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��j�F` :�� <br /> OSTP Non-Levet Pressure Distribution <br /> LINIVERSITY `�-��-f �' <br /> Minnesota Poliution ��'"�°�z <br /> Control A enc Design Worksheet OF MINNESOTA v,�,\�� <br /> 7. Calculate Flow in Gatlons Per Minute for Lateral 1 <br /> A. Select Perforation Spacing: 2.0 feet Perforation Discharge(GPM) <br /> Perforation Diameter <br /> B. Lenqth of Laterats =Length of STA(Line 1)-2 Feet Head(ft) , 3 , , <br /> �8 �t6 �32 �4 <br /> 32 -2 ft= 30 1.0' 0.18 0.41 0.56 0.74 <br /> 1.5 0.22 0.51 0.69 0.9 <br /> �• Number of Perforation Spaces =Divide the Length of Lateral 1 (7.8)by the 2.0° 0.26 0.59 0.80 �.04 <br /> Perforation Spacing(Line 10)and round down to the nearest whole number. 2.5 0.29 0.65 0.89 1.17 <br /> Check Table il to ensure the maximum number of perforations is not exceeded. 3.0 0.32 0.72 0.48 �.28 <br /> 4.0 0.37 0.83 1.13 1.47 <br /> 30 ft/ 2.0 ft= 15 Spaces 5.0 0.41 0.93 1.26 1.65 <br /> a:Use 1.0 for dwellings using 1/4 inch or 3/16 inch <br /> D. Setect Type of Manifold Connection (End or Center): � End ❑ Center hd� <br /> E, Number of Perforations=Num6er of Perforation 5/wces(Line t f)+ 1, b: Use 2.0 for dwetlings using 1/8 inch holes;or,for <br /> oiher establishments using 1/4 inch or 3/16 inch <br /> 15 Spaces+1 = 16 hdes. <br /> F. Flow Rate for Lateral i =Number of Perforations X Flow Rate Per Ho(e for Lateral 1 �' Use 5.0 for other establishmenu using 1/8 inch <br /> perforations and media filters. <br /> 16 X 0.56 = 9.0 GPM for Lateral 1 <br /> 8. Catcutate the Gallons Per Minute Per Foot for Lateral 1. This vatue will then be used to make <br /> sure that the gallons per minute per foot is equivalent in each lateral <br /> Galtons Per Length= Flow Rate for Lateral 1 divided by Length of Lateral 1 <br /> 9.0 .- 30 = 0.30 GPM/Foot <br /> Maximum Number of Perfaratior�s Per Laterat to Guarantez<1Q�;Discharge Variation <br /> %�Inch P orabons 7r32 inch Fecfaratioru <br /> Pipe Diameter linches) Perferation Spacing Pipe D�amrter(lnchesD <br /> Perforation Spacong(Feet) <br /> t 1S4 t:* 2 3 (.feett i tu tt: 2 3 <br /> 2 10 13 18 30 60 2 11 16 21 34 GS <br /> 2t: 8 12 15 1E 54 2U: iQ 14 "t0 32 64 <br /> 3 8 12 16 25 52 3 9 !4 19 30 60 <br /> 3;16 lnch Perioratiorrs t�8 I�ch Perforations <br /> Pipe Diameter(inches) Perforation Specing Pipe Diameter(inchesi <br /> Perfaration Spacmg IFeetl , ���t� � �ua <br /> 1 15�: tt: 2 3 tt: 2 3 <br /> 2 12 1$ 26 �6 67 2 2t 33 44 74 149 <br /> 2i: 12 17 24 40 80 2�: ZO 3Q 4� 6� 135 <br /> � 12 i6 22 37 75 3 20 29 38 6� 128 <br /> 9. Balance flows for other lateral lengths,spacing, and size. <br /> If you end up with targe perforation spacing(3'is max)lower the initial spacing for Lateral 1 (Line 7.A)or the perforation size(Line 6) <br /> Lateral 2 GPM=Length of Lateral X Gattons Per Minute Per Foot(Line 8) <br /> 30 ft X 0.30 GPM/ft= 9.0 GPM <br /> Number of Perforations=GPM/Flow Rate for Lateral 2(line 6.2) Check Table to ensure the maximum number of perforations is not <br /> exceeded. <br /> 9.0 - 1.17 = �8 Perforations Select Type of Manifold Connection(End or Center): <br /> Spacing=(Length of Lateral)/(Number of Perforations-1) � E� � �"� <br /> ( 30 ) _ ( �8 Perforations-1) = 4.5 ft <br />