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, F-17
<br /> � PUMP SELECTI�N PROCEDIJRE
<br /> � Fl�D PERFORATION OF A PERFORATcD L4TER/1L
<br /> A. Detezmine pump capadty: �...v..,
<br /> Gravify Disfributioa T,,,,,,
<br /> 1. �iinimum suggested is 600 gallons per hour(10 gpm)to stay ahead of _ ,-:-� � . lo� ��N�y�����.
<br /> 'uen►su,A►.w• YcA'bl. �M,..,..o......
<br /> water use rate. �.,,.,,.,;,�,,�,
<br /> 2. 1�iaximum suggested for delivery to a drop box of a home system is 2,700 „ , ►RM°��,au�,�..�„�.��,
<br /> hN UO Nrar Te�
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ••,,:�,w,a .'_u� '�'f`n
<br /> ::�::•. �... . Pv1arTWr le��N al
<br /> Pressure Distibution �.����.v,. ���°�^M�-��^�
<br /> 3.a. Select number of perforated laterals 3 . �
<br /> o�+.:w seN...e.�„scQ,n..
<br /> b. Select perforation spacing= 3 feet ,.,,,.,,,,�,5ai,,�„„
<br /> c Subtract 2 ft from the rock layer length.
<br /> ���-2 ft= '7�; feet
<br /> d. Detemune the number of spaces between perforations.
<br /> Length perf.spacing=�f t.+�ft.= a� spaces Required Perfontion�e
<br /> e. �y spaces+1= a S perforations/lateral ' �+S��P����e�SPm
<br /> f. Multiply perforations per lateral by number of laterals to ��3�"�,� ��se , �� ,
<br /> t total number of orations. � x � S - ��' erforations. H�'a �2 � � �`'�'`
<br /> ��. pa,. �Q,,- P cfeeU
<br /> g' � Xs��=�BP�- .. � � .
<br /> . � 1.Oa 0.56 0.74
<br /> SELECTED PUIVIP CAPACIIY�_gpm f. 2.�b �.8� 1.�4 �
<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 applicadons
<br /> �_feet
<br /> � � 2. If pumping to a pressure distribution rystem,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. Pipe L.engch
<br /> I ;
<br /> Read friction loss in feet per 100 feet from table. poinc of Discharge
<br /> �F.L= a,�! f�/100 ft of pipe ��j
<br /> b. Determine total pipe length hom pump to discharge Elevation Diffeiznce
<br /> point Add 25 percent to pipe length for fitting �P ��
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> length-1.25 times pipe length=
<br /> F-18b
<br /> L D x 1.25= '�_� feet 1.5 inch 2.0 inch 3.0 inch
<br /> c. Calculate total friction loss by multiplying � �;,,;Q,����ft��;�
<br /> friction loss in ft/100 ft by equivalent pipe length.
<br /> Total friction loss= ?.4S x 7�_+100=�_feet 10 0.69 0.20
<br /> 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 friction loss. 16 1.63 0.48
<br /> 18 2.03 0.60
<br /> 20 2.47 0.73 0.11
<br /> ,� + .� + a, 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 ) � feet 45 - 14,73 3.28 0.48
<br /> ' S0 3.99 0.58
<br /> 55 4.76 0.70
<br /> C. Pump selection bo 5.60 o.s2
<br /> 1. A pump must be selected to deliver at least
<br /> � �11 gpm (Step A) with at least � a feet of total head(Step B).
<br />
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