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Stillages are mainly used to transport goods without the need to load and unload the product being carried, which saves time and decreases the chance of damage. An example is the use of stillages in the glass industry, where they are shaped like an upright "A"; the glass leans inward and is strapped to the stillage ready for transport.
Unlike kegs, which can be simply stood upright on the floor, casks are used lying on their sides. This allows the beer to run from the tap under gravity, with room in the "belly" of the cask below the outlet for the finings to collect. The shive with the spile will then be the highest point on the cask. As the beer clears (see finings), the inside of the cask becomes coated with sediment. It is important that the stillage holds the cask absolutely still with no rocking or shaking, otherwise the sediment will be shaken into suspension and the beer will be cloudy.
A stillage need not be complicated - anything that will support a cask (preferably on three points to avoid any wobbling) will do. At temporary events, sturdy tables or frames made of scaffolding and planks might be used, with the casks placed on wooden wedges (two at the front, one at the back). At the other end of the scale, many pub cellars use specially-made steel racking, often with two rows of casks one above the other. Some pubs have brick or stone stillages, sometimes quite ancient, built into the wall of the cellar.
As the cask empties, it needs to be gently tilted to obtain the last of the beer. With wooden wedges, moving the rear wedge forward will achieve this; purpose-built metal units often have springs incorporated that automatically tilt the cask as it becomes lighter. This requires less effort from bar staff, and also helps beer quality - the lift is so smooth and gradual that there is no danger of stirring up the lees and making the beer cloudy.
- "What Is A Stillage?". JS Burgess Engineering Ltd. JS Burgess Engineering. Retrieved 12 August 2015.