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PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> 2. Select perforation spacing = 2 ft. <br /> 3. Since perforations should not be placed closer than I 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 - 2 ft. = 4'Oft. <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 /> TAB E OF PERFO' •T ON DISCHARGES IN CPV <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = 60 ft. + 3 ft. = Z°spaces 7/32 1/4 <br /> (3) (2) 1.Oa 0.56 0.74 <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.Ob 0.80 1.04 <br /> 2.5 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 /> 20 spaces + 1 = 2./ perforations/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 /> c.? z/ Mum=.n..+br...r ...Pr.oer.INNto <br /> x = perforations. ra.W..nva 1.25 inch <br /> laterals peels/laceral- mo 125 inch 1.5 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Determine required flow rate by multiplying 3.0 13 1726 <br /> 3.3 12 16 25 <br /> number of perforations by flow per perforation 4.0 11 15 23 <br /> (see page E-17) 5.0 10 14 22 <br /> 63 <br /> perfs x gpm/perf =-s- gpm. <br /> E-15 <br /> ....Call LOCO.1T o.M..o.I a.TI S 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 '''� ...-/- <br /> page E-17; enter table with perforation spacing and number , 4.7r-r-- <br /> of perforations per lateral. Select minimum diameter for \„--'' <br /> perforated lateral = inches. <br /> E-12 <br /> 9. If perforated lateral system is attached to manifold pipe near ���: .�..� <br /> the center, ac on page E-12, perforated lateral length and _ -.4/-- <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 �.i•''� '"� <br /> inches. <br />