Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . m 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-
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . m 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 the water will run in case ofan overflow, but the other methods shown are commonly should be no valve in this pipe nor in the pipe E,. Fig. 36.—The expansion Fig. 37.—When the expansion tank of a hot- tank, water heating system must be so located that it is apt to freeze, it must be piped as a radiator. The expansion tank must be so located that there will be nodanger of freezing. Should it be necessary to place the tank in theattic or where freezing is possible, the tank must be so connectedas to become a part of the circulating system. Such an arrange-ment is shown in Fig. 37. The expansion tank is connected witha supply and return pipe as a radiator. This arrangement issometimes used but it is not desirable. It is wasteful of heatand there is always a possibility of freezing in case the fire in THE HOT-WATER HEATING PLANT 47 the furnace is extinguished a sufficient time to allow the waterto grow cold. Any possibility of danger from excessive pressures in eitherthe low-pressure or the high-pressure
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