Laserfiche WebLink
OSTP Pressure Distribution <br /> UNIVERSITY A'�"`-` <br /> Minnesota Pollution <br /> J <br /> Control Agency Design Worksheet OF MINNESOTA <br /> Project ID: v 11.09.22 <br /> 1. Select Number of Perforated Laterals in systernIzone: <br /> (2 feet is minimum and 3 feet is maximum spacing) <br /> 2. Select Perforation Spacing: 3 0 ft <br /> Min mum <br /> '/,'P-1.,.fin.spaced 3'apart <br /> 3. Select Perforation Diameter Size in i - <br /> 6-wf rock <br /> 4. Length of Laterals =Media Bed Length-2 Feet. perforati.. W.0!-/."to•I.- Pedorwtlon spat:hvq:2'to 3' <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge. <br /> 5. Determine the Number of Perforation Spaces. Divide the Length of Laterals (Line 4)by the Perforation Spacing (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spaces = 61 ft + 3 ft = 20 Spaces <br /> 6. Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br /> Perforations Per Lateral = 20 Spaces + I = 21 Perfs. Per Lateral <br /> Check table below to verify the number of perforations per lateral guarantees less than a 10%discharge variation. The value is <br /> double If the a center manifold Is used. <br /> ftwinm Rtm*w of Perforatiom Per-Waal to Gwar tee 00%Discharge Variation <br /> t.Inch Perforations 7132 Inch Perforations <br /> Perforation Spacing(Feet) Pipe Diameter(Inches) Perforation Spacing Pipe Diaineter(Incl*s) <br /> i 116 lit 2 3 (Feet) I 116 ilt 2 3 <br /> 2 10 13 18 30 60 2 ti 16 21 34 69 <br /> N 8 12 16 28 54 2Y 10 14 20 32 64 <br /> 3 8 12 16 .25 52 3 9 14 19 30 60 <br /> 3116 Inch Perforations 1/8 Inch Perforations <br /> Perforation Spacing(FW,) Pipe Diameter(Inches) Perforation Sparing Pipe Diameter(Inches) <br /> I IJA Ot 2 3 (Feet) 1 114 % 2 3 <br /> 2 12 19 26 46 87 2 21 33 44 74 149 <br /> n 12 U 24 40 go 2% 20 30 41 69 135 <br /> - 3 12 16 1 22 1 37 75 -T- 3 20 29 1 38 64 128d <br /> 7. Total Number of Perforations equals the Number of Perforations per Lateral (Line 6)multiplied by the Number of <br /> Perforated Laterals (Line 1). <br /> 21 Perf. Per Lateral X Number of Perf. Laterals Me 63 Total Number of Perf. <br /> 8. Calculate the Square Feet Per Perforation. Recommended value Is 4-10ft2 per perforation. Perteration DUcharge(GPM) <br /> Does not apply to At-Grades Head 00 Fork""M Dierneter <br /> Bed Area = Bed Width(ft)X Bed Length(ft) <br /> 1.91 0.18 0.41 0.56 <br /> IS 0.22 0.31 0.69 0.9 <br /> 10 ft X 63 ft 630 fe 2.61 0.26 0.59 .040 1.04 <br /> 2.5 a." 0.65 0.89 _1.17 <br /> 2.0 0.32 0.72 09 <br /> Square Foot per Perforation =Bed Area divided by the Total Number of Perforations (Line 7). 4.0 0.27 0.83 t.138 1.47 1.28 <br /> SO 0.41 1 0.93 4.26 1.65 <br /> 630 I foot Dwelling Mth 3/16irwh to 114 imh <br /> ft2 + perforations fe/peTforations ped-tioes <br /> DweIfinp with I la inch perforittim <br /> 2 feet Other emsbUshnients midAsTS with.3/16 <br /> 9. Select Minimum Average Head: ft Inch to 14 inch perforatbm <br /> 5,.,.t Other atelAishments 80d AISTS vd,11 I IS inch <br /> 10. Select Perforation Discharge (GPM)based on Table III: 0.56 GPM per Perforation Perforations <br /> 11. Determine required Flow Rate by multiplying the Total Number of Perforations (Line 7)by the Perforation Discharge (Line 10). <br />