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 . ing X 5-6 = square inches, as the area supported by each rivet X I75 = 4i6S5 pounds, stressper rivet. With J^-inch rivets, tensile strength 30,050, the factor ofsafety will be 30,050 divided by 4,655 = It will be notedthat the area alloted to two rivets will exceed the area thatthe brace will have to carry. In this connection it might bestated that some authorities figure the area from the maximumpitch of ri
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 . ing X 5-6 = square inches, as the area supported by each rivet X I75 = 4i6S5 pounds, stressper rivet. With J^-inch rivets, tensile strength 30,050, the factor ofsafety will be 30,050 divided by 4,655 = It will be notedthat the area alloted to two rivets will exceed the area thatthe brace will have to carry. In this connection it might bestated that some authorities figure the area from the maximumpitch of rivets or stays, paying no attention to the minimumpitch. Others square both the maximum and minimum pitch,add them togeher and divide the product by two. This, ofcourse, does not give the actual area, but it does serve as acheck on unreliable work. The rivets in the palm of the brace where the brace is at-tached to the shell will be in single shear. The brace beingsubjected to 8,575 pounds, the rivets should likewise be figuredfor this load. Since the factor 7 was used in figuring thebrace, it should also be used in figuring the rivets so they will * «P»n.»». FIG. 31. not be weaker than the stay. 8,575 X 7 = 60,025. Our tableshows that this would require us to use two i-inch the factor required for the rivets in tension we find8,575 X ^ 55, This would require two is/i6-inchrivets. SIZE OF PALM. Tlie width of the palm will depend upon its thickness. As-suming that we make the braces out of J^-inch steel we willhave I square inch (the sectional area) divided by .375 = To this we must add the diameter of the rivet made of J-^-inch steel we would have i square inch dividedby .50 = 2 inches, to which we must add tlie diameter of therivet hole. FORMS OF DIAGONAL In Fig. 32 is shown a diagonal brace fastened to the head•with inside and outside nuts. It will be seen that this bracestrikes the sheet at an angle and to have t
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
