BOILER No. 44. 169 



Dimensions of Boiler No. 44. 

 Diameter of lower shell, . . . . . . . 54 in. 



Diameter of upper shell, . . 32 in. 



Length of shells and tubes, . 12 ft. 



Number of tubes ( collective ) 3 inches outside diameter, . 472 



Area of water-heating surface, .... 4,972 sq. ft. 



Area of steam-heating surface, ...... 320 sq. ft. 



Area through tubes, . . . 19.5 sq. ft. 



Area of grate surface, ........ 80 sq. ft. 



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



Ratio of water-heating surface to grate surface, . . . 62.1 to 1 

 Ratio of steam-heating surface to grate surface, . . 4 to 1 



Ratio of grate to tube area, . . . . . . . 4.1 to 1 



Results of Tests, Boiler No. 44. (Average of two.) 



Test No. 89. 

 Manner of start and stop and kind of run, .... Ordinary. 



Duration, 12.25 hrs. 



Coal consumed, dry ( including wood equivalent ), . 9,000 Ibs. 



Percentage of ash, 9.7 per cent. 



Water evaporated, 92,355 Ibs. 



Coal per hour, 741.8 Ibs. 



Coal per hour per square foot of grate, 9.3 Ibs. 



Water per hour, 7,539.2 Ibs. 



Water per hour per square foot of water heating surf ace, . 1.5 Ibs. 



Horse-power developed, ....... 231.4 H. P. 



Boiler pressure, 82 Ibs. 



Temperature of feed-water, 190 deg. 



Temperature of escaping gases, . . . . . 375 deg. 



Water per pound of coal, 10.26 Ibs. 



Water per pound of coal from and at 212 degrees, . . 10.86 Ibs. 

 Water per pound of combustible from and at 212 degrees, . 12.03 Ibs. 



The economical result obtained on Boiler No. 44 exceeds 12 

 pounds of water from and at 212 degrees per pound of com- 

 bustible. This is a creditable performance, though it is no 

 higher than that given by many boilers of the ordinary hori- 

 zontal tubular type, a fact which shows that some of the heat- 

 ing surface in this form of boiler fails to be utilized. 



Boiler No. 45. 



Kind of boiler, " Double deck " hor. ret. tub. 



Number used, One. 



Horse-power ( basis 15 square feet), . One hundred and fifty. 



Kind of ooal / Delaware and Lackawanna 



\ anthracite, broken. 

 Age, New. 



