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 . ack 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 d
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 . ack 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 diameter is 11 feet 7 inches, and the horizontal seam singleriveted with an efficiency of about 60 percent, T is found to beabout .344, or Y^ inch. At a height of 95 feet, where thediameter is 11 feet 3 inches, T is found to be about .21 it would not be advisable, however, to use anything lessthan 5<4-inch plate, the next 30 feet of the stack should be con-. 7854 X ( X 12) X 10,000 X -75 FIG. 12.—BELL SHAPEU PORTION OF SELF-SUPPORTING STACK. structed of 5/16-inch plate, leaving only the last 60 feet ofJ4-inch plate. The details of the riveting for the different thicknesses ofplate are shown in Figs. 6. 7, 8 and 9. It will be seen that thedouble-riveted horizontal seams give an efficiency of about 70percent, while the single-riveted seams give an efficiency of atleast 60 percent. The stack is constructed of rings each 60 inches wide, madeup of three plates. Where the diameter exceeds 12 feet eachring should be made in four sections. Each ring is in theform of the frustum of a right circular cone, and may be laidout according to any of the methods described in the firstchapter under conical surfaces where the taper is small. Inthe stack shown in Fig. 2 each ring is an in
Size: 1323px × 1889px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
