Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Need Advice - High Attenuation & Low FG 1.002
Reply
 
Thread Tools
Old 02-13-2011, 05:28 PM   #1
Vintage63
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2010
Location: San Diego, California
Posts: 61
Liked 2 Times on 2 Posts

Default Need Advice - High Attenuation & Low FG 1.002

I just kegged a blonde ale and it finished at 1.002. I calculated an approximate apparent attenuation of 95%.

I'm looking for some advice on what might have gone sideways to bring this beer so low and dry.

Too much 2 row?
Too low mash temp?
Probobly a combination of several factors.

Recipe:

Batch Size: 5.50 gal
Boil Size: 7.00 gal
Boil Time: 60 minutes
Efficiency: 70%
Pre-boil gravity: 1.037 (Target was 1.038)
OG: 1.047 (Target was 1.044)
FG: 1.002 (Target was approx. 1.008)

7.70 lb Pale malt 2 row
0.83 lb Carapils
0.55 lb Crystal 10L
0.55 lb Vienna malt

0.28 oz Centennial (55 min)
0.28 oz Centennial (35 min)
0.28 oz Cascade (20 min)
0.28 oz Cascade (5 min)

Yeast: WLP 001 Cal Ale (1L starter)

Single infusion batch sparge in 10 gal rubbermaid with false bottom
Mashed at 150 for 60 minutes

Thanks for any feedback out there. I'd like to brew this again this summer.


Vintage63 is offline
 
Reply With Quote
Old 02-13-2011, 05:31 PM   #2
Vintage63
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2010
Location: San Diego, California
Posts: 61
Liked 2 Times on 2 Posts

Default

I fermented in temp controlled environment at 65 F.


Vintage63 is offline
 
Reply With Quote
Old 02-13-2011, 05:41 PM   #3
GuldTuborg
HBT_SUPPORTER.png
Feedback Score: 2 reviews
 
GuldTuborg's Avatar
Recipes 
 
Join Date: Mar 2010
Location: OH
Posts: 3,978
Liked 698 Times on 477 Posts
Likes Given: 485

Default

Are you sure everything is calibrated right? That seems to be a pretty low gravity for a recipe with over a pound of crystal malt. You didn't mash particularly low at 150, either. My first guess would be a problem with your instruments, but I might be wrong. How does it taste?
__________________
*Member: The HBT Sweaty Fat Guys Cigar Club
GuldTuborg is online now
 
Reply With Quote
Old 02-13-2011, 06:13 PM   #4
Vintage63
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2010
Location: San Diego, California
Posts: 61
Liked 2 Times on 2 Posts

Default

Sounds like the recipe looks alright. Haven't tasted it yet, so that variable still needs to be checked.

I calibrated my refractometer just before checking FG, and then plugged reading into Beer Smith to adjust for presence of alcohol. I did not calibrate before checking OG.
Vintage63 is offline
 
Reply With Quote
Old 02-13-2011, 08:08 PM   #5
orangehero
HBT_SUPPORTER.png
Feedback Score: 3 reviews
 
orangehero's Avatar
Recipes 
 
Join Date: Apr 2010
Location: Northeast
Posts: 1,462
Liked 228 Times on 142 Posts
Likes Given: 316

Default

Did you do a mash-out?
orangehero is offline
 
Reply With Quote
Old 02-13-2011, 08:10 PM   #6
JonK331
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2009
Location: Fremont, CA
Posts: 2,101
Liked 32 Times on 32 Posts
Likes Given: 6

Default

Sounds like a problem with your refractometer. Cross check FG with hydrometer.
JonK331 is offline
 
Reply With Quote
Old 02-13-2011, 08:52 PM   #7
Vintage63
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2010
Location: San Diego, California
Posts: 61
Liked 2 Times on 2 Posts

Default

Well, I actually tried to fly sparge for the first time with water at 168 F. This is my 4th AG batch and thought to try fly. No formal mash out.

Sounds like that might have been an issue and the mash was still converting?
Vintage63 is offline
 
Reply With Quote
Old 02-13-2011, 08:57 PM   #8
CPooley4
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2009
Location: Cottage Grove, Wisconsin
Posts: 393
Liked 14 Times on 8 Posts

Default

I second JonK. Double check with a hydrometer. That recipe/method doesn't look like a likely scenario for 95% attenuation.
__________________
CP's Brew Workbook

If you're considering buying brewing software do yourself a favor and download my Brew Chart/Workbook first. You may not need to spend that money.

I like beer math!
CPooley4 is offline
 
Reply With Quote
Old 02-13-2011, 10:23 PM   #9
Vintage63
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2010
Location: San Diego, California
Posts: 61
Liked 2 Times on 2 Posts

Default

Thanks Jon & CP. I'll go back and double check for sure.
Vintage63 is offline
 
Reply With Quote
Old 02-14-2011, 12:40 AM   #10
Vintage63
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2010
Location: San Diego, California
Posts: 61
Liked 2 Times on 2 Posts

Default

You guys were right. Went to double check. Hydrometer came in at 1.006 and calibrated refractometer came in at 5.50 brix = 1.007.


Vintage63 is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
High Attenuation with US-05 carp Fermentation & Yeast 26 05-02-2014 05:25 AM
Very high attenuation with WLP002 bolts Fermentation & Yeast 16 06-07-2011 12:36 PM
S-04 and Way too high attenuation RichBenn Fermentation & Yeast 22 11-04-2010 02:53 AM
Wyeast 1968 surprisingly high attenuation Scroto Fermentation & Yeast 3 08-27-2010 03:24 PM
High FG and poor attenuation brelic Fermentation & Yeast 2 01-21-2010 07:29 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS