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Minnesota Pollution <br />Control Agency <br />OSTP Pressure Distribution <br />. k UNIVERSITY ., Des1gn Wor sheet oF MrNNEsorA ~- <br />Project ID: V 06.12.13 <br />1. Media Bed Width: ...___1_0 ___.ltt <br />2. Minimum Number of Laterals in system/zone= Rouded up number of [(Media Bed Width -4) + 3] + 1. <br />(l.___1_0 ___. -4)+1= ...._ __ 3_~1 lat~rals <br />3. Designer Selected Number of Laterals: <br />Cannot be less than line 2 (accept in at-Qrades) <br />...._ __ 3_~llate~ra_l_s ----------1----~ <br />4. Select Perforation Spacing: 1 3.0 1ft <br />5. Select Perforation Diameter Size: <br />~in <br />6. Length of Laterals = Media Bed Length -2 Feet . <br />7. <br />8. <br />...___6_3 ___.I -2ft = 1.___6_1 ___.In Perforation can not be closer then 1 foot from edge. <br />Determine the Number of Perforation Spaces . Divide the Length of Laterals by the Perforation Spacing <br />and round down to the nearest whole number. <br />Number of Perforation Spaces 1 61 ltt + I 3 In = I 20 I spaces <br />Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces. Check table <br />below to verify the number of perforations per lateral guarantees less ;ha/ 10% di;charge variation. The <br />value is double with a center manifold. <br />. Perforations Per Lateral =I 20 !spaces + 1 = 21 Perfs. Per Lateral <br />.. .. /il .. ~ximum N~mber l:if Perforations Per Lateral to Guar~r.tee <l_():11 Discharge Variat ion .:·' -C . . .. .. . . <br />'I , Inch Pertoratiom 7132 Inch Perforations <br />Pe rfo rat ion Spa d ng (Fe.,t) Pipe Diameter (Inches) Perforation Sp<1cini Pipe Diameter (lnche;) <br />I 1\i rn 2 3 (Feet) f rn m 2 •· 3 <br />.. 't ·10 . 0 <br />: •• ,;13 : 18 ,30 ... 60 '" .:2 1 I 1~ . '.' ·21 I · -:34 .. ~8, ... . ' -• '. <br />211 8 12 16 28 5-l 2~~ 10 14 20 32 6-l <br />. ~ 3 ,. .. <br />8 · 12 H, : 25 · · 52, :3 . ·,9 .. 14 .19 _j o ., 60 . ' -. :-.. <br />3/16 Inch Perforation, 1 /8 Inch Perforar.ons <br />Pipe Diametoff (Inche s) Perforation Spu:in~ Pipe Dic1meter (Inches) <br />Perforat ion Spa ci ng (Feet) <br />1 m 1½ 2 3 (fe€t) I n~ 1\'i 2 3 <br />2 . 12 .:rn ·26 Ao · '~7 ' :2 : 21 ' ;33 44 14 149 .. , <br />m 12 17 2-1 ◄O 80 2'' " 20 30 41 69 135 <br />3 ,· .. .12 .. · f6 ·.'i1 · -,37 :75 . ·3 .. :20 29 . 38 64 ··,128 <br />9. Total Number of Perforations equals the Number of Perforations per Lateral multiplied by the Number of <br />Perforated Laterals. <br />....__2_1_~IPerf. Per Lat. X L..l __ 3_~jNumber of Perf. Lat.= .___6_3_~jTotal Number of Perf . <br />10. Select Type of Manifold Connection (End or Center): 0 End D Center <br />11. Select Lateral Diameter (See Table): 2.00 lin <br />I/ . <br />' <br />'