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, PRESSURE DISTRIBUTIOI�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 /> 5�� , <br /> Rock layer length - 2 f t. —�=f t. <br /> 4. Determine the number of spaces between perforarions. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. TAB�E oF�ExForinn�rtorv DtscxnRces w cr��� <br /> Head Perforabon diameter(inches) <br /> Length perf. spacing =��� ft. �� ft. _ �spaces �i3z t�.�.-. <br /> �3� �2� 1.Oa 056 ,4 <br /> 1.5 0.69 <br /> 5. Number of perforations is equal to one plus the number of z.ob o.so t.oa <br /> perforation spaces . 2.5 o.s9 �.» <br /> 3.0 0.98 1.28 <br /> 4.0 1.13 1.4i <br /> 5.0 1.26 1.65 <br /> �spaces + 1 = /7 perforations/lateral aUse I.O 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 /> � ►W��J1w�Y si�r N oc!p(o��o yr Ws�l u � <br /> x � - �� erforations. `"'�"`�°`�'`"'°"' <br /> lateral s perfs/laceral— 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 t� ?t� <br /> number of perforations by Row per perforation a o ii is �3 <br /> (see page E -17) s.o io ia 2� <br /> .�/ x � �.�,� gpm <br /> �5 s���� E-15 <br /> �,�.�.,�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 �;.7� <br /> page E-17; enter table with perforation spacing and number ,,,.-�'' �'�- <br /> of perforarions per lateral. Select minimum diameter for �/'' <br /> perforated lateral = Z 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�erforations per lateral will be approximately one ��"`� - <br /> ^YA•L"� <br /> half of that in step $. Using these values, select minimum _.. . .,,, <br /> diameter for perforated lateral from page E-17 as �.r-''� "'— <br /> inches. <br />