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Old 08-23-2012, 07:15 PM   #1
duckredbeard
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Default Where is 5 gallons in a corny?

I know I could use a known volume of a flask or such to calibrate a corny volume. Call me lazy. Where exactly is the 5 gallon mark on a corny keg? The weld? Up to the gas in tube?

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Old 08-23-2012, 11:25 PM   #2
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I've always used the weld as a guide. It's close enough for me.

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Old 08-24-2012, 03:26 AM   #3
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Quote:
Originally Posted by duckredbeard
I know I could use a known volume of a flask or such to calibrate a corny volume.
how exactly do you know your flask is correct?
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Old 08-24-2012, 10:57 AM   #4
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I'm expecting a 2L Erlenmeyer flask from a lab supply retailer (Fisher Scientific) to be accurate.

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Old 08-24-2012, 11:22 AM   #5
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i always mark my carboys at the 5g line. - and usually never transfer a full 5g to the keg due to trub loss etc.

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Old 08-24-2012, 01:37 PM   #6
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Water (SG 1.000) weighs 8.328676 lb/gal. Get an accurate scale, add water till you get 41.54 lbs. net

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Old 08-24-2012, 01:59 PM   #7
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Just whatever you do don't fill it above the short tube.

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Old 08-24-2012, 02:00 PM   #8
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Depends on what you mean by accurate. Erlenmeyers are NOT accurate by lab standards--a graduated cylinder is a better choice.

The weigh method is much better, but remember that only distilled water at 20 C has that density.

Accuracy may be over-rated in brewing. As long as you brew the same way, any errors should cancel out from batch-to-batch giving reproducible results.

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