40 



BULLETIN 1067, U. S. DEPARTMENT OF AGRICULTURE. 



Table 34. — Test of pump No. 3 of drainage pumping plant at Port Arthur, Tex., made 

 by W. P. Langworthy July 23-26, 1918. 



Time. 



Speed. 



Average 

 velocity 

 of flow. 



Discharge. 



Head. 



Fuel 



used. 



Water 



pumped 



per gallon 



of fuel 



used. 



11.28* 



R.p.m. 

 250 

 250 

 249 

 246 

 246 

 246 

 245 

 241 

 243 

 244 

 243 



Ft.persec. 

 7.91 

 7.84 

 7.79 

 7.80 

 7.51 

 7.29 

 7.36 

 7.27 

 7.28 

 7.26 

 7.21 



Sec -ft. G.p.m. 

 116.75 1 52,400 

 115.41 ! 51,800 

 114.75 51,500 

 112.07 50,300 

 110.51 i 49,600 

 107.39 ! 48,200 

 108.28 48,600 

 107. 17 48, 100 

 107.39 1 48,200 

 106.95 ' 48,000 

 106.28 i 47,700 



Feet. 

 3.00 

 3.38 

 3.86 

 3.96 

 4.06 

 4.19 

 4.36 

 4.63 

 4.76 

 4.90 

 5.00 



G.p.m. 

 0.160 

 .157 

 .166 

 .173 

 .174 

 .178 

 .194 

 .174 

 .183 

 .184 

 .163 



Gallons. 

 327, 000 



11.36 



330, 000 



11.51 



310, 000 



11.55 



291,000 



11.59 



285, 000 



12.03 



271,000 



12.07 



250, 000 



12.15 



276, 000 



12.19 



263, 000 



12.23 



261,000 



12.27 



293, 000 







TEST OF DRAINAGE PUMPING PLANT IN SUB-DISTRICT NO. 4, LAFOURCHE DRAINAGE 

 DISTRICT NO. 12, RACELAND, LA. 



This plant, which drains 4,466 acres of prairie land, was installed in 

 1915. The machinery consists of two units, duplicates in every way 

 except that the pumps are driven respectively by right-hand and 

 left-hand engines. The pumps are 48-inch centrifugal drainage 

 pumps designed for high speed and a flat power curve. The pump 

 impellers are a combination of the screw propeller and the ordinary 

 centrifugal pump impeller. Each pump has double-suction pipes 

 attached to 48-inch elbows, and both suction and discharge pipes are 

 enlarged at their outer ends. Wooden flap valves are used to cover 

 the discharge ends while the pumps are being primed. 



The pumps are driven by 2-stroke cycle Diesel engines 14-J by 24 

 inches, with variable speed governors. The plant is ordinarily oper- 

 ated between the limits of 190 to 200 revolutions, while for maximum 

 lift of about 9 feet the speed may be increased 220 revolutions per 

 minute. 



A test of one of the units was made to determine the oil consump- 

 tion for a given output of work. Observations were taken every 20 

 minutes on the speed, lift, suction (with manometers) , pounds of oil 

 consumed, and quantity of water pumped. The fuel used during the 

 test was crude oil, specific gravity 0.889, or 27.4° Baume at 60° F. 



The unit tested was situated on the left-hand side of the suction 

 canal looking upstream. The two suction pipes are labeled right and 

 left, as one stands facing the suction canal, and therefore the right- 

 hand suction pump is near the middle of the canal. During the test 

 an eddy was observed in the suction basin, so disposed that water was 

 brought to the right-hand pipe and away from the opening of the left- 

 hand suction pipe. The effect of the eddy was clearly shown in the 

 quantities of water measured in the two pipes, as the right-hand 

 pipe invariably carried more water. Without doubt this condition 



