Controlling the Lauter Tun Flashcards
(20 cards)
What is the purpose of the underlet capability in lauter tun operation?
To flood and just submerge the false floor with hot water before receiving the mash
This is done by introducing hot water by reverse flow through the outlets or from the overhead sparge ring.
What factors influence the operation of the rakes in the lauter tun?
DP and wort clarity
DP stands for differential pressure.
What is the purpose of the metal vent pipe in the outlet pipework?
To relieve vacuum and prevent air from being drawn into the wort
Pulling air into the wort is considered very undesirable.
What should be done if maximum DP is reached during wort collection?
Stop wort collection and carry out a deep bed rake
This allows fines to pass through the false floor.
What is the total cycle time for a typical lauter tun operation?
144 minutes
This cycle time allows for 10 brews per day.
How long does the underlet operation take in the lauter tun?
3 minutes
What is the duration for filling the lauter tun with mash?
10 minutes
How long is the first worts recirculation?
6 minutes
What is the duration for strong worts collection?
30 minutes
What is the optional programmed deep bed rake duration?
10 minutes
How long does sparged worts collection take?
65 minutes
What is the time required for bed drain-down?
5 minutes
What is the duration for spent grain removal and under-floor jetting?
15 minutes
Fill in the blank: The strong worts are high in gravity and viscosity, so they need to be run relatively slowly to avoid too high a _______.
DP
What initiates the overhead sparge in continuous sparging?
When the supernatant wort level has dropped to within 25-50 mm of the grain bed surface
What happens during batch sparging after most of the strong worts have been collected?
Underlet a large volume of water beneath the grain bed
This helps unblock the slots in the false floor.
What is done to maintain the supernatant liquid level during wort collection?
Sparge flow matches wort flow
What is the typical rotation speed required for graining out compared to lautering speed?
Graining out: roughly 7 rpm; Lautering: around 0.1 rpm
What is the purpose of the rotating rakes or plough bar during spent grain removal?
To push the spent grain towards the discharge outlet
What is the function of under-floor high pressure hot water jets during spent grain removal?
To suspend any residual under-floor solids for flushing down the wort outlet pipework
