Technique for determining pre boil gravity with a split boil...?

Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum

Help Support Homebrew Talk:

hagbardceline

Well-Known Member
Joined
May 22, 2008
Messages
81
Reaction score
1
Location
St. Paul
I am boiling on a stove top so I have been splitting my wort into two 5 gallon kettles. As I am collecting my wort I drain into a measuring cup then dump into boil kettles.

So usually one kettle has all the mash water and part of the first sparge then the second has the remaining sprage water...

I wonder if I simply alternate which pot i dump the wort into I can get an fairly accurate pre boil gravity reading? What do other people do?

Also since I am splashing a bit dumping the wort into the kettles should I be worried about hot side aeration? Most of the time I try to pour down the side of the kettle to reduce as much splashing as possible...
 

Yooper

Ale's What Cures You!
Staff member
Admin
Mod
Lifetime Supporter
Joined
Jun 4, 2006
Messages
74,914
Reaction score
12,812
Location
UP/Snowbird in Florida
I used to boil in two pots, and I did a "half and half" approach- put half of each runnings in each pot. Not really scientific, but my thought was that I wanted the SG approximately equal for the hops utilization.
 

4winds

Member
Joined
Apr 26, 2008
Messages
12
Reaction score
0
Location
Alaska
Collecting it all in a larger container and measuring the SG before splitting it into two boil kettles would work, but you could figure it out using "points" if you didn't have or want to use another container. If after sparging and before the boil you find that you have one kettle with 3 gallons of wort @ 1.063 and the other kettle has 3 1/2 gallons @ 1.038, the first kettle has 3 X 63 = 189 points. The second kettle has 3.5 X 38 = 133 points. Combined, you have 322 points and 6.5 gallons, or 322 / 6.5 = 49.5, or a SG of just under 1.050 for the pre-boil gravity. Boiled down to 5 gallons, the SG should be about 1.064.
 
Top