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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 /> Rock layer length <br /> - 2 ft. = 1' 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 /> TABLE OF PERFORATION DISCHARGES IN GPS: <br /> Head Perforation diameter(inches) <br /> Length perf. spacing ='-1,C,.. ft. _ g ft. = /e ? spaces 7/32 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 2.0b 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 /> ;;<' i t? 5.0 1.26 1.65 <br /> /= spaces + 1 = t i 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 /> ,,, • e ►w m®maak moor or �e pe,ro�.�ou ue�l <br /> } <br /> perforations. � .�. "t°` "' `"°° <br /> laterals X perfs/lateral `"" p trrl 1.25 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 /> 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 /> .5_-_-_.1 i 4 .7 <br /> s x BPm/Pert = gpm. E-15 <br /> ta•MOLD LOUIE AT DC CO mOSAK Crini./1 +STD. <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 ,i-"'` w-` <br /> a' <br /> of perforations per lateral. Select minimum diameter for \/„,.. <br /> perforated lateral = Z inches. <br /> E-12 <br /> 9. If perforated lateral system is attached to manifold pipe near cam--t__r ,�,... <br /> the center, as on page E-12, perforated lateral length and 'r` <br /> number of perforations per lateral will be approximately one �'��� <br /> half of that in step 8. Using these values, select minimum ...... . ,4-•diameter for perforated lateral from page E-17 as �,.-''� �"r <br /> inches. <br />