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' ` ' F-17 <br /> PUMP SELECTION PROCEDURE <br /> ENp PERFORATWN Of p PERFORATED LATERAL <br /> A. Determine pump capacity: w-•� <br /> Gravity Distribution T,,.,,, <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of _ . . •; :�,a�N�w�,k�„�,,. <br /> water use rate. ' ,`'""'�"'°`"'` �����.;'°""""'° <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 _ _ �*�^��^a�����^^���� <br /> Mh Ga0 lUor TOD <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. �.,,•�,Fh1e •,-e p«r '�;«°�°°` <br /> .. �Pvfre�kn lewtW at �� <br /> Pressure Distibution ���� �""'""`°"'°' <br /> 3.a. Select number of perforated laterals 3 . <br /> b. Select perforation spacing=�_feet. °""""sO"''~""5G1N0 <br /> B�hr.P�eoiy SaM�e�w <br /> c. Sub'tra•�2 ft.from the rock layer length. <br /> �-�-2 ft._• L!o feet <br /> d. Det rnune the number of spaces bet�veen perforations. <br /> I.ength perf.spacing=�ft.+�ft._�spaces Requirnd Perforaeon Dischazge <br /> e. �spaces+1=.��perforations/lateral �8�K P���ce�p�►> <br /> f. Multiply perforations per lateral by number of laterals to �/3�'� '�e ;�Z�� 4 "`"�'' <br /> get total number of perforations.� x �s���= L perforations. ��� <br /> g• -� x��r=-�$p� <br /> 1.Oa 0.74 <br /> SELECTED PUMP CAPACITY x gpm 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 dixharge. b.Use for all other applications <br /> �_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravitv s tem,zero. <br /> �S feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � Pipe Lcngch <br /> Read friction loss in feet per 100 feet from table. � Poinc of Discharge <br /> F.L._ �.b ft./100 ft of pipe �iD.0 <br /> b. Determine toml pipe length from pump to discharge Elevation Diffeisnce I <br /> poin� Add 25 percent to pipe length for fitting p�,p -94s► � <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> �x 1.25= �ov feet <br /> c. Calculate total friction loss by multiplying 1.5 inch 2.0 inch 3.0 inch <br /> �m Ftiaim 1oa pc]00 ft o[pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= �- x D 0 +100= � feet 10 0.69 0.20 <br /> � �_ i2 0.� ozs <br /> 4. Total head required is the sum of elevation difference, 14 iZ8 0.38 <br /> special head requirements,and total friction loss. 16 1.63 O.aB <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> �_+�_+ ? 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 �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 /> �_gpm (Step A) with at least �2 feet of total head (Step B). <br />