TESTS OF DRAINAGE PUMPING PLANTS. 
35 
Table 26. — Test of pumping plant in subdistrict No. 1 of Lafourche drainage district 
No. 12, Raceland, La., Nov. 22, 1913. 
Time. Speed. 
Indi- 
cated 
horse- 
power. 
Actual 
lift. 
Water 
horse- 
power. 
Efficiency. 1 
Fuel 
used per 
1 
2 
one-half 
hour. 
R. p. m. 
8.45 205 31.4 
Feet. 
2.18 
2.25 
2.47 
2.73 
3.05 
3.29 
3.54 
3.82 
4.12 
Sec.-ft. 
36.44 
35.78 
34.49 
34.36 
33.62 
33.15 
33.64 
32.82 
31.46 
G. p. m. 
16, 370 
16,060 
15, 445 
15,430 
15,100 
14,885 
15, 110 
14, 740 
14, 120 
8.97 
9.14 
9.60 
10.45 
11.70 
12.41 
13.52 
14.22 
14.65 
Per cent. 
28.6 
26.9 
29.8 
31.6 
34.3 
35.0 
39.2 
40.3 
40.8 
Per cent. 
35.7 
Pounds. 
9.15 206 | 34.0 
9.45 201 I 32.2 
10.15 206 33.8 
10.45 204 | 34.1 
11.15 205 1 34.5 
11.45 210 34.5 
12.15 212 , 35.4 
12.45 215 1 35.9 
33.6 
37.2 
39.5 
42.8 
43.7 
49.0 
50.5 
51.0 
11.00 
10.44 
20.31 
10.56 
13.75 
13.62 
13.00 
12.87 
Mean. . 207 
1 
34.0 
3.05 
33.97 
15,245 
11.52 
34.1 
42.6 13.19 
1 Efficiency: (1) Efficiency of pump, piping, and engine. (2) Efficiency of pump and piping, assuming 
mechanical efficiency of engine to be 80 per cent. 
TEST OF PUMPING PLANT IN SUBDISTRICT NO. 2 OF LAFOURCHE DRAINAGE 
DISTRICT NO. 12, RACELAND, LA. 
This pumping plant contains two units similar to those at Kace- 
land subdistrict No. 1 and similar methods of testing were used. 
The pumps and accessories are practically the same, but the engines, 
while of the same type and make as those in the previously described 
plant, have a cylinder diameter of 15 inches with 24-inch stroke. 
The pumps are 24-inch drainage pumps of the centrifugal type. 
The behavior of the engine in this test was doubtless affected by the 
presence of some Mexican crude oil w-hich had been put in the tank 
more than a year before. 
The indicator cards, when taken for several cycles, showed two 
different areas: One area was the regular card, while the other 
showed a rise in the compression line earlier than in the large card 
and no great increase of pressure at the end of compression, but a 
gradual rise of pressure as expansion proceeded until at exhaust 
opening the pressure was about the same as for the large card. 
There was no accurate way to determine how often either of these 
cards occurred. The evidence from a great many cards showed that 
the numbers of large and small cards were about equal, but this 
was too uncertain to make the indicated horsepower reliable enough 
to compute pump efficiency. Owing to the behavior of the engine 
the speed of pump was quite variable. Table 27 gives the results 
obtained. 
