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pRESSURE DISTRIBUTIOIV SYST'EM <br /> 1. Select number of perforated laterals 3 <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 /> �� - 2ft. =�ft. <br /> Rock layer IenRth <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 /> TABLE OFPERFORATION DISCHARCES IN Gf'�' <br /> Head Perforatio�diameterlinches) <br /> Length perf. spacing =Q�ft. �� ft. _ �spaces �'4 <br /> �3� �2� 1.Oa 0.56 0.74 <br /> 1.5 . 0.90 <br /> 5. Number of perforations is equal to one plus the number of z.ob o.so i.oa <br /> 2.5 0.89 1.17 <br /> perforation spaces . s.o 0.98 1.28 <br /> 4.0 1.13 1.47 <br /> �spaces + 1 = /� p 5.0 1.26 1.65 <br /> erforations/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 /> � ►4u�Jlw�lY simMt d sb pfa��o�Waal u <br /> x � � erforations. """"`�°`�""'°"m <br /> lateral s perfs/latenl-�p "�r�""°' 1.25 inch 1.5 ineh 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.0 13 i� ?� <br /> 3.3 12 16 25 <br /> number of perforations by flow per perforation a.o it is Z3 <br /> (see page E-17) s.o io ia z� <br /> -�/ ,S' ' <br /> �� X ���� =�Izgpm. E-15 <br /> .�..A,d,�,�..�d.,m.r�,,.,,,e,,.,.,,. <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 /> page E-17;enter table with perforation spacing and number ,��'' ���' <br /> of perforations per later Select minimum diameter for `/'' <br /> perforated lateral = / � inches. <br /> E-12 <br /> �--��.,,..�,._.a <br /> 9. If perforated latera: system is attached to manifold pipe near �'��"� ,.. <br /> the center, as on page E-12, perforated lateral length and �``'�' ~} ~ '� <br /> num�er of perforations per lateral will be approximately one "�'�"`� <br /> . <br /> "i'Ri� <br /> half of that in step S. Using these values, select minir�u _� . __ <br /> diameter for �erforated lateral from page E-17 as i� ,,.,�''�� "r <br /> i nches. � <br />