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• � pRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals <br /> 2. Select perforation spacing = 3 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 /> 3� -2 ft. = 3� ft. <br /> Rock layer length <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. TABCE OF PERFORATI N DISCHARCES tN GP�� <br /> Head Perforation diameter(inches) <br /> Length perf. spacing =�ft. i � ft. = 11 spaces �i3z ��a <br /> �3� �2� 1.Oa 0.56 0.:4 <br /> 1S 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.oe o.so i.oa <br /> 2.5 0.89 1.17 <br /> perforation spaces . a.o 0.98 1.26 <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.6i <br /> (L spaces + 1 =�_perforarions/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other establishmen ts <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> 3 �z .�.,�.�..,.r�...� �.�,�,��v <br /> x = -a�° erforations. `"�'""`"`�`""r" <br /> laterals perfs/lateral p �"'�'P'm� 125 inch 1S inCh 2.0 inch <br /> «..� <br /> zs ia is Zs <br /> 7. Deter:nine required flow rate by multiplying 3.o i3 i� ?6 <br /> 3.3 12 16 25 <br /> number of perforations by flow per perforation a.o ii is �3 <br /> (see page E-17) s.o io ta Zz <br /> � x s'�� = Z 7 gpm. _� <br /> � aa�+ � E _5 <br /> �,.�.,�..�d.,m,�e...,.,�,o,,.�,y <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 �. - <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 /> E-12 <br /> ,-:.,..,�:M- <br /> 9. If perforated lateral system is attached to manifold pipe near ���;,__ ,•� <br /> �L-�s"'- .�,' <br /> the center, as on page E-12,perforated lateral length and -� <br /> number of perforations per lateral will be approximately one ��'��� <br /> ` ••,�� <br /> half of that in step 8. Using these values,select minimum _.. . ,,,,, _ <br /> diameter for perforated lateral from page E-17 as '� � -''' � "~' <br /> inches. <br />