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'j_RESSURE DISTRIBUTIOI� SYSTEM <br /> 1. Select number of perforated laterals � _ <br /> 2. Select perforation spacing = � _ ft. <br /> 3. Since perfo:ations si�ould not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. F-14), subtract 2 Et. from the <br /> rock layer length. <br /> __��� - 2 f t. _ � f t. <br /> Ra k laycr lenRth <br /> 4. Determine the number of spaces between perforations. <br /> Divide the length above by perforation spacing and round E-17a <br /> docvn to nearest whole number. <br /> TAB[.EOFPERFORATI(:N D[SC!iARGES iti Gf".' <br /> Head Pcrfor�tion ci�,unNer l;nches) <br /> Length perf. spacing =� ft. = „� ft. = 2vspaces �13z �!a <br /> �3� ��� I.Oa 0.�6 0.�A <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of Z.ob t��� i.oa <br /> 2s o,� i.» <br /> perforation spaces . a.o G.v3 �=s <br /> 4.0 1.13 1.4i <br /> 5.0 1.26 I.65 <br /> �C� spaces + 1 = 2 perforations/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2A feet oE head Eor other establis�ments <br /> 6. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. E-17b <br /> ' , M�u�m J1w�Eis s�aDc e1 urs e peAxr.u�p lunal ie <br /> � x � erforations. `�"'"`"`�'"``""�'°° <br /> lareral s per(s/:ateral —�� ;�r�'�°� 1.25 inch 1.5 incR 2A ir,:r, <br /> 2.5 14 18 2�3 <br /> 7. Deter.nine required flo�f. rate by :nultiplying 3.0 13 t� � ?� <br /> number of perforations by flow- per perforation a.o ii !s � z� <br /> (see page E -17; s.o io ia l z, <br /> Y� X � (�, 7,.�r; .. <br /> per(s �+r;/��--t v�L� hr r s � <br /> WrICID l04'ID�T Oa ry'+[l!/�[PS�1�wR�T^�i� � <br /> � I8. If laterals are connected to header pipe a� shawn on page E- <br /> y i <br /> 15, select minimum requireci lateral diameter from table on _';,..,�• I <br /> page E-17; enter table with perforati��n spacing and number �.��•�''� �����' i <br /> oE perforations per lat�r l. Seleci �ninimum diameter for �,j <br /> perforated l�teral = �inche�. <br /> F.-12 <br /> �--��:.....�,._.a. <br /> ��. If perf�r��ted l��ter� ;y stem is attached to manifold pipe near ��'��,^ <br /> -a:�-r_.. ,�.•-,•- <br /> the cent��r, a�; �n page E-12, perforated lateral length and '�"�� <br /> � <br /> num`�er of ��erforacions per lateral will be approximately one ��'��'�� - <br /> •rcr�tr� <br /> half oE that in step R. Using these values, select minirr� _.. . ,� <br /> diameter for �erE��rated lateral from pa�;e E-17 as� Z .�.�'` "— <br /> � <br /> inches. <br />