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# Sizing Pipe And Valves

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### Sizing Pipe And Valves

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