Pre & Post Boil SG

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Pre & Post Boil SG

Unread postby Luis Coentrao » Fri Sep 19, 2014 8:21 pm

Hi Fellows,

What is your usual pre and post-boil SG gap?
As an example, I'm getting a difference of 5-7 SG points / 1.5Plato from a standard 90 minute boil time.
I measure the SG/Plato both with a hydrometer and refractometer, with pared results.
I've a BM20 model plus thermal jacket plus dome.

I was expecting a bigger difference between pre and post-boil gravities.

Same experience of you guys?
Luis Coentrao
 
Posts: 290
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Location: Porto, Portugal
Model: 50 litres (2015)

Re: Pre & Post Boil SG

Unread postby Eldoreth » Sun Sep 21, 2014 8:58 am

Isn't it depending on your adjuncts in the recipe and evaporation rates? I would think that my 90 minute boil would yield other results. Anyone more ideas on this?
Kristof
Lamontius.net
Eldoreth
 
Posts: 40
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Location: United Part-states of Belgium
Model: 50 litres

Re: Pre & Post Boil SG

Unread postby Luis Coentrao » Sun Sep 21, 2014 9:54 am

Hi,
Yes, clearly is directly related to evaporation/water loss.
I use Beersmith in wich I had set a boil off rate of 2.3L/h plus cool shrinkage 4% (standard) plus trub loss 2L. That's my numbers. However, Beersmith gives me a higher gap between pre and post-boil SG than I reach in practice. No adjuncts at all.
Last edited by Luis Coentrao on Mon Sep 22, 2014 11:50 am, edited 1 time in total.
Luis Coentrao
 
Posts: 290
Joined: Wed Mar 26, 2014 8:07 pm
Location: Porto, Portugal
Model: 50 litres (2015)

Re: Pre & Post Boil SG

Unread postby Eldoreth » Sun Sep 21, 2014 9:58 am

Have you checked that using the hood your boil-off rate is indeed 2.3l/h or more precisely in 90 minutes you loose 3,45L? If this is less, the density will be less also. If so I would extend the boil a bit longer to hit the numbers you want.
Kristof
Lamontius.net
Eldoreth
 
Posts: 40
Joined: Thu Aug 21, 2014 6:07 am
Location: United Part-states of Belgium
Model: 50 litres

Re: Pre & Post Boil SG

Unread postby Luis Coentrao » Sun Sep 21, 2014 3:28 pm

Yes,
With the hood on I have a great rolling boil. Water loss is 3.5L/90minutes. The only way to get my "real practice" SG in the Beersmith is to transfer cool shrinkage numbers (1L) to the trub loss :?
Luis Coentrao
 
Posts: 290
Joined: Wed Mar 26, 2014 8:07 pm
Location: Porto, Portugal
Model: 50 litres (2015)


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