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. ' PRESSURE DISTRIBUTI01�1 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 /> 7s� �f <br /> Rock layer lenRth - 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 /> TABC.E OF PERFORATfOlV D[SCHARCES IN CP�' <br /> Head Perforabon diameter(inches) <br /> Length perf. spacing = 7� ft. �- � ft. = Z spaces �i3z i�4 <br /> �3� ��� 1.Oa O.i6 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 /> perforation spaces . 2.s o.s9 �.» <br /> 3.0 0.98 1.28 <br /> 4.0 1.13 1.47 <br /> iJ 5.0 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. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> � � <br /> 2� NWOY��WO4af e�q11Yf OCD p1(Otim1�R IYf�I 4 <br /> x = ��erforations. �.�. �`�""10`Qce�""r'°° <br /> laterals perfs/latenl p ���� 1.25 inch 1.5 inCh 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Determine required flow rate by multiplying 3.o t3 i� z� <br /> number of perforations by flow per perforation a.o ii is �3 <br /> (see page E-17) s.o io ia z� <br /> �s-- ,,� _ ,.�s/� <br /> �5 x �,i��r $Pm• E-15 <br /> ....A,a,��.,�d..��,..,.,,,�,.,.�. <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 ,��'' ��u�' <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 ��w_ ,� <br /> the center, a�-. on page E-12, perforated lateral length and �"`^� ��-+� <br /> number of perforations per lateral will be approximately one "�"`�� � <br /> "►'RL'^� <br /> half of that in step 8. Using these values, select minimum _.. . ,,,,. <br /> diameter for perforated lateral Erom page E-17 as �.�•'` "'- <br /> inches. <br />