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E-26 <br /> PRESSURE DISTRIBUTION 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 /> ,37 <br /> Rocklayerlwo <br /> -2ft. = 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. <br /> OF PERFORATION DISCHARGES IN CPN' <br /> Head Perforation diameter(inches) <br /> Length perf. spacing =-,�Yft.13 ft. _ spaces 7/32 1/4 <br /> (3) (2) 1.0a 0S6 0.74 <br /> iS 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2-Ob 0.80 1.04 <br /> perforation spaces . 3 0 0 98 1as <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> spaces + 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 /> 1 Mlmodlwii��d dpdses p�Yrtlm <br /> xp— O erforations. <br /> laterals peefs/lateral— a,y 125 inch 1 itch 2.0 inch <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 11 is 23 <br /> (see page E-17) 5.0 10 14 22 <br /> Perla x &P-Offf = SPm• E-15 <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> 13, select minimum required lateral diameter from table on <br /> page E-17;enter table with perforation spacing and number <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, as on page E-12,perforated lateral length and <br /> number of perforations per lateral will be approximately onea`A- <br /> half of that in step 8. Using these values,select minimum <br /> diameter for perforated lateral from page E-17 as <br /> inches. <br />