12 
BULLETIN 1067, IT. S. DEPARTMENT OF AGRICULTURE. 
was made to measure the moisture injthe steam, the amount of which 
at times was quite large. Observations were taken 'jatvhalf -hour 
intervals. The quantity of water pumped was measured by means 
of Pitot tubes, one being placed in the discharge pipe of each pump. 
Velocity was measured at 10 points in the pipe, so chosen that 
the arithmetical mean of the separate velocities gave the mean 
velocity of water in the pipe. 
Gages set in still water in the suction and discharge canals were 
read, and the difference of the readings used as head of actual lift in 
computing the useful water horsepower. The heads on the pumps 
were found by providing openings in the suction and discharge pipes 
near the pumps and reading the negative heads by means of a mer- 
cury column. The suction head was taken in each case as the mean 
of the two readings on the suction pipes. The head on pump was 
computed from the formula 
Va 2 -V 2 
H=7i d -7i s ±Ti"+ V 
2g 
h 
head in discharge pipe in feet of water shown by mercury 
column; it may be positive or negative. 
Ji s = head on suction pipe in feet of water shown by mercury column; 
it is usually negative. 
h" = difference of level of openings induction and discharge pipes; 
this term is + if opening in discharge pipe is above that in 
suction and — when the opposite is true. 
F d = mean velocity in discharge pipe. 
F s = mean velocity in suction pipe. 
Table 4 shows the results obtained by the test and Table 5 gives 
a summary of the results of the engine and pump test and the boiler 
test. 
Table 4. — First test of Phillips Land Co. pumping plant, Oct. 19, 1912. 
36-INCH UNIT. 
Time. 
Boiler 
pres- 
sure. 
Horse- 
power. 
Speed. 
Actual 
lift. 
Head 
on 
pump. 
Discharge. 
Useful 
water 
horse- 
power. 
Pump 
horse- 
power. 
Effici 
Based 
on 
useful 
water 
H. P. 
ency. 
Based 
on 
pumo 
H. IV 
10:00 
10:30 
11:00 
1130 
12 00 
1230 
1:00 
1:30 
2 00 
2:30 
3.00 
3 30 
4 00 
Lbs. per 
sq.in. 
118 
118 
117 
120 
126 
120 
120 
117 
120 
125 
115 
118 
117 
94.0 
92.2 
86.7 
90.9 
90.6 
93.1 
91.6 
88.4 
88.6 
87.8 
86.9 
86.3 
90 3 
R.p.m. 
176 
176 
172 
174 
174 
177 
177 
177 
176 
177 
177 
176 
177 
Feet. 
3.85 
4.01 
4.13 
4.21 
4.29 
4.40 
4.49 
4.59 
4.67 
4.77 
4.86 
4.94 
5.04 
Feet. 
6.93 
6.61 
"*6." 63" 
6.63 
"""7." 08' 
6.76 
6.92 
6.97 
7.26 
7.10 
7.22 
Sec.-ft. 
62.2 
63.0 
61.2 
61.0 
60.6 
61.2 
61.7 
60.4 
59.5 
54.8 
53.9 
54.2 
59.5 
G.p.m. 
27,910 
28, 280 
27, 480 
27, 390 
27,2 
27,480 
27, 700 
27, 100 
26, 700 
24,600 
24, 190 
24, 320 
22, 670 
27.20 
28.70 
28.70 
29.15 
29.60 
30.60 
31.50 
31.45 
31.55 
2). 60 
29.65 
30. 35 
2890 
48.90 
47.25 
"45." 80" 
45.70 
■"49*66" 
46.30 
46.70 
43.30 
44.30 
43.60 
41.40 
P.ct. 
28.9 
31.1 
33.1 
32.1 
32.7 
32.9 
34.4 
35.6 
35.6 
33.7 
34.1 
35.1 
32.0 
P. ct. 
52.1 
51.3 
50.5 
50.4 
"'*54.'i 
52.3 
52.7 
49.3 
51.0 
50.5 
45.8 
Mean 
118.5 
89.8 
1759 
4.48 6.92 
1 • 
58.7 26,345 29.75 45.75 
33.2 
50.9 
Fuel oil used, both units, 2,256 pounds; feed water used, both units, 27,850 pounds 
