RP-01638

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GROUND LEVEL A B Fig. 5. (A) Lift and (B) suction pumps: (1) wooden parts; (2) galvanized parts; (3) PVC parts; (4) mild-steel stand; (5) concrete; (6) piston; (7) foot valve; and (8) casing pipe. two rural areas in Malaysia. The objectives of the field-testing program were to evaluate the technical performance under field conditions and the economic feasibility of wide-scale adoption for rural use in Malaysia. Measurement techniques for use in the field A number of laboratory measurement techniques for the determination of the technical performance of the reciprocating piston pump cannot be used in the field either because sophisticated electronic equipment is needed or because of physical constraints at the handpump site. Several simple field measurement techniques and apparatus were developed for use in the field evaluation program. Depth of water table In this method, the difference in the electrical resistance of water and air is employed to detect the water level in the well. The arrangement consists essentially of a sufficient length of twin-core wire and a perspex conical probe head. The twin wires are threaded into the central hole of the probe head and the ends of the wires enter two lateral holes and emerge flush with the surface on either side of the probe head. The probe head is machined with a total conical angle of 200 and the surface polished to facilitate drip-dry action when the probe is lifted out of the water. A multitest meter capable of measuring in the range of up to 300 kohms is connected to the other end of the twin-core wire to measure the resistance across the two 44
10 4 1 A B Fig. 6. (A) Piston assembly and (B) recoverable foot valve: (1) lock nuis; (2) valve flap (natural rubber); (3) piston rings (polyethylene); (4) six equally spaced holes; (5) boit; (6) valve stop; (7) PVC plastic; (8) hole for connecting pin; (9) recovery pin; and (10) double-lip rubber seal. terminais. When the terminais are exposed to air, the multitest meter reads open circuit. When the terminais are immersed in water, the meter reads in the order of 200 kohms. Discrete changes from infinity to 200 kohms can be obtained on the multitest meter for changes in the level of water of less than 0.24 inch (6 mm). The depth of the water table from the ground may be determined from the length of the wire. Total usage of handpump For a comparative study of wear and physical deterioration of major handpump components, a measure of the total usage of the handpump in the field over the period under consideration is needed. Figure 7 shows an arrangement where a Veeder-Root totalizing counter (which does not register reversed rotation) was adapted to measure the cumulative travel of the piston rod during the useful stroke. The mounting is 45
Page 1 and 2: ARCHIV SHARP no. 1
Page 3 and 4: IDRC-204e Village Handpump Technolo
Page 5 and 6: Contents Preface ..................
Page 7 and 8: Preface Many factors are involved i
Page 9 and 10: Introduction The precise links betw
Page 11 and 12: The primary objectives of these stu
Page 13 and 14: Sri Lanka Pathirana Dharmadasa, lJp
Page 15 and 16: m O C O x 00 N .,y D+ O G+ CL C n Q
Page 17 and 18: 13 8 -6 7 9 10 A B C Fig. 4. (A) LI
Page 19 and 20: in the village can easily make a ne
Page 21 and 22: Table 2. Overview of performance da
Page 23 and 24: Thailand Pichai Nimityongskul and P
Page 25 and 26: L -' 0 inch 3 cm 8 A B Fig. 1. (A)
Page 27 and 28: The tensile strength of the PVC pip
Page 29 and 30: 0 4 A B OF inch 1 cm 4 10 01 1 inch
Page 31 and 32: water per 10-cm stroke, changes in
Page 33 and 34: Fig. 11. Below-ground components of
Page 35 and 36: Philippines Antonio Bravo This repo
Page 37 and 38: 2 Fig. 3. Modified version of above
Page 39 and 40: At a standard frequency of about 40
Page 41 and 42: Malaysia Goh Sing Yau The populatio
Page 43 and 44: AP. AP (FU + FD) (WW1 + WW2 + BP +
Page 45: Optimum Design It is difficult to s
Page 49 and 50: made from a 0.5-inch (1.27-cm) thic
Page 51 and 52: PK 006S2 312181 717181 60 1019181 0
Page 53 and 54: was found only in: (1) the top wood
Page 55 and 56: Overview of Technical Performance G
Page 57 and 58: Ln Country and model Pedestal Table
Page 59 and 60: Economic Analysis and Potential Mar
Page 61 and 62: program is being curtailed by the l
Page 63 and 64: cylinder: PVC is one-third the cost
Page 65 and 66: about 50% of the cost of the existi
Page 67 and 68: Table 7. Summary of important handp
Page 69 and 70: Conclusions In an era of rapid deve
Page 71 and 72: Malaya proposes to address this que
Page 73 and 74: Participants ZAINUDDIN ARSHAD, Mini

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