74 



B01LEE TESTS. 



BOILER No. 3, LONGITUDINAL SECTION. 



Dimensions of Boiler No. 3. 



Diameter of each shell, . 



Length between heads and length of tubes, . 



Number of tubes ( collective ) 3 inches outside diameter, 



Area of water-heating surface, 



Area of steam-heating surface, 



Area of grate surface, . . . . 



Area through tubes, ....... 



Area through chimney, 



Height of chimney, ....... 



Katio of water-heating surface to grate, 

 Ratio of steam-heating surface to grate, 

 Ratio of grate to tube area, 



48 



15 



288 



4,056 



540 



120 



in. 

 ft. 



sq. ft. 

 sq. ft. 

 sq. ft. 

 11.9 sq. ft. 

 11.1 sq. ft. 

 100 ft. 

 33.8 to 1 

 4.5 to 1 

 10.1 to 1 



Results of Test. ( Average of three. ) Boiler No. 3. 



Test No. 5 

 Ordinary. 



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



Duration, . . . 12 hrs. 



Coal fired ( including wood equivalent ), .... 16,003 Ibs. 



Percentage of ash ( including some unburned coal ), . . 16.7 



Water evaporated, . . . 136,034 Ibs. 



Coal per hour, 1,333.6 Ibs. 



Coal per hour per square foot of grate, . 11.11 Ibs. 



"Water per hour, 11,336.1 Ibs. 



Water per hour per square foot of water-heating surface, . 2.79 Ibs. 



Horse-power developed, . . . . . . . 345 



Boiler pressure . 84.6 Ibs. 



Temperature of feed-water, 198.6 deg. 



Temperature of escaping gases, 482 deg. 



Water per pound of coal, 8.50 Ibs. 



Water per pound of coal from and at 212 degrees, . . 8.96 Ibs. 



Water per pound of combustible from at 212 degrees, . 10.73 Ibs. 



The test on Boiler No. 3 may be regarded as typical of the 

 work done by a large plant of boilers, using anthracite coal, 



