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,' ,� PUMP SELECTION PROCEDURE <br /> A. Determine pump capacitq: <br /> Gravitq Distribution <br /> 1. Miaimum suggesbed is 20 gpm - <br /> 2 Maximum suggested is 45 SPm Perforahon u�GPM <br /> Disehu'8e�� <br /> Presauri Distibntion H� P�O1aO"d'�`�` <br /> feet incha <br /> 3.a. Select number of perforated laterals 3 ��s2 1/a <br /> b. Select perforation spacing=�_feet �.oa o.s6� o.�a <br /> c. Subttact 2 ft.fzom the rock layer length. ob o.o i.o�a <br /> ����-2 ft=�fee� • <br /> d. Determine the nuatber of spaces between perforations. a Use LO foot singie homa. <br /> j,ength p�f.spacing=(�ft+�,it=a c� spaces b Use 20 feec for anyctung eL,e. <br /> e. ��,spaces+1 =sZ!_perforations/lateral <br /> f. Multiply perforations per lateral b number of laterals to �!�?��,� <br /> �get total _ of perforahons. �; x �_�_perforations. <br /> S• � X�'��SP� <br /> SELECTED PUMP CAPACTTY 3.5� gpm <br /> B.Determiae head requiremenb: <br /> 1. IIevation difference between pump and point of discharge. <br /> _j I_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure ����� <br /> required at mazufold if gravity stem,zero. � <br /> S fcet Tom qp.k+s�t► �°,� <br /> 3. Frictiost loss <br /> a. Enter friction loss table with gpm and pipe diameter. �,,,,,,,� <br /> Read fric�on loss in feet per 100 feet from table(F-14). �`�' <br /> F.L= •a o � ft/100 ft of pipe ,� � <br /> b. Det�ernnine total pipe length finm pump to dischazge ...................................�I <br /> poin� Estimate by adding 25 parent to pipe leagth for fitting <br /> loss,or use a fitting loss chart(F-15=�eet). <br /> Equivalent pipe length-1.25 times pipe I�gth= <br /> �x 1.25=��feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 R by eqmvalent ipe length. NO�� <br /> Total friction loss= a-�x 1 �� +100=�_feet pipe dia. <br /> Flow Ra 1 S,• 2„ 3„ <br /> 4. Total head required is the sum of elevation difference, �m <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> !�_+ � +� 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 3U 5.?3 1.55 0.23 <br /> 35 6.% 206 '� 0.30 <br /> TOTAL HEAD a� feet '� 8.91 264 0.39 <br /> 45 I1.07 3.28 0.48 <br /> 50 13.46 3.99 OS8 <br /> G Pump selection 6o s bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> �� gpm (Step A)with at least �Q_feet of total heati(Step B). <br />