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OSTP Pressure Distribution .}:_ ., '}:>,,:.
<br />Minnesota Pollution Design Worksheet UNIVERSITY ~:~!~tJ
<br />Control Agency OF MINNESOTA "'\..~
<br />Project ID: V 06.12.13
<br />1. Media Bed Width: I 10 ltt
<br />2. Minimum Number of Laterals in system/zone = Rouded up number of [(Media Bed Width -4) + 3] + 1.
<br />d 10 I -4)+1= I 3 ltaterals Does not apply to at-grades
<br />3. Designer Selected Number of Laterals : I 3 l1aterals
<br />Cannot be less than line 2 (acceot in at-qrades) -----h--~
<br />tn•.,J.,t.--.1,;;;.:,b,. ~ .. ,
<br />4. Select Perforation Spacing: I 3.0 ltt .:, ·;'/::f h/:\;·"?::::_:'?i.:.~L::-<-;,'.'rfGr'id
<br />-. . . rMmbn,un ..Jy-,,~-
<br />I
<br />·,.~ pr,101.,1,,.n\ -;f>,1n•,I \' ,,1,.u1 t~.;,-ntmdr.
<br />Select Perforation Diameter Size: lin --5. 7/32 -·.·l ,,-nf1~k
<br />,,_.,.1,,,,1t.-t,n\i,•u,1r ·1,• ,,~•;, .. 1..-.rfol,Olt<uo ~,,.,,1m1• :•• In l'
<br />6. Length of Laterals = Media Bed Length -2 Feet.
<br />I 63 I -2ft = I 61 In Perforation can not be closer then 1 foot from edge.
<br />7. 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 Pert oration Spaces 1 61 In + I 3 ltt = I 20 !spaces
<br />Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces. Check table
<br />8. below to verify the number of perforations per lateral guarantees less than a 10% discharge variation. The
<br />value is double with a center manifold.
<br />Perforations Per Lateral =I 20 !spaces + 1 = I 21 lPerfs. Per Lateral
<br />/1\a>timumNumber of Perforations Per Lateral to Guarante€ <1~ Discharge Variation
<br />'i, Inch Pertoranom 7132 Inch Perforatiom
<br />Perforati-0n Spacing !Feet)
<br />Pipe Diameter (lnc~t€s) Perforation Spacing Pipe Diameter (Inches!
<br />j rn H'i 2 3 (Fe1:tl 1 m m 2 3
<br />2 . 10 t3 18 30 60 2 11 16 21 34 68
<br />2l~ 8 12 16 28 54 2~1 to 14 20 32 64
<br />1 8 . 12 16 25 52 3 9 14 19 30 60
<br />3/ t 6 Inch Perforations 1/8 Inch Perforations
<br />Perforation Spacing IFe..t)
<br />Pipe Diameter (Inches) F'erforation Spacing Pipe Diameter (Inches)
<br />1 rn 1½ 2 3 (Feet! I IV. 1h 2 1 ,
<br />2 12 18 26 46 87 2 21 33 44 74 149
<br />m 12 17 24 40 80 2~~ 20 JO 41 69 m
<br />3 12 16 22 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 />I 21 jPerf. Per Lat. X I 3 jNumber of Perf. Lat. = I 63 lrotal Number of Perf.
<br />10. Select Type of Manifold Connection (End or Center): 0 End □ Center
<br />11. Select Lateral Diameter (See Table): I 2.00 jin
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