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• PRESSURE DISTRIBUTION SYSTEM END PERFORATION OF A PERFORATED LATERAL <br /> 0.11 nr. <br /> • <br /> 1. Select number of perforated laterals 3 ..r'""" <br /> • <br /> ,�,er ee5IOlM ✓" <br /> 1m o aoal 111.►• 1.Deli telerNgy Pi sI <br /> 2. Select perforation spacing = 3 feet �,�-r,r-„ .-,well ..►t«'tw,as N.,wak;.-.." <br /> t tip. D•is No <br /> 3. Since perforations should not be placed closer,than 1 ft. to °'�"" ' : . ' 'lsrmIsse <br /> '' `/"' <br /> the edge of the rock layer (see diagram), subtract 2 ft. from Clem s.ae Lover &Pwmonk of •` OW sl <br /> the rock layer length. -�� ;, ,. <br /> s°ra«:t►«tio Sane .r" <br /> Rock layer length'2 ft. = 5 3 feet <br /> TABLE OP PERT-ORATION DISCHARC115 IN CPM <br /> 4. Determine the number of spaces between perforations. Head Perforation diameter(inches) <br /> Divide the length above by perforation spacing and round <br /> down to nearest whole number. '4, 14 <br /> 1.0a 0.56 0.74 <br /> Length perf. spacing = s 3 ft.+ ft. = i-' spaces i ob 0.6890 1.0. <br /> (#3) (#2) 2.5 0.89 1.17 <br /> 5. Number of perforations is equal to one plus the number of 34.00 0.13 1 <br /> .47 <br /> perforation spaces . 5.0 1.26 1.65 <br /> aUse 1.0 foot of head for residential systems. <br /> 1 spaces + 1 = I perforations per lateral 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. <br /> i/y a Table 2 <br /> _.Z_ x t Y. S4 perforations `�aaintwn allowable lwnber of ouster loch perfonttesa pot " <br /> Metal$ perfs/lateral= P lateral to awrantas.d•%Melons eariotloa <br /> Petfarlietral 1.25 inch 1.5 inch 2.0 inch <br /> 7. Determine required flow rate by multiplying 2.5 14 18 28 <br /> number of perforations by flow per perforation 3.0 13 17 26 <br /> 3.3 12 16 25 <br /> • 4.0 11 15 23 <br /> 5.0 10 14 22 <br /> per star x gpm/pperr=-' 8Pm. <br /> 8. If laterals are connected to header pipe as shown on upper mamas"uno IT""""`""`4""""'""' <br /> example,select minimum required lateral diameter from .,,r • <br /> table 2;enter table with perforation spacing and number <br /> of perforations per lateral. Select minimum diameter for <br /> perforated lateral = inches o'''. 1- <br /> • <br /> 9. If perforated lateral system is attached to manifold pipe near <br /> the center,as in lower example, perforated lateral length and .=.3Vs- <br /> number of perforations per lateral will be approximately one if"""""`"" <br /> half of that in #6. Using these values, select minimum : -4.._r,,,,,0''" <br /> diameter for perforated lateral from table 2 .. .a....• <br /> perforated lateral = / /la.. inches •+*+ <br />