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A silo (from Ancient Greek σιρός (sirós) 'pit for holding grain') is a structure for storing bulk materials. Silos are commonly used for bulk storage of grain, coal, cement, carbon black, woodchips, food products and sawdust. Three types of silos are in widespread use today: tower silos, bunker silos, and bag silos.
Railroad grain terminal in Hope, Minnesota. A grain elevator or grain terminal is a facility designed to stockpile or store grain. In the grain trade, the term "grain elevator" also describes a tower containing a bucket elevator or a pneumatic conveyor, which scoops up grain from a lower level and deposits it in a silo or other storage facility.
A preheater tower, rawmix silo and exhaust stack. Bottom left: rawmill. Bottom right: rotary kiln with tertiary air duct above. The U-shaped duct leading from the kiln inlet is an "alkali bleed". A typical process of manufacture consists of three stages: grinding a mixture of limestone and clay or shale to make a fine "rawmix" (see Rawmill);
The 120-metre (390 ft), 33-storey, reinforced concrete tower was designed by Karl Lieser and was built from 1959 to 1961. It was inaugurated on 18 May 1961. [3] It was demolished in 2013. Until 1974 it was the tallest building in Frankfurt, and it remained the tallest storage silo in the world until its demolition.
Another tower in Oklahoma, built in 1986 and billed as the "largest water tower in the country", is 218 ft (66 m) tall, can hold 500,000 US gallons (1,900 m 3), and is located in Edmond. [17] [18] The Earthoid, a perfectly spherical tank located in Germantown, Maryland is 100 ft (30 m) tall and holds 2,000,000 US gallons (7,600 m 3) of water ...
The Swissmill Tower can store 40,000 tonnes of grain. [6] Swissmill is the largest mill company in Switzerland, processing 800 tons of grain daily. This represents 30% of the Swiss national grain requirements. It supplies flour for Swiss retailers Coop, Volg and Landi. [3] Critics have said the silo's exterior and height are overly industrial.
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Silos are potentially hazardous: deaths may occur in the process of filling and maintaining them, and several safety precautions are necessary. [15] There is a risk of injury by machinery or from falls. When a silo is filled, fine dust particles in the air can become explosive because of their large aggregate surface area.