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' PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> 2. Select perforation spacing = ...3 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 /> 0 <br /> Rock layer gth - 2ft. = 48 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. TABLE OF PERFORATION DISCHARGES IN CI <br /> Head Perforation diameter(inches) <br /> Length perf. spacing =15 ft. ÷ 3 ft. = /,spaces 7/32 1/4 <br /> (3) (2) 1.0a 036 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 /> 5.0 1.26 1.65 <br /> /4 spaces + 1 = / 7perforations/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.yE-17b <br /> M_=.uwab maeu ef�urr mce psea.om per Waal to <br /> X -L- = s� erforations. `tO t C5"`." aa <br /> laterals perfs/lateral h p""l y�°"°' 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 /> number of perforations by flow per perforation 4.0 11 15 23 <br /> (see page E -17) , 5.0 10 14 22 <br /> .S/ x .74 _. � m. <br /> pcfs gpm/pert E-15 <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 ��. �, ,.•,'' a- <br /> of perforations per lateral. Select minimum diameter for \------ <br /> perforated lateral = L inches. <br /> E-12 <br /> 9. If perforated lateral system is attached to manifold pipe near c{ ....- <br /> the center,center, as on page E-12, perforated lateral length and <br /> number of perforations per lateral will be approximately one ���'"'- .. <br /> ..l:rL= <br /> half of that in step 8. Using these values, select minimum - . ,�,.. <br /> diameter for perforated lateral from page E-17 as Z.. �,.- "'r <br /> inches. <br />