Laserfiche WebLink
PRFSSURE DISTRIBUTIOIV 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 /> R«J�bR�,'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 /> TAB�E OFPERFORATION D(SCHARCES W CP�' <br /> Head Perforatio�diameter(inches) <br /> Length perf. spacing �ft. +� ft. _�spaces � � 4 <br /> (3) (2) i.� o.sb o.;a <br /> 1.5 . 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob o.eo i.oa <br /> 2.5 0.89 1.17 <br /> perforation spaces . 3.0 0.98 1.28 <br /> 4.0 1.13 1.47 <br /> � 1.26 1.6i <br /> ,,�spaces + 1 =�perforations/lateral aU9e 1.0 foot of head for residential systems. <br /> bUse 2A 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 /> � � / WrYY.rl.�sdtrr're�wtatie�rWwlu <br /> X �-� -� erforations. ..�..,.v. °"""`'°`°"�4•"°'"° <br /> laeerat s peds/laceral— p �,� 1 inch 1 inch 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Determine required flow rate by multiplying 3.� 13 1� ?� <br /> number of perforations by flow per perforation a:o ii is i3 <br /> (see page E-17) S.o io ia z� <br /> � S' _� gPm• <br /> �s X �'/�� E-?5 <br /> ��,�.,�d..v.�o.,..�»,,.,.�. <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 �-,�,.Y. <br /> page E-17;enter table with perforation spacing and number ,��'' �u, <br /> of perforations per late� 1. Select minimum diameter for �''� <br /> perforated lateral = I Z inches. <br /> E-12 <br /> r-:....�,::�- <br /> 9. If perforated latera; system is attached to manifold pipe neaz �'"�'�'r__,�,.. <br /> the center, as on page E-12,perforated lateral length and �� � <br /> ,� <br /> number of perforations per lateral will be approximately one "��'�� . � <br /> . <br /> -•.�� <br /> half of that in step 8. Using these values, select minim� _� . ,,,, <br /> diameter for perfurated lateral from page E-17 as � � �''� "— <br /> �� <br /> inches. <br />