TESTS OF DEAINAGE PUMPING PLANTS. 
23 
SECOND TEST. 
The results of the second test are given in Table 14. Although 
they appear to be quite consistent, the quantity of water entering 
the suction pipe on the engine side was about 50 per cent more than 
the quantity entering the other suction pipe. This is probably to be 
attributed to the fact that the end of the suction pipe which had the 
low capacity was close to the bottom of the canal. The same con- 
dition existed during the first test. The water used in the boiler test 
was measured by a Worthington piston meter. The amount of steam 
used per horsepower per hour for all purposes was 33.7 pounds. The 
fuel oil burned during the test was measured in a calibrated barrel. 
Table 14. — Second test of pumping plant in Jefferson drainage district No. 3, Lafttte, 
La., Dec. 13, 1913— Unit No. 2, 48-inch pump. 
Boiler 
pres- 
sure. 
Speed. 
Actual 
lift. 
Useful 
water 
horse- 
power. 
Efficiency. 1 
Horse- 
power 
indica- 
ted. 
Time. 
Discharge. 
Pump, 
piping, 
and 
engine. 
Pump 
and 
piping. 
12.00 
12.30 
1.00 
1.30 
2.00 
2.30 
3.00 
3.30 
4.00 
Lbs. per 
sq. in. 
100 
100 
100 
100 
100 
106 
100 
100 
100 
R. p. m. 
115 
118 
111 
113 
115 
117 
110 
108 
109 
Feet. 
2.80 
2.90 
2.90 
3.00 
3.10 
3.30 
3.45 
3.60 
3.80 
Sec.-ft. 
125.8 
130.5 
128.0 
130.8 
124. 6" 
127.2 
125.7 
121.4 
118.6 
G. p. m. 
55, 750 
58, 600 
57, 450 
58, 720 
55, 910 
57, 100 
56, 410 
54,480 
53, 250 
39.9 
42.8 
42.1 
44.5 
43.8 
47.5 
49.2 
49.6 
51.1 
Per cent. 
23.5 
22.3 
26.5 
25.6 
24.0 
28.2 
32.0 
33.9 
33.9 
Per cent. 
25.5 
24.1 
28.7 
27.9 
25.9 
30.4 
34.0 
36.6 
36.6 
170.0 
192.9 
159.0 
173.7 
182.8 
168.6 
153.7 
146.5 
151.0 
Mean 
100.7 
112 
3.20 
125.8 
56, 480 
45.6 
27.8 
30.0 
166.5 
Mechanical efficiency of engine shown by friction cards to be 92.5 per cent. 
THIRD TEST. 
Nearly three years after the second test a third test was run, this 
time on No. 1 unit. The useful lift, or actual head, varied from 6.04 
to 6.5 feet. The results are given in Table 15. 
Table 15. — Third test of pumping plant in Jefferson drainage district No. 3, Lafitte, 
La., Aug. 14, 1916 — Unit No. 1, 48-inch pump. 
Speed. 
Indica- 
ted 
horse- 
power. 
Actual 
lift. 
Useful 
water 
horse- 
power. 
Efficiency. 
Time. 
Discharge. 
Engine 
and 
pump. 
Pump. 1 
11.15 
R. p. m. 
116 
116 
117 
116 
116 
118 
118 
117 
118 
118 
112 
112 
114 
161.7 
165.9 
173. 7 
Feet. 
6.04 
Sec.-ft. 
110.89 
G. p. m. 
48, 900 
75.9 
Per cent. 
46.9 
Per cent. 
1.50.7 
11.20 
11.25 
6.10 
il7. 29 
49,000 
81.2 
46.7 
50.5 
11.30 
11.35 
168.9 
171.8 
172.3 
171.0 
165.7 
167.4 
136.9 
138. 4 
152.4 
11.40 
6.34 
113.86 
52,600 
81.8 
47.7 
51.5 
11.45 
11.50 
6.40 
109. 02 
49,000 
79.2 
46.3 
50.1 
11.55 
12.00 
12.10 
6.50 
94.59 
42,900 
69.6 
50.8 
55.0 
12.15 
12.20 
1 Engine efficiency at 92.5 per cent. 
