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Minnesota Pollution <br />_Control Agency <br />OSTP Pressure Distribution <br />Design Worksheet <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 <br />3. Select Perforation Diameter Size 1/4 in <br />4. <br />5. <br />6. <br />UNIVERSITY <br />OF MINNESOTA <br />\1 <br />V11 <br />`y t.. .. i. 7 <br />�. y .`,.•� <br />-7, <br />V 4p- 11":2s Of r -k <br />{ 7 6" W rock <br />Length of Laterals = Media Bed Length - 2 Feet. t P«lo,�t int uhx,: „• . �,a,, o ,p,t M,:: to 3 <br />38 - 2ft = 36 ft Perforation can not be closer then 1 foot from edge. <br />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 - 36 ft It = 12 Spaces <br />Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br />Perforations Per Lateral = 12 Spaces + 1 = <br />13 Perls. 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 />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 />13 Perf. Per Lateral X Number of Perf. Laterals 39 Total Number of Perf. <br />8. Calculate the Square Feet per Perforation. Recommended value Is 410 ft z per perforation. pwf° t n obdunp 1614' <br />Does not apply to At -Grades ""foi1vnD1nM" <br />tw.e UU ,�. '�. 'h, ti. <br />Bed Area = Bed Width (ft) X Bed Length (ft) 1& 0.13 0.+1 o.es 0.74 <br />/.s o.0 0.51 649 0./ <br />10 ft x 38 ft = 380 fe zct 0.26 0.5s OAD 1.04 <br />:.S 0." 0.6% 0.„ 1.17 <br />7.0 0.7: 0.72 0." <br />Square Foot per Perforation = Bed Area divided by the Total Number of Perforations (Line 7). {.D 0.37 0.93 <br />s. <br />OAS 1 o.n I <br />,.2t 1.t3 <br />380 ftZ f 39 orations _ 9.7 "°°° Dweft twlthl/16inch to 114 Inch <br />P fe/perforations P.trttWiom <br />Dweh<ttp with 1 /E Inch perfomdom <br />2 "t Dth.r atshlhhments -d AA TS whh 3116 <br />9. Select Minimum Average Head: 1.0 ft Foch to //t loth P.rromtbm <br />s foci airr «Whir et n .nor ruts wxn 1 n k ch <br />Perromtioru <br />10. Select Perforation Discharge (GPM) based on Table III: 0.74 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 />Maxirtarn <br />Number of Perforations <br />Per Lateral to Guarantee <10% Disdwr Variation <br />`.Inch <br />Perforations <br />7/32 Inch Perforations <br />PerforationPipe <br />Spacing (feet} <br />Diner (Inches) <br />Perforation Spacing <br />(Feet) <br />Pipe Diameter (inches) <br />1 114 I m 2 3 <br />I 114 iv: 2 <br />3 <br />2 <br />10 <br />13 18 30 <br />60 <br />2 <br />if <br />16 21 <br />34 <br />68 <br />21� <br />8 <br />12 16 28 <br />54 <br />214 <br />10 <br />14 20 <br />32 <br />64 <br />3 <br />8 <br />12 16 25 <br />52 <br />3 <br />9 <br />14 19 <br />30 <br />60 <br />3!16 Inch Perforations <br />1!8 Inch Perforations <br />Perforation Spacing (Feet) <br />1 <br />Pipe Diameter (Inches) <br />i'A 94 2 <br />3 <br />Perforation Spacing <br />(Feet) <br />Pipe Diameter <br />(Inches) <br />1 114 lit 2 <br />3 <br />2 <br />12 <br />18 26 46 <br />87 <br />2 <br />21 <br />33 44 <br />74 <br />149 <br />n 1 <br />12 <br />17 24 40 <br />80 <br />2i <br />20 <br />30 41 <br />69 <br />135 <br />3 1 <br />12 <br />1 16 1 22 37 <br />1 75 <br />3 <br />20 <br />29 38 <br />64 <br />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 />13 Perf. Per Lateral X Number of Perf. Laterals 39 Total Number of Perf. <br />8. Calculate the Square Feet per Perforation. Recommended value Is 410 ft z per perforation. pwf° t n obdunp 1614' <br />Does not apply to At -Grades ""foi1vnD1nM" <br />tw.e UU ,�. '�. 'h, ti. <br />Bed Area = Bed Width (ft) X Bed Length (ft) 1& 0.13 0.+1 o.es 0.74 <br />/.s o.0 0.51 649 0./ <br />10 ft x 38 ft = 380 fe zct 0.26 0.5s OAD 1.04 <br />:.S 0." 0.6% 0.„ 1.17 <br />7.0 0.7: 0.72 0." <br />Square Foot per Perforation = Bed Area divided by the Total Number of Perforations (Line 7). {.D 0.37 0.93 <br />s. <br />OAS 1 o.n I <br />,.2t 1.t3 <br />380 ftZ f 39 orations _ 9.7 "°°° Dweft twlthl/16inch to 114 Inch <br />P fe/perforations P.trttWiom <br />Dweh<ttp with 1 /E Inch perfomdom <br />2 "t Dth.r atshlhhments -d AA TS whh 3116 <br />9. Select Minimum Average Head: 1.0 ft Foch to //t loth P.rromtbm <br />s foci airr «Whir et n .nor ruts wxn 1 n k ch <br />Perromtioru <br />10. Select Perforation Discharge (GPM) based on Table III: 0.74 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 />