MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

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, _1174.3 Jet PumpsA jet pump is a device which uses the kinetic energy of one fluid(i.e., the driving fluid), rather than an impeller, to pump another fluid.Depending on their application, jet pumps are known by several names;injector, jet heat exchanger, ejector, and eductor. The first two utilizea gas (usually steam) to drive another gas or a liquid, while the lattertwo devices utilize a liquid (usually water) to driveanother liquid or agas (Engineering, 1968, and Kneass, 1903). The term, eductor, also appliesto air-lift pumping (Chapter 3) which is a positive displacement methodand should not be confused with the jet principle. Injectors and exchangersare primarily used in conjunction with boilers. Therefore, in irrigationand drainage applications, the use of a “jet pump” usually implies anejector .An ejector utilizes a driving pump * to force the driving water at ahigh pressure into a venturi tube or suction box. There it entrains additionalwater to deliver a discharge of higher volume and lower pressure.This principle can be used in either of the two methods shown in Figure 4.7.For ease of operation and installation in wells, the sequence of Figure4.7b is usually utilized in irrigation and drainage systems. However, itis the design in Figure 4.7a that is often used to add fertilizer toirrigation water. The arrangement of Figure 4.7b can increase the capacityof a centrifugal pump, however, at the expense of total head and efficiency.Although ejector efficiencies rarely reach 40 percent, this is also aneffective way to increase the suction lift capability of a centrifugal* This pump is usually a centrifugal device, however, recent developmentsare incorporating positive displacement pumps--see Walkden, 1967, p. 318-319.
118DRIVINGSUCTIONDIFFUSERa- - =tQ,EFF --. _ QsfQn Hd- Hs% Hn-HdAL--A--_EFF = m% .“d- HS% “II- “dFigure 4.7 Two ejector arrangements:la) Q, = Qs+\s @I Q, = Q,,with recycledQn
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MICROFICHEREFERENCELIBFUUWA project
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TABLE OF CONTENTS:.LIST OF FIGURES
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LIST OF FIGURES (CONT)Figure3.163.1
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LIST OF TABLESTable2.12.2a2.2b3.13.
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2find both new water lifting device
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4During the 3rd centuryB.C., Archim
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GIn 1698, Thomas Savery obtained a
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9the United States was starting set
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11engines, motors, transmissions, e
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Chapter 2Water LiftingPrinciples2.1
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15Table 2.2a Classification of wate
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2.2.1 Discharge or Capacity (Q)Disc
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(h) Drawdown (D) is the vertical di
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21Tota I DynamicHeadI Total Static
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23Vapor Pressure (P,)Suction Fricti
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Multiplying all these efficiencies
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27NPSHR-Q, is also usually included
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3.2.1.1 Bucket/BagUtilizing nothing
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handmade construction can be easily
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animal is returning to the top, the
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363.2.1-S Counterpoise LiftThe coun
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38to return the lever. Combinations
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40Table 3.1Shadouf performanceLift
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(b)Figure 3.5 Scoop (a) used as sho
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‘PIVOT-r- ----hFigure 3.6 Wzcer b
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46water. The capacity of this devic
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- =7?=PIVOTCOUNTER WEIGHT\FLAP- VAL
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50(a)ROLLER 7- HAND RAIL/SIDE - BY-
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52flow in through a check-valve (e.
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54exhaust valves for the steam (or
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56Another significant difference be
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58shaft), two other forms of these
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60Among the simplest designs for a
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62/HANDLEBARDISCHARGEHOSEfFOOTRE$TD
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HANDLE/CONNECTINGARMDISCHARGEFLAP V
Page 73 and 74: 663.3.1 WheelAfter many of the earl
Page 75 and 76: 68Table 3.2 Manually-operated paddl
Page 77 and 78: 70engine (2-3 hp) as the prime move
Page 79 and 80: 72Table 3.3 records some of the per
Page 81 and 82: 74Several names which are also appl
Page 83 and 84: 76Table 3.5Zawafa performanceLiftDi
Page 85 and 86: 78noria and the discharge and head
Page 87 and 88: 80enclosed circumference can also b
Page 89 and 90: 82Most early tympanums were of the
Page 91 and 92: 84Table 3.6Tympanum performanceDiam
Page 93 and 94: 86sufficiently compact and lightwei
Page 95 and 96: 88of 3000 gpm or 5000 psig. Dependi
Page 97 and 98: SE;vlI - ROTARYBUCKET VANEU’C)Fig
Page 99 and 100: 92(a)AIRCHAMBERAIR FEEDERVALVEWASTE
Page 101 and 102: 94Table 3.8Ram performanceA. Typica
Page 103 and 104: COMPRESSEDAIRDEAofpctI5LT1EDUCTC II
Page 105 and 106: 98FLASHTANK .iJI 10 -NON-RETURNVALV
Page 107 and 108: Because the components are not yet
Page 109 and 110: 102air-lift pumps. The oscillation
Page 111 and 112: 104and from the impeller and confin
Page 113 and 114: 106making this type pump useful for
Page 115 and 116: 90s; 80iTi!g 700E 60W50SPECIFIC SPE
Page 117 and 118: 110to lubricate all or some of thei
Page 119 and 120: 112such variables as impeller size,
Page 121 and 122: 114GEAR HEADOR IVE SHAFTTO PRIME MO
Page 123: 116W(clFigure 4.6 (a) Thai-style ou
Page 127 and 128: DISCHARGELINE OISCHARGE RETURNLINEL
Page 129 and 130: -122which at $.20/kg, cost $6.00. H
Page 131 and 132: Table 5.1Manual power appl icat i a
Page 133 and 134: 126water lifting device. Animals ar
Page 135 and 136: 1285.4.1 WindWindmills are currentl
Page 137 and 138: 130even saw use on the windy plains
Page 139 and 140: 172HAL F CYLINDERSt------TO WATER L
Page 141 and 142: 135a vertical shaft, the wind will
Page 143 and 144: --Table 5.3 Typical winchnil 1 clpp
Page 145 and 146: Table 5.4 Typical watermill applica
Page 147 and 148: 141MEDIUM BREASTFigure 5.6 (a) Medi
Page 149 and 150: SLUICEGATEc, ~/I#/,.----- ------I L
Page 151 and 152: 145-H-f -- WH---@II
Page 153 and 154: 147with a 330,250 gpd capacity. Bat
Page 155 and 156: 149Where electric power is not econ
Page 157 and 158: 151electricity), the amount of use
Page 159 and 160: 153of building and installing the d
Page 161 and 162: 155II 300‘0083ooLoo93oo‘ootr000
Page 163 and 164: 157Example G .l (after Molenaar, 19
Page 165 and 166: LOW LIFT VERTICAL PUA /lPI------PER
Page 167 and 168: Chapter 7Improvements and Research
Page 169 and 170: 163example for further projects (Fa
Page 171 and 172: 165Reynolds (1970) writes, " . ..ma
Page 173 and 174: 16?BIBLIOGKAPlIYAddison, Ii., Ccntr
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169Committee on Water Supply Engine
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Gatz, C. A., Johnston Vertical Pump
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173Mother Earth News,1574.Ilandbook
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175Reynolds, I. II. , “High Duty
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177Svcndsen, M., "Irrigation Techno
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179APPENDIX
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Tabic;: A.2 Area conversions and ab
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Table A.4 Pressure conversions and
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Table A.6 Discharge conversions and
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Table'A.8 Specific speed (N,) conve
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ABHPDD- area- brake horsepower- dia
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