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 . o A so asto give the necessary thread on each end. In Fig. 56 is illus-trated one of these stays just after it has been screwed intoplace. It is nicked at A^ by hand and is then broken off, or isthen clipped off with pneumatic stay-bolt clipper. The stay-bolt is cut off inside and outside, leaving sufficient metal forriveting over. The safety hole is drilled in the center, asshown in Fig. 55. The six central rows of crown stays
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 . o A so asto give the necessary thread on each end. In Fig. 56 is illus-trated one of these stays just after it has been screwed intoplace. It is nicked at A^ by hand and is then broken off, or isthen clipped off with pneumatic stay-bolt clipper. The stay-bolt is cut off inside and outside, leaving sufficient metal forriveting over. The safety hole is drilled in the center, asshown in Fig. 55. The six central rows of crown stays are nearly all maderadial to the crown sheet. Fig. 57 shows this stay. It is i]4,inches at the threaded part and 15-16 inch in the stays are headed up in the bolt machine and are usuallygotten out to suit the boiler for which they are intended, andthus vary but little in length from what is actually stay must have a 3-32-inch fillet on the inside of the insidesheet and on the outside of the outside sheet. The threadsare V shaped, 12 threads per inch, and the holes in the sheetmust be tapped so as to give a full thread. In punching the. FIG. S3- FIG. 54. without staying. Side cylindrical sheets with a pressure act-ing all around must usually be stayed, as these sheets are aptto collapse. This is not always true, however, especially whenthe cylinder is small. But when the cylinder is of large diame-ter some method must be used to prevent it from collapsing. The Morison corrugated boiler needs no staying. Themethod of staying determines the different varieties of boil-ers. The Belpaire boiler is rendered simple from a standpointof staying for the reason that all crown stays are radial orpass through the sheet at right angles to it. The head on thestay can be formed up to much better advantage, as the nutand washer bear evenly all around. This radial staying isdifferent from that which must be employed in the commonform of locomotive main fire-box, for th
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
