TESTS OF DRAINAGE PUMPING PLANTS. 



41 



had some effect upon the efficiency of the pump, and consequently re- 

 duced the over-all efficiency. The eddy was caused by unequal 

 depths of water below the suction pipes and by the higher velocity 

 near the center line of the suction canal. 



RESULTS OF TEST. 



The test, which extended over a period of nearly six hours, was run 

 with a varying difference of levels in the canals, the lift increasing 

 from 3.55 feet at the beginning of the run to 4.96 feet at the close. 

 The speed of the pump was held uniform at 195 revolutions per 

 minute, but the total water pumped varied with the change in actual 

 lift, ranging from 60,050 gallons per minute at the lower lift (3.55 

 feet) to 54,700 gallons per minute at the higher lift (4.96 feet). The 

 results obtained are given in Table 35. 



The economy of the plant can best be realized by a comparison 

 with the steam pumping plant in subdistrict No. 1, Gueydan drainage 

 district, where the equipment consists of high-grade simple noncon- 

 densing Corliss engines and volute pumps. When pumping against a 

 head of approximately 5 feet the fuel consumption of the steam plant 

 was to that of the internal-combustion engine plant as 4.28 to 1 for 

 equal output of work. 



Table 35. — Test of pumping plant in subdistrict No. 4 of Lafourche drainage district No. 

 12, Raceland, La., Feb. 21, 1916. 



Time. 



Speed. 



Actual 

 lift. 



Discharge. 



Useful 

 water 

 horse- 

 power. 



9.40 



R.p.m. 

 195 

 196 

 195 

 195 

 195 

 195 

 1 95 

 195 

 195 

 195 

 195 

 195 

 195 

 195 

 195 

 195 

 195 

 195 



Feel. 



Sc:.-ft. 



G.p.m. 





10.00 



3. 55 

 3.03 

 3. 69 

 3. 75 

 3. 82 

 3. 90 



3. 98 



4. OS 

 1. 17 

 1.27 

 4.34 

 4.43 

 4. 52 

 1.63 

 1.71 

 4.84 

 1.96 



133. SO 

 132. 79 

 131.57 

 131.23 

 128.23 

 128.89 

 129.00 

 126.22 

 126.78 

 128.67 

 125.00 

 124.66 

 126.00 

 1 25. 55 

 123.88 

 123.32 

 121.88 



60.050 

 59.600 

 59, 050 

 58, 900 

 57. 550 

 57,850 

 58,300 

 56,650 

 56.9 10 

 57. 751) 

 56, 100 

 55.950 

 56.550 

 56,350 

 :,:, 600 

 55 350 

 .-,1.700 



53.80 



10.20 



54. 70 



[0.40 



55. 00 



11.00 



55.80 



11.20 



55, 50 



11.10 



56.95 



12.00 



58.60 



izai 



58.40 



:.'. H:.. 



59. 90 



1.00 



82. 25 



1.20 



01.50 



1. 10 



62.55 

 64, 55 







2. 20 



o;>. go 





66, 50 







67. 60 







68 50 









TBS1 <»i DBATNAGE i'i MPING PLANT OF LITTLE woods TEACT, NEW ORLEANS, LA. 



DE ■ BIPTIO OP PLANT. 



The \<-\v Orleans Lake Shore Land Co. has reclaimed an area of 

 6,943 acres of prairie Land, Located on Lake Pontchartrain, inside the 

 city Limits <>f \<u Orleans. The pumping plant was erected during 

 the latter pari of 1913. (See I'I. II.) [t consists of two centrifugal 

 pumps, each with ;i discharge opening equivalent to a circle of 51$ 

 inches diameter, connected l»\ means of herringbone gears to electric 



