Engineers' and firemen's license law . ed for a maximum working pressure not to exceed onehundred (100) pounds per square inch, the segment of headabove the tubes may be stayed by steel angles, or Tee bars, the formula being fl = M. I = moment of inertia = f = fiber stress = 16,000 pounds. bh_3 12* j h = height of beam, in inches. ( b = thickness of beam, in = distance of most strained fiber = h -f- = bending moment of beam. Maximum bending moment for uniform load = WL 8 W = weight to be supported, in pounds. )L = length of beam, in inches. i Part III. — Section 4. 31 Example A.—W
Engineers' and firemen's license law . ed for a maximum working pressure not to exceed onehundred (100) pounds per square inch, the segment of headabove the tubes may be stayed by steel angles, or Tee bars, the formula being fl = M. I = moment of inertia = f = fiber stress = 16,000 pounds. bh_3 12* j h = height of beam, in inches. ( b = thickness of beam, in = distance of most strained fiber = h -f- = bending moment of beam. Maximum bending moment for uniform load = WL 8 W = weight to be supported, in pounds. )L = length of beam, in inches. i Part III. — Section 4. 31 Example A.—When steel angles are used, the head of a stayinghorizontal return tubular boiler, thirty (30) inches in diameter, h^t? 3°designed for one hundred (100) pounds working pressure, tooiler-shall be stayed by two (2) four and one-half by three by three-eighths(4| X 3 X |) inch steel angles, as shown in Fig. 12, or by other sizedcommercial steel angles the resistance of which shall be equal to orgreater than the maximum bending fig. 12. Distance from tubes to shell = 13J. Area to be stayed = 143 square inches. Load at 100 pounds pressure = 14,300 pounds. WL= 14,300 X 21 _ 3T)540 poundg 8 8 Moment of inertia = I = TV X X|= = -T- 2 = fl = M = 16,000 X = 2(^266 poimds for one Eesistance of one angle = 20,266 of two angles = 40,532 pounds. Example B.—When steel angles are used, the head of staying „ .. • / -, \ • i • heads 36 a horizontal return tubular boiler, thirty-six (36) inches in h. t. boner. 32 Paet III.—Section 4. diameter, designed for one hundred (100) pounds working pressure,shall he stayed by two (2) six by three and one-half by one-half(6 X 3| X i) inch steel angles, as shown in Fig. 13, or by other sizedcommercial steel angles the resistance of which shall be equal to orgreater than the maximum bending moment. 27 -/t&,*-/g^< v/ jdeffe^bj&pe. ^%5 S* es 7* To <A \ 7 fi\ 7*— <r *
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