An Investigation of the Efficiencies of a Cranberry Marsh 16 Inch Auger Pump Under Different Heads And At Varying Speeds

Cover An Investigation of the Efficiencies of a Cranberry Marsh 16 Inch Auger Pump Under Different Heads And At Varying Speeds
An Investigation of the Efficiencies of a Cranberry Marsh 16 Inch Auger Pump Under Different Heads And At Varying Speeds
Stivers, Earl Raimon
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flolent Speed R. P. tt.
Dlsohargs Cu.Pt.per Second Discharge Sal. per minute 1.300 304 2.115 960 2.275 397 2.510 1130 3.750 523 5.980 1790 5.000 606 4.839 2170 5.740 653 5.000 2250 % Efficiency to be expect- ed 28 34 39 38 37 Digitized by Google Digitized by Google 27 From this table the cnrvee on Plate 7X1 were plotted. It waa at first thought that all these fariahles could he shown by a single ourve having a graduated scale representing discharges and efficiencies* !Fhis was tried, but on inv
...estigation it was foxmd that the scales varied so ununiformly that this was given up and the variation ahown by means of several ourve s* From these curves !Pable 11 was made for heads varying from one foot to six feet; showing the most effi« cient operating speed, discharge of water (gal* per minute), and the efficiencies to be expected.
7 A B L £ 11.
Head in Moat Sffi- oient Speed B. P. M.
Discharge , Sal. per Einnte ^ Sffioiency to be Expected.
1.0 276 920 26.5 1.5 325 975 29.0 2.0 370 1060 32.0 2.5 418 1225 35.0 3.0 460 1420 37.0 3.5 500 1670 38.5 4.0 540 1880 39.2 4.5 576 2040 39.0 5.0 606 2170 38.5 5.5 640 2230 37.5 6.0 666 2260 37.0 The curves of Plate Vll indicate that the effi-*- oienoies drop off at higher speeds* The conclusion Digitized by Google Digitized by Google 28 reached in this report, however, 13 that vhlle this may be true, speeds greater than 665 H*P#M* are not efficient 3peed3 under a range of heads less than 3lx feet.


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