AUXILIARY RESERVOIRS 349 



AUXILIARY, SUPPLEMENTARY, AND 

 EQUALIZING RESERVOIRS 



AUXILIARY RESERVOIRS 



The auxiliary reservoirs and brake cylinders with which 

 they are used, according to the accompanying table, are so 

 proportioned that an equalization pressure of 50 Ib. will, be 

 obtained from 70 Ib. auxiliary-reservoir pressure with 8-in. 

 piston travel for tender and passenger-car equipments, and 

 with 6-in. piston travel for truck-brake equipments. Driver- 

 brake equipment ordinarily includes two cylinders and one 

 reservoir of sizes given in table. When a single 18-in. driver- 

 brake cylinder is used, a 16"X42" auxiliary reservoir should 

 be used instead of 16"X48". Standard freight-brake equip- 

 ments include standard cast-iron auxiliary reservoirs, either 

 detached or combined. Auxiliary reservoirs are tapped for 

 j-in. pipe in one end; $-in. pipe in other end; and (for drain- 

 age) in center of shell, J-in. pipe in reservoirs of 14-in. diam- 

 eter or less, and j-in. pipe in reservoirs of 16-in. diameter or 

 greater. 



SUPPLEMENTARY RESERVOIRS 



Supplementary reservoirs 16 in. in diameter or less are tapped 

 for J-in. pipe in one end and $-in. pipe in other end; reservoirs 

 over 16 in. in diameter are tapped for } in. pipe in both ends. 

 For drainage in center of shell, reservoirs 14 in. in diameter and 

 less are tapped for i-in. pipe and reservoirs of 16 in. in diameter 

 or greater are tapped for i-in. pipe. When one supplementary 

 reservoir per car is used, the sizes given in the accompanying 

 table rhould be specified. 



If desirable or convenient, for any reason, two supplement- 

 ary reservoirs may be used in which event two reservoirs of 

 proper size, as indicated in the accompanying table, should be 

 specified. 



