Laserfiche WebLink
E-�5 <br /> PRESSURE DISTRIBUTTON SYSTEM <br /> 1. Select number of perforated laterals <br /> 2. Select perforation spacing = 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 /> x�li,�1�,�, -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 DISCHARGES IN CPN� <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = ft. 1 ft. = spaces 132 1 i4 <br /> �3� �2� 1.Oa 056 0.74 <br /> 1S 0.69 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2-ob o.so l.oa <br /> 2S 0.89 1.17 <br /> perforation spaces . 3.0 0.98 128 <br /> 4.0 1.13 1.47 <br /> 5.0 126 1.65 <br /> spaces + 1 = perforations/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other estabiishments <br /> 6. Multiply perforations per lateral by number of laterals to � <br /> get total number of perforations. � E-17b � `y <br /> --� <br /> � � Mc�.u..�l.,ue.d a.,ed..o.e.prW..�r `. <br /> x = p�erforations. `°m"`�°'�`""°"m <br /> lacerals perfs/lateral r ���`�°� 1.25 inch 1S inch 2.0 inch <br /> 2S 14 18 28 <br /> 7. Determine required flow rate by multiplying � 3.0 13 17 25 <br /> number of perforations by flow per perforation a o ii is is <br /> (see page E -17) s.o io ia Za <br /> � X ��� gpm' E-15 <br /> � .,...��.��d.�.��,..�,�,,.,.� <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 � <br /> page E-17; enter table with perforation spacing and number � ,,r <br /> ����� <br /> of perforations per lateral. Select minimum diameter for �'�� <br /> perforated lateral = inches. <br /> E-12 <br /> ,._..,.._..�...�,a.._ <br /> ,.e....�..._.._,_ <br /> 9. If perforated lateral system is attached to manifold pipe near �'w"�"' „ ,e <br /> the center, as on page E-12,perforated lateral length and �``� � '� �`� <br /> number of perforations per lateral will be approximately one ��`�� �'-� <br /> . <br /> -y�xr� <br /> half of that in step 8. Using these values, select minimum __ . ,,,� <br /> diameter for perforated lateral from page E-17 as ��'' "' <br /> � inches. <br />