Steam boiler explosions, in theory and in pactice; . eferred to as being at the ends of the sheet, andin some places so nearly through that it was difficult todetect the mere scale of good iron left, while in otherplaces there remained a sixteenth of an inch of soundmetal. Fig. 36 exhibits a section of thecrack. Were this the weakest part in theboiler, and the least thickness here one-sixteenth of an inch, the tensile strengthbeing equal to the average determinedby the tests to be described, the pressurerequired to rupture such a boiler, tenfeet in diameter, would be 44079X1-16X 2-7-120=47 lbs
Steam boiler explosions, in theory and in pactice; . eferred to as being at the ends of the sheet, andin some places so nearly through that it was difficult todetect the mere scale of good iron left, while in otherplaces there remained a sixteenth of an inch of soundmetal. Fig. 36 exhibits a section of thecrack. Were this the weakest part in theboiler, and the least thickness here one-sixteenth of an inch, the tensile strengthbeing equal to the average determinedby the tests to be described, the pressurerequired to rupture such a boiler, tenfeet in diameter, would be 44079X1-16X 2-7-120=47 lbs- Per square inch, near-ly. A pressure of twenty-seven poundswould burst it open where the least thick-ness was slightly more than one-thirty-second of an portion may be supported, to some extent, by aneighboring stronger part. Along this longitudinalseam the limit of strength would seem to have beenabout thirty pounds per square inch, which is about thepressure at which the boiler exploded, this seam rippingfor a distance of several Fig. 36. Grooving. 120 STEAM BOILER EXPLOSIONS. The original strength of the boiler was equal to aboutone hundred and twenty pounds along the horizontalseams—its then weakened parts,—provided that theiron had, when new, the average strength of the speci-mens which we have tested. In the vertical seams maybe seen, in some places, similarly weakened portions,the cracks running usually from rivet to rivet, and hereand there exhibiting marks that show the wedgingaction of the drift-pin/ and many places, both inlongitudinal and girth seams, are cut by the chisel andmarked by the caulking-tool. These lines of furrowing are sometimes continuous,and sometimes interrupted by portions of good are probably, in most cases, caused by changes inform of the boiler with variations of temperature andpressure, some line of local weakness determining theline along which the plate shall bend; and this bendingtaking place continually, thou
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectsteambo, bookyear1887
