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� � PRESS RE D[STRI�UT�ION 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 /> Rockl��„g�, ' 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 /> TABC.E OFPERFORATION D[SCHARCES IN C('�' <br /> Head Perforation diameter(inches) <br /> Length perf. spacing =4� ft. � 3 ft. _ �spaces ��32 �!4 <br /> �3� �2� t.0a OS6 0.74 <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 /> 2.5 0.89 1.17 <br /> perforation spaces . s.o o.9a �.za <br /> 4.0 1.13 ].47 <br /> I� spaces + 1 = / 7 p 5.0 1.26 1.6� <br /> erforations/lateral aUse 1.0 foot 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 /> '� ►4um Jle.�el�meOu d s��a(a��a�Wad m � <br /> x �- = s� erforations. ""�"�°`��"'°"� <br /> laterals perfs/lacera! p "�Yj°'�°� 1.25 inch 1.5 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. DeterTnine required flow rate by multiplying 3.0 13 i� z� <br /> 3.3 12 16 ZS <br /> number of perforations by flow per perforation a.o tt is z3 <br /> (see page E -17) s.o io ia z� <br /> �/ X ,7 =3S gpm. <br /> �5 sas��� E-�5 <br /> �,�.,�..��..�.�o.'.,.�,�.,.,.�. <br /> -er <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 ,,,.-''' �L'' <br /> of perforations per lateral. Select minimum diameter for `/'� <br /> perforated lateral = � inches. <br /> E-12 <br /> �--�.�...^--�,�:�,�..� <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 of perforations per lateral will be approximately one �''�"`� <br /> . <br /> ...�,.�� <br /> half of that in step 8. Using these values, select minimum _� . ,,,,. <br /> diameter for perforated lateral from page E-17 as �r'''� "- <br /> inches. <br />