Irrigation Professionals with questions about ... - Hunter Industries

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B. Determine Design CapacityThe Design Capacity is the maximum flow rate available for systemoperation. There are three factors that restrict the available flow (GPM) ina landscape irrigation system:1) Pressure loss through the water meter - because pressure is limited tothat available at the main, no more than 10% of that pressure should beexpended through the meter.2) Volume through the water meter - because a safety margin for possiblechanges in the system or for other uses on the project should beincluded in the design, no more than 75% of the maximum safecapacity of the meter should be used for irrigation.3) Velocity through the service line - because excessive water velocity canresult in excessive pressure losses and potential system failure, velocitythrough the service line should be limited to 7.5 feet per second (fps).Lines 10 -12 will determine a maximum flow under each restrictive factor.The Design Capacity is the lowest of these three flow rates.Line #10 - Pressure Loss Through the Meter: Limited to 10%of Static Pressure at the Source:Sample problem: 1 inch meterA) Determine 10% of the pressure at the main by multiplying 10%(0.10) times the PSI at the main, line #1 (85 PSI).85.0 x 0.10 = 8.5 PSI allowable loss through the water meterB) Turn to page 11 for the chart “Pressure Loss Through WaterMeters” in the Hunter Friction Loss Tables at the end of thisdesign manual.C) Select the column for 1 inch water meters.D) Read down the column until pressure loss is as close to theallowable loss (8.5 PSI) without exceeding it.E) Read across to left hand column to determine the volume at thatpoint (36 GPM).F) Record 36 GPM on line #10 of the worksheet.
Line #11 - Volume Through the Meter: Limited to 75% of WaterMeter CapacitySample problem: 1 inch water meterA) Turn to page 11 for the chart “Pressure Loss Through WaterMeters” in the Hunter Friction Loss Tables at the end of thisdesign manual.B) Locate the column for size of water meter (1 inch).C) Read down the pressure loss column under 1 inch meters untilpressure loss figures stop.D) Read across to left hand column to determine the volume at thatpoint (50 GPM). This represents the maximum safe flow for thatsize meter.E) Determine 75% of maximum safe flow by multiplying the flowby 75% (0.75).50 GPM x 0.75 = 37.5 GPMF) Record 37.5 GPM on line #11 of the worksheet.Line #12 - Velocity in the Service Line: This is the friction lossdue to the speed at which water flows through the service line. Becauseexcessive water velocity can result in excessive pressure losses andpotential system failure, velocity through the service line is limited to 7.5Feet Per Second (fps)*.Sample Problem: 1-1/4 inch Type “K” CopperA) Turn to the chart for the type of service line used, page 9 in theHunter Friction Loss Tables at the end of this design manual.B) Locate the column for the size of service line (1-1/4 inch).C) Read down the column for velocity (fps) until the velocityreaches 7.5 fps (or as high a velocity as listed without exceeding7.5 fps).D) Read across from that point to the left hand column todetermine volume (GPM) at allowed 7.5 fps (28 GPM).E) Record 28 GPM on line #12 of the worksheet.
Page 1 and 2: 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: Line #5 - Service Line: This is the
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 and 58: III. Systems Supplied by a PumpCalc
Page 59 and 60: D. Estimate Pressure Available at
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
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and flow rate, the smaller the spri
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perpendicular (see Figure 33). Many
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“symmetrical” layout, and they
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Head spacing in narrow areas is det
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Head placement is complicated becau
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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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