Laserfiche WebLink
OSTP Pressure Distribution R,a, <br /> Minnesota Pollution UNIVERSITY <br /> Control Agency Design Worksheet OF MINNESOTA ;:,.,a <br /> Project ID: v 11.09.22 <br /> 1. Select Number of Perforated Laterals in system/zone: --- <br /> (2 feet is minimum and 3 feet is maximum spacing) <br /> 2. Select Perforation Spacing: 3.0 ft ��� "' r�r F- iF9 <br /> / ''' _ -�_ - - <br /> J.,.r�um/:'1n rluratirnrt cy. of rock 12- <br /> 3. Select Perforation Diameter Size 7/32 in _ 64. Length of Laterals =Media Bed Length-2 Feet. nrfur.t;nh nt1V..rfpra,;u„'p-im'.2'to <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 ft = 20 Spaces <br /> 6. Number of Perforatlons per Lateral is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br /> Perforations Per Lateral = 20 Spaces + 1 = E=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 /> Kaxirum,Number of Pe}-foratians Per Lateral to Guarantee:ii:►yi Discharge Variat0n <br /> inch PE-tora7:0ns 7132 Inn Perforation <br /> Pe-fcration Spacing(Feet) Pip*�ameter(fnchesl Perforation Spacing Pipe D-arneter finches) <br /> ' 1t tl 2 3 (Feet! 2 3 <br /> 2 i0 13 18 30 60 2 1i 16 N 34 68 <br /> 2': 8 12 16 28 54 2s 10 14 20 32 64 <br /> 3 8 12 16 25 52 3 9 14 19 30 60 <br /> 3:`16 Inch Per oraticns I T Inch Pe-terat?ons <br /> Pipe Diameter(Inches) Perforation 5 acipe Dng Pi <br /> Gerfara�an Spacng Sfwt) P arneter(inches) <br /> 1 11 1;t 2s IFeet) 1 i? 9F. 2 3 <br /> 2 12 18 26 46 87 2 21 33 44 74 149 <br /> 21t 12 i7 24 40 80 2f 20 30 41 69 135 <br /> 3 12 16 22 37 75 3 20 29 38 64 128 <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 C _1 Number of Perf. Laterals = 63 Total Number of Perf. <br /> 8. Calculate the Square Feet per Perforation. Recommended value is 4-10 ft 2 per perforation. 'w~eh Offch-V f0PM) <br /> Does not apply to At-Grades Perf-tton oto t9r <br /> N4.O <br /> B.1 <br /> Bed Area = Bed Width(ft)X Bed Lergth(ft) 0.180.22 0.69 09 <br /> ft xft = ftz 0.260.29 0.89 117 <br /> 3.0 0.32 <br /> Square Foot per Perforation =Bed Area divided by the Total Number of Perforations (Line 7). 0.77 01.13 1.1.47 <br /> 5.01 0.41 0.97 1.26 1.65 <br /> 630 <br /> ftZ - 63 perforations c 10.0 ft2lperforations ;m"tirnth'/16in`hta141Kh <br /> Dwellings with t/a imh Serf-ti- <br /> 9. Select Minimum Average Bead: 1.0 ft 2 feet Other rAabiishtnents and LASTS with 3/16 <br /> inch to 1/4 inch p"'4110M <br /> 5 feet Other tablish-ts d MSTS wtth 1/8 mh <br /> perforationsHan <br /> 10. Select Perforation Discharge (GPM)based on Table IIi: 0.56 GPM per Perforation <br /> 11. Determine required Flow Rate by multiplying the Total Number of Perforations (Line 7)by the Perforation Discharge (Line 10). <br />