20 
BULLETIX 1067, IT. S. DEPAETAEEXT OF AGRICULTURE. 
the useful water horsepower. The indicated horsepower of the 
engines and the total head on the pump were then obtained in the 
usual manner. The loss of velocity head due to lack of proper 
enlarging of the ends of the pipes is quite plainly shown. As this 
loss varies with the square of the velocity of the water, it is greatest 
when the pump is working at maximum capacity. 
The water used during the boiler test was measured by means of a 
Worthington piston-type water meter, afterwards calibrated. The 
steam used for all purposes per horsepower per hour was 54.91 
pounds. Table 12 shows the results of the test. 
Table 12. — Test of pumpinq plant in subdistrict Xo. S. Lafourche drainage district 
Xo. It, RaceJand. La., ^ov. 14. 1913. 
UNIT NO. 1. 
Time. 
Boiler 
pres- 
Speed. 
Indi- 
cated 
horse- 
Actual 
lift. 
Head 
on 
Discharge. 
Useful 
water 
horse- 
Efficiencies 
- 1 
sure. 
power. 
pump. 
power. 
1 
2 
3 
E. p. m. 
Feet. 
Feet. 
Sec.-ft. 
G. p. 777. 
Per ct. 
Per ct. 
Per ct. 
9.00 
100 
142 
4S.4 
1.45 
2.17 
58. IS 
26,100 
9.57 
20.0 
22.2 
33.2 
9.30 
104 
143 
48.4 
1.70 
2.67 
5S.2S 
26,160 
11.25 
23.2 
25.8 
40.5 
10.00 
101 
140 
46.2 
1.95 
2.68 
54.89 
24.630 
12.14 
26.3 
29.2 
40.1 
10.30 
102 
144 
48.9 
2.20 
2.76 
54. S4 
24,610 
13.69 
28.0 
31.1 
39.0 
11.00 
103 
144 
46.8 
2.40 
2.98 
54.16 
24.290 
14.76 
31.5 
35.0 
43.5 
11.30 
103 
147 
49.8 
2.75 
3.32 
54.11 
24. 2S0 
16.89 
33.9 
37.7 ' 
45.5 
12.00 
108 
146 
49.1 
3.00 
3.74 
51.60 
23,150 
17.57 
35.8 
39.8 
49.5 
12-30 
104 
142 
48.1 
3.35 
4.23 
49.44 
22,200 
18.80 
39.1 
43.4 
55.0 
1.00 
84 
134 
39.8 
3.62 
4.20 
42.13 
IS, 910 
17.31 
43.6 
48.4 : 
56.2 
Average.. 
100. S 
142.3 
47.3 
2.39 
3.19 
53.07 
23,830 
14. 55 
UNIT NO. 2. 
9.00 
100 
150 
88.4 
1.45 
3.24 
66.97 
29,900 
11.01 
12.5 
13.9 
31.0 
9.30 
104 
124 
51.6 
1.70 
3.05 
61. OS 
27.290 
11.80 
23.0 
25.6 
46.0 
10.00 
104 
124 
51.1 
1.95 1 
3.30 
60.54 
27,030 
13.41 
26.2 
29.2 
49.8 
10.30 
102 
128 
53.4 
2.20 i 
3.43 
59.80 
26,720 
14.92 
27.9 
31.0 
47.2 
11.00 
101 
127 
53.2 
2.40 
3.52 
58. 28 
26,050 
15.86 
29.8 
33.1 
4S.5 
11.30 
103 
127 
53.0 
2.75 
3.77 
56.66 
25,310 
17.67 
33.3 
37.0 
50.7 
12.00 
104 
126 
52.8 
3.00 
3.95 
55.24 
24,690 
IS. 79 
35.6 
39.5 
52.0 
12.30 
104 
124 
48.3 
3.35 
4.24 
53.67 
23.S10 
20.39 
42.2 
46.9 
59.4 
1.00 
S4 
120 
41.7 
3.62 
4.32 
43.65 
19,500 
17.92 
43.0 
47. S 
57.0 
1.30 
102 
126 
50.8 
3.90 ' 
4.70 
41.54 
IS. 570 
IS. 37 
36.2 
40.2 
48.5 
2.00 
10S 
12S 
52.1 
4.00 
4.97 
47.14 
21,060 
21.38 
41.1 
45.7 
56.6 
Average . . 
101.5 
127.6 
54.2 
2.76 
3.86 
55.00 
24,6S0 
16.50 
i Efficiencies: 
1. Efficiency 
2. Efficiency 
3. Efficieney 
of engine, pump, and piping. 
of pump and piping, assuming mechanical efficiency of engine at 90 per cent. 
of pump, assuming mechanical efficiency of engine at 90 per cent. 
As the lift of the pumps was so variable, no average efficiency was 
determined. A summarv of the boiler test follows: 
Boiler test. 
Duration of test, hours 
Total water used, pounds 
Total fuel oil used . pounds 
Ratio of water to fuel oil 
Average steam pressure, pounds per square inch 
Average feed-water temperature. c F 
Factor of evaporation 
Ratio of water evaporated at 212° to fuel oil 
Efficiency of boiler (assuming IS. 500 B. T. U. per pound of fuel oil), percent. 
5. OS 
26, 760 
2,095 
12.7 
101 
144 
1.11 
14.1 
74 
