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• F-17
<br /> PiJMP SELECTION PROCEDURE
<br /> . � � EW PERfURAT10N OF A PERfORATED LATERAL
<br /> A. Determine pump capadty: �-�«
<br /> Gravity Distribution �` r....�, �
<br /> 1. Minimum suggested is 600 gallons per hour(]0 gpm)to stay ahead of �`,�-•R,". -
<br /> ;:����' ;t�..wc..».,wrbe.Ktdre.•
<br /> water use rate. `�����,�,;"•.u"'.•
<br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 , , ►K*^��,a��»��.,�°^�.�h
<br /> �,»�w.. �
<br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ..,;„„ '-„�.o.� �Z•�e�a,.
<br /> , .��.�.,..
<br /> :,. ,,_.. _, .
<br /> ... . -�i..,.rot�.�.l.«�M.�
<br /> Pressure Distibution f ��^�� �"""«"'•"'
<br /> 3.a. Select number of perforated laterals 3
<br /> b. Select perforation spacing=�_feet .°�".�;;,.'�".,;;�""°
<br /> c. Subt�ra 2 ft from the rock layer length.
<br /> ��-2 ft= (.lo feeti
<br /> d. Determu�e the number of spaces between perforations.
<br /> I,ength perf.spacing=��ft.+�_ft.=3,3_spaces Reqv�ed perEoraeon th5ch e
<br /> e. �spaces+1=.�.�perforations/lateral m gauons p�a,;�,uce cgp:,�
<br /> f. Multiply perforadons per lateral by number of laterals to �/��;��,�, '�a e �z,,,,p,,, �ad�
<br /> get total number of perforations..� x �,� ,Q,,= c �perforations. �f��
<br /> g� �" X��`-��� 1.Oa 0.56 0.74
<br /> SELECT'ED PUNII'CAPACITY��gpm 2.�b 0.8� 1.�4
<br /> B.Determine head nquirements: 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 distri ution system,five feet for pressure
<br /> required at manifold if gravity s tem,zero.
<br /> S feet
<br /> 3. Friction loss
<br /> a. Enter friction loss table with gpm and pipe diameter. �P��B�
<br /> Read friction loss in feet per 100 feet from table. Poinc of D'u�har�
<br /> F.L= �.�c ft/100 ft of pipe io�
<br /> b. Determine total pipe length from pump to discharge Flcvation Diffetence�
<br /> poin� Add 25 percent to pipe length for fitting p� ���
<br /> loss,or use a fitting loss chart. Equivalent pipe P
<br /> length-1.25 dmes pipe length= F-i sb
<br /> `1� x 1.25=�_feet --
<br /> c. Calculate total friction loss b multi 1 n 1.5 inch 2.0 inch 3.0 inch
<br /> Y P Y� $ gpm �a;�,w..�i oo n�r P+a
<br /> friction loss in ft/100 h by equivalent pipe length. 10 0.69 0.20
<br /> Total hiction loss=- a,lo x�_+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 friction loss. 16 1.63 0.48
<br /> 18 2.03 0.60
<br /> / 20 2.47 0.73 0.11
<br /> � + J +�_ 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 2.64 039
<br /> TOTAL HEAD 1�_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.a2
<br /> 1. A pump must be selected to deliver at least
<br /> ��gpm�(Step A)witti at least jJ�_feeE of total head (Step B).
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