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� � s <br /> ' PRESSURE DISTRIBUTIOiV SYSTEM <br /> 1. Select number of perforated laterals .3 <br /> 2. Select perforation spacing = 3 ft. <br /> 3. Since perforations siiould 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 /> Rc�k Ia���r�e�R�, - 2 ft. _ �ft. <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 D(SCHARCES f'V Gf'1' <br /> Head Perforadon ciiunete:hnches) <br /> Length perf. spacing =� ft. + � ft. = 2d spaces �i32 �'a <br /> �3� �2� 1.oa o.�6 o.;a <br /> 1.5 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob �.�� t.oa <br /> erforation s aces . 2's °s3 '.'� <br /> P P s.o o.ys �.zs <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> 2o spaces + 1 = 2 perforarions/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 /> � M�Jk.�we,mvw sePvrae�rs0.l.unlw <br /> x � _� erforations. `""""`'°`�''`"'°"m <br /> laeeral s per(s�taceral p '"�j"O°� 1.2 inch 1.5 ine h � 2.0 inc h <br /> 2.5 14 18 28 <br /> 7. Deter:nine required flow rate by multiplying 3.3 12 ib � ?; <br /> number of perforations by flow per perforation a.o ii ts �; <br /> (see page E -17� s.o io ia 2, <br /> � ,�� <br /> perfs X �+rn/;••"f M���it t::. � 1 S <br /> t:• .. <br /> rw1pa�au�so•r oo a�a�t oe+�n�une+r+•�,. <br /> ST• <br /> 8. If laterals are connected to header pipe as shown on page E- � <br /> 15, select minimum required l�teral diameter from table on • ���..,.. <br /> page E-17; enter table with perforation spacing and number �'` ,,,..-�'' ��- � <br /> of perforations per lateral. Seleci rninimum diameter for �''� <br /> perforated lateral = inche�. <br /> E-12 <br /> �--��.;.:,:.�,.�:���- <br /> U. If perforated latPra: sy�stem is attached to manifold pipe near ��w:_,. ,�,.. <br /> the cent�>r, a�; on page E-12, perforated lateral length and -.� <br /> number of perforations per lateral will be approximately one ���'�� <br /> . <br /> ••i'R•L"'^,J. <br /> half oE that in step 8. Using these values, select mini um _r . �,,, <br /> diameter for perforated lateral from page E-17 as� ,��''� "'-" <br /> i nches. � <br />