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G�LV <br /> . PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals 3 � <br /> 2. Select perforation spaang =�_ft. I <br /> 3. Since perforations should not be placed closer tha 1 ft. to <br /> the edge of the rock layer(see p. E-14), subtract 2 . from the <br /> rock layer length. <br /> �,, ,�, -2 ft. = 3�,ft. � <br /> r� a� <br /> 4. Determine the number of spaces between perfora 'ons. <br /> Divide the length above by perforation spacing a d round E-17a <br /> down to ne�rest whole number. <br /> TA F N <br /> Head Perforatlon diameter(Inche�) <br /> Length perf. spacing = 3�_ft.+ 3 ft. = 1�s aces 7i32 �i4 <br /> (3) (2) l.os o.sb oaa <br /> �s o.� o.�o <br /> 5. Number of perforations is equal to one plus the n mber of 2•°b °.8° �•o� <br /> erforation s aces . 2� °�9 �'�� <br /> p p 3.0 0.96 ].18 <br /> 4.0 1.13 1.47 <br /> r�.0 1.26 1.65 <br /> 13 spaces + 1 = �� perforaHons/la�er aUse 1A foot of hesd for raldentlal system�. <br /> bUse 2.0 feet of he�d(or otha e�tablishmmb <br /> 6. Multiply perforaHons per lateral by number of la erals to <br /> get total number of perforadons. E-17b <br /> � 3 �� M�i��M.rY�.rl�rie�}�l�Ywlr <br /> r�r<IOf ofea�p�Mrf� <br /> �.��,. X �rsi,.��,_�_Perforations. ��.�. i ;��n i � 2. ��n <br /> zs ia is za <br /> 7. Determine required flow rate by multiplyi g 3.o i3 i� 26 <br /> number of perforaHons by flow p�r perforation a:o ii is i3 <br /> (see page E -17) s.o io ia 22 <br /> � x � =31, gpm. , <br /> E-15 <br /> rwios inue�n oe s ris�t�n�na wv+o/ <br /> 'IR' <br /> 8: If laterals are connected to header pipe as shown n page E- �. <br /> 15, select minimum required lateral diameter fro table on <br /> page E-17;enter table with perforation spaang a d number ,,,�''' '�" <br /> of perforations per lateral. Select minimum dia ter for �/''� <br /> perforated lateral = inches. <br /> E-12 <br /> - �--�..r.�r�- <br /> 9. If perforated lateral system is attached to manifol pipe near ��~`j_ ,� <br /> the center, as on page E-12,perforated lateral len th and w <br /> number of perforations per lateral will be approx mately one �"`�� � <br /> half of that in step 8. Using these values, select inimum _.. . ,�. <br /> diameter for perforated lateral from page E-17 as / .�� �� �'''r �� <br /> inches. <br />