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E-26 <br /> PRESSURE DISTIZIBUTTON SYSTEM <br /> � <br /> 1. Select number of perforated laterals J <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 /> 1..� J <br /> x�,��,.��«,�, -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 /> TABLE OFPERFORATION DISCHARGES IN GPN <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = .:.% ft. _ -�� ft. _ �� spaces 132 1/4 <br /> �3� �2� I.Oa 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.o4 <br /> 2S 0.89 1.17 <br /> perforation spaces . a.o o.9a i.�s <br /> 4.0 1.13 1.47 <br /> ' S.0 1.26 1.65 <br /> � � spaces + 1 = perforations/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other establishments <br /> 6. Nlultiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> - ..� <br /> ✓ / {! �.�..�.���m��.�.�...�� <br /> laeerals X perfs/lateral— � � perforations. ��w� 1.�25 utch �1•5 inch 2.0 inch <br /> 2,� 14 1$_ 28 <br /> 7. Determine required flow rate by multiplying �, i2 �i6 25 <br /> number of perforations by flow per perforation a.o ii is 23 <br /> (see page E -17) • s.o io ia z� <br /> S� .�� � <br /> � X a�i� � �m' E-15 <br /> �,�.,�.��n.�..��.�.,t,��. <br /> � , <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> 15, select minimum required lateral diameter frozn table on �,,_.�- ; <br /> page E-17; enter table with perforation spacing and number ,,,.�''` '�'�'�` ; <br /> of perforations per lateral. Select minimum diameter for �/'� � <br /> perforated lateral = inches. ; <br /> i <br /> E-12 � <br /> i <br /> ���iO1t�l Mi�M� � <br /> 9. If perforated lateral system is attached to manifold pipe near �'���__ ' <br /> " the center, as on page E-12, perforated lateral length and ` � � '�� � <br /> - number of perforations per lateral will be approximately one �'�� � _ y,� � <br /> half of that in step 8. Using these values,select mi um _.. . .,,i t <br /> diameter for perforated lateral from page E-17 as ��_� �,,•�''� �' <br /> inches. I <br />