Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . on and in the radiator connections. The flow pipe is taken to the attic and there joined to theexpansion tank as a point of distribution. On the expansiontank is a safety valve set at 10 or more pounds pressure. Theflow of the water is all downward toward the radiators. Thecirculation through the radiators is also different from the otherplants described. The supply pipe joins directly to the returnpipe and the connections to the radiators are made at the top and THE HOT-WATER HEAT
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . on and in the radiator connections. The flow pipe is taken to the attic and there joined to theexpansion tank as a point of distribution. On the expansiontank is a safety valve set at 10 or more pounds pressure. Theflow of the water is all downward toward the radiators. Thecirculation through the radiators is also different from the otherplants described. The supply pipe joins directly to the returnpipe and the connections to the radiators are made at the top and THE HOT-WATER HEATING PLANT 45 bottom of the same end. The circulation through the radiatorsin this case is due to the difference in gravitational effect betweenthe hot and colder water at the top and bottom of the system requires no air vents on the radiators as all air thatmight collect in the system goes up to the expansion tank. Thesafety valve on the expansion tank in this case is the commonlever type. The overflow should empty into the sewer and bepitched to prevent any water being retained in the discharge. Fig. 35.—The overhead system of hot-water heating. pipe. If water should be retained in this pipe and should freeze, would become dangerous, because of the possibility ofhigh pressures from a hot fire. Expansion Tanks.—Fig. 36 is a form of expansion tank incommon use. It may be used for either the high- or low-pressuresystem. The body of the tank is made of galvanized iron andis made to stand a considerable amount of pressure. The gage-glass is attached at fi, and the overflow at 0. The pipe E con-nects the tank with the circulating system and D connects withthe cold-water supply as a convenience for filling the system 46 MECHANICS OF THE HOUSEHOLD with water. The object in placing the stop-cock D near theexpansion tank is to avoid overflowing the system in overflow pipe, as stated above, is most conveniently con-nected with the sewer, into which t
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