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Old 03-09-2013, 11:25 PM   #1
ForestGroveBrewer
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Im hoping someone can shed some light on an issue I am having with BeerSmith. The calculated post boil volume is almost a gallon high from what it should be. Also, does that affect the calculated post boil SG?

My AG setup is as follows.
10 Gal kettle
10 Gal MLT (round GOTT type cooler with SS false bottom)
Batch sparging
Brewing 5 Gal batches.

I know from the several batches if brewed I need 6.5 Gal of wort out of the MLT for 5Gal into the fermenter.

My last batch BeerSmith calculated as follows.
Preboil 6.53 Gal 1.047 SG
Post Boil 5.98 Gal 1.053

I end up with 5 Gal 1.053 SG

Where does the extra .98 get calculated? Is the calculated SG correct?

I hope I am asking the questions correctly. If not, Please let me know if you need any more info.

Thanks



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Old 03-09-2013, 11:35 PM   #2
cluckk
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That is trub loss--the amount of wort that will be left in the kettle with the trub when you rack to primary.

I do 5.5 gallon batches. My post-boil is around 6.5 and trub loss about a gallon.


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Old 03-09-2013, 11:50 PM   #3
cluckk
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As for the SG, all of the wort is the same gravity. Leaving some behind doesn't change it.
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Old 03-09-2013, 11:54 PM   #4
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To set it up, go into "settings" and add some volume to where your losses are, if that makes sense. Look at the boil off volume, and see if that's correct. Look at the deadspace, and make sure it's correct. You can do that until it's correct for your system.
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Old 03-10-2013, 12:26 AM   #5
ForestGroveBrewer
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Thanks.


Sounds like my procedure is off. I've been straining everything from the kettle to fermenter to get the 5 gal. Why leave some behind? Or am I misunderstanding what you mean by trub loss?

 
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Old 03-10-2013, 12:34 AM   #6
mjdonnelly68
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Quote:
Originally Posted by cluckk View Post
That is trub loss--the amount of wort that will be left in the kettle with the trub when you rack to primary.

I do 5.5 gallon batches. My post-boil is around 6.5 and trub loss about a gallon.
Wow - If your post boil is 6.5 gallons, what is your boil volume for a 90 minute boil?
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Old 03-10-2013, 01:21 AM   #7
cluckk
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Quote:
Originally Posted by mjdonnelly68

Wow - If your post boil is 6.5 gallons, what is your boil volume for a 90 minute boil?
I usually do 60's. My preboil volume is about 7.8 gallons or so.

If you are shooting for 5 gallons at x gravity and end up putting 5 gallons at x gravity into the fermenter why worry about leaving a bit extra in the kettle?
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Old 03-10-2013, 01:51 AM   #8
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I've been working on volumes myself, seems I'm always low going into the fermenter. On the last batch I found my tun dead space to be .75 not .5. Today I found my boil off to be closer to 1.5G, not the 1 that was entered, brewing again in 2 weeks I guess I'll see how much closer I am now. It's a process, and I learn something every brew day. Now if I could just figure out why my mash temp is always low.

 
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Old 03-10-2013, 02:35 AM   #9
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The tun dead space has to do more with adjusting the liquid to mash ratio.

If you have 6.5 gallons at the end of boil and get only 5 gallons in the fermentor, it should be fairly obvious where the issue is. There's a gallon and a half of trub, hops, and wort somewhere. It's either in the kettle or in your tubing or on the floor.

Either way, trub loss is the only way to account for process losses in Beersmith.

OTOH; if your kettle full volume and gravity match BS, you won't get help by changing any mash equipment profiles. The answer has to be in the kettle.

You said your kettle post boil balling matches BS. If your boil off volume is not 100% true to life and/or your kettle full gravity is not identical to BS, you will need to adjust some mash parameters *edit- ...or boil off rate.

If your kettle full (pre-boil) gravity and your fermenter ful( post boil gravity match BS, the issue is with the trub loss value.

 
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Old 03-10-2013, 01:29 PM   #10
mjdonnelly68
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Quote:
Originally Posted by cluckk View Post
I usually do 60's. My preboil volume is about 7.8 gallons or so.

If you are shooting for 5 gallons at x gravity and end up putting 5 gallons at x gravity into the fermenter why worry about leaving a bit extra in the kettle?
Agreed - better to have it and not need it than need it and not have it.


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