Beer Keg Dispensing Backpack
- Structure and Function of the beer keg dispenser backpack
The keg is a cylindrical stainless steel drum. Modern kegs are often rubber-coated to protect the container from damage.
- The jacket also insulates the keg; the contents remain cool for longer, but a longer cooling period is needed to bring them to the desired temperature.
The proprietary KeyKeg backpack connection variant is used exclusively for disposable kegs from Lightweight Containers BV.
- This tapping head is placed on top of the fitting and then turned by 60° for fixing. The keg is then tapped by pressing down on the lever.
- On the upper side in the middle there is a valve, the so-called keg head.
- A suitable tapping head can be attached to this, which supplies propellant gas (carbon dioxide, in certain cases also nitrogen) from an external container and discharges the contents to the tapping system.
- The tapping head closes the keg tightly, so that when the hose lines and backpack Equipment in the correct condition, the drum can be tapped and transported into the glass almost sterile.
The propellant gas creates an overpressure in the keg and the contents are pushed out through a pipe inside the keg when the tap is opened. If the backpack dispensing tapping head is removed, the valve closes the keg airtight, allowing further storage of the contents and preventing the residues from drying out. The overpressure inside the keg is maintained and foaming of the contents is reduced.
The four connection systems mainly used by German brewers have been identified by different types (letters) to better distinguish them.
Flat tapping head (type A) and combination tapping head (type M)
At first glance, these two tapping heads hardly look different. They are both pushed sideways onto the valve and differ only in the centre tappet, which opens the valve by pressing into the barrel. The flat tapping head (type A) is a kind of "bell", while the combi tapping head (type M) has only a small tap pipe and is surrounded by a perforated rim.
- Although the two systems are mounted in the same way, they are not compatible with each other and cannot be exchanged crosswise.
- Basket tapping head (type S) and draft tapping head (type D)
These two tapping heads also look very similar, but in contrast to the ones mentioned above they are "screwed" onto the barrel.
- With the basket tapping head (type S), the centre ram is longer than in the draft tapping head (type D) and can be recognised by the lateral V cut-outs.
Beer keg dispensing Backpack
Some breweries mark their barrels with coloured bands around the barrel so that you can see what is in it.
For example, Karlsberg is marked blue-black and Bitburger green. But the most common way to mark a keg barrel is the so-called fitting lid.
This lid is made of flexible or hard plastic and is pressed onto the fitting. The desired data can now be affixed to it using stickers. Advantage: You can fill the beer backpack barrels again and again with other kinds of beer.
Cleaning and filling
The valve system allows the beverage manufacturer to carry out the filling fully automatically.
After external cleaning, the keg is rinsed several times and then sterilized with hot steam to kill any germs harmful to beer. The tightness is then checked.
In order to cool the beer backpack keg from the steam treatment and prevent foaming of the contents during filling, it is pressurised with carbon dioxide and finally filled.
Keg Dispenser Backpack
In Germany, design forms were essentially determined by the standards DIN 6647-1 and DIN 6647-2, called "Cylindrical beverage and basic material containers, nominal volume up to 50 l" (part 1 to 3 bar and part 2 to 7 bar) in the latest version of 1998. In addition, there is DIN 3542 "Drum couplings and drum connection parts, connection dimensions" as well as DIN 32677 "Line connection parts for beer dispensing systems, connection dimensions" for the taps.
- Contents Size according to DIN 6647-1/-2
(height × diameter) Size of a Euro keg
(height × diameter)
- 50 l (13.21 gal) 600 mm × 363 mm 532 mm × 408 mm
- 30 l (7,93 gal) 400 mm × 363 mm 365 mm × 408 mm
- 25 l (6.61 gal) - 395 mm × 327 mm
- 20 l (5.29 gal) 310 mm × 363 mm 395 mm × 216 mm
- More and more Euro Kegs are being used in Germany to replace the DIN design. While DIN kegs are measured in 50, 30 and 20 litres, Euro kegs have 50, 30, 25 and 20 litres - whereby 25 litres is the next smaller delivery size in addition to the 50-litre drum size.
- The Euro kegs are lower and thicker with the same contents - a stainless steel kegs of 50 litres is designed for DIN with 600 mm height and 381 mm diameter, for Euro kegs with 532 mm height and 408 mm diameter.
Litre US.liq.gall Designation Type (height × diameter)
58.8 l 15.5 gall Full Keg / Half Barrel 23.3 inch × 16.1 - 17.1 inch
≈ 592 mm × 409 - 434 mm
- 29,3 l 7,75 gall Pony Keg / Quarter Barrel
- 19.8 l 5.32 gal Sixth Barrel
- 50 l 13,2 gal Import Keg (Euro Barrel)
- 25 l 6,6 gal Euro Half Barrel
In the USA, the size of 15.5 US gallons (full keg) is the most common, more commonly referred to as "half barrels", and the next smaller size is a quarter barrel with 7.75 US gallons.
- The most common European size of 50 litres is traded as an "Import Keg" or "Euro Barrel".
- The data for gallons are "US liquid gallon" of 3.7854 litres and not the Imperial Gallon of 4.546 litres - the European 50-litre beer Dispenser backpack barrel corresponds almost exactly to a content of 11 Imperial Gallons (this 50-l or 11-litre Imperial Gall barrel is the most common barrel size in Great Britain).