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PRESSURE DISTRIBUTION SYSTEM ' � <br /> 1. Select number of perforated laterals <br /> 2. Select perEoration 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 /> Rak`��ng�, -2 ft. _ ��ft. <br /> �4. Determine the number of spaces between perforaHons. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. <br /> TABLE OF PERFORATION DISCHARCES IN CP�' <br /> Head PerEoration diameter(inches) <br /> Length perf. spacing �� ft. �- 3 ft. _ �spaces �i3z ��a <br /> �3� �2� t.0a 0.56 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 . a.o o.9s ,.�s <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.6i <br /> �spaces + 1 = I 7 perforations/lateral aUse 1.0 foot of head for residential svstems. <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 // - wnae.n..�w..1d.r(� sa�a/a.��r�..l� � <br /> -LL �ar<I0�A�iq�rw�a <br /> laceral s x ��s�i��en,- s perforations. �;•�• 1.25 inch 1.5 inch 2.0 inch <br /> 2S 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.o i3 i� �6 <br /> number of perforations by flow per perforation a.o ii is i3 <br /> (see page E -17) s.o io ia z� <br /> S/ X ,7 =38 m. <br /> �s �,���r gP E-15 <br /> �����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 /> f�Y^ <br /> page E-17; enter table with perforation spacing and number �.- <br /> of perforarions per lateral. Select minimum diameter for ✓"�� <br /> perforated lateral = 2 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 �"",�-_r'� <br /> � <br /> number oE perforations per lateral will be approximately one ""��'� � <br /> ...�:� <br /> half oE that in step 8. Using these values, select minimum __ . ,,,r <br /> diameter for perforated lateral from page E-17 as � �''� "' <br /> inches. �✓ <br />