Laserfiche WebLink
PRESSURE DISTItIBUTIOIV SYSTEM <br /> 1. Select number of perforated laterals 3 <br /> 2. Select perEoration 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 /> RakiSoRw - 2ft. =�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. TABLE OFPERFO TIO[V D[SCHARCES IN G!'�� <br /> ,) Head Perforation diameter(inches) <br /> Length perf. spacing = y8 ft. -�- � ft. _ �spaces ��3z ��a <br /> �3� �2� 1.Oa 0.56 0.74 <br /> 1.5 �'b'9-- 0.90 <br /> 5. Number of perforations is equal to one plus the number of 2.ob o.so i.oa <br /> perforation spaces . 2.5 0.89 �.» <br /> 3.0 0.98 1.28 <br /> 4.0 1.13 1.4i <br /> 5.0 1.26 1.6i <br /> �spaces + 1 =�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 /> 3, � MWe-JY.rl.rdvvMtv�ri�eGmeKWwlu � <br /> = S� erforations. ..,.....�. '""""'°`°'�"'".w' <br /> lateral s X peds/lateral p �� 125 inch 1. inCh 2.0 inch <br /> 2.5 14 18 28 <br /> 7. Deter.nine required flow rate by multiplying 3.0 �3 1� ?6 <br /> number of perforations by flow per perforation a:o ii is i3 <br /> (see page E-17) s.o io ia 2a <br /> .�/ .�'�h �� <br /> �rs X �,i�� _'-`.,[_ $Pm� E-15 <br /> �,.�,�.,�d.�..�..,.,.�,,.,,�. <br /> -.r <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 ,s'' ��""�- <br /> of perforarions per lateral. Select minimum diameter for ✓''� <br /> perforated lateral = .� inches. <br /> E-12 <br /> �.:..,--..�::M- <br /> 9. If perforated laterai system is attached to manifold pipe near ��;�'___.�,� <br /> the center, a� on page E-12, perforated lateral length and ""' -•r <br /> number oE perforations per lateral will be approximately one ��`'�� <br /> ' ••.�� <br /> half of that in step 8. Using these values, select minimum _r . ,,,. <br /> diameter for perforated lateral from page E-17 as �,,.�''� "'-" <br /> inches. <br />