How many liters beer could be brewed with GrainBrew brewery equipment

Recently, many customers asked if less beer could be brewed with our beer brewing equipment. Let’s talk about it.
 
Normally, to ensure a good lautering process, the grainbed thickness around 30-40cm will be fine.
And minimum should not below 25cm, maximum should not over 45mm. Our diameter of lauter tun is also designed based on it.


 
For example, if a 1000L lauter tun with the diameter of 1460mm, minus 160mm of insulation layer, then the inner diameter is 1300mm.
Let’s do a rough calculating:
 
At first, to know the smallest capacity of beer which will be made with the equipment, we should know the smallest capacity of grain which could be added.
 
Based on the numbers above, the volume of spent grain should be V=πr2*h, so smallest volume could be around 3.14x0.65mx0.65mx0.25m=0.33m3.
Usually, the dry malt after milled and mixing with water, the grain volume will expand to 1.65-1.8 times.
 
That is to say, the original volume of grain will be about 0.33/1.8=0.183m3.
So we could make a simple estimate that to ensure a good lautering process, at least 183kg grain should be added.
 
For the beer volume, that depends on your grain-water ratio. Such as if the ratio is 1:3, then you could add around 549L water.
If the ratio is 1:4, around 732L water will be requested.

Hope it make sense.
More discussion will be really welcomed by us.

Edit by Jane
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