30 



BULLETIN 1067, U. S. DEPARTMENT OF AGRICULTURE. 



The suction and discharge pipes on the main pumps are shown in 

 figure 3. These pipes are one-fourth inch riveted steel of such size 

 and design as to reduce the. loss of head to about 0.5 foot. This is 

 done by a design of the cross-section of the straight pipe which so 

 reduces the velocity that the friction loss is only 0.25 foot, and by 

 using long taper increasers and liberal bell mouths to reduce the loss 

 due to velocity head. These calculations were made for a normal 

 working head of 4 to 5 feet. 



DESCRIPTION OP TEST. 



In acceptance test made at this plant, the quantity of water was 

 measured by means of Pitot tubes in the suction pipes. The lift 

 was determined by reading gages in the suction and discharge basins. 

 The fuel was a distillate oil of 42.3° Baume weighing 6.81 pounds 

 per gallon. The results of the test are given in Table 21. 



Table 21. — Test of 30-inch drainage unit No. 2 of the pumping plant in subdistrict No. 4, 

 Jefferson drainage district No. 4, Jefferson Parish, La., Sept. 20, 1916. 



Time. 



Speed. 



Aetua! 

 lift. 



Discharge. 



Oil i used Discharge 

 per 20 per gallon 

 minutes. of oil. 



11.10 



R. p. m. 

 179.6 

 171.9 

 175.4 

 174.9 

 174.8 

 177.0 

 177.1 

 178.6 



Feet. 

 4.44 

 4.58 

 4.61 

 4.69 

 4.94 

 5.17 

 5.49 

 5.91 



Sec.-ft. 

 49.1 

 42.8 

 48.7 

 4S.9 

 43.7 

 43.1 

 42.1 

 41.1 



G. p. m. 



21, 900 

 19, ISO 

 21, 800 

 21, 000 

 19, 600 

 19, 300 

 18, 830 

 18, 400 



Pouvds. 

 14.31 

 13.19 

 13.19 

 12.31 

 12.75 

 12.37 

 12. 75 



Cubic feet. 

 28, 000 



11 .30 



26,500 



11.50 



30, 200 



12.10 



31, 050 



12.30 



28,000 



12.50 



28, 450 



1.10 



26. 950 



1.30 



12.94 ' 25,900 









176.2 



4.98 



44.7 



20, 060 



12. 98 



28, 130 







1 Distillate of 42.3° Baume; 6.81 pounds per gallon. 



TEST OF PUMPING PLANT IN SUBDISTRICT NO. 1, LAFOURCHE DRAINAGE DISTRICT 



NO. 9, FAYPORT, LA. 



DESCRIPTION OF PLANT. 



This pumping plant drains 2,000 acres. The equipment consists 

 of two 30-inch centrifugal drainage pumps, each driven by a kerosene 

 engine of 50-horsepower rating with pistons 16 inches in diameter 

 and the stroke 18 inches. The engines are supposed to run at about 

 190 revolutions per minute, but ordinarily run at a slower speed. 

 Water is injected with the kerosene. Air tanks are provided for 

 starting, and a small air compressor may be used in charging the 

 tanks. Circulating pumps are belted to the engines. 



DESCRIPTION OF TEST. 



The test on one unit of this plant was made with the plant operating 

 at from 169 to 182 revolutions per minute. The lift and the quantity 

 of water pumped were measured in the usual manner. The amount 



