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, � F-17
<br /> Pi1MP SELECTION PROCEDURE
<br /> EI�D PERFORATION OF 4 PERFORATED LATERAL
<br /> A Determine pump capacity: �-��
<br /> Gravity Distribution T».«�
<br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of - �. � N�,.,.,,�.F,,,k�,,,,,,.
<br /> water use rate. �`.."►'.,.""w `�'�.,.~�.,.u,..�..
<br /> •Mr►na rrM�w)
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . '�*^��^a'�"°"°'�°°^'•'"
<br /> MI�Ge0 Ii�I TN
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ,�,;,w,�� ,,-�� ��•E•�
<br /> _ ,,._.. . .
<br /> . ..,,..�w�.�.�«.i
<br /> Pressure Distibution �,..,,.,.,,,� M�Nw N{.�t�
<br /> 3.a. Select number of perforated laterals 3
<br /> b. Select perforation spacing=�_feet �".»'���.,;,"'"°
<br /> c. Subtract 2 ft from the rock layer length.
<br /> ��� -2 fL= (,c� feet,
<br /> d. Deternune the number of spaces between perEorations.
<br /> Length perf.spacing=,��ft.+�_f t._ � _spaces Required Periontion Disch e
<br /> e. �,spaces+1 = a _Perforations/lateral u+g�u«,.+P�r�,�ce(gpn�
<br /> f. Multiply perforations per lateral by number of laterals to �1��� ��d e �2�a� i ad�
<br /> get total number of perforations.� x �„ �Q,,=��perforations. ��
<br /> g' �` "�''' ��� 1.Oa 0.56 0.74
<br /> SELECTED PUMP CAPACITY�_$Pm 2.Ob 0.80 1.04
<br /> B.Determine head requirements: a.Use for single family homes
<br /> 1. Elevation 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 /> required at manifold if gravity system,zero.
<br /> �_feet
<br /> 3. Friction loss
<br /> a. Enter friction loss table with gpm and pipe diameter. RP��8�
<br /> Read friction loss in feet per 100 feet from table. � Point of D;scharge
<br /> F.L= �,d it/100 ft of pipe ��
<br /> b. Detersnine total pipe length from pump to discharge Elo�adon Difference
<br /> f r fittin � '�'�
<br /> point Add 25 percent to pipe length o g p„�,p .
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> length•1.25 dmes pipe length= F-18b
<br /> I �O x 1.25=�SO feet
<br /> c. Calculate total friCtion loss by multiplying 1.5 inch 2.0 inch 3.0 inch
<br /> � �.;a;�m��oo n�r P��
<br /> friction loss in h/100 ft by equivalent pipe length. 10 0.69 0.20
<br /> Total friction loss= �-� � x 1S� +100=�_feet 12 0.96 0.28
<br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38
<br /> special head requirements,and total fricdon loss. 16 1.63 o.a8
<br /> I8 2.03 0.60
<br /> 20 2.47 0.73 0.11
<br /> � `� + � + 3 25 3.73 1.11 0.16
<br /> (1) (2) (3c) 30 5.23 1.55 0.23
<br /> 35 7.90 2•06 030
<br /> 40 11.07 2.64 0.39
<br /> TOTAL HEAD a� feet � 45 14.73 3.28 0.48
<br /> 50 3.99 0.58
<br /> 55 4.76 0.70
<br /> C. Pump selection bo s.bo o.s2
<br /> 1. A pump must be selected to deliver at least
<br /> 3�/_gpm (Step A)with at least �.feet of total head (Step B).
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