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E-26 <br /> PRESSURE DISTRIBUTTON 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 /> S,� <br /> Rock Lyer lmgth '2 f t. = 53 f t. <br /> 4. Determine the number of spaces between perforaHons. <br /> Divide the length above by perforation spacing and round � E-17a <br /> down to nearest whole number. <br /> F PM <br /> Head Perforation dfameter(inches) <br /> Length perf. spacing = _s3 ft. + � ft. _ � '� spaces - �i32 �i4 <br /> (3) (2) �.os o.sb oaa <br /> _ 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob o.so �.oa <br /> perforation spaces . , 2'S a S9 �'» <br /> 3.0 0.98 1.28 <br /> 4A 1.13 1.47 <br /> 5y.0 1.26 1.65 <br /> �spaces + 1 =��perforations/lateral aUse 1.0 foot of head for residenHal�ystems. <br /> bUse 2.0 feet of hed for other e9tablishmenb <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> � � � ���1�r������ <br /> `- p.....<�os Asi.�...ti�r <br /> la�ecal s X �,�rsn.��- 5—�-PerforaHons. �;•�• 1.25 inch 1.5 inch 2.0 mch <br /> 2S 14 18 28 <br /> 7. Determine required flow rate by multiplying 3.o i3 1� 26 <br /> number of perforations by flow per perforation a o ii is i3 <br /> (see page E-17) s.o io ia 22 <br /> S` '��-I <br /> �, x �,�� = 4 o gpm. <br /> E-15 <br /> rwan uu�a ae s rai�t airw�rte�r++o� <br /> � � <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 <br /> page E-17; enter table with perforaHon spacing and number ,,,.�'� �"' <br /> of perforations per lateral. Select minimum diameter for ✓'� <br /> perforated lateral = inches. <br /> E-12 <br /> `^^�.K..�" ��S,::Y'�'� <br /> 9. If perforated lateral system is attached to manifold pipe near ��'"�`,�__,� . , <br /> the center, as on page E-12,perforated lateral length and ��` � <br /> number of perforations per lateral will be approximately one �'��' .,,�,,� <br /> half of that in step 8. Using these values, select minimum .._ . ,,,, <br /> diameter#or perforated lateral from page E-17 as i '�z- ./ ,�"r' <br /> inches. <br />