10 



BULLETIN 1067, TJ. S. DEPARTMENT OE AGRICULTURE. 



1. A 16 by 24 inch automatic noncondensing engine connected by rope drive to a 

 rotary chamber-wheel pump. Maximum capacity of 40,000 gallons per minute. 



2. A similar engine connected by rope drive and bevel gear 1 to a 42 by 16 inch 

 Menge pump. 



3. A double vertical engine direct-connected to a 36-inch centrifugal pump. 



Pumps 1 and 2 discharge into open flumes at an average head on 

 the pump of 10 feet, which was 5 feet greater than necessary. The 

 bottom of the discharge flume was placed at the elevation of the top 

 of the back levee, which normally was about 5 feet higher than the 

 water of the swamp behind the levee. 



In testing pump No. 1, the .quantity of water was measured by 

 means of a weir without end contractions placed in the discharge 

 flume. Table 2 shows the results obtained by the test. 



Table 2. — Test 1 of pump No. 1, Willswood plantation, June 15, 1909. 



Boiler 

 pres- 

 sure. 



Indi- 

 cated 

 horse- 

 power. 



Speed. 







Actual 

 lift. 



Head 



on 

 pump. 



Water horse- 

 power. 



Efficiency of 



Engine. 



Pump. 



Discharge. 



Based 

 on actu- 

 al lift. 



Based 

 on head 



on 

 pump. 



engine, trans- 

 mission, and 

 pump. 



Lbs . per 

 sq. in. 

 89 

 89 

 89 

 90 

 92 

 87 

 86 



153.5 

 163.0 

 155. 8 

 166.8 

 166. 8 

 152.2 

 145.6 



R.p. m. 

 108.5 

 115.0 

 112.5 

 116.5 

 117.5 

 109.0 

 106.0 



R. p. m. 

 89.0 

 94.5 

 92.0 

 95.5 

 96.0 

 89.5 

 87.0 



Sec.-ft. 

 78.2 

 83.0 

 80.8 

 83.9 

 84.3 

 78.7 

 76.4 



G.p. in. 

 35, 200 

 37, 300 

 36, 300 

 37,700 

 37,900 

 35,400 

 34,400 



Feet. 

 5.2 

 5.3 

 5.4 

 5.5 

 5.5 

 5.5 

 5.6 



Feet. 

 10.0 

 10.3 

 10.3 

 10.5 

 10.5 

 10.5 

 10.5 



46.0 

 49.6 

 49.3 

 52.1 

 52.3 

 48.8 

 48.4 



88.4 

 96.5 

 94.0 

 99.5 

 100.0 

 93.3 

 90.8 



Per 

 cent. 

 29.9 

 30.4 

 31.6 

 31.3 

 31.4 

 32.1 

 33.2 

 2 31. 41 



Per 



cent. 

 57.5 

 59.1 

 60.3 

 59.8 

 60.0 

 61.3 

 62.3 

 2 60. 04 

















1 Duration of test, 1 hour and 30 minutes. 

 - Average. 



When the pump was credited with the head through which the water 

 was elevated at the pump the average efficiency of engine, trans- 

 mission, and pump was found to be 60 per cent. Based on the actual 

 lift it was only 31 per cent. Assuming the mechanical efficiency 

 of the engine as 90 per cent and the efficiency of transmission as 

 95 per cent, the efficiency of the pump, if credited with the whole 

 lift, is a little more than 70 per cent. 



TEST OF MENGE PUMP, PARADIS, LA. 



Several efficiency tests of Menge pump installations, both for 

 drainage and for irrigation, show that where the pumps were favor- 

 ably located and the plants in good condition the efficiencies were 

 excellent. 



The results given in Table 3 were obtained from a test of a drainage 

 plant made at Paradis, La. The plant consisted of a 48 by 18 inch 

 Menge pump run by means of a rope drive from a steam engine; 



1 This has since been changed to a quarter-twist rope drive, thus eliminating the bevel gears. 



