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PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals C3 <br /> 2. Select perforation spacing = 'T ft. <br /> 3. Since perforations should not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. F.-14),subtract 2 ft. from the <br /> rock layer length. <br /> Rock layer- 2 f t. _�f t. <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. TABLE OF PERFORATION DISCHARGES IN GTIV <br /> Head Perforation diameter(inches) <br /> Length perf. spacing =4B ft. -& ft. (C:�, spaces 132 1!4 <br /> (3) (2) 1.0a 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 O.Su 1.04 <br /> 2.5 089 1.17 <br /> perforation spaces . 3.0 0.98 1.23 <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> j�L 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 /> �Q1�OtoW.M�.��a <br /> a�<�oRAieall'U ad <br /> X =tel erforations. <br /> laterals perfs/lateral l� "',per 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 17 26 <br /> number of perforations by flow per perforation 4.0 11 15 23 <br /> (see page E-17) 5.0 10 14 2: <br /> 8 <br /> perfs x �/F1rf $c m. <br /> F:-15 <br /> -,x <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> 15,select minimum required lateral diameter from table on ;..Y. <br /> page E-17;enter table with perforation spacing and number �,,,.•'°' " <br /> of perforations per lateral. Select minimum diameter for <br /> perforated lateral = 1 'L- inches. <br /> E-12 <br /> 9. Tf perforated latera: system is attached to manifold pipe near <br /> the center, a:; on page E-12,perforated lateral length and A <br /> number of perforations per lateral will be approximately one �'�- <br /> half of that in step 8. Using these values, select minimum „r <br /> diameter for perforated lateral from page E-17 as <br /> inches. <br />