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' pRESSURE DISTRIBUTIOIV SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> 2. Select perforation spacing = 3 ft. <br /> 3. Since perforations si�oul� not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. F.-14), subtract 2 ft. from the <br /> rock layer length. <br /> Rock la��QnR�, ' 2 f t. _ �f t. <br /> 4. Determine the number of spaces between perforarions. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. Ta,a�E oF�ERFortnT�orv�isc!�tnRCEs��;r,r�.• <br /> Head Perforauon�unetc:hnches) <br /> Length perf. spacing = � ft. - �) ft. = 2o spaces 13z ��a <br /> 1.Oa 056 0.:4 <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob °."" l.a� <br /> 2s o s� �.» <br /> perforation spaces . a.o aya �.:s <br /> a.o 1.i3 t.a� <br /> 2o S dCeS �- 1 = 2� 5.0 1.26 1.65 <br /> p perforarions/lateral aUse 1.0 foot of head For residential systems <br /> bUse 2.0 feet of head tor other establis:;ments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> � Mu�nmJM��4r�eiN sOpMa�.a�irvalis <br /> x � _� erforations. ""°"`�°`�''` �"'°° <br /> laterol s perfs/;aterat p ',��� 1.251neh 1.5 lnth � 2.0 ir;:r <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flo�r: rate by rnultiplying 33 12 i6 � ?� <br /> number of perforations by flow per perforation a.o ii is � z� <br /> (see page E -li; s.o io ia z, <br /> � ,�� <br /> �fs X ���ry„� `��4�'�^I:;. �._,1 1 <br /> n...rau�na�m.r o0 0.�,.nc av+o,,.�o.r,•�. � <br /> - �• I <br /> 8. If laterals are connected to header pipe as shown on page E y i <br /> 15, select minimum required lateral diameter from table on � ��..,. <br /> �age E-17; enter table with perforatinn spacing and number �'" ,,.'�''' ��u- � <br /> of perforarions per lateral. Seleci:ninimum diameter for ��� <br /> perforated lateral = inches. <br /> F-12 <br /> ,--�.�..,---.:�:��- <br /> 9. If perforated latPr�.: ;y�stem is attached to manifold pipe near �`,+,:__.�,� <br /> the cent��r, a�: on page E-12, perforated lateral length and �"" <br /> num��er of ��erforations per lateral will be approximately one ���'� � <br /> .y'wt� <br /> half of that i�� step 8. Using these values,select mini um _.. . � <br /> diameter for �erf��rated lateral from page E-17 as� �� "'— <br /> �''' <br /> i nches. <br />