12 



BULLETIN 906, U. S. DEPARTMENT OF AGRICULTURE. 



ure in the yard. There are several types of apparatus designed by 

 engineers of this bureau which can be used by pipe manufacturers 

 for such purposes. In fact all pipe yards should be equipped with 

 testing apparatus that can test pipe for an installation. A farmer 

 should demand tests on pipe that he is ordering especially for high- 

 pressure lines. 



As regards durability, concrete pipe, if well made and laid, should 

 last for generations. It is the improperly made pipe which causes 

 failures and early renewal. The experience of southern California 

 shows that the good concrete pipe installed 30 years ago is still in 

 excellent condition, whereas some of the inferior, pipe has been re- 

 newed in less than 5 years after laving. 



COST OF UNREINF0RCED CONCRETE PIPE. 



The price of concrete pipe has increased somewhat during the last 

 two or three years, but the increase has been less than in other types 

 of pipe. The following prices were quoted in July, 1919, by a num- 

 ber of the larger manufacturers in southern California. 



Inside diameter 

 of pipe. 



Price per 

 foot at 

 yard. 



Price per 



foot laid 



in light 



soil. 



Price per 



foot laid 



in heavy 



soil. 



Inside diameter 

 of pipe. 



Price per 

 foot at 

 yard. 



Price per 



foot laid 



in light 



soil. 



Price per 



foot laid 



in heavy 



soil. 





$0. 12* 

 .14 

 .16 

 .20 

 .25 

 .35 



SO. 25 

 .27 

 .30 

 .34 

 .40 

 .52 



SO. 28 



.30 

 .34 



.38 

 .44 

 .60 





$0.46 



.70 



.90 



1.60 



2.00 



SO. 65 

 1.00 



SO. 85 







.150 





































Note. — Prices laid, include trenching and backfilling. 



Prices quoted at the yard by the Concrete Pipe Manufacturers' As- 

 sociation of Northern and Central California July, 1919, are as fol- 

 lows: 



Inside diameter of pipe. 



Price per 

 foot. 



Inside diameter of pipe. 



Price per 

 foot. 





SO. 20 

 .22 

 .28 

 .35 



.46 

 .70 





$0.72 







.85 







1.20 







1.90 







2.50 













Some firms quote prices for pipe that will stand extra pressure, and 

 guarantee the product. The cost of this pipe is about 30 per cent 

 higher than stock pipe for 40-foot heads, and about 50 per cent higher 

 for 50-foot heads. One firm makes pressure pipe of standard thick- 

 ness from 6 to 12 inches in diameter that will stand 70 to 80 feet head, 

 and sells it at a price 25 to 40 per cent higher than the ordinary low- 



