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 . wn bars andwater spaces between the tubes. In arranging them in this case, we locate two on the center line, one above the other,and 14 inches each side of this we locate two more, then 14,-^inches from these two we locate two more, and 141^ inchesfrom these we locate one more in the lower row. Now, tofind the load on each stay, we find that the maximum surfacefor one stay to support is inches by 15-)^ inches, s
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 . wn bars andwater spaces between the tubes. In arranging them in this case, we locate two on the center line, one above the other,and 14 inches each side of this we locate two more, then 14,-^inches from these two we locate two more, and 141^ inchesfrom these we locate one more in the lower row. Now, tofind the load on each stay, we find that the maximum surfacefor one stay to support is inches by 15-)^ inches, square inches, this multiplied by 175 (the steam pres-sure carried) gives a total strain or load of 39,648 pounds, andto arrange for the stress on the stay not to exceed 9,000pounds per square inch, we divide 9,000 into 39,648, whichgives a result of square inches area. To give square inches area we find that we will haveto use a stay 2% inches diameter with 8 threads per diameter need only be at the ends where the thread iscut; the body of the bolt can be of less diameter, just so thatit does not give an area less than square inches. Where. FIG. 10. a thread is cut the area is always taken at the bottom of thethread. The body of these bolts we find can be made 2^inches diameter. It is not often that fine threads are cut on these stays, ascoarse threads are better. A loose washer is usually fitted under the inside nut; thisis counterbored to hold packing, and held up in place by theinside nut, as shown. The outside washers we have made 10^2 inches diameter by]4 inch thick and riveted to the head by six i 1-16 inch rivets,on a pitch circle of 75/2 inches. To give space to calk thewashers and seams on heads, a portion of the lower outsidewashers is cut away, as shown on the drawing of the boiler. The laps of the heads are double-riveted, as shown in , and located near the tubes in front, and stays at top ofcombustion chambers in the back head. The top se
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
