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E-a <br /> PRESSURE DISTRIBUTION SYSTEM <br /> 4 <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 /> Ro&layer 1=0-2 ft. = 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 /> IN CPN' <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = ft + ft. = spaces 7/32 1/4 <br /> (3) (2) 1.Oa 0-56' 0.74 <br /> 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 /> 25 0.89 1.17 <br /> perforation spaces . 3.0 098 128 <br /> 4.0 1.13 1.47 <br /> 5.0 126 1.65 <br /> spaces + 1 = 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 /> • iw�rrrr��r �a�*rwwo. <br /> x - erforations. <br /> 125 <br /> .,.... <br /> laterals peefs/lacca!- p e,y 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 a 0 11 15 23 <br /> (see page E-17) 5.0 10 14 22 <br /> rfffs x V-/PCf = gpm. <br /> E-15 <br /> wras u"M a as v wsR an..ma vmm <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 <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 one <br /> yam <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 />