Not enough in fermenter - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Not enough in fermenter

Reply
 
Thread Tools
Old 08-23-2012, 04:20 AM   #1
Pilotpip
Recipes 
 
Oct 2011
St. Louis, MO
Posts: 75


Just switched to BIAB and on the last two brews I've managed to get only 4.5 gallons into the fermenter. I've been pretty close on my numbers and had good efficiency so I have good beer, just not as much.

When extract brewing I started with 6.5 gallons of water and had just over 5 after an hour boil. I figured the boil rate would be the same but apparently it is not. Any ideas? Should I simply adjust to have more wort at the start of the boil?
__________________
Warm beer is infinitely colder than no beer at all.

 
Reply With Quote
Old 08-23-2012, 04:26 AM   #2
fifelee
 
fifelee's Avatar
Recipes 
 
Dec 2006
Vaughn, MT
Posts: 1,046
Liked 40 Times on 27 Posts


The boil off rate won't be any different as long as you are using the same pot. If you are hitting your numbers and getting the efficiency you want then you need more grain.

 
Reply With Quote
Old 08-23-2012, 11:30 AM   #3
RM-MN
HBT_SUPPORTER.png
Recipes 
 
Nov 2010
Solway, MN
Posts: 9,757
Liked 1751 Times on 1393 Posts


Did you squeeze all the wort you could out of the bag? You could be losing 1/2 gallon right there. If that isn't the case, try doing a dunk sparge with your bag of grain to get more sugars and liquid into your boil kettle.

 
Reply With Quote
Old 08-23-2012, 11:38 AM   #4
chally
 
chally's Avatar
Recipes 
 
Jul 2012
Washington, DC
Posts: 52
Liked 1 Times on 1 Posts


Are you accounting for increased grain absorption? If you are putting 10+ pounds of grain into 6.5 gallons of water, the spent grain takes a lot with it when you pull it. Or did you mean you are starting with 6.5 gallons post-mash? I agree with the above poster that your boil off rate should be the same as before.

Either way, the solution is to add more water at the front end and add more grain if you need it to hit your numbers in the larger volume.

 
Reply With Quote
Old 08-23-2012, 11:38 AM   #5
T-Dan
Recipes 
 
Feb 2012
Deltona, Florida
Posts: 50
Liked 3 Times on 3 Posts


What I have noticed from doing partial mashes is that the LME and Dme take up some space in the kettle during the boil. So if you use more grain, and less extract, you will seem to have more boil off.

In other words, based on the marks i have on my stir paddle, my boil volume will go up as i add extract, as much as half a gallon if adding LME and DME.
__________________
Tap 1 - DanDan the Elder DIPA (Sorta Pliny Clone)
Tap 2 - Rye Rhapsody Bohemian Pilsner
Tap 3 - Irish Red (Fermenting)
Tap 4 - Raisin Brown Ale
On Deck - Some other DIPA

In Bottles: Maple Barleywine, Peanut Butter Porter, Strawberry Ginger Cream Ale, Sweet Ruination IPA

 
Reply With Quote
Old 08-23-2012, 12:20 PM   #6
wilserbrewer
BIAB Expert Tailor
HBT_SPONSOR.png
 
wilserbrewer's Avatar
Recipes 
 
May 2007
Jersey Shore, New Jersey
Posts: 9,694
Liked 1461 Times on 1111 Posts


Yes! start w/ more water, and measure your pre boil volume....if low, you can trickle some sparge water through the grainbag to reach req'd volume.

 
Reply With Quote
Old 08-23-2012, 03:01 PM   #7
Pilotpip
Recipes 
 
Oct 2011
St. Louis, MO
Posts: 75

That's where I'm confused. I am measuring my volume and starting with the exact same pre-boil volume as I was when doing extract. I guess I'll up my strike water to compensate. So far I'm getting good (70-75%) efficiency out of no sparge so I'll hold off on that and maybe add a bit more to the strike water.

Thanks
__________________
Warm beer is infinitely colder than no beer at all.

 
Reply With Quote
Old 08-23-2012, 03:27 PM   #8
chally
 
chally's Avatar
Recipes 
 
Jul 2012
Washington, DC
Posts: 52
Liked 1 Times on 1 Posts


Quote:
Originally Posted by Pilotpip View Post
That's where I'm confused. I am measuring my volume and starting with the exact same pre-boil volume as I was when doing extract. I guess I'll up my strike water to compensate. So far I'm getting good (70-75%) efficiency out of no sparge so I'll hold off on that and maybe add a bit more to the strike water.

Thanks
Interesting. If your pre-boil volume is the same, there are only a few places where the loss could be occuring.

1. Pre-boil measurement. If you measured your extract water at 6.5 gallons cold and your all-grain water at 6.5 gallons hot, then you would actually have more extract water (hot water expands).

2. Boil length and intensity. Assuming you are boiling for the same amount of time in the same pot, you might be getting more boil off with all grain because you are not taking the pot off the boil to add the extract (which also cools down the wort).

3. Trub. If you are using Irish Moss or Whirlfloc in the boil, you might be leaving more protein and hops trub in your boil kettle with your all grain brews than you were with extract.

Assuming all of your equipment and techniques are otherwise the same, those are about the only things I can think of to account for the loss.

 
Reply With Quote
Old 08-27-2012, 02:29 PM   #9
Pilotpip
Recipes 
 
Oct 2011
St. Louis, MO
Posts: 75

I'm thinking 2 is the culprit. Most extract kits that I did had 1/2 gallon lme in them.

Oh well, the next couple batches will only have about 40 bottles of good beer instead of 50
__________________
Warm beer is infinitely colder than no beer at all.

 
Reply With Quote
Old 08-27-2012, 02:43 PM   #10
ReverseApacheMaster
Registered User
Recipes 
 
Jul 2009
Keller, Texas
Posts: 4,882
Liked 254 Times on 196 Posts


Sounds like you are not accounting for grain absorption.

 
Reply With Quote
Reply
Thread Tools



Forum Jump