208 



HYDRAULIC EQUIPMENT 



R.P.M. of the single-runner turbine. It is also readily seen that 

 for a given value of R.P.M. and h, the H.P. output is propor- 



Speciflc Speed 



SPECIFIC SPEED CHART 



DIRECTIONS: 



Given Head, R.P.M. and H.P. 

 Runner; project vertically, Point of 

 Intersection between Horizontal Head 

 Line and Diagonal H.P. Line in Lower 

 Diagram to Horizontal K.P.M. Line 

 in Upper Diagram. Diagonal Line pass- 

 ing thru this Point indicates Specific 

 Speed of Runner. 

 EXAMPLE: 



Given: Head=72 ft; R.P.M.= 178; 

 H.P. = 5000; from Chart, required 



Horse Power 



FIG. 107. Specific Speed Chart. 

 (By Courtesy of Wellman-Seaver-M organ Company). 



tional to the square of the specific speed, and also that for a given 

 head and H.P. tfce R.P.M. of a turbine is proportional to the spe- 

 cific speed. 



