New Giveaway - Wort Monster Conical Fermenter!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Great attenuation on first AG




Reply
 
LinkBack Thread Tools Display Modes
Old 02-19-2007, 02:12 PM   #1
ayrton
Feedback Score: 0 reviews
 
ayrton's Avatar
Recipes 
 
Join Date: Aug 2006
Location: South Jersey
Posts: 809
Liked 1 Times on 1 Posts

Default Great attenuation on first AG

I thought my efficiency would suck, so I upped my grain bill to adjust for it. I ended up with an OG of 1.062 with 12.5 pounds of grain, and while I'm not going to bother calculating efficiency, I have a feeling that's not bad.

Anyway, I just checked my FG this morning (I transferred to secondary last night but had to borrow a hydrometer this morning) and it was 1.009, and this was with White Labs Irish Ale yeast, which is listed at 69 - 74%. Mine was over 85%! I think my mash temperatures might have accounted for it: I aimed for 153, but at the end of an hour, it was at 149. I need to find a way to keep the temperature up. I've never had a FG below 1.018, so I'm pretty psyched.



__________________
Primary 1: None
Primary 2: None
Secondary 1: None
Conditioning: None
Drinking: None (!)
Recently Kicked: None
Up Next: Beats me!
ayrton is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2007, 02:21 PM   #2
Orfy
For the love of beer!
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
Orfy's Avatar
Recipes 
 
Join Date: Sep 2005
Location: Cheshire, England
Posts: 11,853
Liked 64 Times on 50 Posts
Likes Given: 30

Default

Well done.

Rough rule of thumb efficiency. based on approx potential of 1037 ppg from grain

OG 1062 on 12.5lb for 5 gallon (us).

62/(12.5*37/5.5=84)
_________________
100




74%



Well done.

And yes a lower mash temp gives a more fermentable wort. I like a little residual sweetness so up it a little.


Edit: I made a mistake I stated based on 5 gal but calculated on 5.5 gallon. at 5 gallon to the fermenter it's 67% still okay for the first outing.




Last edited by Orfy; 02-19-2007 at 02:44 PM.
Orfy is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2007, 02:28 PM   #3
ayrton
Feedback Score: 0 reviews
 
ayrton's Avatar
Recipes 
 
Join Date: Aug 2006
Location: South Jersey
Posts: 809
Liked 1 Times on 1 Posts

Default

Quote:
Originally Posted by orfy
Well done.

Rough rule of thumb effeciency. based on approx pottential of 1037 ppg from grain

OG 1062 on 12.5lb for 5 gallon (us).

62/(12.5*37/5.5=84)
_________________
100




74%



Well done.

And yes a lower mash temp gives a mor fermentable wort. I like a little residual sweetness so up it a little.
Ha! Thanks. I better raise my temps a little next time, especially as this was *supposed* to be an Irish Red. It's too dark and not malty enough, so I don't know what the hell to call it.

Edit: do you calculate the efficiency based on the OG of the pre-boil volume and OG or the post-boil?
__________________
Primary 1: None
Primary 2: None
Secondary 1: None
Conditioning: None
Drinking: None (!)
Recently Kicked: None
Up Next: Beats me!

Last edited by ayrton; 02-19-2007 at 02:30 PM.
ayrton is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2007, 02:59 PM   #4
DesertBrew
You're not my type
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
DesertBrew's Avatar
Recipes 
 
Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 5,442
Liked 76 Times on 72 Posts
Likes Given: 145

Default

I usually measure pre-boil volume but I don't think it really matters, just do it the same each time. I too noticed a lower FG when I switched to AG but is related to rest temp and I usually am in the 151-153 range for most my brews.

EDIT - another good reason to do pre-boil would probably be if you're adding any adjuncts to the boil such as honey, brown sugar etc.

__________________
DesertBrew is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2007, 03:26 PM   #5
Orfy
For the love of beer!
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
Orfy's Avatar
Recipes 
 
Join Date: Sep 2005
Location: Cheshire, England
Posts: 11,853
Liked 64 Times on 50 Posts
Likes Given: 30

Default

Post boil. (It does matter where you do it)

Here's an easier way to look at it. (The way I was doing it is messy and easy to get mixed up)

12.5lbs of grain with a potential gravity of 1037 so that at total potential

of 12.5.*1037 = 462.5

your mash gets 8 gallon at 1045 so a total of 1045*8=360 So mash efficiency = (360/462.5)*100 = 78%

So at the Kettle post boil efficiency = 5.5 gallon at 1062 = total gravity of 5.5*62=341 So (341/462.5)*100 = 74%

At the fermenter brew house efficiency: is 5 gallon at 1062 = total gravity of 5*62=310 so (300/462.5)*100 = 67%

if it was 4.5 gallon at 1060 then 4.5*62=279 so 279/462.5= 60% (beginning to suck)


You only really need to do these calculations once unless you change something or have a problem.
It's nice to know but once you dial it into the recipe and you are hitting targets then you can leave it be.


Last edited by Orfy; 02-19-2007 at 03:37 PM.
Orfy is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2007, 03:41 PM   #6
ayrton
Feedback Score: 0 reviews
 
ayrton's Avatar
Recipes 
 
Join Date: Aug 2006
Location: South Jersey
Posts: 809
Liked 1 Times on 1 Posts

Default

Quote:
Originally Posted by orfy
Post boil. (It does matter where you do it)

Here's an easier way to look at it. (The way I was doing it is messy and easy to get mixed up)

12.5lbs of grain with a potential gravity of 1037 so that at total potential

of 12.5.*1037 = 462.5

your mash gets 8 gallon at 1045 so a total of 1045*8=360 So mash efficiency = (360/462.5)*100 = 78%

So at the Kettle post boil efficiency = 5.5 gallon at 1062 = total gravity of 5.5*62=341 So (341/462.5)*100 = 74%

At the fermenter brew house efficiency: is 5 gallon at 1062 = total gravity of 5*62=310 so (300/462.5)*100 = 67%

if it was 4.5 gallon at 1060 then 4.5*62=279 so 279/462.5= 60% (beginning to suck)


You only really need to do these calculations once unless you change something or have a problem.
It's nice to know but once you dial it into the recipe and you are hitting targets then you can leave it be.
Very complete, nice! Thanks.
__________________
Primary 1: None
Primary 2: None
Secondary 1: None
Conditioning: None
Drinking: None (!)
Recently Kicked: None
Up Next: Beats me!
ayrton is offline
 
Reply With Quote Quick reply to this message
Old 02-19-2007, 04:39 PM   #7
DesertBrew
You're not my type
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
DesertBrew's Avatar
Recipes 
 
Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 5,442
Liked 76 Times on 72 Posts
Likes Given: 145

Default

I let ProMash do my efficiency ratings. The only reason I've done it pre-boil was because of what the ProMash help stated. But they're basically saying what I suspected regarding adjuncts. Here's a cut/paste.

-------------

Recorded Volumes:

Anytime after you have collected all the wort from the mash and after adding any additions sugars, extracts and top-up water, you can take the recorded measurement of the volume and gravity of the wort. Based on the numbers you enter, ProMash will calculate the actual gravity points obtained from the mash and then calculate your actual mash system efficiency.

You first select when/where the measurement was taken by choosing either the "Measurement Taken In Kettle" radio button of the "Measurement Taken In Fermenter" radio button.

Recording the Measurement In the Kettle:

Measurements taken in the kettle will only consider the full recorded volume in making the efficiency calculation:


While we consider the most accurate time to take the "in-kettle" measurement to be immediately before boiling, a brewer can actually record this measurement anytime from pre-boil to the end of the boil, as long as it is taken before any wort is drained from the kettle.



__________________
DesertBrew is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
great great great grand dad RockJeep Commercial Brew Discussion 15 08-16-2009 10:04 PM
94% attenuation dsdrake219 Cider Forum 5 04-11-2009 01:57 PM
Great day for great beer peterfuse General Beer Discussion 2 11-24-2007 02:32 AM
Great attenuation! Professor Frink All Grain & Partial Mash Brewing 8 04-21-2007 08:11 PM
Great place in NJ to get great beer! Erbium:YAG Commercial Brew Discussion 3 09-29-2006 12:59 PM