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The usual working pressure of a firehose can vary between 8 and 20 bar (800 and 2,000 kPa; 116 and 290 psi) while per the NFPA 1961 Fire Hose Standard, its bursting pressure is in excess of 110 bar. (11,000kPa; 1600psi) [ 2 ] Hose is one of the basic, essential pieces of fire-fighting equipment.
A Belleville washer is a type of spring shaped like a washer. It is the shape, a cone frustum , that gives the washer its characteristic spring. The "Belleville" name comes from the inventor Julien Belleville who in Dunkerque , France, in 1867 patented a spring design which already contained the principle of the disc spring.
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In the 1950s, the United States Forest Service became interested in reducing the number of fires started by logging equipment in the National Forest System. [3] This interest led to a partnership with the Society of Automotive Engineers and the development of the following test standards for spark arresters:
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