C02, you might could weigh your empty supply 5 gallon keg, then weigh it again when it's full. As you move from 5 gallon keg to the 2.5 gallon keg, stop the transfer when your supply tank reduces by half the weight of it's original volume. The numbers might be slightly skewed with any hoses attached, but I don't think it would be much.

Now to better answer what you asked, lol

Calibrate your glass carboy ahead of time. What I mean is, know how much beer you have for, let's say 1" of fluid. Then after the beer is done, take a ruler and measure the amount of beer that you will be able to rack off the yeast cake then just keep track of how many inches you take out of the carboy.

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Old 04-20-2014, 11:57 PM   #3
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^That's a good idea that could be even a tad simpler: put as much water in the 2.5g keg as is comfortable and weigh that with the fill hose attached, then empty that keg, put it back on the scale and fill to the same weight with beer...

Cheers!

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Old 04-21-2014, 12:05 AM   #4
flyboy102
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Right, weight.. At ~8lb/gallon that method could be fairly accurate. Thanks!

Just had another thought: The gas-in port on the first keg connected to the liquid-out port of the second would allow the second to fill serially from the first, though that might leave the fill a bit too high on the first.

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