18 BULLETIN lOS 1 ?, U. S. DEPARTMENT OF AGRICULTURE. 



Table 10. — Second test, 'pumping plant in subdistrict No. 1, Lafourche drainage district 

 No. 6, Oct. 23,1913— Unit No. 1. 





Boiler 

 pressure. 



Speed. 



Indicated 

 horse- 



Actual 

 lift. 



Discharge. 



Water 

 horse- 



Efficiency. 



Time. 



Pump, 



Pump 

 and 

















power. 



engine, 



















piping. 



piping. 1 





Lbs. per 





















so. in. 



R.p.m. 





Feet. 



Sec. ft. 



G.p.m. 





Per cent. 



Per cent. 



12.15 



90 



188 



60.15 



3.93 



45.09 



20,200 



20.15 



33.5 



37.2 



12.30 



102 



152 



33.44 



4.01 



34.30 



15,400 



15.56 



46.5 



51.7 



1.00 



95 



144 



27.40 



4.04 



27.77 



12, 460 



12.68 



46.3 



51.4 



1.30 



100 



146 



29.73 



3.93 



32.92 



14,780 



14.71 



49.5 



55.0 



2.00 



90 



152 



31.76 



3.84 



31.08 



13,950 



13.56 



42.7 



47.4 



2.30 



90 



151 



30.30 



3.84 



30.74 



13,800 



13.42 



43.8 



48.7 



3.00 



96 



154 



33.05 



3.88 



30.72 



13,790 



13.55 



41.0 



45.5 



3.30 



92 



150 



30.59 



3.88 



31.18 



13,990 



13.75 



45.0 



50.0 



4.00 



88 



150 



29.97 



3.85 



30.37 



13,630 



13.29 



44.3 



49.2 



4.30 



90 



148 



30.00 



3.85 



30.06 



13,470 



13.35 



44.8 



49.8 



Average . 



94 



150 



30.69 



3.90 



31.01 



13,920 



13.76 



44.9 



50.0 



1 Engine assumed to be 90 per cent efficient. 



The total feed water used in the boiler from 12.15 until 4.30 was 7,590 pounds, or 58.1 pounds per indi- 

 cated horsepower-hour. 



THIRD TEST. 



During the fall of 1919 changes were made in the equipment of the 

 pumping plant. A 4-cycle, 50-horsepower Ingeco distillate engine 

 was installed to drive one of the pumps, replacing one of the slide- 

 valve engines. Bevel gears of cast steel, having a ratio of 213 to 

 164, were used between the pump and engine. The smaller gear was 

 attached to the engine shaft. Both gears were hand-finished and 

 operated with very little noise. 



In the test of unit No. 1 of this plant after the above changes the 

 oil used by the engine was carefully weighed, while the output of the 

 pump was measured by means of a Pitot tube in the discharge pipe. 

 The lift was determined from gage readings on the suction and dis- 

 charge basins. Kerosene oil was used for fuel. Table 11 gives the 

 results of the test. 



Table 11. — Third test of subdistrict No. 1, Lafourche drainage district No. 6, Nov. 15, 



1919— Unit No. 1. 



Time. 



Speed. 



Engine. 



Pump. 



Actual 

 lift. 



Discharge. 



Water 

 horse- 



Pounds of 

 oil used 



P° wer - myites. 



Pounds of 

 oil used 

 per horse- 

 power 

 hour. 



11.15 



11.30 



11.45 



12.00 



12.15 



12.30 



12.45 



1.00 



1.15 



1.30 



1.45 



2.00 



2.15 



R.p.m. 

 212 

 202 

 206 

 209 

 209 

 208 

 208 

 209 

 208 

 1 215i 

 232" 

 227i 

 217" 



R.p.m. 

 163 

 156 

 159 

 161 

 161 

 160 

 160 

 161 

 160 

 166 

 179 

 175 

 167 



Feet. 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 

 4.27 



Sec.-ft. 

 32.52 

 29.95 

 29.95 

 31.98 

 31.78 

 31.70 

 31.82 

 32.32 

 32.14 

 31.86 

 37.37 

 36.48 

 34.62 



G.p. 

 14, 

 13, 

 13, 

 14, 

 14, 

 14, 

 14, 

 14, 

 14, 

 14, 

 16, 

 16, 

 15, 



600 

 450 

 450 

 350 

 250 

 230 

 290 

 520 

 430 

 300 

 770 

 370 

 550 



15.73 

 14.51 

 14.51 

 15.50 

 15.38 

 15.36 

 15.41 

 15.63 

 15.57 

 15.43 

 18.09 

 17.68 

 16.78 



10.69 

 10.00 

 10.50 

 10.38 

 10.38 

 10.12 

 10.25 

 10.44 

 10.06 

 10.06 

 12.09 

 12.03 



2.70 



1 Variation in speed of engine during this interval. 



