HYDRAULICS 



379 



in transportation, and in laying will lead to their use in cases 

 where iron and steel are precluded on account of their cost. 

 Other advantages of wooden pipes are that they are free from 

 tuberculation, and have a tendency to wear even smoother 

 than when first made. On this account, the flow may be com- 

 puted by using for the coefficient /the values applying to smooth 

 iron pipe; it may be safely assumed that this value will hold, 

 even when the pipes become old, provided, however, that the 

 velocity of flow in the pipe is at least 2 ft. per sec., so that no 

 fungous growths can form. 



Formulas for Stave Pipes. The following formulas may be 

 used in the design of wooden-stave pipes: 

 D+2t 



and 



d = 



65(D+20 2 



16(pD+20Qt) 



in both of which d is the diameter of bands, in inches; D, the 

 inside diameter of pipe, in inches; t, the thickness of pipe, in 



DIMENSIONS OF PIPE STAVES 



(Recommended by A. L. Adams) 



inches; p, the water pressure in pipe, in pounds per square 

 inch; and s, the distance between bands, in inches. 



