Duotank is based on a unique concept where the beer is stored in airtight bags in pressurised tanks, known as the Bag-In-Tank principle. This system was originally developed for the distribution of pilsner beer produced by the major Dutch brands, and which is stored in chilled cellars under pubs and bars. Over the course of the years, however, Duotank has been developing the concept, and it can now be used in a wide variety of applications.
The specific advantages of the Duotank concept have led to it being increasingly adopted by microbreweries and brewpubs. This popularity is partly due to the fact that the beer retains its flavour longer after being connected to the beer taps, (many major breweries guarantee up to 12 weeks!), making it ideal for the specialty beers that often have somewhat lower turnover. This is because no extra CO2 needs to be added to the beer, and the beer is kept at a constant temperature and pressure; these factors significantly help preserve the quality of the beer and increase customers’ enjoyment of the flavour.
Sharply priced and easy cleaning:
The interiors of the tanks do not need to be hygienically polished, so they are much less expensive. And because the beer only comes into contact with the recyclable bags, it is much simpler and cheaper to clean the tank. The attached video shows the operations needed to exchange a bag in a chilled cellar beer tank. As Leonardo da Vinci said: “simplicity is the ultimate sophistication.”
Storage, transport and distribution:
The primary application of the Bag-In-Tank system is for the storage, transport and distribution of beer. This might be transport from the brewery to the bottling plant, or even directly to the bar or pub, where beer can be drawn directly from the tank.
The tanks can, of course, also be used as storage tanks. Setting the required temperature is very easy. Mobile versions of the tanks are available, allowing them to be used for transportation. Such tanks can also be stored in another area when not in use.
An increasing number of microbreweries and brewpubs also use the air-tight bags for lagering beer with limited post-fermentation. The beer pressure required can be simply regulated by adjusting the air pressure in the tank on the outside of the bag, without any unnecessary additional CO2 having to be added to the beer. Because beer takes a long time to mature, the tank must be chilled for a prolonged period. Duotank tanks can be fitted with an insulated jacket and cooling coil. This means that beer can mature outside the cold room, eliminating the need for a refrigerator