102 



AIR COMPRESSORS 



SOLUTION. The internal dimensions of the reservoir (found 

 by subtracting 5 in. from diameter and 3 in. from the length) 

 are 26 in. in diameter by 93 in. long. The area of a 26-in. 

 reservoir is 503.93 sq. in.; therefore, its capacity is 503.93 

 X93 = 49,377 cu. in., say 49,400. 



The accompanying table gives the cross-sectional areas of 

 the standard sizes of main reservoirs as well as the special 

 sizes, 33, 34|, and 36| in. The areas were calculated after 

 subtracting f in. from the diameters, so that multiplying them 

 by the length of a reservoir, after subtracting 3 in. from its 

 length, will give the approximate capacity of the reservoir, in 

 cubic inches. 



CROSS-SECTIONAL AREAS OF AIR-BRAKE MAIN 

 RESERVOIRS 



