Scaling of recipes

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Scaling of recipes

Unread postby Skippa » Thu Mar 06, 2014 12:07 am

Has anyone else noticed the BM recipes on their website? Sure most have, but I can't work out why the scaling up of the same recipe from 20l to 50l to 500l etc doesn't scale numerically. For example in the Bohemian Lager

For to 50l
Code: Select all
55 l of brewing water to start with plus sparging water
8.0 kg Bohemian Lager malt
2.0 kg Carahell
1.0 kg Wheat malt
50 g Hallerthauer hops (8 % alpha)
12 g Cascade hops (6 % alpha)
1 packet Saflager S-23 yeast

For the 500l
Code: Select all
550 l of brewing water to start with plus sparging water
80.0 kg Bohemian Lager malt
15.0 kg Carahell
5.0 kg Wheat malt
500 g Hallerthauer hops (8 % alpha)
120 g Cascade hops (6 % alpha)
3 packets Saflager S-23 yeast

While there is only a change in the Carahell, the other recipes also have small inconsistencies. Any thoughts to why?
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RE: Scaling of recipes

Unread postby gert » Thu Mar 06, 2014 10:24 pm

Strange indeed, especially this wheat malt. Maybe some chemical reactions will be different? No idea.

For some recipes the volume of the malt pipe can be a problem. I read on de Speidel website:
malt pipe 20l = 6 kg - 200l = 42 kg (and not 60 kg...)
malt pipe 50l = 13 - 500 l = 120 kg (should be 130)

So if you make a beer with 6 kg malt on the 20l you just can't make the same on the 200l . Very strange too!
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RE: Scaling of recipes

Unread postby Dicko » Fri Mar 07, 2014 5:33 am

Whether you are using a BM or any other brew rig, when you are copying a recipe you really need to know the percentage amount of the grain which is the most accurate or at the least you need to know the OG at the end of the boil and the volume at that point along with the efficiency.
Gert could have the answer with those varying volumes, or Speidel could have made a misprint.
The worst thing that can happen if I die is that my wife will sell all my brewing equipment for what I told her I paid for it
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RE: Scaling of recipes

Unread postby ChilliMayne » Fri Mar 07, 2014 9:46 am

the quantities from the 20L recipe i just scale up by 2.4 to give me my quantities for the 50L brew.
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Re: Scaling of recipes

Unread postby Cervantes » Sat Mar 29, 2014 11:30 pm

What Dicko said.

Also have you tried scaling up in Beersmith or similar and comparing the results?

My guess would be a typo, but it is just a guess.

Cheers :cheers:
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