help me understand somthing - Page 2 - Home Brew Forums
Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > help me understand somthing

Reply
 
Thread Tools
Old 09-17-2012, 07:25 PM   #11
ajf
Senior Member
HBT_LIFETIMESUPPORTER.png
 
ajf's Avatar
Recipes 
 
Oct 2005
Long Island
Posts: 4,646
Liked 105 Times on 99 Posts


Another note on precision.
You will be estimating your volumes at different temperatures, and the volume of a given mass of wort at one temperature will be different to the volume of the same mass of wort at another temperature.
You would lose approximately 4% of volume cooling the wort from boiling point down to 60F.

Also, at the start of the boil, you will have some proteins dissolved in the wort and will therefore contribute to the pre-boil gravity reading. During the boil, these proteins will be precipitated as break material, and once precipitated, will no longer contribute to the gravity, even if the sample was taken from the kettle. Of course, if you take the final sample from the fermenter, you will have to account for the cold break, hop and trub absorption, dead space in the kettle, and wort trapped in equipment.
Taking these factors into consideration with my equipment, I lose about 4 - 5 gravity points between taking my pre-boil sample and measuring the gravity in the fermenter.

-a.


__________________
There are only 10 types of people in this world. Those that understand binary, and those that don't.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help me understand how much water to use Ben_Persitz All Grain & Partial Mash Brewing 2 12-05-2010 02:32 AM
Help me understand efficiency petep1980 All Grain & Partial Mash Brewing 5 08-15-2010 05:28 PM
Do I understand this right? murphyslaw All Grain & Partial Mash Brewing 7 06-09-2009 11:54 PM
Somthing for my Valentine Superman3278 All Grain & Partial Mash Brewing 1 02-14-2009 02:54 PM
Trying to understand PM waterse All Grain & Partial Mash Brewing 7 08-15-2008 05:02 AM


Forum Jump