Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . dsof piano wire. These last mentioned details are factors in thecause of safety, and are used as a precautionary measure toinsure freedom from explosion. Fig. 32 represents a type of boiler known as the nest-coilsemi-flash. It consists of a coil of 3/j-inch seamless tubing,ranging in length from 30 to 60 feet. The feed-water isdelivered into one end of the coil at the bottom, in very smalljets, at varying intervals. It is almost
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . dsof piano wire. These last mentioned details are factors in thecause of safety, and are used as a precautionary measure toinsure freedom from explosion. Fig. 32 represents a type of boiler known as the nest-coilsemi-flash. It consists of a coil of 3/j-inch seamless tubing,ranging in length from 30 to 60 feet. The feed-water isdelivered into one end of the coil at the bottom, in very smalljets, at varying intervals. It is almost instantly flashed intosteam, and in traveling through the length of the coil it isfurther heated and delivers into the small drum C, in theform of superheated team. 156 LAYING OUT FOR BOILER MAKERS Strictly speaking, this not being much of a boiler makersboiler, the repairs are more efficiently executed by the buildersthemselves as their conveniences enable them to bend thetubing easier and better than could be accomplished in mostboiler shops. Boilers of the Fig. 31 and 32 type have a large margin ofsafety, being tested with hydrostatic pressure in some cases. FIG. 33- as high as 3,000 pounds per square inch. The ordinary work-ing pressure varies between 200 and 450 pounds per squareinch. It was a slight modification of the Fig. 31 type of boilerthat furnished power for the Stanley steam racer when it broke the worlds record by making a mile in 28 1-5 seconds,the greatest speed attained by any self-propelled vehicle everbuilt. A peculiar combination of fire and water-tube boiler isshown in Fig. 33. It consists of an upper and lower annularsteam and water chamber, connected by rows of vertical- watertubes. These again inclose fire tubes of a still smaller di-ameter, which extend through the steam and water chambersand discharge into the stack. The top and bottom steam andwater chambers are also perforated and contain short firetubes, not shown in the drawing, which allow some
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
