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. w.., <br /> � � <br /> . OSTP Pressure Distribution <br /> UNIVERSITY ` <br /> Minnesota Pollution Design Worksheet OF MINNESOTA <br /> Control A enc �-�,r�s <br /> ProjectlD: v 11.09.22 <br /> 1. Select Number of Perforated Laterals in system/zone: �� _------- <br /> (2 feet is minimum ond 3 feet is maximum spacing) "'""""''""`"'"' <br /> �� �; '� r ` <br /> 2. Select Perforotion Spacing: 3.0 ft "" . . , ,'S�, �, -- <br /> � �� <br /> ^ Mmi���uin <br /> �� '/."pe�tor:�trnnv s�i.��i�d 3''.�µvt 1").•ol rock � � �7- <br /> 3. Setect Perforation Diameter Size 7/32 in _ _ <br /> G"�trock <br /> 4. Length of Latera(s =Media Bed Length -2 Feet. �������.,����� nJ:'1"to b�" Perbr.nion tp.innq'Z'��; - <br /> 63 - 2ft = 61 ft Perforotion can not be c(oser then 1 foot from edge. <br /> 5• Determine the Number of Perforotion Spoces. Divide the Length of Laterols (Line 4)by the Perforation Spncing (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 Latera( is equal to 1.0 ptus the Number of Perforation Spaces (Line 5). <br /> Perforations Per lateral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check table below to verify the number of perforotions per(atera(guarantees less than o 10%discharge variation. The value is <br /> doub(e if the a center monifold is used. <br /> Maximum Number of Perfaations Fer LaLeraf to Guarantee<1U�e Distharge Yariatiar► <br /> :`i{ncn Fertc�ra:ions 7/32 Incn Perforations <br /> Pipe Diameter tlnchesl Re+iaratio�Spacing Pipe Diameter pnches) <br /> Ferforat��Spacing IFeet) 2 � <br /> t 1�: ti': 2 3 (Feetl ! 4t': it, <br /> z iQ t3 18 30 b0 2 11 16 1t 34 68 <br /> Z�� � 12 tb 2B 54 2'r 10 13 20 32 64 <br /> 3 8 i2 1b 25 51 3 9 14 19 30 64 <br /> 3-'16 inch Perforatic�ns i/8 Inch Perforatians <br /> Fipe Oiame.er(Inchesl Fesforation Spacing Pipe Qiameter finches) <br /> Ferforatro�Spac�ng IFeet) <br /> 1 1�'i 1�< Z 3 i.Feetl I 1YS 1t: 2 3 <br /> 2 12 4$ 2b 46 87 2 2t 33 44 74 149 <br /> t�4 12 17 14 40 8Q 2� 20 30 4f 69 135 <br /> 3 12 16 22 37 75 3 20 t9 38 b4 128 <br /> 7• Total Number of Perforations equals the Number of Perforations per Laterol (Line 6)multiplied by the Number of <br /> Perforated Latera(s (Line 1). <br /> 21 Perf. Per Lateral X �Number of Perf. Laterals = 63 Total Number of Perf. <br /> 8. Calculate the Square Feet per Perforation. Recommended va(ue is 4-10 ft z per perforation. �����n,.����, <br /> PorMracbn Dfameter <br /> Does not apply to At-Grades ��d�«� <br /> ,,, ,,, >,. ,, <br /> Bed Aree = Bed Width (ft)X Bed Length(ft) ,.o• o.,, o.., 0.56 0.�, <br /> 1.S 0.22 0.51 0.69 0.9 <br /> 10 ft x 63 ft = 630 fc2 Z°° °.� °." °.°° ,.°� <br /> 2.5 0.29 0.65 0.89 f.17 <br /> 3.0 0.�2 0.72 0.98 i.28 <br /> Square Foot per Perforation =Bed Area divided by the Totol Number of Perforations (Line 7). 4.0 0.�� o.g3 ,.�3 ,..� <br /> 5.0 p.4f 0.93 1.26 1.65 <br /> Dwellings wi[h S/16 irxA[0//e inch <br /> 630 ft2 � 63 perforations � ��.� ft2/perforations �f�t v��oratiom <br /> Drrellingt wich I/8 vxh pertoratiors <br /> Z(eet OthCf C.[aWiS�ment5 Lnd MSTS wStA 3/16 <br /> 9. Select Minimum Average Head: 1.0 fL inch to v4 irtch perto�atiorrs <br /> 5��` Ocher gtaOlishments and N5T5 with�/8 inch <br /> peAoratb�n <br /> 10. Select Perforation Discharge (GPM)based on Table III: 0.56 GPM per Perforation <br /> 11. Determine required Flow Rate by multiplying the Tota!Number of Perforotions (Line 7)by the Perforation Discharge (Line 10). <br />