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PRESSURE DISTRIBUTION SYSTEM - Trenches <br /> �,��� <br /> � Eft1N1 <br /> s <br /> • All boxed rectangles must be enteretf,the rest will be ca/culafed. <br /> r�s�rgsiis- ii.- <br /> r�e sp.���.s•-s. <br /> 1. Select number of perforated laterals: 0 <br /> 2. Select perforation spacing= �ft Et �r�.,r+dowm•rur�e.►a�i+-r,�e,v«+a�o�• <br /> a.wad a a+�+»aos a.�n�.vabon <br /> 3. Since perforations should not be placed closer that 1.0 foot to � <br /> the edge of the rock layer(see diagram),subtract 2 feet from <br /> the rock la er len th 2s a �a ia an <br /> 75 -2 ft= 73 ft ao a is n 2a <br /> rock layer length to � ii �s zs <br /> 5.0 6 10 14 22 <br /> 4 Determine the number of spaces between perforations. <br /> Divide the length(3)by perforation spacing (2)and round down to nearest whole number. <br /> Perforation spacing= 73 ft/ 3 ft= 24 spaces <br /> 5. Number of perforations is equal to one plus the number of perforation spaces(4). <br /> `Check figure E-4 to assure the number of perforations per lateral guarantees <br /> < 10%discharge variation. <br /> 24 spaces+1 = 25 perforations/lateral <br /> 6. A.Total number of pertorations=perforations per lateral(5)times number of laterals(1). <br /> 25 perfs/lat x 3 laterals= 75 perforations <br /> E b: Poria+do�Gbchape In�rn <br /> B. Calculate the square footage per pertoration. <br /> perforaflon c9ameter <br /> Should be 6-10 sqfUperf. Does not apply to at-grades. i�� <br /> 1. Rock bed area=rock width (ft)x rock length(ft) �t�j / 3�16 7�s2 1!4 <br /> 10 ft x 75 ft= 750 ft� 1.0� O.7 s 0.42 0.56 0.74 <br /> 2. Square foot per perforation =Rock Bed Area/number of perfs (6) <br /> 750.0 ft� / 75 perfs = 10.0 ft�/perf 2•ob o.26 0.59 0.80 t.o4 <br /> 5.0 o.ai 0.94 �.�a i.� <br /> 7. Determine required flow rate by multiplying the total number a uio t.orootr«�npio�amiynorroc <br /> of perforations(6A)by flow per erforations(see figure E-6) b u.��.or�rro�o + e�. <br /> 75 perfs x 0.56 gpm/perfs= 42 gpm <br /> 8. If laterals are connected to header pipe as shown "�"' '°°"�,,,,,a,,,p,,,,p <br /> in Figure E-1,to select minimum required lateral <br /> diameter; enter figure E-4 with perForation spacing(2)and "'°m' <br /> . <br /> ._ <br /> number of perforations per lateral(5). ��:'°� <br /> R¢��E 1:Mmbtl laod�d al Erd W M�n <br /> Select minimum diameter for perforated laterals= 02 inches <br /> 9. If perfo�ated lateral system is attached to man'rfold pipe n,�c�z:M�.w��a '"°°� <br /> ki CMIw d ew M�+ <br /> near the center, like Figure E-2, perforated lateral length(3) <br /> aacp. <br /> and number of perforations per lateral (5)will be approximately <br /> one half of that in step 8. Using these values, select <br /> -d�� <br /> minimum diameter for perforated lateral= NA inches. <br /> �..�� <br /> I hereby certify that I have completed this work in accordance with all applicable ordinances, rules and laws. <br /> (signature) ��Z� (license#) G���— (date) <br />