. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. uces the amount of power required tO Economizers, W. F. Wurster 157 operate the scraper mechanism. The power required for operating thescrapers is about 1 hp. for 125 tubes. The mechanism for reversing the direction in which the scrapers travelconsists of a shaft running the length of the economizer supported by thegear frame. Worms on this shaft engage with worm wheels which arebolted to pulleys, over which the chains supporting the scraper bars andguards are run. The reversing is accomplished by a clu
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. uces the amount of power required tO Economizers, W. F. Wurster 157 operate the scraper mechanism. The power required for operating thescrapers is about 1 hp. for 125 tubes. The mechanism for reversing the direction in which the scrapers travelconsists of a shaft running the length of the economizer supported by thegear frame. Worms on this shaft engage with worm wheels which arebolted to pulleys, over which the chains supporting the scraper bars andguards are run. The reversing is accomplished by a clutch-and-pivotedreversing lever which has a rolling weight to insure quick and positiveengagement. A cross shaft is mounted in back of the reversing breastand driven from the first worm wheel. A worm on this shaft drives,through an idler, a wheel which is mounted on the top of the frameand in back of the pivoted reversing lever. Two adjustable fingers onthis wheel engage the reversing lever and force it first to one sideand then to the other, as the wheel carrying the fingers is revolved. FIG. 2. LAYOUT OF A TYPICAL BOILER PLANT SHOWING INSTALLATIONOF ECONOMIZERS AT REAR OF SETTINGS through an arc, first in one direction, and then in the other change in the position of the reversing lever causes the clutch toengage alternately the right and left hand beveled pinions, transmittingmotion to the longitudinal shaft. The sectional covers consist of two steel plates with about 2 in. ofasbestos or other insulating material between. This method of enclosingone or both sides of the economizer is now preferred to the older methodof bricking in the machine as it permits easy access for inspection andcleaning. In determining the saving which can be made by an economizer, variousfactors are taken into consideration. The most important of these factorsare the temperature and quantity of gases available, and the initial tem-perature and quantity of the feed water which is to be h
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