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 . offa distance 4 feet 6 1-16 inches from this line, and draw thecenter line CC of the boiler. From the center K strike a out the five bridges A as shown. All the metal is to bepunched out along the circle except at these bridges. Makethe bridges that remain about 2 inches wide. These are usedfor holding the sheet together when it is being flanged. Measure off the distance [7 on the right-hand view, andlay off a distance U -\- yi
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 . offa distance 4 feet 6 1-16 inches from this line, and draw thecenter line CC of the boiler. From the center K strike a out the five bridges A as shown. All the metal is to bepunched out along the circle except at these bridges. Makethe bridges that remain about 2 inches wide. These are usedfor holding the sheet together when it is being flanged. Measure off the distance [7 on the right-hand view, andlay off a distance U -\- yi inch on the left-hand view. Also layout a plan view of the lower part of the sheet and measureoff the length of the neutral line X. Lay off the distanceX + I inch as shown. In a similar manner lay off severalintermediate sections and determine the length of V and W,and lay out F -|- J^ inch and W -|- yi inch as shown. Throughthese points draw the outline of the sheet, thus completing thework until it comes from the flangers. TOP THROAT SHEET. The top throat sheet of this Belpaire boiler is representedin Fig. 49. CC is the center line. Strike off arcs from each. Fig. io rig. 43 circle with a radius of 3 feet H inch. Strike another circleJ4 inch outside of this, and draw the outside lines of thesheet as they would appear when flanged. Now lay out the flat portion at LL, and draw the lines Mand M to suit the dimensions on the boiler card. Also lay outthe right hand view of Fig. 48. This can be done either on thethroat sheet or on some other sheet. Measure off the dis-tance P along the neutral line of the sheet. Now lay off thisdistance P -\- Yi inch, as shown along the center line CC. Ina similar manner measure off the distance R on the right-handview, then lay off a distance i? + !^ inch, as shown on theleft-hand view. Measure off the distance S and lay out thedistance 7 in a central position. To get the length of T, takethe average length of S and R -^ Y. Now find a radius which
Size: 1775px × 1407px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
