APPENDIX. 



63 



B. TABLES FOR DETERMINING THE SIZE OF PUMP REQUIRED FOR 

 DELIVERING WATER/ 



Loss in Friction Head. 



Water required per minute. 



Friction head in 2-inch pipe— 



20 gallons 

 30 gallons 

 40 gallons 

 50 gallons 

 60 gallons 



1 mile. 2 miles. 3 miles. 4 mil( 



Feet. 

 51 

 110 

 194 

 298 



Feet. 

 102 



220 

 388 

 592 

 936 



Feet. 

 153 

 330 



582 



888 



1,404 



Feci. 



204 



440 



776 



1,184 



1,872 



1 From an article by Clyde E. Learned, Highway Engineer, Bureau of Public Roads, published in Public 

 Roads, June, 1919. 



To the loss iu head in the above table it will be necessary to add the 

 vertical height that the water is to be pumped and to make allowance for 

 angles and valves. 



The theoretical horsepower required to furnish water under different heads 

 is given in the following table: 



Theoretical Horsepower Required. 



Water required per mmute. 



Total head.i 



100 

 feet. 



200 

 feet. 



300 

 feet. 



400 

 feet. 



500 

 feet. 



600 

 feet. 



20 gallons 

 30 gallons 

 40 gallons 

 50 gallons 

 60 gallons 



Horse- 

 power. 

 0.50 

 0.75 

 1.00 

 1.25 

 1.50 



Horse- 

 power. 

 1.00 

 1.50 

 2.00 

 2.50 

 3.00 



Horse- 

 power. 

 1.50 

 2.25 

 3.00 

 3.75 

 4.50 



Horse- 

 power. 

 2.00 

 3.00 

 4.00 

 5.00 

 6.00 



Horse- 

 power. 

 2.50 

 3.75 

 5.00 

 6.25 

 7.50 



Horse- 

 power. 

 3.00 

 4.50 

 6.00 

 7.50 

 9.00 



I Total head required equals friction head, plus height to be raised, plus loss of head in valves, elbows, 

 etc. 



Multiply the theoretical horsepower by 4 for deliveries of 30 gallons per 

 minute or less and by 3 for deliveries of from 30 to 125 gallons per minute. 



Example. — Required, 40 gallons per minute ; maximum distance to be 

 pumped, 2 miles up a hill 100 feet in height. 

 From first table : Feet 



Loss in head in pipe line 388 



Vertical height up hill 100 



Estimated loss of head in valves, elbows, etc 20 



Total head 508 



From second table : Horsepower. 



Theoretical horsepower required 5 



Actual horsepower required for engine and pump, three times 

 theoretical horsepower ,_^_^__^, . _ — ., — . 15 



