post boil gravity

[matc]

Turns out I might have an issue with my volumes with beersmith. Under the equipment profile page, I verified the box "adjust mash volume for deadspace" was checked and it is. However, under the volume tab of my ipa recipe, the volumes for the mash and strike water does not add up to the preboil gravity. I think beersmith is not compensating for 1L of deadspace. What do you think ?

If my total water needed is 26L, I will lose 4L for grain absorption and 1L for deadspace which gives 21L of pre boil volume, not 22L as stated by beersmith !

 

[Derek1985]

Turns out I might have an issue with my volumes with beersmith. Under the equipment profile page, I verified the box "adjust mash volume for deadspace" was checked and it is. However, under the volume tab of my ipa recipe, the volumes for the mash and strike water does not add up to the preboil gravity. I think beersmith is not compensating for 1L of deadspace. What do you think ?

If my total water needed is 26L, I will lose 4L for grain absorption and 1L for deadspace which gives 21L of pre boil volume, not 22L as stated by beersmith !

Wish I could help more. I don't use BeerSmith and am not familiar with it's inner workings like I am with my own spreadsheet.

 

[chickypad]

Do you have the "adjust volume for deadspace" checked on the mash page?

 

[wilserbrewer]

pre boil sg was 1.051 (temp was 46 but I corrected it with a chart)

.

I assume your preboil temp was 146f, and not 46c or f.

Most prefer to cooling the hydro sample over using the correction chart, I'm not sure the chart is reliable for such a large correction.

As said, either your hydro numbers, and or volumes are flawed, or you spilled a lot of wort / sugar.

 

[55x11]

Turns out I might have an issue with my volumes with beersmith. Under the equipment profile page, I verified the box "adjust mash volume for deadspace" was checked and it is. However, under the volume tab of my ipa recipe, the volumes for the mash and strike water does not add up to the preboil gravity. I think beersmith is not compensating for 1L of deadspace. What do you think ?

If my total water needed is 26L, I will lose 4L for grain absorption and 1L for deadspace which gives 21L of pre boil volume, not 22L as stated by beersmith !

To explain original post, you are looking at ~16% difference. But your explanation of volume correction is about 0.5% difference.

Bottom line - you were either wrong in the measurements of gravity OR measurements of volumes. Or both.

 

[matc]

yes I know, I don't know what happened with my og but for the moment, I'm trying to understand why Beersmith is short on 1 L after the mash. And yes I checked the box "adjust mash volume for deadspace"

 

[EarthwormJim]

There is a 1l loss for cooling shrinkage in the center section. It is probably that. Beersmith is probably assuming pre boil is measured hot, post boil is measured after cooling.

 

[chickypad]

It looks like you've got things set so that all your measurements are being rounded to the nearest liter. For example, the 4% cooling should be .68 liter, it's marked as 1. I don't know what grain absorption is supposed to be in liter per kg, but I highly doubt it comes out to exactly 4 L on the dot. There must be a setting in options to have it go out more decimal places - I just tried changing the units to metric in my BS program and it goes out to .01 liter. Not sure if this is your issue but given that the cooling itself is rounded up about a third of a liter it might be.

 

[chickypad]

Running some numbers I think this could be your issue. Look at the differences when rounding to a whole liter (grain absorption may not be accurate but illustrates the issue of rounding). If you add up the numbers in first column they match, in the second column you're now a liter off.

................................Actual .............Rounded

Mash water ................ 11 .................11
Grain absorption ...........3.55 ..............4
Avail from mash ...........7.45 ...............7
Deadspace ....................1 ..................1
Sparge vol .................15.23...............15
Boil volume ................21.68 ..............22
boil off .........................5 ..................5
cooling ........................0.68 ..............1
trub loss .......................2..................2
batch size ....................14.................14

Edit: sorry trying to format to read better and corrected some numbers

 

[doug293cz]

It looks like you've got things set so that all your measurements are being rounded to the nearest liter. For example, the 4% cooling should be .68 liter, it's marked as 1. I don't know what grain absorption is supposed to be in liter per kg, but I highly doubt it comes out to exactly 4 L on the dot. There must be a setting in options to have it go out more decimal places - I just tried changing the units to metric in my BS program and it goes out to .01 liter. Not sure if this is your issue but given that the cooling itself is rounded up about a third of a liter it might be.

Running some numbers I think this could be your issue. Look at the differences when rounding to a whole liter (grain absorption may not be accurate but illustrates the issue of rounding). If you add up the numbers in first column they match, in the second column you're now a liter off.

................................Actual .............Rounded

Mash water ................ 11 .................11
Grain absorption ...........3.55 ..............4
Avail from mash ...........7.45 ...............7
Deadspace ....................1 ..................1
Sparge vol .................15.23...............15
Boil volume ................21.68 ..............22
boil off .........................5 ..................5
cooling ........................0.68 ..............1
trub loss .......................2..................2
batch size ....................14.................14

Edit: sorry trying to format to read better and corrected some numbers

I think you may be on to something with the rounding errors, and reference temps for volume measurements. I was looking thru the Beersmith on-line help yesterday to see if there was any explanation of assumed temps for pre-boil or post-boil volume measurements, but couldn't find anything. Does anyone know for sure what temps Beersmith assumes?

Number of decimal places shown for volumes, weights, etc. can be set on the Options => Units menu, which is the same place you set what units you want to use (e.g. pounds or kilograms.)

Note on getting things that require fixed spacing to line up (like columns.) If you use the "code" html tags, around the text where you want to maintain fixed spacing, then you won't get proportional fonts and collapse of consecutive spaces. As a result, you get this:

Ingredients:
------------
Amt         Name                                      Type    %/IBU
4.08 kg     Pale Malt (2 Row) US (2.0 SRM)            Grain   83.7 %
0.45 kg     Caramel/Crystal Malt - 60L (60.0 SRM)     Grain   9.3 %
0.23 kg     Victory Malt (25.0 SRM)                   Grain   4.7 %
0.11 kg     Caramel/Crystal Malt -120L (120.0 SRM)    Grain   2.3 %
0.25 oz     Amarillo Gold [9.50 %] - First Wort 60.0  Hop     8.9 IBUs
0.53 oz     Amarillo Gold [9.50 %] - Boil 20.0 min    Hop     10.5 IBUs
0.53 oz     Amarillo Gold [9.50 %] - Boil 10.0 min    Hop     6.3 IBUs
0.74 oz     Amarillo Gold [9.50 %] - Boil 5.0 min     Hop     4.8 IBUs
0.74 oz     Amarillo Gold [9.50 %] - Steep/Whirlpool  Hop     4.4 IBUs
1.0 pkg     American Ale II (Wyeast Labs #1272)       Yeast   -

Instead of this:

Ingredients:
------------
Amt Name Type %/IBU
4.08 kg Pale Malt (2 Row) US (2.0 SRM) Grain 83.7 %
0.45 kg Caramel/Crystal Malt - 60L (60.0 SRM) Grain 9.3 %
0.23 kg Victory Malt (25.0 SRM) Grain 4.7 %
0.11 kg Caramel/Crystal Malt -120L (120.0 SRM) Grain 2.3 %
0.25 oz Amarillo Gold [9.50 %] - First Wort 60.0 Hop 8.9 IBUs
0.53 oz Amarillo Gold [9.50 %] - Boil 20.0 min Hop 10.5 IBUs
0.53 oz Amarillo Gold [9.50 %] - Boil 10.0 min Hop 6.3 IBUs
0.74 oz Amarillo Gold [9.50 %] - Boil 5.0 min Hop 4.8 IBUs
0.74 oz Amarillo Gold [9.50 %] - Steep/Whirlpool Hop 4.4 IBUs
1.0 pkg American Ale II (Wyeast Labs #1272) Yeast -​

This is what code tags look like in your reply edit window:



You can insert "code" tags with a button at the top of the reply window:



Brew on

 

[matc]

all right I'll check my decimals, I don't want beersmith to round up my numbers. thanks guys