Steam power plants, their design and construction . 6 5 7 56 4 38 11x15 6 5 7y4 58 4 40 11x15 6 5 7% 60 4 47 11 xl5 6 5 8 62 4 49 11x15 6 5 8Vi 64 4 51 11 xl5 6 5 s% 66 4 56 11x15 6 5 9 68 4 62 11 xl5 6 5 9ya 70 4 64 11 xl5 6 5 9% 72 4 74 11 xl5 6 5 101/4 10 to 1210 to 1210 to 1210 to 1210 to 1210 to 1210 to 1212 to 1412 to 1412 to 1412 to 1412 to 1412 to 1414 to 1614 to 1614 to 1614 to 1616 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 20 ting. Figue 9 shows this con
Steam power plants, their design and construction . 6 5 7 56 4 38 11x15 6 5 7y4 58 4 40 11x15 6 5 7% 60 4 47 11 xl5 6 5 8 62 4 49 11x15 6 5 8Vi 64 4 51 11 xl5 6 5 s% 66 4 56 11x15 6 5 9 68 4 62 11 xl5 6 5 9ya 70 4 64 11 xl5 6 5 9% 72 4 74 11 xl5 6 5 101/4 10 to 1210 to 1210 to 1210 to 1210 to 1210 to 1210 to 1212 to 1412 to 1412 to 1412 to 1412 to 1412 to 1414 to 1614 to 1614 to 1614 to 1616 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 2016 to 20 ting. Figue 9 shows this construction. This is one of the bestmethods. If it is used it is well to have an iron plate of generoussize between the beams and the setting for the former to restupon. Tubes.—Tubes should not be so closely spaced in a boiler as tointerfere with a proper circulation of water in them. Three, y/2and 4-inch tubes are commonly used in horizontal tubular boilers. the last bein; generally used in large-size boilers, the size de- STEAM POWER PLANTS. 27. Figure 10. creasing with the diameter of the boiler. Barrus states that acertain ratio of tube area to grate surface is necessary to give the best result with different fuels,a ratio of nine to one or ten toone being proper for anthracitecoals and six to one or sevento one for bituminous coals,the difference being due to thelarge volume of gases with bit-uminous coals, which requiresa large area in the tubes to passthe gases at the proper velocityfor giving off their should be placed in ver-tical rows and not should be located as farapart as the number necessaryto put in the boiler will permit;lor this will permit a bettercirculation, which is essen-tial when the boiler is oper-ating at high rates of combus-tion. By means of Table I. and Figures lo, ii and 12 the proper method of locating and spacing tubes in return tubular boilers may be found. The three figures refer respectively to 60-inch boilers with 3,
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