. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. ing and Ventilating Engineers, Philadelphia, Pa., January,1931. 155 (56 Transactions of Am. See. of Engineers banking or bridging of soot across from one header to another and alsoallows room for the insertion of a mans arm to adjust or replace scrapersshould this become necessary. One end of the header is extended hori-zontally to pass beyond the side wall of the economizer chamber. Thisextension is flanged for connection to the bottom branch pipe. The headers previously described are provi
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. ing and Ventilating Engineers, Philadelphia, Pa., January,1931. 155 (56 Transactions of Am. See. of Engineers banking or bridging of soot across from one header to another and alsoallows room for the insertion of a mans arm to adjust or replace scrapersshould this become necessary. One end of the header is extended hori-zontally to pass beyond the side wall of the economizer chamber. Thisextension is flanged for connection to the bottom branch pipe. The headers previously described are provided with tapered socketsto receive the ends of the tubes. One method is to have both ends ofthe tube taper in opposite directions. In this case the tubes are pressedsimultaneously into the top and bottom headers. Another method is tohave the ends of the tubes tapered in the same direction. In this casethe tubes are inserted through the top header. Sections are built with 4 to 12 tubes each. These tubes vary from 6 to12 ft. in length and are 4-9/16 in. in diameter. The number of sections. FIG. 1. CROSS-SECTION OF A TYPICAL BOILER PLANT SHOWING INSTALLATION OF AN ECONOMIZER in an economizer is a multiple of four which is due to the fact that thepulley on the scraper driving mechanism operates the scrapers for foursections. The bottom headers are connected to a bottom branch pipe. This pipeis flanged on one end to receive the feed line and on the other end for ablow-ofif valve. The top headers are also connected to a top branch pipefor collecting the heated water. One end of the branch pipe is flangedfor connection to boiler feed line. The other end is blanked. Provisionis made for a relief valve on the top branch pipe. The exterior of each tube is kept free from soot by means of scraperswhich travel continuously up and down the outside of the tubes at a slowspeed. The soot falls into the soot pit beneath the economizer, whenceit can be removed at regular intervals. The lifting ba
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