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 . n make the shellplate run from head to head in one piece (as plates of thiswidth can be rolled without very much trouble), thus doingaway with the middle circumferential seam, which is a con-stant source of trouble, by leaking at the bottom, due to ex-pansion and contraction. There is a great difference in temperature between thewater in the top and that in the bottom of a Scotch boiler, es-pecially so on first starting fire and
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 . n make the shellplate run from head to head in one piece (as plates of thiswidth can be rolled without very much trouble), thus doingaway with the middle circumferential seam, which is a con-stant source of trouble, by leaking at the bottom, due to ex-pansion and contraction. There is a great difference in temperature between thewater in the top and that in the bottom of a Scotch boiler, es-pecially so on first starting fire and getting steam; if the firesare forced to get steam quickly, when steam has formed, thewater in the bottom will be comparatively cold. While making the shell plate reach from head to head addsmaterially to the life of a Scotch boiler, it does not add tothe cost and is a much better job throughout. It does awaywith one long seam, the working under of butt straps and manyrivets. As we have the length of boiler now, we can draw in theoutside of each head and shell, connecting the outside of lowerheads with the inside of shell plate with a 3^-inch radius. JHirrtace. Eront Head > SWU Plate. FIG. I, and the top head with a 25^-inch radius; as it is customary tomake the top of heads heavier on account of the bracing, wearrange to put the top part of head on the inside of bottompart, as shown. The lower part of heads we will make 54-inch thick, the backtube sheet 54-nch thick, and the combustion chamber plates all9-16-inch thick; all inside laps should be arranged for singleriveting; the calculations for thickness of plates and the rivet-ing will be shown later, the idea being to have the drawing inoutline, and then go over all the calculations when this isfinished. We have located the position of the back tube sheet, so willdraw it in, arranging to turn the top flange down (for top plateof combustion chamber or wrapper) at a distance from centerof boiler of 31^4 inches; this gives
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
