16 BULLETIN 1067. U. S. DEPARTMENT OF AGRICULTURE. 
usual oil and boiler feed pumps. The machinery is housed in a 
corrugated-iron building and is mounted on a concrete foundation 
supported by piling. 
The pumps take the water from the main canal of the district and 
discharge it into Bayou Des Allemands through about 300 feet of 
outlet canal. The bulk of the water from the average rain is lifted 
about 3 feet, so the plant was tested at this lift. When the canals 
are empty the lift is about 8 feet, but very little water is lifted more 
than 5 feet. The water on the discharge side varies about 1 foot in 
height, according to the stage of water in the bayou. 
FIRST TEST. 
For the first test the plant was operated under normal conditions, 
using only one of the boilers. Observations were taken at intervals 
of a half hour. The discharge from the pumps was measured by 
means of a Pitot tube in each discharge pipe. Gages set in the still 
water in the suction and discharge canals were read and the actual 
lift obtained. This lift was used in computing the water horsepower. 
The water used in the boiler during the test was measured in a 
large storage tank. Water was then drawn from this tank and 
pumped through the heater into the boiler. The oil used as fuel 
during the test was measured with approximate accuracy in the 
large storage tank. However, as the tank was about 19 feet in 
diamater and the oil was lowered only 0.091 foot during the test, 
it is evident that the oil measurement is only a close estimate, and 
the error of observation might change the result materially. 
The usual method of finding the total head on pump, or dynamic 
head, was followed, but gave results so erratic that they were con- 
sidered of no value. The results obtained are set forth in some 
detail in Table 9. A summary of results is given in Table 8. 
Table 8. — Engine and pump test. 
Unit No. 1. Unit No. 2. 
Duration of test, hours 4 4 
Revolutions per' minute 172 162 
Indicated horsepower 46. 8 38. 7 
Steam used per indicated horsepower, per hour, average pounds 40. 7 40. 7 
Discharge, cubic feet per second .' 38.7 37 
Discharge', gaUons per minute 17, 340 16. 580 
Static-head, feet 2. 97 2. 97 
Useful water horsepower 13. 01 11. 34 
Efficiency of pump, eneine, and piping 28 29. 3 
Efficiency of pump and piping (assumed engine efficiency, 90 per cent 31. 1 32. 6 
BOILER TEST. 
Duration of test, hours 4. 2 
Average steam pressure, pounds per square inch 89. 01 
Total water used, pounds 14.611 
Total fuel oil used, pounds 1, 507 
Ratio of water to fuel oil 9. 69 
Average feed-water temperature, °F 15.5 
Factor of evaporation 1. 097 
Ratio water evaporated from and at 212° to fuel oil 10. 63 
Efficiency of boilers (assuming 18,500 B. t. u. per pound of oil), per cent 55. 6 
