12 



BULLETIN 1067, TJ. S. DEPARTMENT OF AGRICULTURE. 



was made to measure the moisture iruthe steam, the amount of which 

 at times was quite large. Observations were taken lat f'half -hour 

 intervals. The quantity of water pumped was measured by means 

 of Pitot tubes, one being placed in the discharge pipe of each pump. 

 Velocity was measured at 10 points in the pipe, so chosen that 

 the arithmetical mean of the separate velocities gave the mean 

 velocity of water in the pipe. 



Gages set in still water in the suction and discharge canals were 

 read, and the difference of the readings used as head of actual lift in 

 computing the useful water horsepower. The heads on the pumps 

 were found by providing openings in the suction and discharge pipes 

 near the pumps and reading the negative heads by means of a mer- 

 cury column. The suction head was taken in each case as the mean 

 of the two readings on the suction pipes. The head on pump was 

 computed from the formula 



Va 2 - V 2 



. ^9 



fr d = head in discharge pipe in feet of water shown by mercury 



column; it may be positive or negative. 

 h s = head on suction pipe in feet of water shown by mercury column; 



it is usually negative. 

 h" = difference of level of openings in suction and discharge pipes; 



this term is + if opening in discharge pipe is above that in 



suction and — when the opposite is true. 

 F d = mean velocity in discharge pipe. 

 V s = mean velocity in suction pipe. 



Table 4 shows the results obtained by the test and Table 5 gives 

 a summary of the results of the engine and pump test and the boiler 

 test. 



Table 4. — First test of Phillips Land Co. pumping plant,. Oct. 19, 1912. 

 36-INCH UNIT. 





Boiler 

 pres- 

 sure. 



Horse- 

 power. 



Speed. 



Actual 



lift. 



Head 



on 

 pump. 



Discharge. 



Useful 

 water 

 horse- 

 power. 



Pump 

 horse- 

 power. 



Effici 



ency. 



Time. 



Based 



on 

 useful 

 water 

 H. P. 



Based 



on 

 pump 

 H. P. 





Lbs. per 























sq.in. 





R.p.m. 



Feet. 



Feet. 



Sec.-ft. 



G.p.m. 







P.ct. 



P. ct. 



10:00 



118 



94.0 



176 



3.85 



6.93 



62.2 



27, 910 



27.20 



48.90 



28.9 



52.1 



10:30 



118 



92.2 



176 



4.01 



6.61 



63.0 



28, 280 



28.70 



47.25 



31.1 



51.3 



11:00 



117 



88.7 



172 



4.13 





61.2 



27, 480 



28.70 





33.1 





1130 



120 



90.9 



174 



4.21 



6.63 



61.0 



27, 390 



29.15 



45.80 



32.1 



50.5 



12 00 



126 



90.6 



174 



4.23 



6.63 



60.6 



27,2 



29.60 



45.70 



32.7 



50.4 



12 30 



120 



93.1 



177 



4.40 





61.2 



27, 480 



30.60 





32.9 





1:00 



120 



91.6 



177 



4.49 



7.08 



61.7 



27, 700 



31.50 



49.60 



34.4 



54.1 



1:30 



117 



88.4 



177 



4.59 



6.76 



60.4 



27,100 



31.45 



46.30 



35.6 



52.3 



2 00 



120 



88.6 



176 



4.67 



6.92 



59.5 



26, 700 



31. 55 



46.70 



35.6 



52.7 



2:30 



125 



87.8 



177 



4.77 



6.97 



54.8 



24,600 



21.60 



43.30 



33.7 



49.3 



3.00 



115 



86.9 



177 



4.85 



7.26 



53.9 



24, 190 



29.65 



44.30 



34.1 



51.0 



3 30 



118 



88.3 



176 



4.94 



7.10 



54.2 



24, 320 



30.35 



43.60 



35.1 



50.5 



4.00 



117 



90.3 



177 



5.04 



7.22 



50.5 



22, 670 



28.90 



41.40 



32.0 



45.8 



Mean 



118.5 



89.8 



175.9 



4.48 



6.92 



58.7 



28, 345 



29.75 



45.75 



33.2 



50.9 



S' 



Fuel oil used, both units, 2,256 pounds: feed water used, both units, 27,850 pounds. 



