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. <br /> � T <br /> ' ' PRESSURE DISTRIBUTIOIV SYSTEM <br /> 1. Select number of perforated laterals � : <br /> 2. Select perforation spacing = � ft. <br /> 3. Since perforations should not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. E-14),subtract 2 ft. from the <br /> rock layer length. <br /> �C% S,„.� <br /> Rock layer length - 2 f t. =l� :1 f t. <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 /> TABLE OF PERFORATION DISCHARCES IN GP�' <br /> Head Perforaaon diameter(inches) <br /> Length perf. spacing =��% ft. i�ft. _ ���' spaces �t32 �!a <br /> (3) (2) i.oa o.� o.;a <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob o.so i.oa <br /> perforation spaces . z.s o.s9 i.» <br /> 3.0 0.98 1'16 <br /> 4A L13 1.4i <br /> �f, s.o 1.26 i.bs <br /> 1 ._spaces + 1 = J 7 perforations/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other establighmenrs <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforaHons. E-17b <br /> -? ^� <br /> � � �,./ N�s�Ow�WrmMrM�nrr's�lda�a/�WN� ' <br /> x = -,� erforations. '"""`�°`°""''"°'"' <br /> laterals perfsilacerai p �?'� 125 inch 1 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.o t3 t� ?6 <br /> 3.3 12 16 25 <br /> number of perforations by flow per perforation a.o it is z.3 <br /> (see page E-17) s.o io ia z� <br /> �--, r ' <br /> �� � '7,f ��' <br /> �� <br /> a�s x sa�i� gpm. E-�5 <br /> ���u������� <br /> -� <br /> 8. If laterals are connected to header pipe as shown on page E- � <br /> 15,select minimum required lateral diameter from table on ��...Y- <br /> page E-17;enter table with perforation spacing and number ,�''' ��'' <br /> of perforarions per lateral. Select minimum diameter for t/'� <br /> perforated lateral = .�� inches. <br />' E-12 <br />' �--�,:..�-..���- <br /> �.r._ <br /> 9. If perforated latera: system is attached to manifold pipe near �� ._ __„.�.� <br /> the center, a� on page E-12,perforated lateral length and "`" � � <br /> number oE perforations per lateral will be approximately one "'�"`�� � . ..,.m.,,;� <br /> halE of that in step 8. Using these values, select minimum __ . .,,. <br /> diameter for perforated lateral from page E-17 as •''� `� <br /> inches. <br />