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OSTP Pressure Distribution <br /> UNIVERSITY - <br /> Minnesota Pollution Design Worksheet OF MINNESOTA <br /> Control Agency <br /> I. Select Number of Perforated Laterals in system/zone: 3 �; ., hra R ' <br /> (2 feet is minimum and 3 feet is maximum spacing) r 'k:t _ s_ :1=/minimum <br /> 2'of <br /> 2. Select Perforation Spacing: 3.0 ft ,a.: .,� <br /> 3. Select Perforation Diameter Size <br /> Perforation 'le toVe <br /> Perforation swim no 3' <br /> 4. Length of Laterals =Media Bed Length-2 Feet. Perforation can not be closer then 1 foot from edge. <br /> 38 - 2ft = 36 ft <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 = 36 ft ÷ 3 ft = 12 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 = 12 Spaces + 1 = 13 Perfs. Per Lateral <br /> Check Table to verifty the number of perforations per lateral guarantees less than a 10%discharge variation. The value is double if <br /> the a center manifold is used. <br /> 7. Total Number of Perforations equals the Number of Perforations per Lateral (Lire 6)multiplied by the Number of <br /> Perforated Laterals (Line 1). <br /> 13 Perf.Per Lateral X 3 Number of Perf.Laterals = 39 Total Number of Perf. <br /> 8. Calculate the Square Feet per Perforation. Recommended value is 4-10 ft 2 per perforation. <br /> Perforation P <br /> Does not apply to At-Grades .error <br /> Bed Area = Bed Width(ft)X Bed Length(ft) "a0 WU .4 ,�,. 74, y. <br /> 1.0+ 0.15 0.41 0.56 0.74 <br /> 10 ft X 38 ft = 380 ft2 1.5 0.22 0.51 0.69 0.9 <br /> 2.04 0.2a Das 0.eo 1.04 <br /> 2.5 0.25 0.65 0.!! 1.17 <br /> Square Foot per Perforation =Bed Area divided by the Total Number of Perforations (line 7). 243 ax n o.a ,.x <br /> 4.0 0.3> 0.53 1.13 1A7 <br /> 380 ft2 _ 39 perforations = 9.7 ft2/ <br /> 5.04 1/41 and 3/41 inch perforation o,, <br /> pertoratiorn 1 faa, <br /> choettlnos <br /> 9. Select Minimum Average Head: 1.0 ft 2 feteIll <br /> bee parroted=°" °°°'"` <br /> 1/4 inch and 3/16 each peforado,n 01 SIS <br /> 3 fat 1/6 perforadam on 61575 <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 /> 39 Perforations X 0.74 GPM per Perforation 29 GPM <br /> 12. Select Type of Manifold Connection (End or Center): Q End 0 center <br />