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OSTP Pressure Distribution
<br /> UNIVERSITY ..�
<br /> Minnesota Pollution Design Worksheet OF 1�/IINNESOTA
<br /> Control A enc �-�,L�,.-
<br /> ProjectiD: v 11.09.22
<br /> 1. Select Number of Perforated Laterals in rystem/zone: �_J _---- _
<br /> (1 feet is minimum and 3 feet is maximum spocing)
<br /> �,,.,,�.,�„�.,�;,..,.�,,,.
<br /> 2. Select Perforation Spacing: 3.0 ft �> = , _. �' , �,;,,�o�.,; -
<br /> �....,�,.,�,�
<br /> �.�,,,;m,,,,, ' '
<br /> �� t.."pe�lw;it�o�i•.�.�i:�<.r�f':i��.ut t"��"ol�ock t Z'
<br /> 3. Select Perforation Diameter Size 7/32 in _ _
<br /> 6"u(rnck
<br /> 4. Length of Laterals =Media Bed Length -2 Feet. �•,..��:,�,<,,,.. ,<,:�,-�., ,. �>�,f�,.,,;�,,.,>.,�,,,:, , ,,,�
<br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge.
<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 = 61 ft - �ft = 20 Spaces
<br /> 6. Number of Perforations per Lateral is equat to 1.0 plus the Number of Perforotion Spaces (Line 5).
<br /> Perforotions Per Lateral = 20 Spaces + 1 = 21 Perfs. Per Lateral
<br /> Check tab(e below to verify the number of perforations per(otera(guorantees less than a 10q discharge variation. The va[ue is
<br /> double if the a center manifold is used.
<br /> Maximu�n Number of Perfu-atia�s Fer Laterat to G�wrantee<1ff�Dischacge Yariat�on
<br /> ' '�(�.�Fc-rtoratio:�s 7132 I;�ch F'e�farati��s
<br /> Pe�-f�rt+on Spacing(Feetl
<br /> F'ipe Diarr�eter ilnches) Perfaratian Spating Pipe D:ar►eter(tnches}
<br /> S tu< 1ti: 2 3 fFee'ti 1 11�: tt: 2 3
<br /> 7 10 13 18 3Q b0 2 if 16 21 34 68
<br /> '-+: 9 12 16 28 54 2�: i0 14 20 32 6-4
<br /> � P 12 16 25 52 3 9 14 f 9 30 6tl
<br /> ?'16 Inth Per�oratic�ns 1�'8 In�h Perfarat:ans
<br /> Fip?UiaRwt?r(Inchesj Pe.*foration Spacing Pipe D�ameter f.#ncl:esa
<br /> Pe�v�dt-o��pac'ng{F'retl
<br /> i 11. 1�: 2 3 IFeetl i i��: ft: t ?
<br /> 2 12 i8 26 46 87 2 2f 33 4# 74 149
<br /> 2i: 12 17 24 40 8�J 2� 20 3Q 4t b� 135
<br /> � 12 1fi 12 37 75 3 2Q 19 38 64 128
<br /> 7• Tota(Number of Perforations equals the Number of Perforations per Lateral (Line 6)multiplied by the Number of
<br /> Perforated Loterals (Line 1).
<br /> 21 Perf. Per Lateral X �Number of Perf. Laterals = 63 Total Number of Perf.
<br /> --
<br /> 8. Calculate the Square Feet per Perforation. Recommended value is 4-10 ft 2 per perforation. Pa+«��+�o+xti,���o%,�
<br /> Does not app/y to At-Grodes Hcad (� �<<oratbn Diamotcr
<br /> � � ,,, ,,, �,, ,,
<br /> Bed Area = Bed Width(ft)X Bed Length(ft)
<br /> 1.0' 0.18 0.47 0.56 0.7{
<br /> 1.5 0.22 0.57 0.69 0.9
<br /> 10 ft X 63 ft = 630 ftZ Z.°° °.2` °.5' °.� ,.°'
<br /> 2.5 0.29 0.65 0.89 I.17
<br /> 3.0 0.32 0.72 0.98 1_28
<br /> Squore Foot per Perforotion =Bed Area divided by the Total Number of Perforatfons (Line 7). +-o o.» o.e� ,.,3 ,.a�
<br /> 5.0` O.Ii 0,97 1.26 1.65
<br /> Dwelling�wich 1/t6 inch m t/I irch
<br /> 630 ftZ - 63 perforations = 10.� ftZ/perforations �f�� Dt�oratiom
<br /> Dwellings wi[h�/8 inch pertoraeurs
<br /> 2 feet O[her�staCiishments and N.5T5 wiU 3/tb
<br /> 9. Select Minimum Average Head: 1.0 ft ��h�o,�<;���PeKo,a�a�
<br /> 5 f�� Ocher e[abtishme.�t;and N5T5 viieh 1!8 inc�
<br /> pe.fo.a��o�s
<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 Perforations (Line 7)by the Perforation Discharge (Line 10).
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