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E-26 <br /> PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> • <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 /> Rock layer length <br /> - 2ft. = SP-.) ft. <br /> t <br /> • <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 OF PERFORATION DISCHARGES IN GPM <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = SE,' ft. ± 3 ft. = 19 spaces 7/32 1/4 <br /> (3) - 2) 1.Oa 056 0.74 <br /> l 15 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob 0.80 1.04 <br /> 23 0.89 1.17 <br /> perforation spaces . 3.0 0.98 1.28 <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> 161 spaces + 1 = 20 perforations lateral <br /> 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 -a <br /> 3 Zo 114aaamm.13...+..amis/at gore.ma,•dormarpar lowll It <br /> phrase <br /> `5 inch'Dwaine"� <br /> !i. <br /> laterals x pefs/latezal (Ob P a.terforations. r--r--"..".4125 inch 1.5 inch 2.0 arch <br /> 2.5 14 18 28 <br /> 7. Determine required flow rate by multiplying 3.0 13 17 26 <br /> number of perforations by flow per perforation a 0 12 16 23 <br /> (see page E -17) s.o 10 14 22 <br /> CSD0,7L1 <br /> x _Litt l'( <br /> �f s /> $pm' E-15 <br /> rraa LCC u ao v P .rnr.rt,a.WM.. <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> 15, select minimum required lateral diameter from table on --�- r <br /> page E-17; enter table with perforation spacing and number ..,,� <br /> .r ,- <br /> of perforations per lateral. Select minimum diameter for N\,„--'perforated lateral = Z.() inches. 1'em,,,r,e•4co( <br /> E-12 . <br /> 9. If perforated lateral system is attached to manifold pipe near � ,�� <br /> the center, as on page E-12,perforated lateral length and '�`1-.. - - <br /> number of perforations per lateral will be approximately one <br /> .."'. ._ <br /> , <br /> half of that in step 8. Using these values, select minimum __ . <br /> diameter for perforated lateral from page E-17 as 1.2-6-2_ �� -'-' <br /> inches. <br />