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• PI;ESSt> E DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals 3 <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 /> ,.5-5 2 ft. =,5--3 ft. <br /> Rock layer length <br /> I <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 /> • • ' 4:x•:. 1•. •_•!.: • 'S!;aGPT, <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = 33 ft. + .:3 ft. = 17 spaces7/324 <br /> (3) (2) �i o T � <br /> 5. Number of perforations is equal to one plus the number of zob 0.$0 1.04 <br /> 15 0.99 1.17 <br /> perforation spaces . 3.0 0.98 1_28 <br /> 4.0 1.13 1.47 <br /> • <br /> 17 spaces + 1 = l perforations/lateral cii -- 1forlfi t.te <br /> aUse 1.0 toot of head for residential systems <br /> bUse 2.0 feet of head for other establishment- <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number2of/ perforations. E-17b <br /> 1 / w . .+bw� .r� .r..d r <br /> � p <br /> tat oral x p.rf,i►,eenl=.) / Mine <br /> perforations. rj �•�. 1.25 inch �1.3 inch 2.0 ince <br /> 2.5 I <br /> 7. Determine required flow rate by multiplying Cin-) 13 zb <br /> number of perforations by flow per perforation a 0 11 15 23 <br /> (see page E -17) 5.0 10 14 2' <br /> S 675/ <br /> y� <br /> pais x �., = gpm. <br /> E-15 <br /> .......,tv.u ..OF..isw[a.m..nr ....t,. <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 /> k--Y <br /> page E-17; enter table with perforation spacing and number ,,--. <br /> /' . <br /> of perforations per lateral. Select minimum diameter for \,------/ <br /> perforated lateral = .inches. <br /> . E-12 <br /> -_ <br /> 9. If perforated lateral system is attached to manifold pipe near c(_.–..... <br /> the center, as on page E-12, perforated lateral length and °''" <br /> number of perforations per lateral will be approximately one �''��" - <br /> half of that in step 8. Using these values, select minimum '�""� <br /> diameter for perforated lateral from page E-17 as - / X72 �r 42!5 =— <br /> • inches. `�''" .,�(r' <br />