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How to calculate the diameter of beer lauter tank or Mash/Lauter tun

If we want to design a 1000L brewing system and brew a beer with 15 Plato

Roughly by formula, the malt weight is (15% x 1000kg) / (80% x 90%) ≈ 210kg

I. By unit load of false bottom

Dry malt milling, 140kg – 175kg/m2, let’s set 160kg/m2

So the false bottom S = 210/160=1.312m2

By formula: 1.312m2 = πR2， we can get the R = 0.646m

Then we can get the inner diameter of lauter tank is 1300mm

II. By grain depth

Considering the filter effect, generally the spent grain depth is 0.3m – 0.4m, let’s set 0.35m

If 210kg malt, the final spent grain volume is around 0.38m3

by formula: 0.38m3 = πR2 x 0.35m,  we can get the R = 0.588m

Then we can get the inner diameter of mash/lauter tun is 1200mm

From the above different ways of calculation, we get 2 numbers.  But it’s very close for home brewing

So about diameter of beer lauter tank, we need consider other factors

The beers; Malt type; Sugar Yield; Extract Efficiency; False bottom type…

Here we can exchange ideas for craft beer, also for tanks.

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Best Regards

Eddie from Jinan Rainbow Machinery

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