WATER SUPPLY, PLUMBING, ETC., FOR COUNTRY HOMES. 21 



drawn from faucets with the pump under working -pressures varying 

 from 25 to 65 pounds and total starting pressures in a 1,000-gallon 

 ail' tank varjdng from 40 to 100 pounds: 



Pumping capacity of a 1 ,000-gallon air tank, in gallons, under varying internal pressures. 



Work , 

 pressure 

 on pump 



guage. 



Total pressure in air tank at start. 



40 pounds. 



50 pounds. 



60 pounds. 



70 pounds. 



80 pounds. 



90 pounds. 



100 pounds. 



Pounds. 



25 



30 



- 35 



40 

 45 

 50 

 55 

 60 

 65 



Gallons. 

 375 

 221 

 102 



Gallons. 

 259 

 442 

 306 

 187 



Gallons. 

 833 

 663 

 510 

 374 

 255 

 153 

 68 



Gallons. 

 1,075 

 884 

 714 

 561 

 425 

 306 

 204 

 119 

 51 



Gallons. 

 1,310 

 1,105 

 924 

 748 

 596 

 460 

 330 

 237 

 153 



Gallons. 



1,548 



1,326 



1,123 



936 



765 



612 



476 



375 



255 



Gallons. 



1,786 



1,548 



1,327 



1,123 



936 



765 



612 



476 



357 





85 





[ 



















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AUTOPNEUMATIC PUMP II IB" AUTOPfJEUMATIC PUMP 



Pig. 18.— Application of autopneumatic system to a farm liome. 



For an* tanks of other than 1,000-gallon capacity divide the figures 

 hi the table by 1,000, move the decimal point three places to the left, 

 and multiply the result by the capacity of the tank in gallons. 



Assume, for example, that the height to which the water is to be 

 raised and the pressure required to operate the pump, including 

 friction, make necessary a working pressure of 40 pounds on the 

 pump. Then if the initial pressure in the air tank is 50 pounds, 187 

 gallons of water can be delivered at the faucets before the pressure m 

 the air tank becomes too low to operate the pump. 



The autopneumatic pump can be used in wells, springs, or lakes 

 where the water is free from sand and mud and does not have to be 



