Traditional fermentation systems

5.3.1 Open fermenters

Figures 5.4 (a), (b) and (c) show stages in the evolution of traditional fermentation vessels, which are principally associated with top-fermenting yeasts. Figure 5.5 shows a photograph of square fermenting vessels. The most primitive vessel (Fig. 5.4(a)) is a shallow open coopered wooden cask which receives no attemperation other than that provided by the room in which it is housed. The vessel is mounted on legs to allow air circulation and promote cooling. Cooling is further assisted by the shallow depth and relatively large surface area. The low aspect ratio and large surface favours rapid and efficient formation of a yeast head. Vessels of this design are small by modern brewing

(a)

Skimming parachute

Skimming parachute

C02 collection main

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