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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 /> Rock la� ' 2 f t. _�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 Pcrforabon diameter(inches) <br /> Length perf. spacing =� ft. = 3 ft. _ /Z spaces �i32 i'4 <br /> (3) (2) t.0a 056 0.;4 <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of z.ob o.so t.oa <br /> 2.5 0.89 1.17 <br /> perforation spaces . a.o o.9s i.�s <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.6� <br /> �spaces + 1 = �� perforations/lateral aUse 1.Ofoot of head for residentia!systems. <br /> bUse 2.0 feet of head for other establishments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> � � 3 ���r��������a <br /> x =�� erforations. �.�. "�°"`�°` �"�'°� <br /> lateral s perfs/laceral p �rr,� 1.25 inch 1.5 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.o i3 i7 ?� <br /> 3.3 12 16 25 <br /> number of perforations by flow per perforation a.o tt ts ?3 <br /> (see page E-17) s.o io ia 2� <br /> S <br /> �X �,i��r =�$Pm• E-?5 <br /> ...�,a.�.�..�d.��.,�,,.,,,,. <br /> -� <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> � <br /> 15, select minimum required lateral diameter from table on �..,.� <br /> page E-17; enter table with perforarion spacing and number ,,,.�°' ��L'' <br /> of perforations per late�r 1. Select minimum diameter for �/'r <br /> perforated lateral = _�__�Z inches. <br /> E-12 <br /> �wn V�f�v�A A uruW w <br /> 9. If perforated later�.: system is attached to manifold pipe near �.,,�,,,,�,:_,.,�,.- <br /> the center, as on page E-12, perforated lateral length and '�"r� �- <br /> numher oE�erforations per lateral will be approximately one ��''��'� <br /> . <br /> "f'RL� <br /> half of that in skep 8. Using these values, select minimum _� . ,,,, <br /> diameter for perforated lateral from page E-17 as �,��''` `- <br /> i nches. <br />