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<br /> F-17
<br /> � g���-F�'►0N PROCEDimF
<br /> ElO PERFORATbl1 OF A PERfORATED LATERAL
<br /> A. Determine pnmp capadty;
<br /> Gravity Distributioa , `""�""
<br /> l. Minimum suggested is 6pp gallons per hour(10 gpm>to stay ahead of .�,..;.. ..T� .
<br /> e . VVa�c� u$e��• . . :, ����,� � j';tpr N GNMnIM faMb(r Isr-
<br /> .� � wu����ewwM
<br /> 2. MdXiII11lII1 SU b8d fOT C��V �..���5�y,••�....•�
<br /> 88� ery to a drop box of�home system is 2,700 .«+..��.ad,..,,.,„�.,,,
<br /> gallons per hour(45 gp�to prevent build-up of pressure in dro.p box. ,�;� �� `"`•°°����
<br /> Pressure Dittibution �:: .:.. •...
<br /> 3.a. Select number of perforatied laterals 3 �� ,`�'`""" ��~�N
<br /> b: Select perfora6on spacing a_ e fee� � �,...,.�.,,,�„�,,,
<br /> c. Su��s�t 2 ft irom the roslc layer length. ''""""'`"'°'°"'
<br /> �-2 fG= a•.5 feet
<br /> d. Deterniine the number of spaees bet�veen perforations.
<br /> e. LO �8� P� cing:6�.s fG+�ft.a�spaces �
<br /> spaces+1= Z _I perforatioas/lateral ��10 s��,wc�(�,Te
<br /> f. Muldply perforations per lateral t� number of laterals to ��
<br /> g. get to��yumber��orations. ,,�� x L�� 6 3 perforations. H�j �2"p'' �i�•�
<br /> '�a,* x�7'�:t'
<br /> S��P��A� � 1.Oa 0.56 0.74 .
<br /> -�--gp�' 2.Ob 0.80 1.04
<br /> . B.Determine head requirements
<br /> l• Elevatioa►difference between pump and point of discharge, a.Use for single family homes
<br /> .�,_feet b.Use for all other applications
<br /> � 2. If pumping to a pressure distribution system,five feet for pressure
<br /> required at manifold if gravity system,zem.
<br /> �_,feet
<br /> 3. Frictio�loss
<br /> a. Enter friction loss table with gpm and pipe diameter. �p�L,a,�ch
<br /> Read friction loss in feet per�100 feet from table. � � -,
<br /> F.L a .�.36 ft/100 ft of pipe Poinc of Discharge
<br /> b. Dete�mine total pipe length from pump to discharge T
<br /> point, Add 2S peroent to pipe length for fitting Elevatio�t Diffurncel
<br /> loss,or use a�itdng loss chart. Equivalent pipe p
<br /> length-1.25 timespipe leagth=
<br /> • . �S x 1.25= 8'� feet F-I8b
<br /> ' ' c. Calculate total friction loss by multiplying � � � -. ls ir�cf, 20�nch 3.o inca� .
<br /> , hic�tion loss in ft/100 h by equivalent pipe length. . . �` �"`�°"'°"°'10°n°�P�P'
<br /> Total friction loss= �S� x T I +100:_ 2_9 feet l0 0.69 0.20
<br /> 4. Total head required is the sum of elevation difference, 12 0.96 0.28
<br /> �special head requirements,and total friction loss, i6 1.� 0.48
<br /> � is 2.03 0.60
<br /> �_,} s ,F 2 .9 20 2.47 0.73 0.11
<br /> 2S 3.73 1.11 0.16
<br /> �i� �2� (3c� 30 5.23 1S5 0.23
<br /> � 35 7.90 206 0.30
<br /> TOTAL HEAD �Y feet � 11.07 2,64 p,3g
<br /> 45 14.73 3.28 0.48
<br /> �SO 3.99 OS8
<br /> C. Pump selection ss aa6 oao
<br /> 6o s.6o o.�
<br /> � • 1. A pump must be selected to deliver at least
<br /> y? gpm ,(Step A)with at least �feet of total head(Step B). ' ' ' '
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