158 



BOILER TESTS. 



BOILER No 40, LONGITUDINAL SECTION 

 Dimensions of Boiler No. 40. 



Diameter of shell, 



Length between heads and length of tubes, . 



Number of tubes, 3J inches outside diameter, 



Area of heating surface, ....... 



Area of grate surface, 



in. 



ft. 



60 

 17 

 76 



1,262 sq 

 23.7 sq 



ft. 

 ft. 



Area through tubes, . 4.4 sq. ft. 



Width of air spaces and metal bars in grates, . Air 1-2 in., metal 3-8 in. 



Distance of grate to shell, 24 in. 



Distance of flat bridge to shell, 9 in. 



Ratio of heating surface to grate surface, . . . . 53.1 to 1 

 Ratio of grate surface to tube area, . . . . . 5.4 to 1 



Results of Test, Boiler No. 40. 



Test No. si. 



Manner of start and stop, . . . .{ Ordinary with preliminary 



Kind of run, Continuous. 



Duration, 9.7 hrs. 



Coal per hour, 3,149 Ibs. 



Percentage of ash, .7.5 per cent. 



Water evaporated, 34,116 Ibs. 



Coal per hour, 323 Ibs 



Coal per hour per square foot of grate, .... 13.6 Ibs. 



Water per hour, 3,499.4 Ibs. 



Water per hour per square foot of heating surface, . .2.8 Ibs. 



Horse-power developed, ....... 108.1 H. P. 



Boiler pressure, 61.7 Ibs. 



Temperature of feed-water, 178.7 deg. 



Temperature of escaping gases, ..... 413 deg. 



Draught suction, O.lc in. 



Water per pound of coal, 10.83 Ibs. 



Water per pound of coal from and at 212 degrees, . 11.54 Ibs. 



Water per pound of combustible from and at 212 d agrees, 12.47 Ibs. 



