TESTS OF DRAINAGE PUMPIXG PLANTS. 
15 
Table 6. — Second test of Phillips Land Co. pumping plant, Aug. 11, 1916 — Contd. 
24-INCH UNIT. 
Time. 
Speed. 
Indi- 
cated 
horse- 
power. 
Actual 
lift. 
Discharge. 
Useful 
water 
horse- 
power. 
Efficiency 
of 
engine, 
pump, 
and 
piping. 
1 .35. . 
R.p. m. 
207 
206 
206 
244 
244 
198 
198 
199 
33.93 
32.78 
32.02 
50.73 
50.11 
26. 83 
26.85 
26.87 
Feet. 
6.25 
6.30 
6.34 
6.44 
6.45 
6.45 
6.45 
6.45 
Sec.-ft. 
26.20 
26.38 
25.94 
35. 27 
35.93 
. 21.40 
21.57 
20.72 
G.p.m. 
11,760 
11,830 
11,640 
15,830 
16, 140 
9,610 
9,680 
9,300 
18.55 
18.81 
18.62 
25.72 
26.23 
15.62 
15.72 
15.13 
Per cent. 
54.7 
1.43... . 
57.4 
1.45 
58.2 
2.00 
50.7 
2.05.. 
52.4 
2.15 
58.3 
2.20 
58.5 
2.25 
56.2 
Mean 
1 
203 
35.01 
6.39 
26.68 
11,974 
19.30 
55.8 
Table 7. — Comparison of the results of the two tests of the Phillips Land Co. plant. 
Unit. 
Lift. 
Rate of pumping. 
Efficiency of engine 
pump, and pipe. 
1912 
1916 
1912 
1916 
1912 
1916 
36-inch 
Feet. 
4.48 
4.48 
Feet. 
6.17 
6.39 
Sec.-ft. 
58.7 
27.5 
Sec.-ft. 
61.9 
26.7 
Per cent. 
33.2 
43.4 
Per cent. 
52.4 
24-inch 
55.8 
During the test different speeds were tried. Some of the varia- 
tions in efficiency are due to change of speed, but the superior effi- 
ciencies obtained in the second test bear witness to the great improve- 
ment of the pumping units resulting from the changes noted, for the 
test was made in the same manner and with the same instruments 
as the first test. 
TESTS OF PUMPING PLANT IN SUBDISTRICT NO. 1, LAFOURCHE DRAINAGE DISTRICT 
NO. 6, LAFOURCHE PARISH, LA. 
DESCRIPTION OF PLANT. 
This plant is used to drain a tract of land containing about 1,880 
acres. At the time of the first test the plant consisted of duplicate 
units, each having a 24-inch double-suction centrifugal pump driven 
by a 12 by 12 inch simple slide-valve engine. The suction openings 
on the pumps are 18 inches in diameter. The intake and suction 
pipes have been tapered and enlarged so that the area of the intake 
is 4.2 and the area of the discharge 2.7 times the area of the discharge 
nozzle of the pump. The pumps were direct connected to the 
engines by flexible couplings. The exhaust of the engines was con- 
ducted through a common pipe to a water heater and then exhausted 
into the air. Steam was generated by two horizontal marine-type 
boilers 7 feet in diameter by 13 feet long. Neither boilers nor steam 
line were covered during the test. The fuel used was Mexican crude 
oil. Steam was used to atomize the oil in the furnaces and to run the 
