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 . particular stack, assume that it isrequired to build a stack for boilers which have a total horse-power of 285 and a total grate area of about 60 square effective area of the stack should be about one-eighth thetotal grate area, or about 714 square feet. The diameter cor-responding to this area would be about 9 feet 8 inches. Theactual diameter of the stack, however, according to the as- 162 LAYING OUT FOR BOILER MAKERS
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 . particular stack, assume that it isrequired to build a stack for boilers which have a total horse-power of 285 and a total grate area of about 60 square effective area of the stack should be about one-eighth thetotal grate area, or about 714 square feet. The diameter cor-responding to this area would be about 9 feet 8 inches. Theactual diameter of the stack, however, according to the as- 162 LAYING OUT FOR BOILER MAKERS sumptions which were made, should be 4 inches greater thanthis, or about 10 feet. Using the equation Horsepower = (A — .6 X V^) VlT,and substituting 285 as the value of the horsepower and 10 as the value for A, the height of the stack may bedetermined: 285^ 3-33 ( - -6 V ) V77 V H = H = 191 Therefore, the required dimensions of the stack are: Height, 191 feet; diameter, 10 feet. The details of a stack built to these dimensions are shown in Fig. 2. The actual diameter of the shell of the stack will be greater than 10 feet, since the. FIC. II OF C.\P WITH VERTIC.\L STRIPS. inside diameter of llic lining should be at least 10 feet. As thelining at the top should be approximately 4 inches thick, theactual diameter of the stack at the point where the lining is?Stopped should be about 10 feet gy2 inches. A computation should be made for the thickness of plate atintervals of 25 or 30 feet throughout the height of the the formula quoted in the first part of the article forthe thickness of plate, we have at a height of 25 feet: 1C6II X 166 X 30 X X 12 T = .43, or, approximately, 7/16 inch. This is assuming amean diameter of 11 feet with a diameter of 12 feet 3 inchesat the height of 25 feet, and that the horizontal seam is doubleriveted with an efficiency of 75 percent. Alaking the same computation at a height of 65 feet, wherethe diamet
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
