Jan 19, 2024 · Beer Fermentation Tank Sizes. Beer fermentation tanks cover a wide range of sizes from a few barrels to massive volumes over 1000 barrels. Some typical fermenter capacities include: Pilot Systems: 1-3 BBL; Microbreweries: 3-7 BBL, 7-30 BBL; Pub Breweries: 15-30 BBL; Production Breweries: 30-300 BBL, 600-800 BBL, 1000+ BBL