Gravity Issues - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > General Techniques > Gravity Issues

Reply
 
Thread Tools
Old 09-07-2013, 10:15 PM   #1
DarthBrewer87
Recipes 
 
Jan 2013
Posts: 15
Liked 1 Times on 1 Posts



I have brewed two batches of beer all grain with my new equipment. I use a dual scale refractometer to get my gravity readings. My problem is that all of my gravity readings are far off from where BeerSmith estimates them. My Imperial Pumpkin Ale had an estimated OG of 1.106 and my actual reading was 1.075
Please help me get this figured out

 
Reply With Quote
Old 09-07-2013, 10:33 PM   #2
WoodlandBrew
HBT_SUPPORTER.png
 
WoodlandBrew's Avatar
Recipes 
 
Oct 2012
Malden, MA
Posts: 2,191
Liked 244 Times on 199 Posts


My guess is lautering efficiency. With a big beer like that you need either a very large tun, or lots of sparging and significant boil off. Search my blog for "more grain less sugar"

My book has some nice tables that can be used to trouble shoot this type of problem.
__________________
The 2nd edition is now available: Brewing Engineering
Woodland Brewing Research Blog Applied Science for Better Beer.

 
Reply With Quote
Old 09-07-2013, 11:16 PM   #3
duboman
Recipes 
 
Jul 2011
Glenview, IL
Posts: 6,368
Liked 508 Times on 470 Posts


To add: are you getting a good crush? Are you fly or batch sparging? Are you meeting the estimated pre-boil gravity? Are you hitting all your volumes?

Lots of variables to consider and typically efficiency will drop a bit as the grist goes up in weight
__________________
Nothing Left to do but smile and drink beer.....

The Commune Brewing Company-Perfecting the "art" of beer since 2010

 
Reply With Quote
Old 09-08-2013, 10:35 PM   #4
DarthBrewer87
Recipes 
 
Jan 2013
Posts: 15
Liked 1 Times on 1 Posts


We are batch sparging, the first batch we did was a dry stout and the est pre boil gravity was 1.038 and our actual was 1.028. we are hitting our volumes pretty close (a bit high by about .5 gallons). Also the temps for the mash came out spot on to what Beer Smith said they should be.

 
Reply With Quote
Old 09-08-2013, 11:24 PM   #5
WoodlandBrew
HBT_SUPPORTER.png
 
WoodlandBrew's Avatar
Recipes 
 
Oct 2012
Malden, MA
Posts: 2,191
Liked 244 Times on 199 Posts


I've had trouble with taking hit wit samples pre boil even when compensating for temperature. Could temperature be an issue?
__________________
The 2nd edition is now available: Brewing Engineering
Woodland Brewing Research Blog Applied Science for Better Beer.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Final gravity issues General_Steve Beginners Beer Brewing Forum 12 02-19-2013 07:54 PM
SG/ Gravity Issues Somebirs Beginners Beer Brewing Forum 6 09-22-2011 05:59 PM
First Batch Gravity Issues nopunk Beginners Beer Brewing Forum 3 02-11-2011 10:54 AM
Issues with Gravity OblivionsGate Beginners Beer Brewing Forum 5 09-25-2007 07:31 PM
Gravity Issues LSUGrad00 Beginners Beer Brewing Forum 2 08-30-2007 04:14 AM


Forum Jump