WATER SUPPLY 



373 



Friction of Water in Pipes 



friction lost in pounds pressure per square inch, for each 



ioo feet of length in different size clean iron pipes, 



discharging given quantities per minute 



Sizes, Weights, and Costs of Standard Iron Pipe 



Diameter 



Nomina) 

 Inside 



Inches 



Vs 



l A 



Vs 



l A 



% 



1 



iH 



iH 



2 



2V 2 



3 



33^ 



4 



4 l A 



5 



6 



Actual 

 Outside 



Inches 

 O.405 



0-54 

 0.675 



0.84 



1.05 



1 315 



1.66 



1.9 



2-375 



2.875 



3-5 

 4.0 



4-5 

 50 



5-563 

 6.625 



Weight 

 per Foot 



Pounds 

 O.246 

 O.426 

 O.570 



O.855 



I . 140 



I .690 



2.290 



2.740 



3.690 



5.850 



7.660 



9.24O 



IO.900 



12.700 



14.900 



I9.200 



Net Cost per 100 Feet 



Black 



$i-77 

 1-93 

 1-93 

 2.40 

 2.90 

 4.28 

 5.80 



6-93 

 9-32 



14-74 

 19.28 



24. 10 



28.56 



33-27 

 38.78 

 50 30 



Galvanized 



$2 



3 



3 



3 



3 



5 



7 



9 



12 



20 



26 



32 



38 



44 



52 



67 



93 

 19 

 19 



33 



93 



81 



87 



41 



65 

 01 



16 



38 



37 

 70 



10 



58 



