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�STP Pressure Distribution <br /> Minnesota Poilution UNIVERSITY �:�� �:. <br /> Design Worksheet � � - <br /> Control Agency OF MINNESOTA ��1\� <br /> ProjectlD: v 06.12.13 <br /> 1. Media Bed Width: �� ft <br /> 2. Minimum Number of Laterats in system/zone = Rouded up number of[(Media Bed Width - 4) : 3] + 1. <br /> ( 10 -4 ) + � = r 3—�laterals Does not apply to ot-grades <br /> �_J <br /> 3. Designer Selected Number of LaterQ(s: �laterats <br /> Cannot be less thQn line 2 (accept in at-Qrades) . <br /> 4. Select Perforatinn Spacing: 3.0 ft - � __ <br /> ,,.,�.................... <br /> ��"`s�--- <br /> 5. Select Perforation Diometer Size: 7/32 in - � <br /> _�,___,o-., <br /> �,,,....�,.,.,..,,�,,, ,,... ,,............. ,,.,..,:,>,.., <br /> 6. Length of Lotera(s =Media Bed Length - 2 Feet. <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge. <br /> � Determine the Number of Perforation Spaces. Divide the Length of L�terals by the Perforation Spacinq <br /> and round down to the nearest whole number. <br /> Number of Perforation Spaces 61 ft - ��ft = 20 Spaces <br /> Number of Perforations per Loteral is equal to 1.0 plus the Number of Perforo[ion Spaces. Check table <br /> 8, below to verify the number of perforations per lateral guarantees less than a 10� discharge variation. The <br /> value is double with a center manifold. <br /> PerforQtions Per Loteral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Kaximum N�rr�ber af Perioratioru Per Lat�al ta Guarantee<10�ti Discharge Variation <br /> ':';Inch P orabo�s 7132 Inch Perforations <br /> Pe,�forataon Spac:ng(Feetl p�Pe Diameter tlr►chez) Perforation Spacing Pipe Diameter iinchesl <br /> 1 1? tti� 2 3 (Feetl 1 1� 1ti: 2 3 <br /> 7 iQ 13 18 30 60 2 11 16 21 34 68 <br /> Z'�� 8 12 16 2� 54 2�: 1d 14 20 32 64 <br /> 3 8 12 16 25 51 3 9 14 19 30 60 <br /> 3'161nch Perforationz t:'S inch Perforations <br /> Pipe Diameter(lnches) Perforation Spacir�g Ftipe�arneter linches} <br /> Pe�forat�on Sparn�iFeetl <br /> t tu 1t; 2 3 (F�,) 1 t� 1ti. 2 3 <br /> 7 �2 18 26 4b 87 1 21 33 44 74 i49 <br /> `'' �2 �7 Zd �(.' $4 2� 20 30 41 69 135 <br /> 3 12 16 12 31 75 3 20 29 38 64 128 <br /> 9• Tota( Number of Perforotions equals the Number of Perforotions per Lotera( multiplied by the Number of <br /> Perforated Laterals. <br /> 21 Perf. Per Lat. X ��Number of Perf. Lat. = 63 Totat Number of Perf. <br /> 10. Select Type of Manifo(d Connection (End or Center): [) End ❑ Center <br /> 11. Se(ect Latera(Diometer(See Tabfe): 2.00 in <br />