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07/09/2e08 10:37 952-955-5071 BURNS EXCAVATING PAGE 12 <br /> PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals � � <br /> 2. Select per�oration spacing 3.0 <br /> 3. Since perforations should not be placed closer than 1 �t to the edge of the rock layer, <br /> subtract 2 fieet from the rock layer length. <br /> 75 minus 2 feet = 73 feet <br /> 4. Determine the number of spaces between pertorations. Divide the length above <br /> by the pertoration spacing and round down fio the nearest whole number. <br /> 73.0 divided 3.0 equals 2A�.3 spaces rounded down = 24 <br /> 5, Number of perforations is equal ta 1 plus the number of perforated spaces in step 4. <br /> 24 spaces plus 1 = 25 pertorations per lateral <br /> 6_ Multiply the pertorations per lateral by the number of laterals <br /> to get total number of pertorations. <br /> 25 X 3 equals 75 total number of perForations <br /> 7. Determine the required flow rate by multiplying the number of <br /> pertorations by the required perforations discharge from the table below. <br /> 75 perforations X 0.56 hole discharge = 42 gpm <br /> MAXIMUM NUMBER OF QUARTER fNCH P�RFORATIONS PER REQUIRED PERFORATION DISCHARGE <br /> LATERAL TO GUARANTEE<10°k OISCHARGE VARIATION IN GALLONS PER MINUTE GPM <br /> PERF SPACING IN FEET 1.25 fN PIPE 1.5 IN PIPE 2,0 IN PIPE OISC.HFAD 7/32 IN PERF 1/�}IN PERF <br /> 2.5 14 16 28 1.0 a D.56 0.74 <br /> 3,0 13 17 26 2.0 b O.B 1.04 <br /> 3.3 12 16 25 a. USEO FOR SINGLE FAMILY HOMES <br /> 4.0 11 15 23 b_ USED FOR ALL OTHER APPIICATION <br /> �,0 10 14 22 <br /> 8. If HEADER P(PE is connected to the END of the laterals, select minimum required lateral <br /> diameter from table above with perForation spacing and number of perForations per <br /> lateral. Select minimum diameter for the perforated lateral. <br /> You have selected ft spacing and perfs per lateral <br /> 2_00 inch minimum diameter laterals <br /> 9. If HEADER PIPE is connected to th� C�NTER ofi the laterals, perts per lateral are 1/2, <br /> select minimum required lateral diameter from table above with pertoration spacing and <br /> number af pertorations per lateral. Select minimum diameter for the pertorated lateral, <br /> You have selected 3.0 ft spacing and 25.0 perts per lateral <br /> 2.00 inch minimum diameter late►'al <br /> PAG� 7 OF 12 <br />