28 
BULLETIN 1067, U. S. DEPARTMENT OF AGRICULTURE. 
TEST OF PUMPING PLANT NO. 2, OF AVOCA DRAINAGE DISTRICT, ST. MARY PARISH, LA. 
DESCRIPTION OF PLANT. 
The equipment of this plant consists of a cross-drum boiler with 
1,162 square feet of heating surface, and a Corliss compound conden- 
sing engine with cylinder diameters 10 inches and 20 inches and 30- 
inch stroke with drop cut-off, direct connected to a double-suction 
centrifugal drainage pump. The pump has a discharge pipe 48 
inches in diameter and suction pipes 36 inches in diameter, all pipes 
measured at the flange. Both the suction and discharge pipes are 
enlarged at their outer ends. 
The test was made with the plant in normal operation. The in- 
struments and methods were the same as those used in the test of 
pumping plant No. 3 of Avoca drainage district. The average tem- 
peratures observed in degrees F. were as follows: Feed water 198°, 
air 99°. oil 93°, water pumped 80°. The weight of fuel oil used in 2\ 
hours was 934 pounds. The rate of use was quite regular, and the 
best economy was shown near the end of the test. Friction cards 
were taken at the end of the test with no water in the pump. The 
results are given in Table 19. 
Table 19. 
Revolu- 
j tions per 
minute. 
Indicated 
horse- 
power. 
84 
101 
110 
8.32 
11.01 
13.64 
Table 20 gives the results obtained during the test. 
Table 20. — Test of pumping plant Xo. 2, Avoca drainage district. 
Time. 
Boiler 
pressure. 
Speed. 
Indi- 
cated 
horse- 
power. 
Actual 
lift. 
Discharge. 
Useful 
water 
horse- 
power. 
Effi- 
ciency: 
Pump, 
engine, 
and 
piping. 
2.00. 
Lbs. per 
sq. in. 
115 
R. p. m. 
101.6 
123.75 
Fed. 
2. 7(i 
Sec.-ft. 
141'. 30 
138. 35 
139. 25 
133. 73 
127. 63 
110.72 
99.81 
G. p. m. 
63, 400 
44.2 
Per cent. 
35. 70 
2.30 
130 
135 
127 
127 
113. S ; 125.35 2.81 
118.8 170.50 3.41 
111.3 149.63 4.45 
111.6 150.78 4.93 
112.0 lis. 95 :,. S4 
108.6 I llfi.fiQ 
62, 100 44. 
62,-500 ! 53. S 
60,000 i 67.4 
57,300 71.3 
49. 700 73. 2 
44. 800 
35.10 
3.00 
31. 54 
3.40 
45. 00 
4.05 
47. 30 
4.19 
61.56 
4.30 
142 
60. 21 
