Two tanks yeast propagation unit in brewery
In nano brewery, some brewmasters buy dry yeast directly and activate it in a small yeast tank (we can call it yeast brink tank or yeast dosing tank). In some bigger brewery equipment, the brewmasters chose to propagate the yeast to meet the bigger requirement.
Two tanks yeast propagation is a traditional yeast propagation method for microbrewery. In this method, ventilation in beginning stage is necessary. Its expansion is not high, normally, 3.5-4times. The characteristic of this method is as below:
1.Purebred yeast is necessary in every propagation.
2.Drain system and sterilize system completely before next propagation process .
Configuration of two tanks yeast propagation unit Pre propagation tank(small tank), main propagation tank, recycle pump, yeast transfer, yeast adding, CIP in and CIP out. Except these, pipe, control are also included.
1.Fill wort to small propagation tank-->Sterilize wort-->Cool tank to inoculation temperature-->Adding yeast-->Yeast propagation
2.Fill wort to main propagation tank-->Sterilize wort-->Cool tank to inoculation temperature-->Mixing yeast in small tank to main tank-->Yeast propagation-->Connect pipe from main propagation tank to fermenter-->Clean and sterilize pipe-->Yeast enters into fermenter.
Two tanks propagation method is an independent and closed system, no contamination occurs by sterilizing wort.
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