. The street railway review . FIG. 5. EUROPEAN- PRACTICE IN BOILEK CONSTRUwHoN. designed for a working pressure of 215 lb. A superheater with 360sq. ft. of heating surface capable of furnishing a superheat up to570° F. is installed between the tubes and the drum. As will beseen from the illustration, the economizer is placed directly behindthe boiler, thus avoiding long runs. 734 STREET RAILWAY REVIEW ( XV, No. 10. Each boiler contained 14 headers of eight 4-in. tubes, and as eachheader was connected to the drum by one 4-in. tube, the circulatingwater from the eight tubes would have to pa
. The street railway review . FIG. 5. EUROPEAN- PRACTICE IN BOILEK CONSTRUwHoN. designed for a working pressure of 215 lb. A superheater with 360sq. ft. of heating surface capable of furnishing a superheat up to570° F. is installed between the tubes and the drum. As will beseen from the illustration, the economizer is placed directly behindthe boiler, thus avoiding long runs. 734 STREET RAILWAY REVIEW ( XV, No. 10. Each boiler contained 14 headers of eight 4-in. tubes, and as eachheader was connected to the drum by one 4-in. tube, the circulatingwater from the eight tubes would have to pass through this onenarrow passage, the Schukert company decided to add a horizontalheader with 22 tubes connected directly with the drum by means ofeight 4^A-in. tubes, the idea being to improve the circulation in thelower tubes and decrease the liability of burning them. In addition. HG. 6. INDEPENDENTLY FIRED SUPERHEATER OF THE BUETTNER to this, in the boiler drum is installed a Dubian artificial water cir-culating apparatus by which the generation of steam is increased, itis claimed, from normal 3 lb. per sq. ft. of heating surface to 4 higher. Steam and water passing up through the header withgreat force, pass through the vertical tubes of this system, whichproject above the high water level in the drum, thus greatly accel-erating the circulation and evaporation. The ash hopper through which the soot passes to a common con-veyor, is built in with the boiler setting entirely of brick, thus elim-inating the objectionable features of the iron hoppers common inthis country. Where wrought iron hoppers are used it frequentlyhappens that hot ashes are dumped into them from the grates,raising the hoppers to a red heat, and then by the application ofwater they are suddenly and unevenly cooled and warped out ofshape, and in eight or ten years are often
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