Irrigation Professionals with questions about ... - Hunter Industries

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Note: This 7-1/2 fps restriction is sometimes disregarded in the industrybecause service line is usually copper and is unlikely to be damaged bywater hammer. If you disregard this restriction, a check of actualpressure loss through the service line must be made to insure thepressure loss incurred due to high velocity is not excessive. Conversely,some areas will not allow a velocity as high as 7-1/2 fps -- check thelocal restrictions.Line #13 - Design Capacity: Lowest of the three flow rates listed onLines 10 - 12. The lowest flow rate is selected because this flow rate is theonly one that will not exceed any of the three restrictions on DesignCapacity: Pressure Loss Through the Meter, Volume Through the Meter,and Velocity Through the Service Line. List the lowest of the three flowrates on line #13.Sample Problem: 28 GPM
C. Calculate Dynamic Pressure at Design CapacityNow that a flow rate (Design Capacity) has been established, this flow ratecan be used to estimate the dynamic pressure at the Point of Connection.Pressure losses from the source to the POC include those through theservice line, delivery line, water meter, isolation valves, or other systemcomponents. Note: not all components listed are present in all systems.Line #14 - Pressure Loss in the Service Line: Determine thepressure loss in the service line.Sample Problem: 1-1/4 inch Type “K” CopperA) Turn to the chart for the type of service line used, page 9 in the<strong>Hunter</strong> Friction Loss Tables at the end of this design manual.B) Read down the left hand column (Flow GPM) to the designcapacity, line #13.Sample Problem: 28 GPMC) Read across to the right from that point to the column for PSIloss in 1-1/4” “K” copper.Sample Problem: 7.97 PSI per 100 ft.D) Record this in the first space on line #14.Sample Problem: 7.97E) Record the length of the service line in the second space on line#14, this information was recorded on line #5 of the worksheet.Sample Problem: 25 ft.F) Determine the pressure loss through the service line bymultiplying the pressure loss per 100 ft. times the length of theservice line and dividing the answer by 100 to find the actualPSI loss in the service line.Sample Problem:(7.97 x 25) = 1.99 PSI loss in the service line100G) Record this PSI loss on line #14 of the worksheet.Sample Problem: 1.99
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 and 46: Line #5 - Service Line: This is the
Page 47: Line #11 - Volume Through the Meter
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
Page 97 and 98: and flow rate, the smaller the spri
Page 99 and 100:
perpendicular (see Figure 33). Many
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“symmetrical” layout, and they
Page 103 and 104:
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
Page 113 and 114:
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
Page 121 and 122:
Pipe Sizing Using the Friction Loss
Page 123 and 124:
Backflow Preventer and Valve Sizing
Page 125 and 126:
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
Page 159 and 160:
Soil Intake RateSoil texture will p
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What You Need to KnowAs previously
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