. The principles of mill and factory inspection for fire insurance purposes : with notes on the hydraulics of automatic sprinkler protection . e must belarge enough to supply water, under proper pressure(pounds to the square inch), to all of the automaticsprinklers attached to it, or at least the number that isliable to be opened by the heat or flame of a single sizes for automatic sprinkler equipments will befound in the standard recommended by the NationalBoard of Fire Underwriters. It will be noticed that agiven number of automatic sprinklers (or heads) is al-lowed on a pipe of a
. The principles of mill and factory inspection for fire insurance purposes : with notes on the hydraulics of automatic sprinkler protection . e must belarge enough to supply water, under proper pressure(pounds to the square inch), to all of the automaticsprinklers attached to it, or at least the number that isliable to be opened by the heat or flame of a single sizes for automatic sprinkler equipments will befound in the standard recommended by the NationalBoard of Fire Underwriters. It will be noticed that agiven number of automatic sprinklers (or heads) is al-lowed on a pipe of a certain diameter. Each size pipeis large enough to feed the number of automatic sprinklersallowed on it, including loss of pressure due to the waterrubbing against the inside surface (friction). The smallestpiping is at the ends of lines (^^laterals^) ; the largestpipes are the main supply pipes. Doubling the diameterof a pipe increases its carrying capacity four times, ap-proximately. Suppose a 2-inch water pipe is used for acertain purpose. The cross section of a 2-inch pipe con-tains 4 square inches, which is found by simply squaring. SAVED BY SPRINKLERS Automatic sprinklers saved these buildings from theattack of an exposure fire across the street. Woodenwindow frames and sash in the lower building weredestroyed. 78 MILL AND FACTORY INSPECTION the diameter (multiplying the diameter by itself). Apipe of twice the diameter^ that is 4 inches, will have across section of 16 square inches which is four times thenumber of square inches in the cross section of a 2-inchpipe. The opening (orifice) of an automatic sprinkler is%-inch in diameter, or .39 square inches. Only one auto-matic sprinkler is allowed by modern pipe schedules to besupplied by a pipe 1-inch in diameter which is twice thediameter of the orifice of an automatic sprinkler, or .7854square inches. Private Fire Brigades.—Private fire brigades or-ganized among the workmen of a manufacturing plant,department store, sh
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