MICROFICHE REFERENCE LIBFUUW - Cd3wd.com
MICROFICHE REFERENCE LIBFUUW - Cd3wd.com MICROFICHE REFERENCE LIBFUUW - Cd3wd.com
here, the circular mot is usually limited to S-15 foot lifts, with capac-ities of around 800 cfh. This data is reported by Molenaar using 16 gallonbuckets. However, by utilizing additional pulleys and longer ropes, liftsof 30 feet with dischargesof 250 cfh have been accomplished using 12 gallonbuckets.Adjusting cost estimates reported by Molenaar in 1956, the initialcost of a mot (including rope, pulleys, trough, supports, bucket, andinstallation) would be about $50.00, with repair costs of a few dollars ayear. Of course, the cost of animals and the land needed to grow feed forthe animal (multiplied by the percentage of time for water lifting) mustalso be included in initial costs. In addition, the cost of feed or loss ofproduction of the land must be considered in the operating cost.3.2.1.4 Bucket, Rope, and Windlass (Crank)As with the use of multiple pulleys, the windlass or crank providesmechanical advantage to allow increased capacity (load) of a bucket and rope.Many variations of the windlass are possible, including combinations withpulleys, gears, treadmills, etc. The most commonly used modification is theutilization of two buckets attached to opposite ends of the same rope whichis wrapped around the windlass roller. In this way, the buckets counterbalanceeach other and the BHP must only balance the water weight and friction.The use of these additional devices, such as gears, rollers, and pulleys,can significantly increase the efficiency of the windlass by decreasing theneeded BHP . The use of low friction losses. No data appears availableon the performance and cost of this simple lifter.Costs throughout this paper have been adjusted to 1975 United Statesof America Dollars.
363.2.1-S Counterpoise LiftThe counterpoise lift is another variation of the rope/pole andbucket and was one of the earliest water lifters (see Section 1.2). Ithas been used throughout the world, with many countries reporting severalhundred still in use (Franji and Mahajan, 1969, and Dias, 1953). Manynames have been attributedused are:tothis device. A list of the most frequentlyshaduf (Egypt)shadoofshadoufchadoufkhetarakerkazkheerazgueninabasculedhenkalidhenklidhinglipicottah (India)lat (India)picotas (Portugal)sweepswapeIn its most common form today this water lifter consists of a bucketattached to one end of a vertical pole which hangs (freely) from a lever.As can be seen in Figure 3.3, this level pivots about a horizontal crossbarand is counterbalanced by a weight. This weight is usually sufficientto balance half the weight of the full bucket so that the attendant needonly lift half the bucket and water weight. Then, to return the bucketto the water supply, he can use his weight (at least to some degree) tooffset the counterweight in order to pull the lever down. However insome cases, the counterweight may be allowed to balance the entire bucketand water weight if the attendant is able to utilize enough of his weight
- Page 1: MICROFICHEREFERENCELIBFUUWA project
- Page 4 and 5: TABLE OF CONTENTS:.LIST OF FIGURES
- Page 6 and 7: LIST OF FIGURES (CONT)Figure3.163.1
- Page 8 and 9: LIST OF TABLESTable2.12.2a2.2b3.13.
- Page 10 and 11: 2find both new water lifting device
- Page 12 and 13: 4During the 3rd centuryB.C., Archim
- Page 14 and 15: GIn 1698, Thomas Savery obtained a
- Page 16 and 17: 9the United States was starting set
- Page 18 and 19: 11engines, motors, transmissions, e
- Page 20 and 21: Chapter 2Water LiftingPrinciples2.1
- Page 22 and 23: 15Table 2.2a Classification of wate
- Page 24 and 25: 2.2.1 Discharge or Capacity (Q)Disc
- Page 26 and 27: (h) Drawdown (D) is the vertical di
- Page 28 and 29: 21Tota I DynamicHeadI Total Static
- Page 30 and 31: 23Vapor Pressure (P,)Suction Fricti
- Page 32 and 33: Multiplying all these efficiencies
- Page 34 and 35: 27NPSHR-Q, is also usually included
- Page 36 and 37: 3.2.1.1 Bucket/BagUtilizing nothing
- Page 38 and 39: handmade construction can be easily
- Page 40: animal is returning to the top, the
- Page 45 and 46: 38to return the lever. Combinations
- Page 47 and 48: 40Table 3.1Shadouf performanceLift
- Page 49 and 50: (b)Figure 3.5 Scoop (a) used as sho
- Page 51 and 52: ‘PIVOT-r- ----hFigure 3.6 Wzcer b
- Page 53 and 54: 46water. The capacity of this devic
- Page 55 and 56: - =7?=PIVOTCOUNTER WEIGHT\FLAP- VAL
- Page 57 and 58: 50(a)ROLLER 7- HAND RAIL/SIDE - BY-
- Page 59 and 60: 52flow in through a check-valve (e.
- Page 61 and 62: 54exhaust valves for the steam (or
- Page 63 and 64: 56Another significant difference be
- Page 65 and 66: 58shaft), two other forms of these
- Page 67 and 68: 60Among the simplest designs for a
- Page 69 and 70: 62/HANDLEBARDISCHARGEHOSEfFOOTRE$TD
- Page 71 and 72: 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
363.2.1-S Counterpoise LiftThe counterpoise lift is another variation of the rope/pole andbucket and was one of the earliest water lifters (see Section 1.2). Ithas been used throughout the world, with many countries reporting severalhundred still in use (Franji and Mahajan, 1969, and Dias, 1953). Manynames have been attributedused are:tothis device. A list of the most frequentlyshaduf (Egypt)shadoofshadoufchadoufkhetarakerkazkheerazgueninabasculedhenkalidhenklidhinglipicottah (India)lat (India)picotas (Portugal)sweepswapeIn its most <strong>com</strong>mon form today this water lifter consists of a bucketattached to one end of a vertical pole which hangs (freely) from a lever.As can be seen in Figure 3.3, this level pivots about a horizontal crossbarand is counterbalanced by a weight. This weight is usually sufficientto balance half the weight of the full bucket so that the attendant needonly lift half the bucket and water weight. Then, to return the bucketto the water supply, he can use his weight (at least to some degree) tooffset the counterweight in order to pull the lever down. However insome cases, the counterweight may be allowed to balance the entire bucketand water weight if the attendant is able to utilize enough of his weight
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