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03/09/2010 01:28 7634975011 SPTESTINGINC PAGE 11/13
<br /> PRESSURE DISTRIBUTION SYSTEM Geotexti1e fabric
<br /> nd�si:ixii ., ria.. r
<br /> 1. Select number of perforated laterals 3 _ 2:;•
<br /> 2. Select perforation spacing= 3 ft '' .c.:. o „r04
<br /> I'¢rf Sizin$3/16"-1/4"
<br /> 3. Since perforations should not be placed closer than 1 foot to Perf Spacing 1.5'-5'
<br /> the edge of the rock layer(see diagram),subtract 2 feet from --I
<br /> the rock layer length.
<br /> E-4: Maximum allowable number of 1/4-inch perlorations
<br /> S 5 ���
<br /> - per lateral to guarantee<10%discharge variation
<br /> Rock layer length 2 ft = ..7ft
<br /> perforation
<br /> 4. Determine the number of spaces between perforations. sparing
<br /> Divide the length(3)by perforation spacing(2) and round Meet} 1 inch 1,25 Inch 1.5 Inch I,01nch
<br /> down to nearest whole number. '
<br /> 2.5 8 14 18 z8
<br /> Perforation spacing= S ft 3 ,ft= 1 ') spaces 3,0 8 13 17 26
<br /> 5. Number of perforations is equal to one plus the number of 3'3 12 15 25
<br /> perforation spaces(4). Check figure E-4 to assure the number of' 4'0 7 1 15 23
<br /> perforations per lateral guarantees <10%discharge variation, 5.0 6 10 14 7
<br /> J'7 spaces + 1 = I. ie ,perforations/lateral E.6: Perforation Discharge to gpml
<br /> 6. A. Total number of perforations = perforations per lateral (5) I
<br /> times number of laterals (1) pertora'Ilon dlamet�r
<br /> head Inches)
<br /> f tlglf�"' • (feet) 3/16 7/32 1/4
<br /> le- perfs/lar x, tat= 4 perforations
<br /> 1.00 0.42 0.560.74
<br /> B. Calculate the square footage per perforation. �
<br /> Should be 6-1.0 sgft/perf. Does not apply to at-grades. 2 Ob 0.59 0.80 1,041
<br /> Rock bed area = rock width (ft) x rock length (ft) 5.0 0.94 1.26 1.651
<br /> /0 ft x .<S ft= g„(0 sqft
<br /> a Ube 1,0 foot for single-famliy horns.
<br /> Square foot per perforation =Rock bed area -number of penis (6) a ,loo ralai ror anvihlna el
<br /> _, " sqft y S9' ,perfs= ID,7-- sqft/per[ `
<br /> MnNIroLO isicATEO AT IND or PRESMiRE OSTRMItTIoN I•'•/STEM
<br /> 7. Determine required flow rate by multiplying the total number of
<br /> perforations (G,A,) by flow per perforation(see figure E-6)
<br /> a%-1 perfs x• 1'gpm/perfs i-1 U _ gpm 1 .. '44'-
<br /> 8.
<br /> 4'8. If laterals are connected to header pipe as shown on upper j ;-.
<br /> Lf
<br /> example, to select minimum required lateral diameter;enter .0* 0,,,,,,, • "'"
<br /> figure E-•4 with perforation spacing (2) and ntmlber of perforations \ ''.
<br /> per lateral (5) Select minimum diameter for
<br /> perforated lateral= inches. urnuT nr renronnr�p rn�r r�,nru n,,,,,
<br /> rncsa ma�nigoc
<br /> i
<br /> rckM.TO RAM.v, 1
<br /> 9. If perforated lateral system is attached to manifold pipe near CE
<br /> the center, lower diagram,perforated lateral length (3) and i" Ei "` F 5 W^`"°""r�N 5'� "
<br /> [w
<br /> r r,,,,u
<br /> number of perforations per lateral (5)will be approximately one .,,,.,r,t,^v,,,,.,,,
<br /> half of that in step 8. Using these values,select minimum
<br /> rl
<br /> diameter for perforated lateral = " _inches.
<br /> lice Nr^�,./
<br /> Kin 'v".,
<br /> I hereby certify that I have cgrnpleted this work in accordance with applicable ordinances, rules and laws.
<br /> ``W" (signature) ' Zi.,Li (license#) _2,--, '{__.2..2.1 U (date)
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