Laserfiche WebLink
OSTP Pressure Distribution , <br /> UNIVERSITY <br /> Minnesota <br /> Control <br /> Pollution Design Worksheet OF MINNESOTA <br /> Project ID: v 11.09.22 <br /> 1. Select Number of Perforated Laterals In system/zone: �3 <br /> (2 feet Is minimum and 3 feet Is maximum spacing) <br /> 2. Select Perforation Spacing: 3.0 ft <br /> 1J' ..12 Shc covOl � A <br /> �J <br /> `',1 1 <br /> �� '/.-1>•-+,orWia.s Wacad 3'alwt t-. o17"rock 12- <br /> 3. Select Perforation Diameter Size 7/32 in <br /> B-of-k <br /> 4. Length of Laterals =Media Bed Length-2 Feet. P fixali=,Sizi,a: to Pe,tadti0,S„t=,t:_•to 3- <br /> 63 - 2ft = 61 It 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 Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br /> Perforations Per Lateral = 20 Spaces + 1 = 21 Perfs.Per Lateral <br /> Check table below to vitrify 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 /> Maximum Number of Perforation Per Lateral to Guarantee(1011 Disdwp Variation <br /> V,Inch Perforations 7132 Inch Perforations <br /> PerforationPipe'Diameter Unches) Perforation Spacing Pipe Diameter(Inches) <br /> Spacing(Feet) 1 1% lit 2 3 (Feet) I 116 11 1 3 <br /> 1 10 13 18 30 60 2 11 16 21 34 68 <br /> 211 8 12 16 28 54 21h 10 14 20 32 64 <br /> 3 8 12 16 25 52 3 9 14 1 19 30 60 <br /> 3/16 Inch Perforation 1/8 Inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) <br /> Perforation Spacing(Feet) 1 1% M 2 3 (Feet) 1 116 lit 2 3 <br /> 2 12 18 26 46 87 2 21 33 44 74 149 <br /> M 12 17 24 40 80 Zvi 20 30 41 69 135 <br /> 3 12 16 1 22 1 37 1 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 Number of Perf.Laterals = 63 Total Number of Perf. <br /> B. Calculate the Square Feet per Perforation. Recommended value Is 4-10 ft 2 per perforation. ^aro°^tim l,d a r, <br /> Does not apply to At-Grades <br /> 11«d Mq I,e t,M 1,u 'i. <br /> Bed Mea = Bed Width(ft)X Bed Length(ft) 10 au 0.41 0.10 0.7e <br /> 1.f an 031 0.N O.• <br /> 10 ft x 63 It 630 tt2 za 0126 a!e 0.00 ,Ae <br /> 1.5 CL" O." 9" 1.17 <br /> 7.0 0112 0.72 0." I.A <br /> Square Foot per Perforation =Bed Area divided by the Total Number of Perforations (Line 7). e.0 0.17 0.01 1.11 ,..7 <br /> ! O.e1 O.» 1:Id Ld0 <br /> 630 fe + 63 perforations a 10.0 ft2/perforatioru «Ikxd h311.Itch t6,1.Itch <br /> D-IMP with 118 Mth perbretbn <br /> p 2 feet Other eetehthbonem and NSrS with 3116 <br /> 9. Select Minimum Average Head: 1.0 1l MM to 114 MCh perWattbn <br /> 4 feet Other ettabUshnwes end hlsTs wiU 1/d Mch <br /> 10. Select Perforation Discha3w (GPM)based on Table III: 0.56 GPM per Perforation perferetMn <br /> 11. Determine required Flow Rate by multiplying the Total Number of Perforadons (Line 7)by the Perforation Discharge (Line 10). <br />