Happy HolidaySs Giveaway - Winners Re-Re-Re-Re-Drawn - 24 hours to Claim!

Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > under o.g
Reply
 
LinkBack Thread Tools
Old 12-23-2011, 06:48 PM   #1
kerant
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2011
Location: Belle River, Ontario
Posts: 225
Liked 3 Times on 3 Posts

Default under o.g

I'm starting O.G in a few weeks. So if my o.g is under 10-20 points can I add dextrose and about how much? thanks

__________________
kerant is offline
 
Reply With Quote Quick reply to this message
Old 12-23-2011, 07:11 PM   #2
frazier
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: illinois
Posts: 1,767
Liked 107 Times on 95 Posts
Likes Given: 8

Default

Quote:
Originally Posted by kerant View Post
I'm starting O.G in a few weeks.
I don't know what this means.

Yes you can boost the gravity by adding dextrose. One pound will add roughly 8 points to a five gallon batch.

What exactly are you trying to do??
__________________

~
"Anything worth doing, is worth doing slowly." ~~ Mae West

frazier is offline
 
Reply With Quote Quick reply to this message
Old 12-23-2011, 07:16 PM   #3
Toga
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2010
Location: Michigan
Posts: 797
Liked 43 Times on 38 Posts
Likes Given: 4

Default

Keep a pound of dry light or extra light malt extract handy. If you miss your target gravity with your first AG brew a pound of DME will get you up another 8 or 9 points to get you where you need and will not dry out the brew like sugar will.

__________________
Toga is offline
 
Reply With Quote Quick reply to this message
Old 12-23-2011, 07:28 PM   #4
lutherslagers
Feedback Score: 0 reviews
Recipes 
 
Join Date: Feb 2011
Location: Marshall, MI
Posts: 204
Liked 3 Times on 3 Posts
Likes Given: 5

Default

I'm assuming you mean you're starting AG (all grain) next week. You want to keep a light DME (dry malt extract) on hand. It will allow you to do gravity adjustments using the following formulas from Ray Daniels' book designing great beers. Here are the formulas and then I'll explain them:

Formula 1: Pre-boil GU x Pre-boil volume / desired post-boil volume = the gravity of your wort after concentrating the sugars through boiling.

I need this formula to figure out what my gravity will be when I'm done boiling. I may be spot on and no gravity adjustment is needed. I may be way off and need to use DME in the boil to hit my desired gravity.

Before I break down the formula let me explain what a GU is. It stands for gravity unit. Its essentially the last two digits of your specific gravity. The GU of a 1.050 beer is 50. The GU of a 1.085 Dopplebock is 85. Mathematically its ((specific gravity x 1000)-1000), but who likes math.

The first part of the equation comes from values you will measure after you finish mashing and run everything into your kettle, BUT BEFORE YOU START BOILING. So you're measuring your gravity of the total volume you collected in the kettle (don't take this reading from a mash tun sample, you're gravity will be higher at the beginning of run off and lower at the end of run off). You're also measuring the total volume you collected.

Let’s say you’re readings here were 1.048 (or 48 GU) and 7.25 gallons wort. 7.25 x 48=348.

Now divide 348 by your desired volume after you’re done boiling. For me this is 6 gallons (as an aside I leave 1/2 a gallon behind in the kettle, move 5.5 gallons to my carboy and after fermentation I leave 1/2 a gallon in the carboy and move 5 gallons of trub and debris free beer to a keg)

So now we have 348/6 = 58 or a specific gravity of 1.058 after the boil. Great… but I wanted to brew a 1.065 beer. So this is where we go to Formula #2. Note that you should have used formula #1 before you started boiling your wort.

Formula 2:
(Target GU x Target Volume) - (Pre-boil GU x Pre-boil Volume) / Extract per lbs.

In the first part of the equation I'm applying the volume I want and the specific gravity I want after the boil. So I want 6 gallons of wort after the boil and my recipe is a 1.065 beer. So my first number is 6x65 = 390.

So now we have:
390 - (Pre-boil GU x Pre-boil Volume) / Extract per lbs.
The second part of this equation is identical to the first part of the first equation above. We already know that number, it is 348.

So now we have:
(390 - 348) / Extract per lbs.

Extract per lbs. for Briess light or pilsen DME is 45.

So now we have
(390 - 348) / 45 = 0.93

I need 0.93 lbs of DME added to the boil to hit my target gravity of 1.065.

__________________
lutherslagers is offline
 
Reply With Quote Quick reply to this message
Old 12-24-2011, 03:02 PM   #5
kerant
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2011
Location: Belle River, Ontario
Posts: 225
Liked 3 Times on 3 Posts

Default

Quote:
Originally Posted by frazier View Post
I don't know what this means.

Yes you can boost the gravity by adding dextrose. One pound will add roughly 8 points to a five gallon batch.

What exactly are you trying to do??
Sorry= should have been A.G. Thanks all- got what I need.
__________________
kerant is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools




Newest Threads

LATEST SPONSOR DEALS