Irrigation Professionals with questions about ... - Hunter Industries

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SAMPLE PROBLEM(PUMP SYSTEMS)Design Capacity and Working Pressure WorksheetCALCULATING DESIGN CAPACITY AND DYNAMIC PRESSUREA. Record Site Information1 Dynamic pressure at the discharge point 70 PSI2 Pump available flow at discharge point 15 GPM3 Net elevation change (discharge to POC) ± + 18 FEET (+uphill, - downhill)4 Pressure change due to elevation: Line 3 x 0.433 = - 7.79 PSI5 Pressure at POC: Line 1 +/- Line 4 = 62.21 PSINumber/Length Size Type6 Delivery Line 65 ft. 1 in. Sch 40 PVC7 Isolation Valves -- -- --8 Other -- -- --B. Determine Design Capacity GPM WithFactor Restriction Restriction9 Pump/Well GPM capacity Continuous supply available atdischarge point (Line 2) 15.0 GPM10 Pump Safety Factor Not to exceed 90% of continuous supplyavailable at discharge point 15.0 x 0.10= 1.5 GPM11 Design Capacity (subtract Line 10 from Line 9) 13.5 GPMC. Calculate Dynamic Pressure at Design CapacityPressure Losses from Discharge Point to the POC12 Pressure reduction 10% as Pump Safety Factor 70 x 0.10 = 7.0 PSI13 Pressure loss in the Delivery Line 4.19 PSI loss (per 100' ) 65 ft./100 = 2.72 PSI14 Pressure loss in the Isolation Valves: Equivalence factorxPSI loss per 100' ofstandard steel/100x Number of valves = -- PSI15 Other pressure losses_____________________________ = -- . PSI16 Pressure loss from the discharge point to POC (add Lines 12 through 15) 9.72 PSI17 Approximate Dynamic Pressure at Design CapacityDynamic pressure at the POC (Line 5 above) 62.21 PSISubtract the PSI lost from the discharge point to the POC (Line 16) 9.72 PSIApproximate Dynamic Pressure at Design Capacity 52.99 PSI
D. Estimate Pressure Available at “Worst-Case” Head18 Pressure change due to elevation change from the POC to thehighest head in the system. 10 ft. x 0.433 = 4.33 PSI19 Pressure subtotal (subtract Line 18 from Line 17; for worst caseheads which are lower than the POC, add Lines 17 and 18) 48.66 PSI20 Estimated Pressure Available at worst case-headtwo-thirds of subtotal: Line 19 48.66 PSI x 0.67 = 32.60 PSIPressure Available for Sprinkler Selection and Operation32.60 PSI
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Irrigation Professionals with quest
Page 3 and 4:
Plot PlansIntroductionOne of the mo
Page 5 and 6:
Drawing ToolsThere are just a few t
Page 7 and 8: Measure the PropertyTake careful me
Page 9 and 10: Trees, water meters, and other item
Page 11 and 12: Step 2 - Redraw On Graph PaperThe n
Page 13 and 14: SymbolsIn order to distinguish betw
Page 15 and 16: Make sure the drawing is dated and
Page 17 and 18: Step 4 - Group Sprinklers Into Zone
Page 19 and 20: Basic HydraulicsIntroductionHydraul
Page 21 and 22: How Pressure is Created By the Weig
Page 23 and 24: Does the Shape or Size of the Conta
Page 25 and 26: L O W24 VAC 50-60 Hz60mA INRUSH60mA
Page 27 and 28: Factors Affecting Dynamic PressureW
Page 29 and 30: INSIDE DIAMETER (i.d.) of the pipe:
Page 31 and 32: LENGTH is the fourth factor affecti
Page 33 and 34: D) SDR -Standard Dimension Ratio -
Page 35 and 36: 1. Look in the left column (FLOW G.
Page 37 and 38: SummaryThere is a limited amount of
Page 39 and 40: DefinitionsUse the diagram below al
Page 41 and 42: Calculating Dynamic Pressure at Des
Page 43 and 44: D. Estimate Pressure Available at
Page 45 and 46: Line #5 - Service Line: This is the
Page 47 and 48: Line #11 - Volume Through the Meter
Page 49 and 50: C. Calculate Dynamic Pressure at De
Page 51 and 52: Line #16 - Pressure Loss in the Wat
Page 53 and 54: Line #21 - Pressure Change Due to E
Page 55 and 56: Design ProblemMany times, you will
Page 57: III. Systems Supplied by a PumpCalc
Page 61 and 62: Line #5 - Pressure at POC: If the P
Page 63 and 64: Sample Problem: 13.5 GPMC) Read acr
Page 65 and 66: D. Estimate Pressure Available at"W
Page 67 and 68: (METERED SYSTEMS)Design Capacity an
Page 75 and 76: (PUMP SYSTEMS)Design Capacity and W
Page 77 and 78: (PUMP SYSTEMS)Design Capacity and W
Page 79 and 80: Sprinkler SelectionIntroductionThe
Page 81 and 82: Spray HeadsFixed spray heads may be
Page 83 and 84: Selecting the Proper SprinklerNow t
Page 85 and 86: Precipitation RateExpressed in inch
Page 87 and 88: Sprinkler Watering PatternsMost spr
Page 89 and 90: Choosing Nozzles for Gear Driven Ro
Page 91 and 92: 5) Sprinkler Watering Patterns - Be
Page 93 and 94: HydrozonesA hydrozone is a portion
Page 95 and 96: Triangular spacing is usually the p
Page 97 and 98: and flow rate, the smaller the spri
Page 99 and 100: perpendicular (see Figure 33). Many
Page 101 and 102: “symmetrical” layout, and they
Page 103 and 104: Head spacing in narrow areas is det
Page 105 and 106: Head placement is complicated becau
Page 107 and 108: Figure 40PGJ
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On larger slopes, a combination of
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SummarySprinkler head placement is
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Backflow PreventionIntroductionBack
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System LayoutLaying out a system be
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Backflow Preventer LocationLocal pl
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time. Station run time can be tempo
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Pipe Sizing Using the Friction Loss
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Backflow Preventer and Valve Sizing
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Friction LossesIntroductionCalculat
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5. Multiply your answer by the leng
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Friction Loss CalculationsZone Numb
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Sample Problem:1.67= 0.0167 psi los
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Step 2Step 3Step 4Step 5Step 6Sprin
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Using the acceptable 10% allowance:
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SummaryCalculating the friction los
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Precipitation RatesIntroductionToda
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Sprinkler Precipitation RatesVersus
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Area CoveredArc by Sprinkler Flow90
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The Sprinkler Spacing MethodThis me
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Use of Precipitation Rates in Lands
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Irrigation SchedulingIntroductionUl
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Crop coefficient. Different plants
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ET Evaporation of soil surface wate
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Soil Intake RateSoil texture will p
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What You Need to KnowAs previously
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