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fRESSURE DISTRIBUTION SYSTEM <br />1. Seiect number of perforated laterals __ 2 __ _ <br />2. Select perforation spacing = :S ft. <br />3. Since perforations 'should not be placed closer than 1 ft. to <br />~he edge of the rock layer (seep. E-14), subtract 2 ft. from the <br />rock layer length. <br />~ <br />Rock layer length • 2 ft. = ~ ft. <br />4. Determine the number of spaces between perforations. <br />Divide the length above by perforation spacing and round <br />down to nearest whole number. <br />Length perf. spacing=~ ft.+~ ft. = _L2_ spaces <br />(3) (2) <br />5. Number of perforations is equal to one plus the number of <br />perforation spaces. <br />. <br />..J..2._ spaces+ 1 = l S:( perforations/lateral <br />6. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />..3_ I 5:i'.' <c...t f . laterals X pens/lateral= ..sL..!,_ per orations. <br />7. Determine required flow rate by multiplying <br />number of perforations by flow per perforation <br />(see page E -17) <br />S 1...1 ..:.1.::::!. _ l <br />pens x gpmtperr --/ D gpm. <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 = ___ inch~s. <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 />half of that in step 8. Using these values, select minimum <br />I J I I diameter for perforated lateral from page E-17 as I 'J__ <br />inches. <br />E ... 26 <br />E-17a <br />TABLE OF PERFORATION DISCHARGES IN GPM <br />Head Perforation diameter (inches) <br />7/32 1/4 <br />1.0a 0.56 0.74 <br />1.5 0.69 0.90 <br />2.0b 0.80 1.04 <br />2.5 0.89 1.17 <br />3.0 0.98 1.28 <br />4.0 1.13 1.47 <br />5.0 ~ 1 .65 <br />a Use 1.0 foot of head for residential systems. <br />bUse 2.0 feet of head for other establlshmenl!I <br />E-17b <br />Mulaa-=~ic===-,.1111111 .. ,... ___ , <br />(f,111) 1.25 inch 1.5 inch 2.0inch <br />2.5 14 18 28 <br />3.0 13 17 26 <br />3.3 12 16 25 <br />4.0 11 15 23 <br />5.0 10 14 22 <br />E-15 <br />IIINlfaL.D LOCATIIJ AT De fl' ......,; CleTMIU'nCIN MTlN <br />E-12 <br />~~= ~'a•