Wort Separation Process Control SAQ Flashcards
(25 cards)
What is extract?
The mass of dissolved sugars present in a given volume of wort.
What are two common units of measurement used to determine the concentration of extract in wort?
- Specific Gravity
- ˚Plato
What is Specific Gravity?
The ratio of the mass of a given volume of a solution at 20˚C compared to the mass of the same volume of water at 20˚C.
What is ˚Plato?
A measure of the grams of extract in 100 g of wort (% w/w) at 20˚C.
What is a typical extract efficiency for a mash tun?
97%
What is a typical extract efficiency for a lauter tun?
98%
What is a typical extract efficiency for a mash filter?
101%
What factor affects the extraction efficiency in the mash process?
The fineness of the grind.
How does the grind size affect the husk fraction in a plansifter analysis?
A finer grind results in a smaller husk fraction.
What are two techniques to determine wort clarity?
- Visual assessment
- Measuring background haze as EBC units
What are typical haze values in EBC for mash tun, lauter tun, and mash filter?
- Mash Tun: < 5
- Lauter Tun: < 10
- Mash Filter: < 2
What are typical settleable solids values in mL/L for mash tun, lauter tun, and mash filter?
- Mash Tun: < 0.5
- Lauter Tun: < 1.0
- Mash Filter: < 0.2
How much extract is there in 800 hL of brew at 13.5 ˚Plato and SG 1.055?
11,372 kg extract
How do elevated levels of polyphenols affect beer quality?
They lead to impaired colloidal stability, forming visible haze and reducing shelf-life.
How do elevated levels of lipids affect beer quality?
They impair flavour stability and reduce shelf-life.
What are typical levels of polyphenols in wort for mash tun, lauter tun, and mash filter in mg/L?
- Mash Tun: 165
- Lauter Tun: 180
- Mash Filter: 195
What are typical levels of lipids in wort for mash tun, lauter tun, and mash filter in mg/L?
- Mash Tun: 2
- Lauter Tun: 18
- Mash Filter: 17
Which two variables of Darcy’s Law are likely to have changed if mash separation runs slower than normal?
- Decrease in grain bed permeability K
- Increase in viscosity μ
List the mash tun, lauter tun, and mash filter in order of increasing air entrainment.
- Mash Filter
- Lauter Tun
- Mash Tun
What can cause the gelation of β-glucans and proteins?
High shear forces during the mash process.
How does gelation affect lauter tun wort separation?
Impedes wort separation and increases DP across the grain bed.
What is the maximum speed for the agitator in the mash conversion vessel to avoid shear?
< 2.5 m/s
What is the maximum speed for the mash transfer pump to minimize mash damage?
< 1,000 rpm
What is the maximum velocity in the mash transfer pipework to avoid shear?
< 1.5 m/s
