TESTS OF DRAINAGE PUMPING PLANTS. 



35 



Table 26. — Test of pumping plant in subdistrict No. 

 No. 12, Raceland, La., Nov. 2. 



1 of Lafourche drainage district 

 ', 1913. 



Time. 



Speed. 



Indi- 

 cated 

 horse- 

 power. 



Actual 

 Uft. 







Water 

 horse- 

 power. 



Efficiency. 1 



Fuel 

 used per 





1 



2 



one-half 

 hour. 



\ R. p. TO. 

 8.45 205 



31.4 

 34.0 

 32.2 

 33.8 

 34.1 

 34.5 

 34.5 

 35.4 

 35.9 



Feet. 

 2.18 

 2.25 

 2.47 

 2.73 

 3.05 

 3.29 

 3.54 

 3.82 

 4.12 



Sec.-ft. 

 36.44 

 35.78 

 34.49 

 34.36 

 33.62 

 33.15 

 33.64 

 32.82 

 31.46 



G. p. TO. 

 16, 370 

 16,060 

 15,445 

 15, 430 

 15, 100 

 14,885 

 15, 110 

 14, 740 

 14, 120 



8.97 

 9.14 

 9.60 

 10.45 

 11.70 

 12.41 

 13.52 

 14.22 

 14.65 



Per cent. 

 28.6 

 26.9 

 29.8 

 31.6 

 34.3 

 35.0 

 39.2 

 40.3 

 40.8 



Per cent. 

 35.7 

 33.6 

 37.2 

 39.5 

 42.8 

 43.7 

 49.0 

 50.5 

 51.0 



Pounds. 



9.15 



9.45 



10.15 



10.45 



11.15 



11.45 



12.15 



12.45 



Mean.. 



206 

 201 

 206 

 204 

 205 

 210 

 212 

 215 



11.00 

 10.44 

 20.31 

 10.56 

 13.75 

 13.62 

 13.00 

 12.87 



207 



34.0 



3.05 



33.97 



15, 245 



11.52 



34.1 



42.6 



13. 19 



1 Efficiency: (1) Efficiency of pump, piping, and engine. (2) Efficiency of pump and piping, assuming 

 mechanical efficiency of engine to be 80 per cent. 



TEST OF PUMPING PLANT IN SUBDISTRICT NO. 2 OF LAFOURCHE DRAINAGE 

 DISTRICT NO. 12, RACELAND, LA. 



This pumping plant contains two units similar to those at Race- 

 land subdistrict No. 1 and similar methods of testing were used. 

 The pumps and accessories are practically the same, but the engines, 

 while of the same type and make as those in the previously described 

 plant, have a cylinder diameter of 15 inches with 24-inch stroke. 

 The pumps are 24-inch drainage pumps of the centrifugal type. 

 The behavior of the engine in this test was doubtless affected by the 

 presence of some Mexican crude oil which had been put in the tank 

 more than a year before. 



The indicator cards, when taken for several cycles, showed two 

 different areas: One area was the regular card, while the other 

 showed a rise in the compression line earlier than in the large card 

 and no great increase of pressure at the end of compression, but a 

 gradual rise of pressure as expansion proceeded until at exhaust 

 opening the pressure was about the same as for the large card. 

 There was no accurate way to determine how often either of these 

 cards occurred. The evidence from a great many cards showed that 

 the numbers of large and small cards were about equal, but this 

 was too uncertain to make the indicated horsepower reliable enough 

 to compute pump efficiency. Owing to the behavior of the engine 

 the speed of pump was quite variable. Table 27 gives the results 

 obtained. 



