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<br /> PRESSURE DISTRIBUTION SYSTEM Geotextile fabric
<br /> '��;�,���,��°v'$t'OmaRD:�I,Ee��a���s���nco'.�o�i�s�:�u��a''�}"'��'
<br /> 3 .. . � 4,:�t.
<br /> 'b:N.�. �1•. +Rt
<br /> 1. Select number of perforated laterals p��, �,�,�e ��s' .c ;.;��-zw:�:-0;.,:'
<br /> ;�..,��t:;.... . �.:.:ra;:���•- ;. � �:��L.:b��-,;.,.�ti.
<br /> .v)Jw�I?� tl'17 ;� r..�+0 w�'�ir.�'C n:4,�^:Nf,`:e,o¢.,. d:.1�
<br /> v. e.:..e. Ga�'as'n j. q. .a.. ..
<br /> ,,. �. ;{a �`�a�� r:• :o. c••�•�,, r,a,a��:y.,.,�a:r.
<br /> H �,, ;.�C�;.�.�:s�s h• CS• .��•�` ,O; !�'c ':s
<br /> •O fee� n:){�'b.p�R:a�i��.'J..!7�Gk�:��l�a:�i?p..-o,....rRo, t,"t.`,'�"J�r,.•. ?i:e:..G�,t?
<br /> 2. Select perforation spacing= "w'°..�j.`,�,�:' ��; '
<br /> G.�G,C:�;��.`��'apGP�`N���k��u aa' `'��i'3Zt;�r�`�.l�;.7;;;rG•r.��a:�.
<br /> Perf Sizin 7/32"-1/4„
<br /> 3. Since perforations should not be placed closer than 1 ft. to Perf Spac�ng l.s�-s�
<br /> the edge of the rock layer(see diagram),subtract 2 ft. from
<br /> the rock layer length. Pertoratlon Diacharges in gpm
<br /> ? perforat(dn d(ameter
<br /> � aY -2 ft. _ �o feet. heod inches
<br /> ' (feet) 1/8" 3/16 7/32 1/4
<br /> 4. Determine the number of spaces between perforations. �,pa 0.�8 0.42 0.56 .74
<br /> Divide the length above by perforation spacing and round 2 a, 0.26 0.59 0.80 �.04
<br /> down to nearest whole number.
<br /> . 5.0 0.41 0.94 1.26 1.65
<br /> Len erf. s acin = �o f t.+ 3 ft. = a� SPaCeS a u��.o toot for s�np�e-famny homes.
<br /> S� P P g �3� l2� b potentla�or P o g�e�.
<br /> 5. Number of perforations is equal to one plus.the number o f
<br /> perforation spaces . _ , �
<br /> Maximum number of quarter inch perforations pe
<br /> �� spaces + 1 =a1_perforationsllatexal lateral to guamantee<10�o discharge variation
<br /> Perforation
<br /> 6. Multiply perforations per lateral by number of laterals to � S(�feet)g l� l� 2
<br /> get total number of perforations. . 2 5 14 18 28
<br /> .
<br /> 3.0 13 1� 26
<br /> 3 X �- G�_perforations. 3.3 12 16 25
<br /> ter per
<br /> Calculate the square footage per perforation (6-10 sqft/perfl 4.� 11 15 23
<br /> System area: �� x,,.�r�� _ �� 5.� 1� 14 22
<br /> � + �_��sqft/perf
<br /> MAMfDIp LOGTED AT !NO OF PRESSURE MSTRIBUTION SYSTEM
<br /> 7. Determine required flow rate by multiplying: :
<br /> number of perforations by flow per perforation "'�`°
<br /> �.�~
<br /> �1w�o+�A �,
<br /> co 3 X �- �l� gpm ,�,��,�
<br /> �'�' SPm Per . �
<br /> �u^"�
<br /> 8. If laterals are connected to header pipe as shown on upper ��
<br /> example,to select minimum required lateral diameter;enter
<br /> table with perforation spacing and number of perforations ���;,;�,w,�w•�;,,��
<br /> per lateral. Select minimum diameter for ,,,�,�,,,,,K.�
<br /> perforated lateral= � inches. � ' , ,� ��,,,��'"`
<br /> � . �
<br /> 9. If perforated lateral system is attached to manifold pipe near •�,,�,�»�a �
<br /> the center,lower diagram,perforated lateral length and - -��T�rr�,�,�.:,
<br /> number of perforations per lateral will be approximately one �.�, �, ��,�
<br /> half of that in step 8. Using these values,select minimum �,,,�,�'"'" �'^���^
<br /> diameter for perforated lateral= ���_inches. �
<br />
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