118 



WATER CONDUCTORS AND ACCESSORIES 



TABLE XXXI 



FRICTION FACTORS FOR CLEAN IRON PIPES 



Table XXXII 1 gives the loss in head in each 100 feet of 

 riveted steel pipe for diameters from 2 to 12 feet and for veloci- 

 ties up to 12 feet per second. 



Loss of Head in Bends. This may be obtained from the 

 formula: 



where f\ is the curve factor. The values for the same, given in 

 the following, were determined by Williams, Hubbell and Fen- 

 kell by experiments made on a 30-inch cast-iron water main, 

 with 90 deg. bends. 



Let R be the radius of the circle in which the center line of 

 the pipe is laid and d the diameter, then: 



For | = 24 16 10 6 4 2.4 



/i = 0.036 0.037 0.047 0.060 0.062 0.072 

 1 S. Morgan Smith Co.'s Bulletin No. 104. 



