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F-17 <br /> ,��' TMP SELECTTON PROCEDURE <br /> E1D PERFORAiION OF n PERFORATED LATEQ/+L <br /> A. Determine pump capacity: �..•�.� <br /> Gravity Distribution *«.«� <br /> 1. Minimum suggested is 600 gallons per hour(]0 gpm)to stay ahead of � ,,�,.N„w F,e,k,,,,,,� <br /> water use rate. '`"�'�`�"� ��""•��"•�`� <br /> ��,����� <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . , ����;o���°^�°", <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. .:.,,•�,w -u�.,.� �:•�e E.a. <br /> o ie .r a«a w,« <br /> ... . � P.r�aawr lsm�w e� <br /> Pressure Distibution . "�^�°�°� �'�""'~`'""� <br /> 3.a. Select number of perforated laterals 3 ' <br /> b. Select perforation spacing= 3 feet �:;'�„�����"° <br /> c. Subtrad 2 ft from the rock layer length. <br /> ��-2ft=�feet <br /> d. Deter�rrune the number of spaces between perforations. <br /> ? ft.=L�spaces <br /> I.ength perf.spacing=3�ft.+ � Requimd Perforaaon Dischazge <br /> e. L spaces+ 1 = I� perforations/lateral �n�11°�per II"I"'�e�gp�'� <br /> f. Multiply perforations per lateral by number of laterals to �l y�a,p, ��e 32 m��", 4 ad� <br /> get total numberof perforations. �,�� x �„ �Q,,= � � perforations. �f�c) <br /> g. � X ��.�'=3�gP�,. 1.Oa 0.56 0.74 � <br /> SE�.ECI'ED PUMP CAPACTIY�gpm 2.�b 0.g� l.�t� <br /> B.Determine head requirements: a. Use for single family homes <br /> 1. Elevarion difference between pump and point of discharge. b. Use for ail other applications <br /> SS feet <br /> :;:^� 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity�stem,zero. <br /> �, feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. , �P�L�B� , <br /> Read friction loss in feet per 100 feet from table. � Poin�of Discharg� <br /> F.L=I , � ft./100 ft of pipe �'O�� <br /> b. Determine total pipe length from pump to discharge Elevatian Differrnce <br /> poinL Add 2S percent to pipe length for fitting p,u„p /ooc�, <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> 'L1(� x 1.25= 5� feet <br /> 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying �m Friaimloaper IOOfto(pipe <br /> friction loss in ft/100 h by equivalent pipe length. 10 0.69 0.20 <br /> To�l friction loss•= /• � x S 0 +100=_�feet 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 038 <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 /> � + �v� +� 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 /> � 40 11.07 2.64 0.39 <br /> TOTAL HEAD �_feet 45 1a.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 /> :� 31_gpm (Step A) with at least 1�feet of total head (Step B). <br /> � <br />