Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . r distance from center to cen-ter of the teeth, is 5 in. The steam pipe is 18 in. insidediameter and the cylinders are jacketed with livesteam. This engine showed remarkable economy in the useof steam when working at or near the capacity forwhich it was designed by Mr. Corliss, which was 1,400horse power. At the time Fig. 75 was taken the loadwas 1,122 horse power and the boiler pressure was 32,5lbs. gauge, or lbs. absolute. The spring used was_ 234 ENGINEERING a No. 20, although a much bette
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . r distance from center to cen-ter of the teeth, is 5 in. The steam pipe is 18 in. insidediameter and the cylinders are jacketed with livesteam. This engine showed remarkable economy in the useof steam when working at or near the capacity forwhich it was designed by Mr. Corliss, which was 1,400horse power. At the time Fig. 75 was taken the loadwas 1,122 horse power and the boiler pressure was 32,5lbs. gauge, or lbs. absolute. The spring used was_ 234 ENGINEERING a No. 20, although a much better appearing diagramwould have been obtained by using a No. 30 spring. The diagram shows very slight compression, but thelead is correct. The point of cut off is not so clearlydefined as it should be, and the author attributes thecause of this to the spring being too weak for thereason that when Fig. 76 was taken some eight monthslater from the same end of the same cylinder, but witha spring of the proper tension for the pressure, thepoint of cut off is much more plainly defined. (SeeFig. 76.). FIGURE 76. The absolute initial pressure, as shown by Fig. 75,was lbs., and the absolute terminal pressure lbs. The ratio of expansion would therefore be47-5 * 8-5 = 5-6. The steam consumption per I. H. hour was 14 lbs. Fig. JJ is from the same engine, and is here intro-duced for the purpose of showing the great advantageresulting from a good vacuum. In fact the largestportion of the work in this case was done through thehelp of the vacuum, as indicated by much the largestportion of the area of the diagram being below theline of atmospheric pressure. The diagram wouldappear to be a kind of connecting link between the DTAGRAM ANALYSIS times of Watt and Newcomen, when the vacuum didall the work, and these modern times of high steampressure. The circumstances under which Fig. 77 was obtainedwere as follows: At certain times it became necessaryto run a part of the shops
Size: 2710px × 922px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpu, booksubjectsteamturbines
