Service Contract No 2007 / 147-446 - Swaziland

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0 L/4 L/2 3L/4 LL3L/4LL/2Test blockL/4Test emitter0HydrantFigure 18. Positions of complete sprinkler pressure measures in an irrigation blockPressure variation was calculated using equation 9 below and a summary of the results isoutlined in table 3.Pmax PP Pavemin………………………………………….. (9)Pressure measurement results for the different sections are indicated in the following table.Maphobeni Farmers Association Report - 2009 Page - 37 -
Table 3. Pressure and nozzle size measurements resultsMeasuring point Type of sprinkler/nozzle Measured nozzlediameterMeasurednozzle pressurePhase one RC 140 11/64" nozzle 4.4 440Phase one Rain bird BH30 11/64" nozzle 4.4 220Phase one Rain bird 14070 11/64" nozzle 5 220Phase one Rain bird 14070 11/64" nozzle 4.4 420Phase one Rain bird 14070 11/64" nozzle 4.4 450Phase two VYRSA 35 11/64" nozzle 4.4 340Phase two VYRSA 70 11/64" nozzle 4.5 330Phase two – block I RC 130 11/64" nozzle 4 250Phase two – block I VYRSA 70 11/64" nozzle 4.5 240Phase two – block I VYRSA 70 11/64" nozzle 4.5 230Phase two RC 130 11/64" nozzle 4 350Phase two – block I VYRSA 70 11/64" nozzle 4.5 210Phase two VYRSA 70 11/64" nozzle 5 290Phase two VYRSA 70 11/64" nozzle 5 360Phase two VYRSA 70 11/64" nozzle 5 330Phase two VYRSA 70 11/64" nozzle 5 360Average Pressure (kPa) 350.5 299.09Minimum Pressure (kPa) 220 210Maximum Pressure (kPa) 450 360Pressure Variation (kPa) 65.71 50.15According to the SABI norms, pressures in the infields may not vary more than 20% from theaverage pressure. Pressure measurement results as indicated by the above table reflect anunacceptable pressure variation of 65.71% for phase one and 50.15% for phase two. Theaverage system operating pressure is 350.1kPa and 299.09kPa for the two phasesrespectively. Phase one average sprinkler operating pressure is above the recommendedsprinkler operating pressure of 350kPa. Phase two average sprinkler operating pressure, onthe other hand is lower that the recommended 350kPa.The least amount of pressure was recommended on blocks I. this block is on top of a smallhill at the highest elevation and all hydromatics in the lateral were connected to sprinklers.Each lateral had up to 23 operating sprinkler connected to it.The following is an outline some of the factors affecting the above pressure reading;Maphobeni Farmers Association Report - 2009 Page - 38 -
Page 1 and 2: Restructuring and DiversificationMa
Page 3 and 4: DISCLAIMERThe contents of this repo
Page 5 and 6: 5.2 Delivery tests ................
Page 8 and 9: LIST OF APPENDICESAppendix 1: SEB u
Page 10 and 11: 1 I N T R O D U C T I O NAssociatio
Page 12 and 13: pumps. 2 x Howden 100-400 in the ri
Page 14 and 15: 3.1.2 R e v i e w o f C o n t a c t
Page 16 and 17: 9 SCHEDULE OF BLOCKS THAT IRRIGATE
Page 18 and 19: Maphobeni Farmers Association Repor
Page 24 and 25: Based on equation 1 above the flow
Page 26 and 27: ReducersThe inlet on the pump sucti
Page 28 and 29: d1.5d0.5dd3d 3d 1.5dFigure 9. Spaci
Page 30 and 31: hf6375kQ4d2……………………
Page 32 and 33: Table 1. Pump and motor specificati
Page 34 and 35: Table 2. Irrigation pumps evaluatio
Page 36 and 37: Phase two river pump station‣ Pum
Page 38 and 39: Filters: 3%Capital Recovery Rate (C
Page 40 and 41: 4.3.1 M a i n l i n e s i z eThe So
Page 42 and 43: 5 F I E L D E V A L U A T I O N O F
Page 44 and 45: 5.1.2 S p r i n k l e r p r e s s u
Page 48 and 49: Phase two booster Pumps running und
Page 50 and 51: The installation of this unit (on t
Page 52 and 53: Old AgePhase one of the irrigation
Page 54 and 55: The effects of different nozzles/em
Page 56 and 57: Interest RatesIt can be argued that
Page 58 and 59: 6 . 2 M a n a g e m e n t P r a c t
Page 60 and 61: 6 . 3 M a i n t e n a n c e S u r v
Page 62 and 63: 7 C O N S T R A I N T S T O E F F I
Page 64 and 65: phase one and two was found to be 1
Page 66 and 67: 8 R E C O M M E N D A T I O N STo e
Page 68 and 69: OVERALL MANAGEMENT AND MAINTENANCEM
Page 70 and 71: 10 L I T E R A T U R E R E F E R E
Page 72 and 73: 11 P R O D U C T I N F O R M A T I
Page 86 and 87: SEB usage for River pump station Ph
Page 88: Appendix 2: capital recovery factor

Service Contract No 2007 / 147-446 - Swaziland

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