Yeast Propagation system
Yeast is very important to brewing a good beer with good beer equipment. Well how is the yeast be propagated?
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For the 10-12 Plato beer, normally we add about 0.4-0.6%, 7-9 Plato beer, add 0.3-0.4%, 13-15% Plato beer, add 0.5-0.7%. So according to this, we can calculate the quantity needed.
When propagate the yeast, we will use the Carlsberg Flask.
The Carlsberg Flask is a great tool because it is a self-contained sterile propagation system. This means the yeast can leave the lab and still stay sterile.
Here’s how it works:
The flask is filled to 80% capacity with wort, which is then sterilized using a burner or autoclave.
Steam is allowed to escape the flask during this process.
The wort is cooled by refrigerating the flask.
The wort is oxygenated by injecting sterile air into the flask using an aeration lance.
Next, the yeast culture is injected into the flask using a syringe.
The yeast begins to propagate. CO2 is allowed to vent during this phase.
When it is ready, the new yeast culture is used to inoculate an even larger propagation vessel containing 30 hectolitres of sterilized wort. Aeration and yeast growth continues in the 30 hl self-contained propagator for three 3 days, which is the time required to achieve sufficient yeast mass to pitch a full-sized batch of wort.
Yeast propagation station is a facility where a pure culture of brewer´s yeast is propagated in sterile wort, usually continuously under aseptic conditions. A brewery which owns a Yeast propagation station eliminates the possibility of purchasing infection with yeast and is independent from competitors, by which it would be otherwise sourced.
Yeast propagation station consists of the following :
Sterilizer of wort
Propagator
Pipe connection, and wort aeration pump
Electrics, controls and regulation
Supporting frame
CIP station
Sterilizer of wort
The pressure stainless steel vessel is equipped with insulated duplicator for heating and cooling.
For heating is necessary saturated steam (pressure 2.0 bars), to cool sterile wort is first used water from well and later glycol – 4 ° C. The container includes the necessary accessories. The tangential inlet with nozzle connected to a circulation pump what also allows to use container as a whirlpool for adjusted wort from sludge and other mechanical impurities, whose presence disrupts the process of propagation in yeast propagator.
The sterilization tank is sealed, right? So it can keep pressure like fermenters, right? So if boiling and pressure is 2.0 bars then we can reach 121C and sterilize wort.
Propagator
Insulated pressure stainless steel vessel with jacketed duplicator for cooling, including accessories.
The tanks shall have the cooling and heating. Heating is used to sterilize and the cooling is used to cool. So they are all necessary for a beer brewing system.
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