. Tentative revised boiler safety orders. r drums when used, shall havethe proper curvature, and on boilers over 48 in. in diameter shallbe riveted to the shell or drum with two rows of rivets, which maybe pitched as shown in Fig. 21. The strength of manhole framesand reinforcing rings shall be at least equal to the tensile strengthof the maximum amount of the shell plate removed by the openingand rivet holes for the reinforcement on any line parallel to the 4 NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 73 longitudinal axis of the shell through the manhole, or otheropetoingj. 261 The s
. Tentative revised boiler safety orders. r drums when used, shall havethe proper curvature, and on boilers over 48 in. in diameter shallbe riveted to the shell or drum with two rows of rivets, which maybe pitched as shown in Fig. 21. The strength of manhole framesand reinforcing rings shall be at least equal to the tensile strengthof the maximum amount of the shell plate removed by the openingand rivet holes for the reinforcement on any line parallel to the 4 NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 73 longitudinal axis of the shell through the manhole, or otheropetoingj. 261 The strength of the rivets in shear on each side of a man-hole frame or reinforcing ring shall be at least equal to the tensilestrength of the maximum amount of the shell plate removed bythe opening and rivet holes for the reinforcement on any lineparallel to the longitudinal axis of the shell, through the manhole,or other opening. 262 Manhole plates shall be of wrought steel or shall be steelcastings. ? {Longifudinal ^ Center Line of Shell. Pig. 21 Method op Riveting Manhole Frames toShells or Drums with Two Eows of Rr^ets 263 The minimum width of bearing surface, for a gasket on amanhole opening shall be % in. No gasket for use on a manhole orhandhole of any boiler shall have a thickness greater than ^ in. 264 All boilers must be provided with suitable manhole orhandhole openings, except special types where they are manifestlynot needed or used. A manhole shall be located in the front head,below the tubes, of a horizontal return tubular boiler 48 in. or overin diameter. Smaller boilers shall have either a manhole or a hand-hole below the tubes. There shall be a manhole in the upper partof the shell or head of a fire-tube boiler over 40 in. in diameter,except a vertical fire-tube boiler, or except on internally firedboilers not over 48 in. in diameter. The manhole may be placed inthe head of the dome. Smaller boilers shall have either a manholeor a handhole abo^^e the tubes. 74 rep
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
