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PRESSURE DISTRIBUTION SYSTEM END PERFORATION OF A PERFORATED LATERAL <br /> , Cava• <br /> • Topsoil <br /> , l <br /> 1. Select number of perforated laterals ---..- .-- • <br /> 'Lane ofel na <br /> ONinln• roblc f' <br /> • Leomy Send Lour not layer p w,wow s. <br /> • . • with •• resin pope') <br /> 2. Select perforation spacing = 0 feet ,miry ctrtratl• mi Per tor•lion Wiled Ilerisonl•..., <br /> ..' <br /> Into C•p Near Top <br /> /�Plus �,-Al Lies' f2e Is Edge <br /> 3. Since perforations should not be placed closer than 1 ft. to leld Roc ` • , of Rock Loper <br /> oaned al <br /> the edge of the rock layer (see diagram), subtract 2 ft. from dean sand Loper -Bottorolof tferal <br /> Bottom a/.LLtool <br /> the rock layer length. <br /> �C - -Zorlylnal Soil Properly ScorllNd <br /> JBefore Placing Bond •Lays, <br /> Rock layer length - 2 ft. =3: feet <br /> TABLE OF PERFORATION DISCHARGES IN GPM <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. '/. '/• <br /> C 1.9a 0.56 (c`Q <br /> ft. 3 ft. = 17 1.5 0.69 0.90 <br /> Length perf. spacing = spaces 2.0b 0.80 1.04 <br /> (#3) (#2) 2.5 0.89 1.17 <br /> 3.0 0.98 1.28 <br /> 5. Number of perforations is equal to one plus the number of <br /> 4.0 1.13 1.47 <br /> perforation spaces . 5.0 1.26 1.65 <br /> aUse 1.0 foot of head for residential systems. <br /> 12 spaces + 1 = 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 /> 3 I STable 2 <br /> X =Sperforations Maximum allowable number of quater inch perforations per <br /> laterals perfs/lateral lateral to guarantee<10%Discharge variation <br /> pC{Ofet1nn'4e`l14 1.25 inch 1.5 inch 2.0 inch <br /> (r moi) <br /> 7. Determine required flow rate by multiplying 14 18 28 <br /> number of perforations by flow per perforation 13 ��1Z_, 26 <br /> 3.3 12 16 25 <br /> / 4.0 11 15 23 <br /> 0-`7' 0,747 il 5.0 10 14 22 <br /> pens x gpm/pert 7U gpm. <br /> • <br /> 8. If laterals are connected to header pipe as shown on upper µ,,aa "ie" " " '"`�"K. <br /> "'"" oo"'" " <br /> example, select minimum required lateral diameter from . <br /> table 2; enter table with perforation spacing and number _•_ --�-�� <br /> of perforations per lateral. Select minimum diameter for �,---��r • <br /> perforated lateral = inches ,�,,,,-aro <br /> 9. If perforated lateral system is attached to manifold pipe near <br /> the center, as in lower example, perforated lateral length and lwr:�:•r:eM <br /> number of perforations per lateral will be approximately one """'"""" <br /> half of that in # 6. Using these values, select minimum '� ' <br /> diameter for perforated lateral from table 2 --�` -x•:- -- <br /> perforated lateral = . l /7, inches `.r---f"� • ' 7r <br /> .r - <br /> ,,r <br /> . rtN---- <br />