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� • � PRESSURE DISTRIBUTTON 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 /> �a -2 ft. _ �D 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. TABLE OFPERFORATION DISCHARCES IN G^�� <br /> Head Perforatlon dismeter(inches) <br /> Length perf. spacing = �o4ft. -:- 3 ft. = zE� spaces �isz ��a <br /> �3� �2� 1.Oa 0.56 0.;4 <br /> l.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob o.so t.a� <br /> 2.5 0.89 1.17 <br /> perforation spaces . 3.0 o.9s i.zs <br /> 4A 1.13 1.4i <br /> 5.0 1.26 1.6i <br /> �� spaces + 1 = � perforarions/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 Z / .V.�ma Yle.�sl..,�r 1 aur.�!7eAa�ws,.Ws.l r <br /> x -� erforations. '"""`'°"Die''"'°"°° <br /> latemi s perfs/lateral- P "�YjP"O� 1.25 inch 1.5 inch 2.0 incn <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.o i3 i� zb <br /> number of perforations by flow per perforation a.o ii is �; <br /> (see page E-17) s.o io la z� <br /> C�3 ,7�- _ � <br /> �rs X �,i�� 7 SPm. <br /> E-!5 <br /> �rr�1010�A[�fm q Pe 01 nlmlt O�J�1yNq+fTy <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 �.y_,Y. <br /> page E-17; enter table with perforaHon spacing and number �-�'' ��- <br /> of perforations per lateral. Select minimum diameter for ✓'�� <br /> perforated lateral =_�inches. <br /> E-12 <br /> �---.:..�,_;.e:- <br /> 9. If perforated latera� system is attached to manifold pipe near �,�,_,___.�,.. <br /> the center, as on �age 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 />