Steam boiler explosions, in theory and in pactice; . 5.—Principal part 5 boiler thrown over the church on the —Principal part of No. 6 boiler. Fig. 48.—Explosion of two Steam Boilers at Pittsburg, Pa. THE RESULTS OE EXPLOSIONS. I45 pounds of available stored heat-energy, entirely de-stroying the house in which they were set. In a case of explosion at Pittsburg, Pa., in December,1881, a battery of flue-boilers was connected, as seen inthe figure, by steam-drums above the nearer two and. Fig. 49.—Under Sides of Boilers. mud-drums beneath all three. The steam-pressure wasnot far fr
Steam boiler explosions, in theory and in pactice; . 5.—Principal part 5 boiler thrown over the church on the —Principal part of No. 6 boiler. Fig. 48.—Explosion of two Steam Boilers at Pittsburg, Pa. THE RESULTS OE EXPLOSIONS. I45 pounds of available stored heat-energy, entirely de-stroying the house in which they were set. In a case of explosion at Pittsburg, Pa., in December,1881, a battery of flue-boilers was connected, as seen inthe figure, by steam-drums above the nearer two and. Fig. 49.—Under Sides of Boilers. mud-drums beneath all three. The steam-pressure wasnot far from 125 pounds per square inch at the time ofthe accident. The boilers were fifteen years old, buthad been tested to 170 pounds two years earlier, andallowed to work at 120 pounds, although they had beenrepeatedly patched and repaired.* The rules of theinsurance companies would have allowed but one-halfthis pressure. The strains produced by the changes of form withvarying temperature of feed-water, and by the actionof the new iron of the patches on the older and corrodedparts of the boilers, started cracks which graduallyweakened them, and finally led to a rupture along theworst line of injury, A B> in the preceding figure, open-ing the course of plates at a> and tearing it out as in * Scientific American, Feb. 4, 1882. 146 STEAM BOILER EXPLOSIONS. the next figure, in which A £ is the line of initial frac-ture. The destruction of this (No. 6) boiler was accom-panied by the disruption
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectsteambo, bookyear1887
