TESTS OF DBAIBTAGE PUMPING PLANTS. 



23 



SECOND TEST. 



The results of the second test are given in Table 14. Although 

 they appear to be quite consistent, the quantity of water entering 

 the suction pipe on the engine side was about 50 per cent more than 

 the quantity entering the other suction pipe. This is probably to be 

 attributed to the fact that the end of the suction pipe which had the 

 low capacity was close to the bottom of the canal. The same con- 

 dition existed during the first test. The water used in the boiler test 

 was measured by a Worthington piston meter. The amount of steam 

 used per horsepower per hour for all purposes was 33.7 pounds. The 

 fuel oil burned during the test was measured in a calibrated barrel. 



Table 14. — Second test of pumping plant in Jefferson drainage district No. 3, Lafitte, 

 La., Dec. 13, 1913 — Unit No. 2, 48-inch pump. 





Boiler 

 pres- 

 sure. 



Speed. 



Actual 

 lift. 







Useful 

 water 

 horse- 

 power. 



Efficiency. 1 



Horse- 

 power 

 indica- 

 ted. 



Time. 



Discharge. 



Pump, 

 piping, 



and 

 engine. 



Pump 



and 



piping. 



12.00 



12.30 



1.00 



1.30 



2.00 



2.30 



3.00 



3.30 



4.00 



Lbs. per 

 sq. in. 

 100 

 100 

 100 

 100 

 100 

 106 

 100 

 100 

 100 



R. p. m. 

 115 

 118 

 111 

 113 

 115 

 117 

 110 

 108 

 109 



Feet. 

 2.80 

 2.90 

 2.90 

 3.00 

 3.10 

 3.30 

 3.45 

 3.60 

 3.80 



Sec.-ft. 

 125.8 

 130.5 

 128.0 

 130. 8 

 . 124. 6 

 127.2 

 125.7 

 121.4 

 118.6 



G. p. m. 



55, 750 

 58,600 

 57, 450 

 58, 720 

 55, 910 

 57, 100 

 56, 410 

 54, 480 

 53, 250 



39.9 

 42.8 

 42.1 

 44.5 

 43.8 

 47.5 

 49.2 

 49.6 

 51.1 



Per cent. 

 23.5 

 22.3 

 26.5 

 25.6 

 24.0 

 28.2 

 32.0 

 33.9 

 33.9 



Per cent. 

 25.5 

 24.1 

 28.7 

 27.9 

 25.9 

 30.4 

 34.0 

 36.6 

 36.6 



170.0 

 192.9 

 159.0 

 173.7 

 182.8 

 168.6 

 153.7 

 146.5 

 151.0 



Mean 



100.7 112 



3.20 



125.8 



56, 480 



45.6 



27.8 



30.0 



166.5 



1 Mechanical efficiency of engine shown by friction cards to be 92.5 per cent. 



THIRD TEST. 



Nearly three years after the second test a third test was run, this 

 time on No. 1 unit. The useful lift, or actual head, varied from 6.04 

 to 6.5 feet. The results arc given in Table 15. 



Table 15. — Third test of pumping plant in Jefferson drainage district No. S, Lafitte, 

 La., Aug. 14, 1916 — Unit No. 1, 48-inch pump. 





Speed. 



Indica- 

 te 1 

 horse- 

 power. 



Actual 

 lift. 



Discharge. 



Useful 

 water 

 horse- 

 power. 



Efficiency. 



Time. 



Engine 



and 

 pump. 



Pump. 1 



11. 15 



R. p. m. 

 llfi 

 116 

 li- 

 ne, 

 116 



IIS 



ii- 



117 



UK 



IIS 



112 



112 

 114 



L61.7 

 165.0 

 173.7 



1 7.",. .'. 



Feet. 

 6.04 



8ec. ft. 

 U0.89 



G. p. m. 

 48, 900 



75.9 



Per cent. 

 46. '.i 



Per c< ni . 

 t 50.7 



11.20 







(i. in 



117.29 



10, OIK) 



81.2 



4l>. 7 



51). 6 









168.9 



171. S 















11.40 



6. 34 



113.66 



62, 600 



81.8 



47.7 





1 1 . 4.0 





11. 60 



171.0 

 166.7 

 167.4 

 136 9 

 138.4 



152.4 



6. in 



[09.02 



49,666 



79. 2 



46. 3 





11.58 





12.00 















12.10 



6. 60 



94, 69 



42,900 



eg a 



60 



































•Engine ciii- li • i mbI 



