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<br /> ,;4Vy�; PUMP SELECTTON PROCEDURE
<br /> F1D PERfORATlON OF A PERfORATE�D LATEia%L
<br /> A. Determine pump capacity: c�v�•-
<br /> Gravity Distribution T,,,,,,
<br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of = :.. - � d�..»R„F,b,k�,,,,,-
<br /> wateruserate. '�'`""'S"°`"` `�� .""�.;""""
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . . -��„a����
<br /> gallons per hour(45 gpm)to prer•ent build-up of pressure in drop box. _.,;,,,„ , -.,�... �z•�e�.
<br /> �a .���..
<br /> . P.,+«m�.�.��,«.,
<br /> Pressure Distibution - � �»��� �"'°""'`"'^'
<br /> 3.a. Select number of perforated laterals 3
<br /> b. Select perforation spacing= 3 feet �w�';,,'`��,""°
<br /> c. Subtract 2 ft from the rock layer length.
<br /> ��-2 ft._ �� l� feet
<br /> d. Deterrrune the number of spaces between perforations.
<br /> L.ength perf.spacing=�ft.+ :. ft.= a� spaces tt�qU;red P�o�eon�t,�xe
<br /> e. �� spaces+ 1 = r� perforations/lateral �,gallons per minute(gpmj
<br /> f. Muitiply perforations per lateral b2 number�of laterals ro ��f��,p, ��`dse �Z m��", { °�d�
<br /> get total number of perforations. �,��� x �„ ,Q,,= lO� pezforations. �f�c>
<br /> g' '� X��+' ^a gPm. � -
<br /> 1.Oa ��6� 0.74
<br /> SELECTED PUMP CAPACITY 3`1 gpm 2.�b �.g� 1.�4
<br /> B.Determine head requirements: a.Use for single family homes
<br /> 1. Elevarion difference between pump and point of discharge. b.Use for all other applications
<br /> �feet
<br /> ��� 2. If pumping to a pressure distribution system,five feet for pressure
<br /> �.-,.,.
<br /> �'` required at manifold if gravity system,zero.
<br /> � feet
<br /> 3. Friction loss
<br /> ' a. Enter friction loss table with g-pm and pipe diameter. � PiP��8�
<br /> Read friction loss in feet per 100 feet from table. r Poinc of Discharg�
<br /> F.L._ �.l� ft./100 ft of pipe T/�3;.
<br /> b. Determine total pipe length from pump to discharge Elc�aaon Diffcrrncel
<br /> point Add 25 percent to pipe length for fitting p�p ����
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> ]ength-1.25 times pipe length=
<br /> �-3 feet F-18b
<br /> IZO x1.25= /�L
<br /> c. Calculate total friction]oss b multi 1 n 1.5 inch 2.0 inch 3.0 inch
<br /> Y P Y� g � �;a;m i�.��oo a or��
<br /> friction loss in ft/100 h by equivalent pipe length.
<br /> 10 0.69 0.20
<br /> Total friction loss= a, l� x J L-�� +100=�_feet 12 0.96 0.28
<br /> 4. Total head required is the sum of elevation difference, 14 1.28 038
<br /> speCial head requirements,and total friction loss. 16 1.63 0.48
<br /> 18 2.03 0.60
<br /> /0 + � + y 20 2.47 0.73 0.11
<br /> 25 3.73 1.11 0.16
<br /> (1) (2) (3c) 30 5.23 1.55 0.23
<br /> 35 7.90 2.06 0.30
<br /> 40 11.07 2.64 0.39
<br /> TOTAL HEAD �feet 45 14.73 3.28 0.48
<br /> 50 3.99 0.58
<br /> C. Pump selection ss 4.76 0.�0
<br /> bo s.bo o.s2
<br /> '� 1. A pump must be selected to deliver at least
<br /> � ��gpm (Step A) with at least �feet of fotal head (Step B).
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