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OSTP Pressure Distribution <br /> UNIVERSITY ��i� �`�� <br /> Minnesota Pollution • <br /> Control Agency Design Worksheet OF MINNESOTA 'N., - <br /> Project ID: v 12.08.06 <br /> 1. Media Bed Width: 10 ft <br /> 2. Minimum Number of Laterals in system/zone=[(Media Bed Width(Linel)-4)+3] +1 round up to the neareast whole number+1. <br /> ( 10 -4)+ 1 = 3 laterals <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 /> 5. Select Perforation Diameter Size: 7/32 in p„„„,„,„„,,,,,,,,3...,,.,„ IM 7;nrk _ J ,z <br /> 6. Length of Laterals =Media Bed Length-2 Feet. 1 4-or.«k <br /> Perforation.1210g.'I-to'/.. Porforaoon norirn)::.of <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge. <br /> 7. Determine the Number of Perforation Spaces. Divide the Length of Laterals (Line 6)by the Perforation Spacing (Line 4)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spaces = 61 ft 3 ft = 20 Spaces <br /> Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces (Line 7). Check table below to verify the <br /> 8' number of perforations per lateral guarantees less than a 10%discharge variation. The value is double with a center manifold. <br /> Perforations Per Lateral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Maximum Number of Perforations Per Lateral to Guarantee(1016 Discharge Variation <br /> V,Inch Perforations 7132 Inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) <br /> Perforation Spacing(Feet) 1 141 115 2 3 (Feet) t 114 111 2 3 <br /> 2 10 13 18 30 60 2 11 16 11 34 68 <br /> 2u 8 12 16 28 54 2144 10 14 20 32 64 <br /> 3 8 12 16 25 52 3 9 14 19 30 60 <br /> 3:16 Inch Perforations 1/8 inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter cinches) <br /> Perforation Spacing(Feet) <br /> 1 1 lit 2 3 (Feet) I 94 ivz 2 3 <br /> 2 42 18 26 46 87 2 21 33 44 74 149 <br /> 21t 12 17 24 40 80 21,i 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 (Line 8)multiplied by the Number of <br /> Perforated Laterals (Line 3). <br /> 21 Perf. Per Lateral X 3 Number of Perf. Laterals = 63 Total Number of Perf. <br /> 10. Select Type of Manifold Connection (End or Center): I End ❑ center <br /> 11. Select Lateral Diameter(See Table): 2.00 in <br />