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 . 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
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 . 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 section ofheads being «on the inside, the lower parts are scarped downat the lap; for shell, this should be done very carefully, sothat no unnecessarj shaping will be required to the shellplates over these laps, as the shell plate should not be heatedunless they are annealed after being operated upon. The rivets securing the two sections of front head will bearranged to be driven flush on the outside, as this saves con-siderable trouble in fittingthe smoke box or uptake, if thestays and nuts are to be outside of the box. HOW TO LAY OUT A SCOTCH BOILER 115. ii6 LAYING OUT FOR BOILER MAKERS The upper part of uptake will have to be secured to boilerabout over this cross-seam in front head of boiler, and if therivets are not arranged for and driven flush, considerabletrouble is found in making the connection. BACK HEAD. The wrapper and back heads of combustion chambers aremade of plates 9-16 inch thick and single riveted, as shownabove. This style of joint is used for all the single rivetingthroughout the boiler. The plates are stayed with i3/^-inchand i^-inch screw stays, 12 threads per inch. (Fig. 10.) The i^-inch, 12-thread stays are fitted all around the edgeof back heads of combustion chambers, as these help to stiffenup the wide spaces on back head. All the stays on back heads of combustion chambers insideof the row of ij^-inch stays are iJS4-inch diameter, 12 threadspe
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
