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<br /> F-17
<br /> .',�
<br /> F PUMP SELECTION PROCEDURE
<br /> EIO FERFOR4TION OF • PfRFORaiED L�7ERa�
<br /> A. Determine pump capadty: �._.�...,
<br /> Gravity Distribution ,,,,,,,
<br /> 1. Minimum sugge�sted is 600 gallons per hour(l0 gpm) to stay ahead of - ,:. ' «���w���� �
<br /> wateruserate. �'"''s""""" ��""".'"^. �'"^"'
<br /> �. �,'
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ., , ����d��� �����•���
<br /> ��� � t�
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. , .,;„�, _., �,,,, ,:•,. .,,.
<br /> I� •f Rx�1q.�
<br /> . IrtirnMrv lo�i�M s�
<br /> Pressure Distibution ��..�s.�.�.,,. M,�-^« �..^.
<br /> 3.a. Select number of perforated laterals 3
<br /> on�...'s.0 rr.w.r s�,i�..
<br /> b. Select perforation spacing=�_feet ,,,�.,�,,,,�,,,�,,,,
<br /> c. Subtraft 2 ft from the rock layer length.
<br /> ��-2 fG=��feet
<br /> d. Det r�rrune the number oE spaces bet�veen perforaHons.
<br /> I„ength �.SFaciIlg=S ft.y-�_ft._�_spaces Requirad Perfoncon Diuh�Be
<br /> e. j�spaces+ 1 =�perforations/latesal �n gzllons per a,ir,u�e(gpm)
<br /> f. Muldply perforatiorLs per lateral by number of laterals to DH�d e ��.,P,, i Pa�
<br /> get tocal number of perforadons.�; x �� ��_�_perforations. �f��
<br /> g. � X�p„r=�SP m.
<br /> 1.Oa 0.56 0.74
<br /> SELECT'ED PUMP CAPACITY �-�D _gpm 2.0�j 0.8Q 1.04
<br /> B. Detezmine hea.d requirements: a. Use for single family homes
<br /> 1. Elevadon difference between pump and point of discharge. b. Use for all other applications
<br /> _�feet
<br /> � 2. If pumping to a pressure distribueon rystem,five feet for pressure
<br /> required at manifold if gravity s stem,zero.
<br /> S� feet
<br /> 3. Fricdon loss
<br /> a. Enter friction loss table with gpm and pipe diameter. Pipe[-«�g�h
<br /> �_
<br /> Read friction loss in feet per 100 feet from table. � Poini of Discha
<br /> F.i_ _�l�`�ft./100 ft of pipe �u
<br /> b. Deternvne total pipe length from pump to discharge Elcvation Diftertncc
<br /> pointi Add 25 percent to pipe length for fitting p�p _�,�,
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> length-1.25 dmes pipe length=
<br /> �x 1.25 =��feet F-18b
<br /> c. Calculate total friction loss by multiplying 1.S��c�b 2.o inch 3.0 v,�n
<br /> friction loss in h/100 h by equivalent pipe length. �`�' �e10°n�v�v�
<br /> Totai fricdon loss= a-L4 x G3 +100= Z- 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 fricdon loss. 16 1.63 0.48
<br /> I8 2.03 0.60
<br /> 20 2.47 0.73 0.11
<br /> S + S� + Z- 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 /> TOTAL NEAD 40 11.07 2.64 0.39
<br /> �_feet a5 1a.73 3.28 O.a8 �
<br /> • 50 3.99 0.58 I
<br /> 55 4.76 0.70
<br /> C. Pu.mp selection 6o s.6o o.az
<br /> } 1. A pump must be selected to deliver at least
<br /> _ '-1c� gpm (Step A) with at least 1'� feet of total head (Step B).
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