Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . end of the pipe, whenslugging and surging is theresult. Water-filled Radiators.—Radiators frequently fill withwater and are noisy becauseof the position of the may be true in any grav-ity system but particularly soin radiators having a singlepipe. When the valve of asingle-pipe radiator is openeda very small amount, theentering steam is immedia-tely condensed but the watercannot escape because the in-coming steam entirely fills the opening. Under this condition, theradia
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . end of the pipe, whenslugging and surging is theresult. Water-filled Radiators.—Radiators frequently fill withwater and are noisy becauseof the position of the may be true in any grav-ity system but particularly soin radiators having a singlepipe. When the valve of asingle-pipe radiator is openeda very small amount, theentering steam is immedia-tely condensed but the watercannot escape because the in-coming steam entirely fills the opening. Under this condition, theradiator may entirely fill with water. If the valve is then openedwide, the imprisoned water has an opportunity to escape whilethe steam is entering, but the entering steam and escaping watersets up a water-hammer that sometimes is terrific and lastsuntil the water is discharged from the radiator. The samecondition may exist in a two-pipe system, if the steam valve isslightly opened while the escape valve is closed, but in a well-designed system the radiator will be immediately emptied whenboth valves are Fig. 9.—Diagram of the overhead ordrop system steam plant. 16 MECHANICS OF THE HOUSEHOLD Air Vents.—All radiators must be provided with air vent is placed near the top of the last loop of the radiator,at the end opposite from the entering steam, as indicated in , 3, 6, etc. The object of the vent is to allow the air toescape from the radiator as the steam enters. Steam will notdiffuse with the air and, therefore, cannot enter the radiatoruntil the air is discharged. The air vent may be a simple cocksuch as is shown in Fig. 10, that must be opened by hand whenthe steam is turned on, to allow the air to escape, and closedwhen the steam appears at the vent; or it may be an automaticvent, that opens when the radiator cools and closes automaticallywhen the radiator is filled with steam. There are many makes
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkmcgrawhillb
