32 



BULLETIN/ 495, U. S. DEPARTMENT OF AGRICULTURE. 



certain amount of pipe which will give a desired length when screwed 

 together. Pipe less than 2 inches in diameter can be cut in the field, 

 hence the actual number of feet required is stated for such pipe. 

 " Location ■' refers to the location in the field. Nozzle lines are as- 

 sumed to be 630 feet long on each side of the farm road. Pipe posts 

 are assumed to be set 18 feet apart, and 9 feet long, to support nozzle 

 lines 6i feet above the surface. 



Table 4. — Bill of materials. 



Amount. 



Size. 



Item. 



Location. 



1 run, 410 feet 



Inches. 



. 6 



6 

 6 

 2 



2 

 2 



li 



li 



1 

 a 



4 



6by2by2 

 6 by 2 

 2 

 2 

 2 

 2 by li 

 li by 1J 

 libyl 

 lbyj 

 2 

 I 

 6 

 2 

 No.—. 

 No.—. 



Black guaranteed wrought-iron 

 pipe, cut to exact length, with 

 allowance for 1 tee in each run. 



do 



Main feed pipe. 

 Do. 







do 



Do. 



20 runs, 30 feet each. . . 



20 pieces, 7 feet each 



7 pieces, 15 feet each 



3,500 feet 



Galvanized wrought-steel pipe 



do 



Feed end east-and-west nozzle, 

 lines. 



do 



Pipe under road, east-and-west 

 Lines. 

 Do. 



do 



3,500 feet 



....do 



Do. 



3,200 feet 



do 



Do. 



1,800 feet 



do 





700 pieces, 9 feet each . . . 

 7 



Galvanized wrought-steel pipe, 



plain ends. 

 Black side outlet cast-iron tees 



Pipe posts. 



Main feed pipe. 

 Do. 



6... 





Black malleable 90 ells 





20 



Galvanized malleable 90 ells 



Top east-and-west risers. 



20... 



20 



Galvanized reducing sockets 



do 





20 .. 



Do. 



20... 



do 



Do. 



20... 



do 



Do. 



20 



Standard brass gate valves 



do 





20 





1 



Standard iron-body gate valve 



Trade name, etc., turning unions.. 





20 





3,160 



Do. 



700 



Trade name, etc. , galvanized hang- 

 ers. 



Top of posts. 





Note. — Main feed pipe is made 6-inch size full length, as full head of water is to be pumped to farther 

 fields for surface irrigation. 



THE DESIGNING OF PUMPING PLANT. 



As in the designing of the field system, the farmer should ob- 

 tain all possible assistance in designing a suitable pumping equip- 

 ment. It is desirable to purchase machinery for which repairs can 

 be obtained readily from a local representative, yet when the services 

 of an irrigation engineer are not obtainable the farmer should submit 

 all possible data regarding the conditions the plant must fill to 

 several reliable pump manufacturers for recommendations and quo- 

 tations. A suitable request for the pump alone or a complete outfit 

 including engine or motor for this purpose may be submitted in the 

 following form : 



Gentlemen : 



You are requested to submit recommendations and bids on pumping equip- 

 ment for spray irrigation purposes to fill the conditions outlined below. Prices 

 should be quoted on (pump, engine, motor) delivered at 



