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PRESSURE DISTRIBUTiON SYSTEM <br /> l. Select number of perforated laterals -� <br /> 2. Select perforatioh spacing = �� ft. <br /> 3. Since perforations should not be placed closer than I ft. to <br /> the edge of the rock layer (see p. E-14), subtract 2 ft. from the <br /> rock layer length. <br /> . ' r' <br /> Rock layer lenqth � 2 Et. _ � ^ 1 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 PERfORATION DISCHARCES IN C f'�' <br /> Head Perforabon diameter(inches) <br /> Length perf. spacing =::�.`.�: ft. � ��� ft. = 1 spaces �i32 �!4 <br /> �3� �2� 1.Oa 0.56 0.;4 <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.zs <br /> 4.0 1.13 ].4i <br /> , 5.0 1.26 1.6i <br /> ` spaces + 1 = � '- perforations/lateral aUse l.0 foot of head for residential svstems. <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 /> ;�. t `.,� , , N..ia,..�,.v W.�cLe w�urr a,,daa�a..W..,,. <br /> x - ,� r:., erforations. `"""'<'°`�„a"`.`.�.'� <br /> la�eral s peds/tacenl- p "rr"�,,,?"+ 1.25 inch 1.5 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Determine required flow rate by multiplying 3•0. 13 1� '-6 <br /> number of perforations by Elow per perforation a.o ii is �3 <br /> (see page E -17) s.o io ia z� <br /> -- f ! <br /> �-,,� � � �; , <br /> _ � <br /> � �r� X �,i��c SPm• E-�5 <br /> �/RD�f4im�T 00 OI n�0l/�OR�N�R+O� 1Ttr <br /> • � �'� <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> @ <br /> 15, select minimum required lateral diameter from table on <br /> � „�. <br /> page E-17; enter table with perforation spacing and number ,��'' �'V- <br /> of perforations per lateral. Select minimum diameter for `/� <br /> perforated,lateral = � � ._. inches. <br /> E-12 <br /> •--�.:........,..�.�. <br /> 9. If perfar�ted laterz; system is attached to manifold pipe near �,��:_�: �� <br /> t11e center, a� on page E-12, perforated lateral length and '�`'�� <br /> �- <br /> num�er of perforations per lateral will be approximately one "�''�;�� _ <br /> - <br /> "s'L7'L� <br /> half oE that in step 8. Using these values, select minimum _� . ,,,_ <br /> diameter for perforated lateral from page E-17 as �,r-� -'- <br /> inches. <br />