TESTS OF DRAINAGE PUMPIXG PLANTS. 15 



Table 6. — Second test of Phillips Land Co. pumping plant, Aug. 11, 1916 — Contd. 



24-INCH UNIT. 



/ 

 Time. 



Speed. 



Indi- 

 cated 

 horse- 

 power. 



Actual 

 lift. 



Discharge. 



Useful 

 water 

 horse- 

 power. 



Efficiency 



of 



engine, 



pump, 



and 

 piping. 



1.3.5 



P. p.m. 

 207 

 206 

 206 

 244 

 244 

 198 

 198 

 199 



33.93 

 32.78 

 32.02 

 50.73 

 50.11 

 26.83 

 26.85 

 26.87 



Feet. 

 6.25 

 6.30 

 6.34 

 6.44 

 6.45 

 6.45 

 6.45 

 6.45 



Sec.-ft. 

 26.20 

 26.38 

 25.94 

 35.27 

 35.93 

 21.40 

 21.57 

 20.72 



G. p. m. 

 11,760 

 11,830 

 11,640 

 15,830 

 16, 140 

 9,610 

 9,680 

 9,300 



18.55 

 18.81 

 18.62 

 25.72 

 26.23 

 15.62 

 15.72 

 15.13 



Per cent. 

 54.7 



1.43 



57.4 



1.45 



58.2 



2.00 



50.7 



2.05 



52.4 



2.15 



58.3 



2.20 



58.5 



2.25 



56.2 









203 



35.01 



6.39 



26.68 



11, 974 



19.30 



55 8 







Table 7.- 



—Comparison of the results of the two test 



■ of the Phillips Land Co. plant. 





Unit. 



Lift. 



Rate of pumping. 



Efficiency of engine 

 pump, and pipe. 





1912 



1916 



1912 



1916 



1912 



1916 



36-inch 



Feet. 

 4.48 

 4.48 



Feet. 

 6.17 

 6.39 



Sec.-ft. 

 58.7 

 27.5 



Sec.-ft. 

 61.9 

 26.7 



Per cent. 

 33.2 

 43.4 



Per cent. 

 52.4 



24-ineh 



55.8 







During the test different speeds were tried. Some of the varia- 

 tions in efficiency are due to change of speed, but the superior effi- 

 ciencies obtained in the second test bear witness to the great improve- 

 ment of the pumping units resulting from the changes noted, for the 

 test was made in the same manner and with the same instruments 

 as the first test. 



TESTS OF PUMPING PLANT IN SUBDISTRICT NO. 1, LAEPURCHE DRAINAGE DISTRICT 

 NO. 6, LAFOURCHE PARISH, LA. 



DESCRIPTION OF PLANT. 



This plant is used to drain a tract of land containing about 1,880 

 acres. At the time of the first test the plant consisted of duplicate 

 units, each having a 24-inch double-suction centrifugal pump driven 

 by a 12 by 12 inch simple slide-valve engine. The suction openings 

 on the pumps are 18 inches in diameter. The intake and suction 

 pipes have been tapered and enlarged so that the area of the intake 

 is \:i and the area of the discharge 2.7 times the area of the discharge 

 nozzle of the pump. The pumps were direct connected to the 

 engines by flexible couplings. The exhaust of the engines was con- 

 ducted through :i common pipe (o a water heater and then exhausted 

 into the air. Steam was generated by two horizontal marine-type 

 boilers 7 feel in diameter by 13 feel long. Neither boilers nor steam 

 line were covered during the test- The fuel used was Mexican crude 

 oil. Steam wa used to atomize the oil in the furnaces and to run the 



