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 OF TEST. 
In acceptance test made at this plant, the quantity of water was 
measured by means of Pi tot 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. 
Actual 
lift. 
Discharge. 
Oil ! used Discharge 
per 20 per gallon 
minutes. of oil. 
11.10 
R. p. TO. 
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 
46.9 
43.7 
43.1 
42.1 
41.1 
G. p. TO. 
21, 900 
19, ISO 
21, 800 
21, 000 
19,600 
19, 300 
18, 830 
18, 400 
Pounds. 
14.31 
13.19 
13. 19 
12.31 
12.75 
12.37 
12.75 
12.94 
Cubic feet. 
28, 000 
11.30 
26,500 
30, 200 
31, 050 
11.50 
12.10 
12.30 
28,000 
28,450 
26, 950 
12.50 
1.10 
1.30 
25.900 
Mean 
176.2 
4.98 
44.7 
20,060 
12.98 28.130 
1 Distillate of 42.3° Baum6; 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 
