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� OSTP Pressure Distri ution <br /> UNIVERSITY `� <br /> Minnesota Poltution Design Workshee OF MINNESOTA �'`"" � <br /> Control A enc ,,_��- <br /> ProjectlD: v 11.09.22 <br /> 1. Setect Number of Perforated Latera(s in rystem/zone: �� _ __ <br /> (2 feet is minimum and 3 feet is maximum spacing) ",,°,,,,,"" ,,' <br /> Z. Select Perforation Spacing: 3.0 ft ' - - ', :s ' "., � ' _ - <br /> �� <br /> '�ii�r1�, ,v.�<.�•c13':.�w. ii��J'Tof��rir.k T-t1- ' <br /> 3. Select Perjorotion Diameter Size 7/32 in _ _ <br /> C.'��I ro<k <br /> 4. Length of Latera(s =Media Bed Length -2 Feet. �,.�'��.,���,^�;:�^�, , ��',. �<<���,,;��^�.�>.�<���,:7 �„� <br /> 63 - 2ft = 61 ft Perjoration can ot be doser then 1 foot from edge. <br /> 5• Determine the Number of PerJoration Spaces. Divide the length of Late ls (Line 4)by the Perforation Spacing {Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spaces = 61 ft .- 3 ft = 20 Spaces <br /> 6. Number of Perforations per Latera( is equal to 1.0 plus the Number of Pe foration Spaces (Line 5). <br /> Perforations Per Latera! = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check tQble below to verify the number of perforations per latera(guara tees(ess than a 10%discharqe variation. The value is <br /> double if the a center manifold is used. <br /> Maximum Number of Pe�foratior�s Per Latera!to Guar ntee<IPe Q�scharge Yareatian <br /> ,Incn P�*fc�rahons 7/32(ntn Perferatio�s <br /> F1pe tJiarnet�r�inches) Perfo ci�n Spacing Pipz Gtameter({nches) <br /> Perfcrat���Spac°ng IFeetl � 3 <br /> t tY: 1�". 2 3 (Feet! � �tf ��; <br /> � 10 13 16 30 bQ 2 11 16 21 34 68 <br /> �ti: 8 12 �6 26 54 2�: 1Q 14 2G 32 6�f <br /> 3 8 12 ib 25 52 3 9 1� 19 30 bQ <br /> 3:'I b Inch Pertorations 1:8 Intn P?a-ferac�om <br /> Ptipe Diam�ter 4lnches) �erf tion Spaci+� Fipe[�ar�e#er(6nthes) <br /> Fe�c-ra.�:o�Spa��ng{Fe?ti - <br /> f 4�: 1i4 "t 3 (Feet) t tt, iti� � 3 <br /> 2 1Z 18 26 4fi 87 � 2i 33 44 74 149 <br /> t�: 12 17 2� 44 �0 7�: 2� 30 4t 69 13� <br /> 3 t2 1� Z2 37 75 3 20 29 �8 54 1�8 <br /> 7• Total Number of Perforations equats the Number of Perforations per Lat ra( (Line 6)multiplied by the Number of <br /> Perforated Laterats (Line 1). <br /> 21 Perf. Per Lateral X �Number of Perf. aterals = 63 Totat Number of Perf. <br /> 8. Calculate the Square Feet per Perforation. Recommended value is 4-10 f Z per perforation. P�ra,��on�ti..�,��„ <br /> Does not apply to At-Grades ao.toranoa mameter <br /> Noaa�rc) <br /> �/a �/e -/�: �/. <br /> Bed Area = Bed Width (ft)X Bed Length(ft) �.a• o.ie o.s� o.ss o.�4 <br /> 1.5 0.22 0.51 0.69 0.9 <br /> 10 ft x 63 ft = 630 ftZ Z°° °.2` °." °.� ,.°` <br /> 2.5 0.29 0.65 0.89 1.17 <br /> 3.0 0.72 0.72 0.9B 1.28 <br /> Square Foot per Perforation =Bed Area divided by the Total Number of rforations (Line 7). =.o o.» o.e= ,.,3 ,.•� <br /> S.O` 0.41 0.97 1.26 1.65 <br /> 630 ft2 = 63 erforations = z ,��� °"`e�`"'��`h'�,6`,�n`°,�.;rch <br /> p 10.0 ft /perforations oeno.a�m�s <br /> �vrelling,viiN t l8 inch perforatioz <br /> 9. Select Minimum Avera e Head: 1.0 ft 2 f�� a�r establishments and M5T5 wiiA��,b <br /> � �nch to tiA mch peAoratqrts <br /> 4��� O:her r.cablishmrnts and�575 wi[A t/8 inch <br /> peAorations <br /> 10. Select Perforation Discharge (GPM)based on Table III: 0.56 GPM per Perforation <br /> 11• Determine required Flow Rate by multiptying the Tota(Number of Perfor tions �Line 7)by the Perforotion Discharge (Line 10). <br />