Lauter tun


Lauter tun

A lauter tun is the traditional vessel used for separation of the extracted wort. While the basic principle of its operation has remained the same since its first use, technological advances have led to better designed lauter tuns capable of quicker and more complete extraction of the sugars from the grain.

The false bottom in a lauter tun has thin (0.7 to 1.1 mm) slits to hold back the solids and allow liquids to pass through. The solids, not the false bottom, form a filtration medium and hold back small solids, allowing the otherwise cloudy mash to run out of the lauter tun as a clear liquid. The false bottom of a lauter tun is today made of wedge wire, which can provide a free-flow surface of up to 12% of the bottom of the tun.

The run off tubes should be evenly distributed across the bottom, with one tube servicing about 1 m² of area. Typically these tubes have a wide, shallow cone around them to prevent drastic forces from compacting the grain directly above the outlet. In the past the run-off tubes flowed through swan-neck valves into a wort collection grant. While visually stunning, this system led to a lot of oxygen uptake. Such a system has mostly been replaced either by a central wort-collection vessel or the arrangement of outlet ports into concentric zones, with each zone having a ring-shaped collection pipe. Brewhouses in plain public view, particularly those in brewpubs, often maintain the swan-neck valves and grant for their visual effect.

A quality lauter tun has rotating rake arms with a central drive unit. Depending on the size of the lauter tun, there can be between two and six rake arms. Cutting blades hang from these arms. The blade is usually wavy and has a plough-like foot. Each blade has its own path around the tun and the whole rake assembly can be raised and lowered. Attached to each of these arms is a flap which can be raised and lowered for pushing the spent grains out of the tun. The brewer, or better yet an automated system, can raise and lower the rake arms depending on the turbidity (cloudiness) of the run-off, and the tightness of the grain bed, as measured by the pressure difference between the top and bottom of the grain bed.

There must be a system for introducing sparge water into the lauter tun. Most systems have a ring of spray heads that insure an even and gentle introduction of the sparge water. The watering system should not beat down on the grain bed and form a channel.

Large breweries have self-closing inlets on the bottom of the tun through which the mash is transferred to the lauter tun, and one outlet, also on the bottom of the tun, into which the spent grains fall after lautering is complete. Craft breweries often have manways on the side of the mash tun for spent grain removal, which then must be helped along to a large extent by the brewer.

Some small breweries use a combination mash/lauter tun, in which the rake system cannot be implemented because the mixing mechanism for mashing is of higher importance. The stirring blades can be used as an ersatz rake, but typically they cannot be moved up and down, and would disturb the bed too much were they used deep in the grain bed.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • lauter tun — noun see lauter tub …   Useful english dictionary

  • Tun — may refer to:*An antiquated British measurement of liquid volume, approximately 252 gallons or 954 litres **A cask with a volume of one tun, especially of wine. *A large sea snail of the family Tonnidae. *An insulated vessel with a false bottom… …   Wikipedia

  • lauter tub — noun or lauter tun : a large tank containing a slotted or perforated false bottom for filtering the clear liquid wort from the residual grain in the mash in brewing * * * /low teuhr/, Brewing. a tank for draining off and filtering the wort from… …   Useful english dictionary

  • Hasenjagd - Vor lauter Feigheit gibt es kein Erbarmen — Filmdaten Deutscher Titel: Hasenjagd – Vor lauter Feigheit gibt es kein Erbarmen Produktionsland: Österreich Erscheinungsjahr: 1994 Länge: 106 Minuten Originalsprache: Deutsch Altersfreigabe …   Deutsch Wikipedia

  • Hasenjagd – Vor lauter Feigheit gibt es kein Erbarmen — Filmdaten Deutscher Titel: Hasenjagd – Vor lauter Feigheit gibt es kein Erbarmen Produktionsland: Österreich Erscheinungsjahr: 1994 Länge: 106 Minuten Originalsprache: Deutsch Altersfreigabe …   Deutsch Wikipedia

  • Mashing — Interior view of a mash tun in a Scotch whisky distillery, showing the stirring mechanism. In brewing and distilling, mashing is the process of combining a mix of milled grain (typically malted barley with supplementary grains such as corn,… …   Wikipedia

  • Brewing — Brewer redirects here. For other uses, see Brewer (disambiguation). This article is about the commercial brewing of beer. For making tea, see Steeping. For homebrewing, see Homebrewing. A 16th century brewery Brewing is the production of beer… …   Wikipedia

  • Homebrewing beer — refers to the brewing of beer on a very small scale. The typical homebrewer brews as a hobby for personal consumption, free distribution at social gatherings, amateur competitions, and for other assorted generally non commercial reasons. History… …   Wikipedia

  • beer — /bear/, n. 1. an alcoholic beverage made by brewing and fermentation from cereals, usually malted barley, and flavored with hops and the like for a slightly bitter taste. 2. any of various beverages, whether alcoholic or not, made from roots,… …   Universalium

  • Beer — /bear/, n. Thomas, 1889 1940, U.S. author. * * * I Alcoholic beverage made usually from malted barley, flavoured with hops, and brewed by slow fermentation. Known from ancient times, beer was especially common in northern climates not conducive… …   Universalium


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.