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. , . <br /> PRESSURE DISTRIBUTION SYSTEM <br /> 1. Select number of perforated laterals � <br /> 2. Select perforation spacing = � ft. <br /> 3. Since perforati�ns si�ould not be placed closer than 1 ft. to <br /> the edge of the rock layer (see p. F-14), subtract 2 ft. from the <br /> rock layer length. <br /> � - 2ft. =� ft. <br /> Rnck laycr IenRth <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(N C;I".' <br /> / ,,, Head Perforacion ciiunetc:hnches) <br /> Length perf. spacing = f0�/ ft. 1� ft. =2d spaces �i32 �!a <br /> �3� 12� 1.Oa 0.56 0.;� <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob �.�� i.oa <br /> erforation s aces . Z.5 �F� '.» <br /> P P s.o o.ys �.zs <br /> 4.0 1.13 1.47 <br /> 2O5.0 1.26 1.65 <br /> spaces + 1 = 2 perforations/lateral aUse 1.Ofoot 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 /> Qdi Z� � 7 Muimr dlw�W s�mlv N mcE pvfairaaa p lua�l a <br /> x =�OJ erforations. `""'"`�°`�""'°"'°° <br /> ►aeerals perEs/laceral p �j""0� 1.25 inch I.5 ineh � 2.0 in:n <br /> 2.5 14 IS 2S <br /> 7. Deter.nine required flow rate by multiplying 3.0 13 t� � zt� <br /> number of perforations by flow per perforation a:o ii is i� <br /> (see page E -17� s.o io ia z, <br /> � �� r _ , <br /> 7 ,, . <br /> perts X �+rc,�.•{ _ h�c 1^,. ' t S <br /> t'.• .„ <br /> .w��ae.�m u ao a.+e�ne ar+�wrw.r+��y <br /> �C!'• <br /> 8. If laterals are connected to header pipe as shown on page E- <br /> ti <br /> 15, select minimum required lateral diameter from table on �,�.�,.�.. <br /> page E-17; enter table with perforarion spacing ar.d number -'''" ,,.•�'' ��w� I <br /> of perforarions per lateral. Seleci rninimum diameter for ��''� <br /> perforated lateral = inches. <br /> F-12 <br /> ,....�,,,,��.�,�:��- <br /> Q. If perforlted latera': sy-stem is attached to manifold pipe near ��""s.,..�,,,r. <br /> the center, a�: on page E-12, perforated lateral length and �"' ' <br /> � <br /> number of perforations per lateral will be approximately one -��'�. <br /> . <br /> -�,'A:4:3 <br /> half oE that in step 8. Using these values, select minim� _� . .,,r <br /> diameter for perforated lateral from page E-17 as �,,..�'� ""- <br /> inches. <br />