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� PRESSLIRE DISTRIBUTION SYSTEM <br /> 1. Select nurnber of perforated laterals 3 <br /> 2. Select perforation spacing = 3_ 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 /> Ra��lenqlh � L 1 t. - ! � I t. <br /> 4. Determine the number of spaces between perEorations. <br /> Divide the length above by perforation spacing and round E-17a <br /> down to nearest whole number. <br /> TABLE OF PERFORATfON DISCHARCES IN Gf'�' <br /> Head Perforabon diameter(inches) <br /> Length perf. spacing =� ft. _ � ft. _ �spaces �i32 �'4 <br /> �3� ��� 1.Oa 056 0.74 <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of Z.ob o.so i.oa <br /> 2.5 0.89 1.17 <br /> perforation spaces . 3.0 o.9s i.�g <br /> 4.0 1.13 1.4i <br /> 5.0 1.26 1.65 <br /> �spaces + 1 = 17 perforations/lateral 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 /> �.j �� Wnom�W.al.s1�c d qur�ece pMara Ps Ws�l u � <br /> x = S� erforations. ""�"`�°`°�`°n""r'°° <br /> lateral s perfs/lateral p ���� 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•0 13 i� ?� <br /> number of perforations by flow per perforation a.o ii is i3 <br /> (see page E -17) s.o io ia Z� <br /> �/ ,�� <br /> �5 x ���� = 3S gpm. E-15 <br /> ....A.a,�,�.,�d.,m.�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 �,.Y� <br /> page E-17; enter table with perforation spacing and number ,��'' �u` <br /> of perforations per lateral. Select minimum diameter for `/''� <br /> perforated lateral = �. inches. <br /> E-12 <br /> ,--��...��,�;.�- <br /> 9. If perforated latera; system is attached to manifold pipe near �„�:__,f�. <br /> the center, a�� on page E-12, perforated lateral length and '�"r <br /> � <br /> number of perforations per lateral will be approximately one ���'�� � <br /> "YA•L"^.� <br /> half of that in step $. Using these values, select minimum _� . ,,,. <br /> diameter for perforated lateral from page E-17 as �,��'� `' <br /> inches. <br />