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. �`i !7 <br /> �; � <br /> OSTP Non-Level Pressure Distribution <br /> UNIVERSITY <br /> Minnesota Poliutio� Design Worksheet OF MINNESOTA '` <br /> Controi A enc ����� <br /> 7. Calculate Ftow in Gatlons Per Minute for Lateral 1 <br /> A. Select Perforation Spncing: 2.0 feet <br /> Perforation Discharge(GPM) <br /> Perforation Diameter <br /> B. Length of Laterals =Length of STA(Line 1)-2 Feet Head(ft) ,�e =�,6 '�,: 'ia <br /> 32 -2 ft= 30 �,p" 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 (7.6)by the 2.ob o.26 0.59 o.so �.oa <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 II to ensure the maximum number of perforations is not exceeded. 3.0 0.32 0.72 0.98 1.28 <br /> 4.0 0.37 0.83 1.13 1.47 <br /> 30 fti 2.0 ft= 15 Spaces s.o o.a� 0.93 �.2e 1.65 <br /> D. Select T a: Use 1.0 for dwetlings using 1!4 inch or 3/16 inch <br /> ype of Manifold Connection (End or Center): � End ❑ Center hdes. <br /> E. Number of Perforations=Number of Perforntion Spaces(Line 11)+ 1, b: Use 2.0 for dwellings using 1/8 inch holes;or,for <br /> other establishments using 1/4 inch or 3/16 inch <br /> 15 Spaces+1 = 16 hdes. <br /> F. Flow Rate for Laterai 1 =Number of Perforations X Flow Rate Per Hofe for Lateraf t �' Use 5.0 for other establishments using 1/8 inch <br /> perforations and media filters_ <br /> 16 X 0.56 = 9.0 GPM for Lateral 1 <br /> 8. Calcutate the Galtons Per Minute Per Foot for Laterat 1. This vatue wi(l then be used to make <br /> sure that the gatlons per minute per foot is equivalent in each lateral <br /> Gatlons Per Length= Flow Rate for Lateral 1 divided by Length of Laterat 1 <br /> 9.0 .- 30 = 0.30 GPM/Foot <br /> M.auimum Number o4 Perforatioru Per Lateral to Guaraniee<:10�+b[hscharge Variat�o� <br /> '%.inc Pc4toraha�s 7�`32 1�ch Perfcrations <br /> Pipe Diameter(Inches) Perforation Spacing PiQe D+ameter(inches) <br /> Perfortwn Spacmg fFeet) <br /> 1 iY 1:� 2 3 (FeeYl t f�,5 1�: 2 3 <br /> 2 14 13 18 30 6Q 2 1i 16 21 34 68 <br /> zt� 8 12 16 28 54 2%: 10 14 ZO 32 b4 <br /> 3 8 12 15 25 52 3 9 !4 14 30 60 <br /> 3-'16 lnch Perora:i�ns i!8 inch PerEorat�ns <br /> Re±-feracion Spacing IFeet) �Pe Diameter tinches) Perforation Spacing Pipe Dia.meter(inthes} <br /> t 1Y. ti'; 2 3 tFc-etl t tY.• 1ti. 3 3 <br /> 2 12 18 25 46 87 2 2! 33 4� 74 149 <br /> 21= 12 17 24 � 8Q 2�� 2Q 30 4t 6F 135 <br /> 3 12 16 22 37 75 3 20 29 38 64 128 <br /> 9. Balance ftows for other tateral lengths,spacing,and size. <br /> If you end up with large 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 Laferat X Galtons 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 ma�cimum number of perforations is not <br /> exceeded. <br /> 9.0 .- 1.01 = �9 Perforations Setect Type of Manifotd Connection(End or Center): <br /> Spacing= (Length of Lateral)/(Number of Perforations-1) � E� ❑ Cen�r <br /> ( 30 ) _ ( � Perforations-1) = 3.8 ft <br />