Corney Weight and CO2 - Home Brew Forums

 Home Brew Forums > Corney Weight and CO2

01-02-2007, 11:34 PM   #1
digdan

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I have a corney keg that I've drank quite a bit from. I'm going to bottle the rest but I need to know how many bottles/caps to santize and get ready.

I would think its simple math, maybe simpler than this.

The tare weight of my keg is 8lbs

when the keg was full it weighed 49lbs

The keg now weighs 23lbs

I need to subtract the tare weight from both the full kegs weight and the none-full kegs weight

liquid net weight = (full keg weigh total - keg tare weight) or (49 - 8)
wich is 41

Now for the not full weight. which is 23lbs - 8lbs(tare weight) = 15lbs

to get the % of weight left its simply (not full weight / full weight) or 15 divided by 41, which is 0.365 or roughly 37% of the liquid is left.

Now lets work in ounces. How many ounces are in my full five gallon corney keg? 128 ounces per gallon would make it (5 * 128) = 640 fl ounces.

if 100% = 640 ounces. Then 37% should be around 237 fl ounces.

237 fl ounces, each of my bottles being 12fl ounces would mean I would need around 20 bottles...

Is this correct, or does CO2 have significant weight that I should be calculating?

I don't have to be dead on, since I ussually clean more bottles and caps just incase I run into a problem, or get clumsey and drop a couple.

Also is there a simpler way to measure fluid ounces of beer on a weight scale? I noticed in this calculation I have 16.5fl ounces per pound. Or does beer variety change the actually weight per volume of beer, I could see how high alcohol beers would weigh less than low alcohol beers?

Thx

01-02-2007, 11:36 PM   #2
Brewsmith

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A pint a pound, the world around.
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01-02-2007, 11:48 PM   #3
david_42

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The weight of the CO2 is well under a pound.
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01-03-2007, 03:03 AM   #4
ajf
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Quote:
 Originally Posted by Brewsmith A pint a pound, the world around.
Except for all those places in the world that use the Imperial Pint where a pint of water weighs a pound and a quarter.

-a.

01-03-2007, 03:51 AM   #5
Spyk'd

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I wouldn't worry about the CO2 weight and get the pounds into ounces as quickly as possible.

Most liquids are right around 8lbs/gallon. You have 15lbs of beer left, divided by eight leaves you with about 2 gallons of beer. 2 gallons is about 22 12 once bottles. There, you're done.

01-03-2007, 04:04 AM   #6
bandt9299
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01-03-2007, 05:43 PM   #7
Mikey
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Quote:
 Originally Posted by digdan Also is there a simpler way to measure fluid ounces of beer on a weight scale?
When are you guys in the US colony going to break the finals ties with Mother England and ditch the Imperial measurement system?

01-03-2007, 05:50 PM   #8
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Quote:
 Originally Posted by Mikey When are you guys in the US colony going to break the finals ties with Mother England and ditch the Imperial measurement system?
So says the man from the country with a picture of the Queen in every govm't building.
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01-03-2007, 06:43 PM   #9
Orfy
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Nothing wrong with the "Queen". I like a bit of "We will rock you"

I'm metric.....but leave my Pint alone.
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01-04-2007, 01:53 AM   #10
digdan

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A pint a pound the world around, except Canada... then its 473 milliliters per 453 grams