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PRESSURE DISTRIBUTION SYSTEM (,totextile fabric <br /> 1 Select number of perforated laterals _ 3 <br /> Quarter inch perforations spaced @ 3' 12 <br /> 2. Select perforation spacing = 3 feet. 9"of rock <br /> 3. Since perforations should not be placed closer than 1 ft. to Peri Sizing 7/32"- l/4" <br /> the edge of the rock layer (see diagram), subtract 2 ft. from Perf Spacing 1.5' S' <br /> the rock layer length_ <br /> R 6Yer ,�, - 2 ft. _ 6 I feet. <br /> Required Perforation Dtochar e <br /> 4. Determine the number of spaces between perforations. tit gallons per minute(gpm) <br /> Divide the length above by perforation spacing and round °H` ;– 1 <br /> down to nearest whole number. 'fee" i <br /> 1.0a 0.56 0.74 <br /> Length perf. spacing = 61 ft. -+- 3 ft. = 20 spaces <br /> 2.0b 0.80 1.04 <br /> (3) (2) a.Use for single family homes <br /> b.Use for all other applications <br /> 5. Number of perforations is equal to one plus the number of <br /> perforation spaces . <br /> VD spaces + 1 = ?_ perforations lateral Maximum number of quarter inch perforations per <br /> lateral to guarnantee<10%discharge variation <br /> Perforation <br /> 6. Multiply perforations per lateral by number of laterals to S(f) g 1% 1 z 2 <br /> get total number of perforations. 2.5 14 18 28 <br /> X <br /> lateral s p ���f <br /> _ perforations. 3.0 13 17 26 <br /> 3.3 12 16 25 <br /> 7. Determine required flow rate by multiplying4.0 11 15 23 <br /> number of perforations by flow per perforation 5.0 10 14 22 <br /> 63{� X 11-?q_ - <br /> Y"'-' gpmt 7 gpm. 4Y aro I$ p <br /> LOCATED AT END OF PRESA5TRIOUTiON MlEY <br /> 8. If laterals are connected to header pipe as shown on upper ,', <br /> example, to select minimum required lateral diameter; enter /-- <br /> f <br /> table with perforation spacing and number of perforations / �m d,.�'":� "-- <br /> per lateral. Select minimum diameter for <br /> perforated lateral = a'k inches. <br /> u.wt o1't$ISTCV.we .Uc <br /> 9. If perforated lateral system is attached to manifold pipe near ,-T{~ - ��—.77. ' 1r.' N^ <br /> , , >. 1 __---- <br /> the 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 . - `b <br /> diameter for perforated lateral = \t " inches. >�' ,��°' �` �,, <br />