Wort Separation

Question 1

What layer forms above grain bed in lauter?

Answer 1

Supernatant liquid layer

Question 2

What is unique to mash tun grain beds?

Answer 2

Suspended bed

Question 3

What determines mash wort strength?

Answer 3

Water:grist ratio, extract in raw materials used, efficiency of mash conversion

Question 4

Why is spent grain beneficial to animals?

Answer 4

They can digest cellulose and it is relatively protein rich (25-30%)

Question 5

Four main uses of spent grain

Answer 5

animal feed, burning, compost, biofuels

Question 6

What is Darcy’s Law?

Answer 6

Flow rate Q = (K x DP x A) / (u x L)

Question 7

What factors affect wort viscosity?

Answer 7

Mash thickness, Beta glucan, arabinoxylan, temperature

Question 8

What gravity does a mash tun thickness of 2.5 typically produce?

Answer 8

1.090 wort

Question 9

What viscosity level of wort is usually in the mash tun?

Answer 9

1.83 cP (1.090 at 65 C)

Question 10

What viscosity level of wort is usually in the lauter tun?

Answer 10

1.28 cP (1.075 at 76 C)

Question 11

What are the 2 factors of grain bed permeability?

Answer 11

Porosity and mean particle diameter of grist

Question 12

How do you convert flow rate of m^3/s to hL/hr?

Answer 12

Multiply by 3600 (s to hr) and multiple by 10 (m^3 to hL)

Question 13

What are later rakes attached to?

Answer 13

The rig

Question 14

Minimum spacing of lauter rakes?

Answer 14

160 mm but can be offset on each arm

Question 15

How mush faster is sparked worts collection compared to first worts collection in a lauter tun?

Answer 15

2.5-3x flow rate

Question 16

How long is a typical lauter tun cycle?

Answer 16

144 min

Question 17

What is a mash tun typical cycle time?

Answer 17

288 min

Question 18

What is a mash filter max inlet pressure?

Answer 18

0.5 bar

Question 19

What is a typical mash filter cycle time?

Answer 19

110 min

Question 20

What does specific gravity measure?

Answer 20

Ratio of mass of solution at 20 C compared to mass of water at 20 C

Question 21

What does plato measure?

Answer 21

Grams of extract per 100 g solution (%w/w)

Question 22

What is a Litre degree?

Answer 22

IoB extract measurement:
Litre Degree = volume x degrees gravity (1.020 = 20)

Question 23

How does EBC express extract?

Answer 23

%w/w

Question 24

How to convert from extract %w/w to L degrees/kg

Answer 24

1 %w/w = 3.86 L degrees/kg

Question 25

How to calculate Kg of extract in wort

Answer 25

Kg extract = hL x Plato x density

Question 26

What is the density of water at 20 C

Answer 26

0.9982 kg/L

Question 27

What must be done to Specific gravity of recovered wort when calculating extract amount?

Answer 27

Convert based on density of water at 20 C Multiply by 0.9982

Question 28

How to calculate Plato from SG?

Answer 28

Plato = (190.74 x SG^3) - (800.47 x SG^2) + (1286.4 x SG) - 676.67

Question 29

How can spent grain be analyzed?

Answer 29

Hand analysis, Total available extract in grain (mashed with enzymes, should be less than 7% w/w), Soluble extract in grain (should be <4% w/w)

Question 30

What is inconsistent dispersion of sparge water across the grain bed called?

Answer 30

Preferential sparge flow

Question 31

What are typical wort lipid levels from mash tun, lauter tun and mash filter?

Answer 31

2, 18 and 17 mg/L, respectively

Question 32

What are typical wort polyphenol levels from mash tun, lauter tun and mash filter?

Answer 32

165, 180 and 195, respectively

Question 33

What are typical wort haze levels from mash tun, lauter tun and mash filter?

Answer 33

<5, <10 and <2 degrees EBC, respectively