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� . � � OSTP Pressure Distribution <br /> Mf�nesots Pollution Design Worksheet UNIVERSITY <br /> Contro! enc OF MINNESOTA � �`+�,�- <br /> ProjectlD: v 06.12.13 <br /> 1, Media Bed Width: �0 ft <br /> 2. Minimum Number of Laterals in system/zone = Rouded up number of[(Media Bed Width -4) = 3J + 1. <br /> t �� " 4 � + � _ ��laterals Does nor Qpply ro ar-grades <br /> 3. Designer Selected Number of Laterals: C�taterals <br /> Cannot be less thvn tine 2 (eccent in�c-Qrades) --. <br /> 4. Select Perforation Spocing: 3.0 ft • � ...� �� - <br /> ,. -;s <br /> �i.'�,,,w.w�.�„w«w��.w,.� �•:��r�n„w �--��' <br /> 5. Select Perforation Diameter Size: 7/32 in .-a.... <br /> ...,,...�.,�.�. �.,o..�..,.,.,..,; <br /> b. Length of Latera(s = Media Bed Length - 2 Feet. <br /> 63 • 2ft = 61 ft Perforotion can not be doser then � foot from edge. <br /> � Determine the Number oJ'Perforation Spaces. Divide the length of Laterals by the Perforation Spacinq <br /> and round down to the nearest whole number. <br /> Number of Perforation Speces b1�ft = �3�ft - 20 Spaces <br /> Number of Perforotions per Lcrtera! is equa!to 1.0 plus the Number of Perforation Spaces. Check table <br /> 8. below to verify the number of perforations pe�lateral guarantees less than a 10%discharge va�iation. The <br /> value is double with a center manifold. <br /> Perforations Per Latera! _ ?0 Spaces + 1 = 21 perfs. Per Lateral <br /> M�xiiat�Nunbe�d Pwkr�Eioas ht l�wiln G�w�r�<�(,p�� <br /> �• °r�0"s 1l31 N�c#t Pwfontions <br /> Perfor�tion Sp�ci�{feet) �Di�rretrr IMtiti�s) Perforation Spxiei Pi�e pi�e�ter{I�ks� <br /> 1 1K tvt 1 3 {k'et) t 1Vtr tv! 2 3 <br /> Z f0 f3 1i �0 i0 2 I1 16 21 3� 6a <br /> � d 12 i6 ID ',H 2Vt f0 14 24 32 M <br /> � i 12 1� 2S 61 3 ' f 14 19 3D {,p <br /> 3t16 kKh Perfar�tions 1��� <br /> P+�furation Spicin��Feet? ��K thd�e�s� P�r{o�tioi,SP�nt ��(�es) <br /> t 1K t'� 2 3 IFeet1 1 1�[ 1K 2 3 <br /> 2 12 1i 2i �i i7 3 3i 3� M 7� 1!9 <br /> � 12 i7 2� �0 �0 3� 20 3p 41 69 13S <br /> � 11 1i 22 �1 7""� , 3 � 29 36 i� 12i <br /> 9• Totvl Number of Perforations equals the Number of Perforations per LdteroC multiplied by the Number of <br /> Perforated Laterals. <br /> 21 Pert. Per Lat. X �3 �Number of Perf. Lat. = b3 Totat Number of Perf. <br /> 10. Setect Type of Manijold Connection (End or Center): 0 End ❑ center <br /> 11. Selec[LQteral Diameter (See Table): 2,pp in <br />