Steam boiler explosions, in theory and in pactice; . Fig. 13.—Dome and Head. faces of contact with the dome were covered by a blackpolish indicating movement and abrasion. ill mm _^ ^^^B __^=t ^^^^r^ ^—d 1 IrJfilBiS w ... ML ,l^^^^^fe; §m ^finfflrn)3 ° ° ° P imWwSb^ 31 Fig. 14.—Explosion of Dome. Apparently, as the pressure and temperature increasedand decreased the dome-head might lift and fall, bend- DEFECTIVE DESIGNS. 103 ing on A as a center. Thus taking I as a center, themovement of C would be in the direction of F, while atD the direction would be toward J, and the direction ofmotion of
Steam boiler explosions, in theory and in pactice; . Fig. 13.—Dome and Head. faces of contact with the dome were covered by a blackpolish indicating movement and abrasion. ill mm _^ ^^^B __^=t ^^^^r^ ^—d 1 IrJfilBiS w ... ML ,l^^^^^fe; §m ^finfflrn)3 ° ° ° P imWwSb^ 31 Fig. 14.—Explosion of Dome. Apparently, as the pressure and temperature increasedand decreased the dome-head might lift and fall, bend- DEFECTIVE DESIGNS. 103 ing on A as a center. Thus taking I as a center, themovement of C would be in the direction of F, while atD the direction would be toward J, and the direction ofmotion of the two would nearly coincide. The exploded dome shows an indentation at I, due tothe motion of the foot of the stay. Another error in the design of this boiler is that thediameter of the dome shell is 34 inches, and a circle ofiron about 18 inches in diameter is punched out of the. Fig. 15.—Defective Form. shell at D. This opening is required only to admit aninspector or workman to the interior of the boiler, henceit is several inches wider than it should be. Defective design is illustrated in the case of the boiler, 104 STEAM BOILER EXPLOSIONS. the explosion of which left it in the form shown in theengraving.* This boiler consisted of two incompletely cylindricalshells, united as in the next figure, and ineffectively Fig. 16.—Junction of Shells. stayed at the lines of contact This is a form which,insufficiently braced, becomes peculiarly the case illustrated, the braces yielded, after havingbeen weakened by continual alteration of form, andsplit the two shells apart as seen. It is probably possibleto brace boilers of this type safely, but it is safer toavoid their use. They have sometimes been used formarine purposes, where lack of space compelled specialexpedients, the bracing consisting of strong bolts withnuts and washers on the outside of t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectsteambo, bookyear1887
