Hop quant. for 2 brewpots full boil

Physics, chemistry and biology of brewing. The causes and the effects.

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kabbo
Pale Ale
Pale Ale
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Joined: Sat Mar 11, 2006 12:46 pm

Hop quant. for 2 brewpots full boil

Post by kabbo » Tue Mar 21, 2006 11:35 pm

I am soon moving to all-grain but can't afford a propane burner and ss mega pot so I will be boiling with two 5gal canning pots. I do 6 gal batches so I plan to collect 8 gallons of wort (4gal by pot) that will boil down to 3 gals each. I understand that the concentration remains the same, since 3gals of 1.050 wort added to another 3gals of 1.050 wort will simply give 6gals of 1.050.

My question is about the hops. Do I have to split the quantity in half for each pot ?? I know the utilisation is a matter of AAU and gravity (and some other factors) so the IBU in each pot will be half of the predicted IBU for the 6 gal batch.

Do IBUs add up ?? Ex: 3 gals of 20IBU + 3 gals of 20IBU = 6 gals of 40IBU ???

I read in John Palmer's How to brew :

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brewmeisterintng
Strong Ale
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Logic

Post by brewmeisterintng » Sun Jul 09, 2006 9:46 am

You have two three gallon batches. If, independently their IBU's = 20, then if you combined the two, the IBU's will still be 20 not 40. You could put all the hops in one 3 gallon batch and 0 in the second and get an IBU of 40 in the first batch but when you combine the two you have to divide by 2 = 20 IBU's

Regards

James

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