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PRESSURE DISTRIBUTION SYSTEM Geotextile fabric <br /> 1. Select number of perforated laterals 3 carter inch orations s aced GYjj- <br /> ' <br /> 2. Select perforation spacing= feet. 9"of rock <br /> Perf Sizing 7/32" /4 <br /> 3. Since perforations should not be placed closer than 1 ft. to Perf Spacing 15-5 <br /> the edge of the rock layer(see diagram),subtract 2 ft. from <br /> the rock layer length. Perforation Discharges In gpm <br /> G3 -2 ft. _ feet. perforation diameter <br /> �s head inches <br /> (feet) 1/8*13/16 7/32 114 <br /> 4. Determine the number of spaces between perforations. 1.00 0.18 0.42 0.56 0.74 <br /> Divide the length above by perforation spacing and roiuld 2 Ob 0.26 0.59 0.80 1.04 <br /> down to nearest whole number. <br /> 5.0 0.41 0.94 11.26 1.65 <br /> Length perf.spacing= <o/ ft.- 3 ft. = Zo spaces C use 1.0 root for single-fwAytxxnes. <br /> (3) (2) b use 2.0 feet for onythang else. <br /> l \ ' Potentiol for pugging <br /> 5. Number of perforations is equal to one plus.the number of <br /> perforation spaces . <br /> Maximum number of quarter inch perforations pes <br /> Z spaces+ 1 = Z� perforations/lateral lateral to guatnantee<10%discharge variation <br /> Per on <br /> 6. Multiply perforations per lateral by number of laterals to s�feecttjg A <br /> get total number of perforations. 2.5 14 <br /> mew3 x 5 (03 perforations. 13 17 <br /> 3.3 12 16 25 <br /> Calculate the square footage per perforation(6-10 sqft/perf) 4.0 11 15 23 <br /> System area: 10 x 63 = 3 o '114 5.0 10 14 22- <br /> 0 C. _ Ok <br /> area pummm+ _ /o sgft/perf <br /> gWMW LOCATED AT END W M 911RE 08"UNDTM Vol <br /> 7. Determine required flow rate by multiplying <br /> number of perforations by flow per perforation �. <br /> �3 x a7y = 5� gpmWW PwRal <br /> , .. <br /> 8. If laterals are connected to header pipe as shown on upper <br /> example,to select minimum required lateral diameter;enter �t <br /> table with perforation spacing and number of perforations U,,,,,4W <br /> .wawa asrwwrton w ra.o <br /> per lateral. Select minimum diameter fqr <br /> Perforated lateral= 2" inches. <br /> &SC 2." X <br /> 9. If perforated lateral system is attached to manifold pipe near 0 V W rw,%W""a ' <br />`f the center,lower diagram,perforated lateral length and <br /> number of perforations per lateral will be approximately one <br /> half of that in step 8. Using these values,select minimum <br /> diameter for perforated lateral = inches. ��"°" <br />