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OSTP Pressure Distribution <br /> Minnesota Pollution Design Worksheet UNIVERSITY " . "-4< <br /> Control Agency OF MINNESQTA v 't..."•-:,-- <br /> Control <br /> Project ID: v 06.12.13 <br /> 1. Media Bed Width: 3 ft <br /> 2. Minimum Number of Laterals in system/zone= Rouded up number of[(Media Bed Width -4) = 3] + 1. <br /> ( 3 - 4 ) + 1 = 1 laterals Does not apply to at-grades <br /> 3. Designer Selected Number of Laterals: 3 laterals <br /> Cannot be less than line 2 (accept in at-grades) <br /> 4. Select Perforation Spacing: 3.0 ft " - <br /> k <br /> Mnxx <br /> ---,.17:1—t ,-,,, -_-/>--7 i <br /> 5. Select Perforation Diameter Size: 7/32 in - ,4—. <br /> 6. Length of Laterals =Media Bed Length - 2 Feet. <br /> 50 - 2ft = 48 ft Perforation can not be closer then 1 foot from edge. <br /> 7 Determine the Number of Perforation Spaces. Divide the Length of Laterals by the Perforation Spacing <br /> and round down to the nearest whole number. <br /> Number of Perforation Spaces = 48 ft ÷ 3 ft = 16 Spaces <br /> Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces. Check table <br /> 8. below to verify the number of perforations per lateral guarantees less than a 10%discharge variation. The <br /> value is double with a center manifold. <br /> Perforations Per Lateral = 16 Spaces + 1 = 17 Perfs. Per Lateral <br /> Maximum Number of Perforations Per Lateral to GuararMee<10%Discharge Variation <br /> '',Inch Perforations 7/32 Inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(inches) <br /> Perforation Spacing(Feet) i 14 11/2 2 3 (Feet) 1 iii 114 2 3 <br /> 2 10 13 18 30 60 2 11 16 21 34 68 <br /> 2/ 8 12 16 28 54 21 10 14 20 32 64 <br /> 3 8 12 16 1 25 52 3 9 14 19 30 60 <br /> 3116 Inch Perforations 1'8 Inch Perforations <br /> Perforation Spacing(Feet) Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) <br /> 1 11 12 2 3 (Feet) 1 114 11/2 2 3 <br /> 2 12 18 26 46 87 2 21 33 44 74 149 <br /> 2/ 12 17 24 40 80 2/ 20 30 41 69 135 <br /> 3 12 16 22 37 75 3 20 29 38 64 128 <br /> 9. Total Number of Perforations equals the Number of Perforations per Lateral multiplied by the Number of <br /> Perforated Laterals. <br /> 17 Perf. Per Lat. X 3 Number of Perf. Lat. = 51 Total Number of Perf. <br /> 10. Select Type of Manifold Connection (End or Center): End ❑ Center <br /> 11. Select Lateral Diameter(See Table): 2.00 in <br />