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� � pRESSURE DISTRIBUTI01�1 SYSTEM <br /> 1. Select number of perforated laterals -5 <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 /> .,a 7 , _� <br /> Rock layer length - 2 f t. -�S 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 PERFORATfON DISCHARCES(N GI'�' <br /> ..� Head Perforabon diameter(inches) <br /> Length perf. spacing = �-� ft. � -� ft. = 1� spaces ��32 �'4 <br /> �3� �2� I.Oa 0.�6 0.74 <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob o.so i.oa <br /> perforation spaces . 2.5 0.89 �.�� <br /> 3.0 0.98 1 Z8 <br /> 4.0 1.13 1.47 <br /> � � s aces + 1 = � Z erforarions/lateral 5.o i.26 l.b' <br /> P �7 aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other establishments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> � 1 Z .�.��.�.d�.�, �,��m,.�a <br /> x = �6 erforations. `"�'m<�°"�''"'°'"m <br /> lacerat s perfs/laceral p "�m�°'�°� 1.25 inch 1.5 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.o i3 t� ?� <br /> number of perforations by flow per perforation a.o ii is �3 <br /> (see page E -17) s.o io ta z� <br /> �_ � _ �� m. <br /> �s x �,i��r $P � <br /> E-_5 <br /> �uw�OlO lOfJim�T OO 0!,wLaK PSf1iFRq+STTry <br /> �� <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> � <br /> 15, select minimum required lateral diameter from ta�le on <br /> � ..�.. <br /> page E-17; enter table with perforation spacing and number ,��"' ���- <br /> of perforations per lateral. Select minimum diameter for �/'� <br /> perforated lateral = Z inches. <br /> E-12 <br /> �--�,.:.,...�,._.,... <br /> 9. If perforated latera� system is attached to manifold pipe near ���",�'__ r. <br /> �a�:i= .e'" <br /> the center, as on page E-12, perforated lateral length and �- <br /> number of perforations per lateral will be approximately one "�''��'� <br /> � <br /> ...�QL� <br /> half of that in step 8. Using these values, select minimum _� . ,,. <br /> diameter for perforated lateral from page E-17 as �'' �.��''� "'r <br /> inches. <br />