. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. Braces in the Boiler.—The proper bracing of flat sur-faces exposed to pressure, is a matter of the greatest impor-tance, as the power of resistance to bulging possessed by anyconsiderable extent of such a surface, made as they must be inthe majority of cases of thin plates, is so small that practicallythe whole load has to be carried by the braces. This being thecase, it is evident tliat as much attention should be given toproperly designing, proportioning, distributing and c
. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. Braces in the Boiler.—The proper bracing of flat sur-faces exposed to pressure, is a matter of the greatest impor-tance, as the power of resistance to bulging possessed by anyconsiderable extent of such a surface, made as they must be inthe majority of cases of thin plates, is so small that practicallythe whole load has to be carried by the braces. This being thecase, it is evident tliat as much attention should be given toproperly designing, proportioning, distributing and construct-ing the brace as to any other portion of the boiler. All flat surfaces should be strongly supported with braces ofthe best refined iron, or mild steel, having a tensile strengthof not less than 58,000 lbs. to the square inch. These bracesmust be provided with crow feet or heavy angle iron properlydistributed throughout the Fig. 44 98 Maxims and Instructions. BRACING OF STEAM BOILERS. Fig. 43 shows the method usually followed in staying smallhorizontal tubular boilers. The cut represents a 36-incli headand there are five braces in each head : two short ones andthree long ones. The braces should be attached to shell andhead by two rivets at each end. The rivets should be of suchsize that the combined area of their shanks will be at leastequal to the body of the brace, and their length should besuflBcient to give a good large head on the outside to realizestrength equal to the body of the brace. In boilers with larger diameters, 5 to 8 feet, stay ends aremade of angle or T iron ; by this arrangement the stays can beplaced furtlier apart, the angle irons very effectively stayingthe plate between the stays, and thus affording more room inthe body of the boiler. The size of the stays have to beincreased in proportion to the greater load they have tosustain. See Fig. 43. In a 66-inch boiler it is proper to hav
Size: 2480px × 1008px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteamen, bookyear1917
