Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Technique for determining pre boil gravity with a split boil...?
Reply
 
Thread Tools
Old 10-16-2008, 03:55 PM   #1
hagbardceline
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2008
Location: St. Paul, MN - Minnesota
Posts: 78
Default Technique for determining pre boil gravity with a split boil...?

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...


hagbardceline is offline
 
Reply With Quote
Old 10-16-2008, 04:45 PM   #2
oswegan
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2008
Location: Lake Oswego, Oregon
Posts: 231
Liked 8 Times on 5 Posts
Likes Given: 1

Default

I would collect it in a larger container, take my preboil reading, and then split it up.


oswegan is offline
 
Reply With Quote
Old 10-16-2008, 04:59 PM   #3
Yooper
Ale's What Cures You!
HBT_ADMIN.png
Feedback Score: 0 reviews
 
Yooper's Avatar
Recipes 
 
Join Date: Jun 2006
Location: UP of Michigan
Posts: 65,958
Liked 6216 Times on 4428 Posts
Likes Given: 1665

Default

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.
__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Follow me on facebook: https://www.facebook.com/lorena.t.evans
But I'm pretty boring so don't expect much!
https://www.facebook.com/lorena.t.evans
Yooper is offline
 
Reply With Quote
Old 10-17-2008, 04:31 AM   #4
4winds
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2008
Location: Alaska
Posts: 13
Default

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.
4winds is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help Please --- Can I split the boil---HELP BeerArchitect54 Beginners Beer Brewing Forum 5 03-14-2009 10:57 PM
how can I determine post-boil gravity from a pre-boil gravity reading? snailsongs General Techniques 5 03-05-2009 04:42 PM
Split boil vs. full boil Brett3rThanU Beginners Beer Brewing Forum 4 01-12-2009 03:33 PM
More accurate way of determining pre-boil Eff? Sherpa FE All Grain & Partial Mash Brewing 3 07-07-2008 08:06 PM
Determining OG from the Pre-Boil Gravity? jcarson83 General Techniques 4 02-12-2007 01:41 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS