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Sizing Pipe And Valves
 

Sizing Pipe And Valves

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    Sizing Pipe And Valves Sizing Pipe And Valves Presentation Transcript

    • Sizing pipe and valves
    • Velocity
      • Safety limit for pipe is 5 ft/second
      • Look at chart on page 66 of Rainbird Landscape Irrigation Design Manual
      • Find where the velocity exceeds 5 ft/second
      • We must select pipe that doesn’t exceed this amount
    • Example pg 65
      • First circuit is 4 heads on one valve
      • Straight line lateral circuit – least efficient
      • Radius of sprinklers is 47 ft
      • 55 psi
      • 9.8 gpm
      • Wants to use class 200 PVC pipe
    • Size in Reverse
      • Called critical circuit length
      • Section D, farthest away
        • 9.8 gpm
        • Cannot exceed 5 ft/s
        • Look on the chart for the smallest pipe that can carry 9.8 gpm and not exceed 5 ft/s
        • ¾” pipe can carry 10 gpm with a velocity of 4.72 ft/s
    • Section C
      • Supplies two sprinklers
        • 9.8 gpm x 2 = 19.6 gpm
      • Look at the chart
        • What is the smallest size that can handle 19.6 gpm and not exceed 5 ft/s
        • 1 ¼” pipe
    • Section B
      • Three sprinklers
        • 9.8 x 3 = 29.5 gpm
        • 1 ½” pipe
      • Section A
        • 9.8 x 4 = 39.2 gpm
        • 2” pipe
    • Size Circuit #2
      • Compare to Circuit #1
      • Advantages to splitting the circuit, smaller pipe sizes, less gpm needed