Topics Topics Help/Instructions Help Edit Profile Profile Member List Register  
Search Last 1 | 3 | 7 Days Search Search Tree View Tree View  

Visit The Brewery's sponsor!
Brews & Views Bulletin Board Service * Brews and Views Archive 2006 * Archive through October 11, 2006 * I'm having contractions < Previous Next >

  Thread Last Poster Posts Pages Last Post
  ClosedClosed: New threads not accepted on this page        

Author Message
 

Ken Anderson
Senior Member
Username: Ken75

Post Number: 1699
Registered: 11-2002
Posted From: 69.168.141.10
Posted on Monday, September 25, 2006 - 01:06 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I brewed the Great Lakes Brewing Eliot Ness clone again today. What I wound up with was 12.25 gallons of piping hot wort with an SG of 1.058. Once it cools, I should have about 11.75 gallons. Can I count on an increase in SG (to about 1.061) with this decrease in volume?

Does anybody else deal with this?

(Say Bill, nice to see you around.)

Ken

(Message edited by ken75 on September 25, 2006)
 

Tom Gardner
Advanced Member
Username: Tom

Post Number: 850
Registered: 01-2001
Posted From: 24.9.151.219
Posted on Monday, September 25, 2006 - 02:04 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

If you corected your s.g. reading for the temperature, it should remain 1.058. If not, we need to know what temperature it was. Brew on, Tom
 

michael atkins
Intermediate Member
Username: Mga

Post Number: 440
Registered: 11-2003
Posted From: 71.214.21.202
Posted on Monday, September 25, 2006 - 02:14 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Ken - You could end up higher, depending upon the way you computed the 1.058 gravity.

Did you adjust it for temperature? 1.058 (piping hot) is greater than 1.058 at 60 d. adjusted for temperature. Since you are an "old pro" You probably did not make that mistake - So -consider the following:

Reducing 12.25 Volume to 11.75 of wort at 1.058 should get you close to 1.061.

Actually I get 1.0603673 - unless my math is F--- uped!
Love This Hobby!

http://msnusers.com/micksbrewery
 

Ken Anderson
Senior Member
Username: Ken75

Post Number: 1700
Registered: 11-2002
Posted From: 69.168.141.10
Posted on Monday, September 25, 2006 - 03:15 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Actually, I used an eyedropper, which I figure cools the sample quickly with very little evaporation, and checked it with a refractometer.

I know if I boiled off that half gallon, I would get about a 3 point gravity increase. But I'm not boiling it off. I'll lose that half gallon due to wort contraction upon cooling, using the 4% rule of thumb.

So I'm wondering if I'll still get those 3 points.

Also, a half gallon is substantial. Don't other 10 gallon batch brewers concern themselves with this expansion/contraction stuff?

Ken
 

Dan Listermann
Senior Member
Username: Listermann

Post Number: 3383
Registered: 03-2004
Posted From: 65.29.220.144
Posted on Monday, September 25, 2006 - 03:20 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

You also need to consider that your vessel will contract upon cooling as well.

Dan

--This space is STILL being left intentionally blank.-


 

Bob Wall
Intermediate Member
Username: Brewdudebob

Post Number: 275
Registered: 11-2004
Posted From: 24.99.80.253
Posted on Monday, September 25, 2006 - 04:00 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Methinks you doth worry too much. But then again, I am a seat of the pants type of brewer and have yet to measure things like strike water to grist ratio and my actual yield.

I am a 10 gallon all-grain brewer and have consistently had 70-75% efficiency* (as measured by Promash after knockout). When I mash in, I do it by feel. When I fly-sparge, I do it until the brew kettle "looks about full." (full enough for a vigorous boil).

*Recently I tried batch sparging for the first time and came out a little lighter than expected.
Give a man a beer and he'll waste an hour. Teach a man to brew and he'll waste a lifetime.
 

Brad Petit
Member
Username: Voodoobrew

Post Number: 140
Registered: 06-2005
Posted From: 69.22.8.78
Posted on Monday, September 25, 2006 - 10:30 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

You're a dangerous man, Bob!
 

Ken Anderson
Senior Member
Username: Ken75

Post Number: 1701
Registered: 11-2002
Posted From: 69.168.141.10
Posted on Monday, September 25, 2006 - 10:45 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

This batch was "no-chill", and I ferment in the boil kettle on the trub. Who? Me worry?
 

robert rulmyr
Advanced Member
Username: Wacobob

Post Number: 816
Registered: 02-2003
Posted From: 24.155.7.109
Posted on Monday, September 25, 2006 - 11:04 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Ditto Bob, I don't measure everything either.
 

Denny Conn
Senior Member
Username: Denny

Post Number: 5883
Registered: 01-2001
Posted From: 140.211.82.4
Posted on Monday, September 25, 2006 - 06:10 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

It's just a volume contraction. You won't actually have less wort. To prove it, you could weigh it both before and after "contraction".
LIfe begins at 60...1.060, that is.
 

Tom Gardner
Advanced Member
Username: Tom

Post Number: 851
Registered: 01-2001
Posted From: 162.119.232.100
Posted on Monday, September 25, 2006 - 06:39 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

And your sample cooled to room temperature, so the measured gravity won't change. Brew on, Tom
 

Ken Anderson
Senior Member
Username: Ken75

Post Number: 1703
Registered: 11-2002
Posted From: 69.168.141.10
Posted on Tuesday, September 26, 2006 - 07:18 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

i just pitched the yeast for this beer, and took a sample. It reads 14.9 Brix. It WAS 14.3 Brix when hot. This corresponds to 1.058 hot, and 1.061 cold. Three degrees, like we were talking. No time to take a volume measurement. I'll do that tonight. Interesting.
 

Richard Nye
Senior Member
Username: Yeasty_boy

Post Number: 1635
Registered: 01-2004
Posted From: 68.4.202.69
Posted on Tuesday, September 26, 2006 - 10:21 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Ken, if you take a couple of drops of the hot wort and check it with a refractometer, the sample cools to the temperature of the refractometer in a couple of nanoseconds. So you are measuring the SG of the cold wort. When the hot wort cools to room temperature it will still have the same SG you measured. In your cast is was a couple of points off. I suspect it was measurement error .
 

Andrew Pearce
Intermediate Member
Username: Live4beer

Post Number: 352
Registered: 02-2003
Posted From: 204.17.26.5
Posted on Wednesday, September 27, 2006 - 02:49 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Ken,
Mind sharing your Ness recipe? Which one did you use?
 

Doug W
Member
Username: Pivorat

Post Number: 175
Registered: 08-2004
Posted From: 66.188.1.232
Posted on Wednesday, September 27, 2006 - 07:33 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

ummmmmm, does your Refractometer have Automatic temp. Compensation like these? http://www.williamsbrewing.com/REFRACTOMETERS_C153.cfm or is it some other unit that does not have temp. compensation?
 

Ken Anderson
Senior Member
Username: Ken75

Post Number: 1704
Registered: 11-2002
Posted From: 69.168.141.10
Posted on Wednesday, September 27, 2006 - 10:41 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Richard, I used an eyedropper, and I agree the sample I measured was indeed cooled. Thanks for making me feel dumb.

This unit does have ATC though. I'm puzzled by the two different measurements. 14.3 and 14.9 are pretty far apart in that viewfinder. If anything, you'd think the hot measurement would more likely be high due to possible evaporation during the transfer of the drop of wort.

Also, I did the volume measurement, and it dropped only 1/4 gallon, not the half gallon which would be 4%.

Bottom line might be, some details ain't worth sweatin'.

Andrew, let me dig up that recipe.

Ken
 

Doug W
Member
Username: Pivorat

Post Number: 180
Registered: 08-2004
Posted From: 66.188.1.232
Posted on Thursday, September 28, 2006 - 12:55 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Not worth sweating, but this likely will explain it better than anything else.


http://www.veegee.com/pdf/Selecting%20The%20Proper%20Automatic%20Refractometer.p df#search=%22temperature%20effects%20on%20refractometer%22