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r • <br /> c.; • <br /> pRESSURE D[STRIBUTION 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 l ft. to <br /> the edge of the rock layer(see p. E-14),subtract 2 ft. from the <br /> rock layer length. <br /> �o -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. ..„ k,. ,:. . "' - F �,ti,: <br /> ; , , �, .: , . . , <br /> • Head herforadon diaaleter iiith�s) <br /> Length perf. spacing =�ft. + .3 ft. =1�spaces <br /> i.o� o.sb o.;a <br /> (3) (2) �s o.90 <br /> 5. Number of perforations is equal to one plus the number of 2.Sb os9 i.ii <br /> perforation spaces . a.o o.9s i.se <br /> 4.0 1.13 1.4i <br /> �/ p _ /_� p � 1.i6 t.b� <br /> / S aces + 1 — erforations/lateral .ux tA foot of F,ead Eor residmtial systems. <br /> bUse 2A feet of head for other establlshments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> �W�iw�Y�wr�f W jdw��rlr�lr� . <br /> -�— x —L� -�S� erforations. '�"`"` ""� <br /> latenl� peds/lateral P �'�'� inCh 1 u1Ch .Oinch <br /> 2.S 14 18 28 <br /> 7. Determine required flow rate by. multiplying 3 3 i2 ib ?s <br /> number of perforations by flow per perforation a.o it is i3 <br /> (see page E-17) s.o to ia 2a <br /> S/ .Slo <br /> �r, x �,��,.r�-SSPn'• E-?5 <br /> ,W.e,.,.w.�a e.,e...�.�..,.��. <br /> �. <br /> r �,, <br /> , `7!Y <br /> 8. If laterals�are�coruiected�tc�he�der�pipe as showfi�en page'E- ' � �' <br /> 15, select minimum required lateral diameter from table on �,,..Y- <br /> page E-17;enter table with perforaHon spacin��nd�umber , . ,.�''' �"' <br /> of perforations per late al. Select minimum diameter for � t/''� <br /> perforated lateral = �I �Z inches. <br /> ' E-12 <br /> �—^.�.�-z�se•�� <br /> �.,r... <br /> 9. If perforated laterat system is attached to manifold pipe near � ,,..,�,,,..- <br /> tlle center, as on page E-12, perforated lateral length and -� <br /> number oE perforations per lateral will be approximately one ��"""`�� <br /> ••.�� <br /> half oE that in step 8. Using these values,select minirr4um . .._ . �,,,. `_ <br /> diameter for perforated lateral from page.E-17 as �1 �l�- • <br /> inches. <br />