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OSTP Pressure Distribution <br /> Minnesota Pollution Design WorksheetUNIVERSITY <br /> Control Agency OF MINNESOTA .L.��.. <br /> Project ID: v 03.19.15 <br /> 1. Media Bed Width: 10 ft <br /> 2. Minimum Number of.Laterals in system/zone= Rounded up number of[(Media Bed Width - 4) : 3] + 1. <br /> 4 ) + 1 = laterals Does not apply to at-grades <br /> 3. Designer Selected Number of Laterals: laterals <br /> Cannot be less than line 2 (accept in at-grades) <br /> 4. Select Perforation Spacing: 3.0 ft - -_ <br /> 5. Select Perforation Diameter Size: 1/4 in - -� <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 _ 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 /> Am inim Nwiw of Perforations Per lateral to Guarantee<10%Discharge Variation <br /> .Wh Perforations 7/321nchPerforations <br /> Perforation Spacing{Feet) PipeDiameter Ikxhes) Perforation Spacing Pipe Diameter(Whes) <br /> _7T I$A lit 2 3 (Feet) t 11f R.- 2 3 <br /> 2 10 13 18 30 60 2 11 16 21 34 68 <br /> 21� a 12 16 28 54 2v; 10 14 20 32 64 <br /> 3 8 12 16 25 52 3 9 14 19 30 60 <br /> 3'16 kxh Perforations 1'8 IrKh Perforations <br /> Perforation Spk*(Feet) Pipe Diameter(Mr_ e ) Perforation Spacing ripe Diameter(Mches) <br /> 1 11t 11; 2 )7 {Feet) 1 ltd 1Y., 2 3 <br /> 2 12 18 26 46 87 2 21 33 44 74 149 <br /> Dt 12 17 24 40 80 2t: 20 30 41 69 135 <br /> 3 12 1 16 22 37 1 75 3 1 20 1 29 38 64 1 128 <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 Number of Perf. Lat. = 51 Total Number of Perf. <br /> 10. Select Type of Manifold Connection (End or Center): : End C Center <br /> 11. Select Lateral Diameter (See Table): 2.00 in <br />