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. • pRESSURE DISTRIBUTIOIV SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> 2. Select perforation spacing = �_ft. <br /> 3. Since perforations should not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. E-14), subtract 2 ft. from the <br /> rock layer length. <br /> Rock la— Y� ' 2 ft. _�f t. <br /> 4. Determine the number of spaces between perforations. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. <br /> TABLE OF PERFORATIU[V DISCHARCES IN C('�' <br /> Head Perforatlon diameter(inches) <br /> Length perf. spacing =� ft. i 3 ft. = 2o spaces � 3 �'4 <br /> (3) (2) i.� o.sb o.;a <br /> 1.5 0.69 . <br /> 5. Number of perForations is equal to one plus the number of 2.ob o.so i.oa <br /> 2.5 0.89 1.17 <br /> perforation spaces . a.o 0.98 1.28 <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> �0 spaces + 1 =��perforations/lateral aUse 1.0 foot of head Eor residential systems. <br /> bUse 2.0 feet oE head for other establishments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> � z� �.�.�..�.���.,�,.�..�� . <br /> x � erforations. `"""�°` '"°'� <br /> laeeral s perfs/lateral—�P ��''�' 1 inch 1 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.o i3 i� zb <br /> 3.3 12 16 25 <br /> number of perforations by flow per perforation a.o ii is z3 <br /> (see page E-17) s.o io ia z� <br /> .(�� .� _ <br /> a�s x a�+i� -��gpm. E-15 <br /> r.ras uu+m a oo s r.oR ainMn+es m.u� <br /> �R• <br /> 8. If laterals are connected to header pipe as shown on page E- �; <br /> 15, select minimum required lateral diameter from table on �r..y- <br /> page E-17; enter table with perforation spacing and number ,�''' �'"�'' <br /> of perforarions per lateral. Select minimum diameter for �''� <br /> perforated lateral = z inches. <br /> E-12 <br /> M-:..���M- <br /> 9. If perforated latera� system is attached to manifold pipe near �g"�:__,�,,,..- <br /> the center, a� on page E-12,perforated lateral length and �' -� <br /> number of perforations per lateral will be approximately one "�"�� - <br /> .� <br /> half of that in step 8. Using these values,select minimum _.. . ,,r <br /> diameter Eor perforated lateral from page E-17 as �''` 3� <br /> inches. <br />