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Old 04-22-2013, 02:30 PM   #1
eryk4381
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Jan 2012
Wilsonville, OR
Posts: 98


For some reason this weekend when I brewed an all grain batch it came out way different that I had calculated. I was making a strong dry IPA and beersmith had told me that it would have an OG of 1.070 and Pre boil gravity or 1.070. I had mashed at 148 for an hour then brought it up to about 156 to fly sparge (I wanted it at 170 but never got it that high). I took my pre boil reading to get a sense of where I was at and came up with an OG of around 1.036!!! WTF!! I figure I would get more without even crushing the grains that's so bad.
I am not sure what I could have done wrong here. Any ideas?
I attached my brew sheet.

Also, here are my notes during the brew session:
Used Cascade hops instead of orginal Centennials at same schedule.
Used Willamette hops instead of orginal Amarillo at same schedule.

7.40 gallons Mash water needed
6.33 gallons Sparge water needed

Mashing @ 148 for 1 hour
Bring up to 156 for 10 mintues
Fly sparge @ 170

Used two different yeast; One for 4 gallons each. Both as starters.

did not end up getting the 170 on the fly spare; I got about 154 at best.
saved runoff from the rest of the mash to make a pale

Add corn sugar 10 min till flame out
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Old 04-22-2013, 02:37 PM   #2
billl
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May 2012
Raleigh, NC
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How are you measuring your gravity?

 
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Old 04-22-2013, 02:47 PM   #3
matt-tastic
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Apr 2012
Concord, NC
Posts: 85
Liked 12 Times on 6 Posts


I went small when switching to AG, and built a convertible mash tun (meaning i could take it apart and put it on a larger tun) at 2 gallons. My biggest issue was my Brewhouse efficiency. mine was at 70%, and I was still way lower than my targets. yours at 75% is probably too high as well.

Another thing, initially when i was trying to figure it out, I was taking gravity readings with hot wort, and not calculating for the temp changes. Once I calculated for temp differences (I use this calculator), I was closer, but still off. A combination of these may be partially to blame.

Again, these are from my experience (with 1 highly irregular setup), so none of this may apply to you.

 
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Old 04-22-2013, 02:48 PM   #4
bknifefight
HBT_SUPPORTER.png
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Dec 2009
PA
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If this wasnt your first AG batch and you previously had some consistency with your efficiency, I would look into how you took the gravity reading and it's calibration.

If this is your first batch doing AG, it's hard to narrow down where you could be running into an issue. How was your crush?

 
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Old 04-22-2013, 03:06 PM   #5
eryk4381
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Jan 2012
Wilsonville, OR
Posts: 98

Quote:
Originally Posted by billl View Post
How are you measuring your gravity?
Using a Hydrometer and adjusting for Temp and hydrometer adjustments

 
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Old 04-22-2013, 03:09 PM   #6
eryk4381
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Jan 2012
Wilsonville, OR
Posts: 98

Quote:
Originally Posted by bknifefight View Post
If this wasnt your first AG batch and you previously had some consistency with your efficiency, I would look into how you took the gravity reading and it's calibration.

If this is your first batch doing AG, it's hard to narrow down where you could be running into an issue. How was your crush?
I have been doing all grain for awhile. Most of the time i see my efficiency a bit low but never this bad. Really insane.

 
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Old 04-23-2013, 03:43 PM   #7
eryk4381
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Jan 2012
Wilsonville, OR
Posts: 98

Could it have been from the loss of sugars in the deapspace? It looks like I may have an issue with deadspace as it may be around 1-2gallons

My drawing is remedial at best but it show what I had setup basically and I think the way the mesh may have been stirred up into the mash and not laying at the bottom (plus i had and extra length of vinyl tubing in there) it did get all the good sugars at the bottom.
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Old 04-23-2013, 03:56 PM   #8
forsaken541
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Feb 2013
Posts: 21
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How was your grain? I recently had the same issues brewing a Porter. When adding grain to mash tun cooler I noticed it was ground pretty fine not just cracked. I think mine was from stuck sparge due to floury grain bed.

 
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Old 04-23-2013, 04:06 PM   #9
SudsyPaul
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Nov 2012
Ottawa, Ontario
Posts: 361
Liked 47 Times on 35 Posts


Your OG is WAY low... That sort of loss of efficiency seems strange.

Did you stir your wort before measuring? There can be stratification when you're sparging, and maybe you just measured the late runnings?

I batch sparge, but I don't take my reading until everything is in the kettle and has been stirred up super-well. Forgot to stir a few times and almost dropped a deuce when my readings were 20-30 points too low.

 
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Old 04-23-2013, 06:06 PM   #10
eryk4381
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Jan 2012
Wilsonville, OR
Posts: 98

Quote:
Originally Posted by forsaken541 View Post
How was your grain? I recently had the same issues brewing a Porter. When adding grain to mash tun cooler I noticed it was ground pretty fine not just cracked. I think mine was from stuck sparge due to floury grain bed.
I was fine but no more than normal..

 
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