4& BULLETIN 1067, U. S. DEPARTMENT OF AGRICULTURE. 
Table 34. — Test of pump No. 3 of drainaqe pumping plant at Port Arthur, Tex., made 
by W. P. Lang worthy July 23-26, 1918. 
Time. 
Speed. 
Average 
velocity 
of flow. 
Discharge. 
Head. 
Fuel 
used. 
Water 
pumped 
per gallon 
of fuel 
used. 
11.28J.... 
11.36 
B.p.m. 
250 
250 
Ft.persec. 
7.91 
7.84 
7.79 
7.80 
7.51 
7.29 
7.36 
7.27 
7.26 
7.21 
Sec. -ft. 
116." 75 
115. 41 
114.75 
112. 07 
110. 51 
107. 39 
108. 28 
107. 17 
107. 39 
106.95 
106.28 
G.p.m. 
52.400 
51,800 
51, 500 
50,300 
49.600 
48. 200 
48.600 
48. 100 
48,200 
48.000 
47.700 
Feet. 
3.00 
3. 38 
3.86 
3.96 
4.06 
4.19 
4.36 
4.63 : 
4.76 
4.90 
5.00 
G.p.m. 
0.160 
.157 
.166 
.173 
.174 
.178 
.194 
.174 
.183 
.184 
.163 
Gallons. 
327. 000 
330,000 
310, 000 
11.51 
249 
11.55 
246 
291.000 
11.59 
i 246 
285, 000 
12.03 
J 246 
271, 000 
12.07 
245 
250. 000 
12.15 . 
241 
276. 000 
263. 000 
261,000 
293.000 
12.19 
12.23 
12.27 
243 
1 244 
243 
TEST OF DRAINAGE PUMPING PLANT IN SUB-DISTRICT NO. 4, LAFOURCHE DRAINAGE 
DISTRICT NO. 12, RACELAND, LA. 
This plant, which, drains 4,466 acres of prairie land, was installed in 
1915. The machinery consists of two units, duplicates in every way 
except that the pumps are driven respectively by right-hand and 
left-hand engines. The pumps are 48-inch centrifugal drainage 
pumps designed for high speed and a flat power curve. The pump 
impellers are a combination of the screw propeller and the ordinary 
centrifugal pump impeller. Each pump has double-suction pipes 
attached to 48-inch elbows, and both suction and discharge pipes are 
enlarged at their outer ends. Wooden flap valves are used to cover 
the discharge ends while the pumps are being primed. 
The pumps are driven by 2-stroke cycle Diesel engines 14$ by 24 
inches, with variable speed governors. The plant is ordinarily oper- 
ated between the limits of 190 to 200 revolutions, while for maximum 
lift of about 9 feet the speed may be increased 220 revolutions per 
minute. 
A test of one of the units was made to determine the oil consump- 
tion for a given output of work. Observations were taken every 20 
minutes on the speed, lift, suction (with manometers), pounds of oil 
consumed, and quantity of water pumped. The fuel used during the 
test was crude oil, specific gravity 0.889, or 27.4° Baume at 60° F. 
The unit tested was situated on the left-hand side of the suction 
canal looking upstream. The two suction pipes are labeled right and 
left, as one stands facing the suction canal, and therefore the right- 
hand suction pump is near the middle of the canal. During the test 
an eddy was observed in the suction basin, so disposed that water was 
brought to the right-hand pipe and away from the opening of the left- 
hand suction pipe. The effect of the eddy was clearly shown in the 
quantities of water measured in the two pipes, as the right-hand 
pipe invariably carried more water. Without doubt this condition 
