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� PRESSURE DISTRIBUTIOIV SYST�M <br /> 1. Select number of perforated laterals � <br /> 2. Select perforation spacing = 3 ft. <br /> 3. Since perforati�ns should not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. F.-14), subtract 2 ft. from the <br /> rock layer length. <br /> R�-k�a� - 2 ft. _ �ft. <br /> 4. Determine the number of spaces between perforations. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. <br /> TABLP OF PERfORAT10N DISCHARCES I ti C;i".' <br /> Head Perforacio�ciiunece:hnches) <br /> Length perf. spacing = � ft. + �CPt. _ �Qspaces �i3z �' <br /> �3� ��� 1.Oa 0.56 0.7� <br /> 1.5 0.69 <br /> 5. Number of perforations is equal to one plus the number of z.ob a.�� i.oa <br /> 2.5 0 8� 1.17 <br /> perforation spaces . s.o o.ya i.�a <br /> 4.0 ].13 1.4i <br /> � P �P 5.0 1.26 1.65 <br /> s aces + 1 = � erforadons/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head Eor other establishments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> ZM..,�.�...�d�.a��v�e,�+�..m,��,e.,�, <br /> /� n {yemr<I Ot DueAqa r�ua�m <br /> laterals X perfs/;ateral--�/�rerfnT3t10IiS. ��?"O� 1.25 inch I.5 inch � 2.0 ir.h <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flo��� rate by multiplying 3.0 13 i� � ?� <br /> number of perforations by flow per perforation a.o ii is � >; <br /> (see page E -17; s.o io ia 2, <br /> � X�� �fr; - <br /> perfs ,yr�+r:/��-f � � .1 S <br /> Ww,01D lOf���1 PD O�C1tK LR�r�Vlly��^f,1r ' <br /> � <br /> ��� <br /> 8. If laterals are connected to header pipe as shown on page E- y <br /> 15, select minimum required lateral diameter from table on �- <br /> page E-17; enter table with perfc�ratinn spacing ar.d number � r'�''' ��wr' I <br /> of perforarions per late� 1. Seleci ;ninimum diameter for `,fj-�`'� <br /> perforated lateral = / L inche�. <br /> F,-12 <br /> ,.,..,�,r,,.;;�,�:�a� <br /> 9. If perfor,ited latPra'. sy�stem is attached to manifold pipe near �"��^ <br /> the center, a�; on page E-12, perforated lateral length and '�`� �� r'�� <br /> number of perforations per lateral will be approximately one ���'� <br /> ` <br /> "YAZa^,.� <br /> half of that in step 8. Using these values, select mini�um ..� . ,,,. <br /> diameter for perfurated lateral fr�m pa�e E-17 as� �.,•�� "" <br /> i nches. <br />