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PUMP SELECTION PROCEDL�E ' ` ' <br /> A. Determine pump capacity: <br /> \ Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum snggested is 600 gallons per hour(10 gpm)to stay ahead of W,w�,,,« <br /> water use rate. <br /> TopwU <br /> 2. Maximum suggested for delivQry to a drop box of a home system is 2,700 ` <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. �,�,�,,,,,�„�� ��`.L�er of Geouxtq�FoWk la tar- <br /> arer ol My a Mrw torer�d <br /> �'-' >`_ _�rrC�rosin paper! <br /> m•w a PKIu�clbn Orllhd Horizonlally <br /> Pressure Distribution • �,,, , r�a� �p <br /> 3. a. Select number of perforated laterals 3 .`��:�+�. , �, a �.a.� �2•�o �a9� <br /> __. .:_.,. _......-..,:�.. ...- ._. _,..',`.' „ o� rrocr�oyK <br /> b. Select perforation spacing= � ft. _-.�� F��a�« <br /> Pwfao�lan lacoi�d al <br /> c. Subtr ct 2 ft.from the rock layer length. c�.a,saw�,,., ������ �,•,�� <br /> � ,�, „� -2f�= (1. ,�ft. <br /> akNw�so�� v.opvlr 5car�nw <br /> B�fon Plockq So�d�ora <br /> d. Determine the number of spaoes between perforations. <br /> L.ength perf.spacing= (,co ft.+ �:, ft._ - � spaces TABLE OF PERApRATIpN DISCHARGFS IN GPM <br /> e. �a spaces+ 1 = �'J perforations/lateral <br /> ' f. Multiply perforaHons per lateral by number of laterals to Head Perforationdiameter(inches) <br /> get total number of perforations. � � <br /> �� x �_�perforations. �13� �p �• <br /> � 1.Oa OS6 0.74 <br /> r l S 0.69 0.90 <br /> g• � X aT=��gpm. 2.ob o.so �.oa <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY 3 G m 3.0 0.98 1.28 <br /> gP a.o i.i3 �.a� <br /> 5.0 1.26 i.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between um and int of dischar e. aUse lA foot of head for residential systems. <br /> D P � � bUse 2A feet of head for other establishments <br /> feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> _ �feet <br /> 3. Friction loss Pipe Lengch <br /> a. Enter fricHon loss table with gpm and pipe diamctcr. � Poinc oF D;scharge <br /> Read friction loss in feet per 100 feet from table. ;�vZ <br /> F.L. _ �, ft./100 ft of pipe Elevauon Diffcrence <br /> b. Determine total pipe length from pump to discharge p,�,p �3 <br /> point. Add 25 percent to pipe length for fitti►�g <br /> loss,or use a fitNng loss chart. Equivalent pipe F-18b <br /> length-1.25 times pipe length= ,/ 1.5;nch 2.0 inch 3.0 inch <br /> 3 l� X 1.25 = v�S fC'et gpm Friaim lou per l00 ft of pipe <br /> c. Calculate total friction loss by multiplying 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= ,:;`/ x � - �-, =]00=_�feet 14 1.28 0.38 <br /> 4. Total hcad required is the sum oE e;e�•ation di�Ecrcncr, 15 1.63 0.48 <br /> 18 2.03 0.60 <br /> special head requirements,and total frictiot� loss. 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> �D + � + f 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 039 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD � � feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> , C. Pump selection <br /> � 1. A pump must be selected to deli��er at least �'-i gprn (Step A) <br /> cvith at least� feet of total head (Step B). <br />