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PRESSURE DISTRIBUTIOl�1 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 /> �3 7����,-2 ft. = 3-S ft. <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. TAB OFPERFO N DISCHARCES IN GI'�� <br /> Head Perfor ' eter(inches) <br /> Length perf. spacing =3S ft. + .3 ft. _ /� spaces � � 4 <br /> (3) (2) �.oa o.s o.;a <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 . s.o o.9s i.2s <br /> 4.0 1.13 1.47 <br /> _�;Q 1.26 1.6i <br /> �spaces +1 = /Z perforations/lateral aUse l.0 foot of head for residential systems. <br /> bUse 2.0 Eeet of head for other establfshments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> 3 �z .Wi...W...�..�m...«�rr�►,.d....,.WN� <br /> <I0�wra�p.�er�s <br /> la�erai s X peds/lacenl- � perforations. �;�. 1 inch 1. inch 2.0 inch <br /> 2.5 14 18 2� <br /> 7. Determine required flow rate by multiplying 3.o ts i� ?� <br /> number of perforations by flow per perforation a:o ii is i3 <br /> (see page E-17) s.o io ia z� <br /> .�' <br /> � x �/ � _� gpm• <br /> E-?5 <br /> �4D,.4�..Qe d.�O,K.,.�.,n0,,.,.W <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 /> �,,Y. <br /> page E-17;enter table with perforation spacing and number ,,.��'' ��- <br /> of perforations per lateral. Select minimum diameter for ��''� <br /> perforated lateral = Z inches. <br /> E-12 <br /> ,.,.,.,�.,,,.:��;.,�_ <br /> 9. If perforated laterz; system is attached to manifold pipe near �`_"�':_,..�,� <br /> the center, as on page E-12, perforated lateral length and -� <br /> number of perforations per lateral will be approximately one ��"'r�'�� <br /> ` - -•.•�,�� <br /> half of that in step 8. Using these values,select minimum _.. . ,,,,, <br /> diameter for perforated lateral from pa�e E-17 as ^" �,��'` "-" <br /> i nches. <br />