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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of �.a., c,,,„ <br /> water use rate. ; � <br /> To0wi1 <br /> 2, Maximum suggested for delivery to a drop box of a home system is 2,700 _ ,_., .. , . ,:.. <br /> .. . .��.`...:.LaYer of Geol�itil� FoWlc(or far• <br /> gallons per hour{45 gpm)to prevent build-up of pressure in drop box. ��„Y sa�a�ri. �,,K„„Y.,,, �,y„,,,,,,,�an., <br /> �� rifh red fosin paper) <br /> er or e o Psr�orotion Drlll�d HorizoMolly <br /> Pressure Distribution '"'° `'P "`°` r°° <br /> 3. a. Select number of perforated laterals ��%P��+ ,ti, A� ��af� �z•�o Eaa� <br /> rain Fl�ld Rock' ,��-i• of Rxk Layer <br /> b. Select perforation spacing= ft. -' ' P,;raa,io��'����a a� <br /> c. Subtract 2 ft. from the rock layer length. c�w�s��a �w, eo��om o� �a�.,a� <br /> r Ye� ��, -2 ft. = ft. : <br /> Or101na1 Soll Propuly ScoriflM <br /> Belore Placi�p Sand �ayn <br /> d. Determine the number of spaces between perforations. <br /> Length perf. spacing= ft. + ft.= spaces TABLE OF PERFORATTON DISCHARGES IN GPtvi <br /> e. spaces+ 1 = perforations/lateral <br /> ' f. Multiply perforations per lateral by number of la terals to Head Perforation diameter(inches) <br /> get total number of perforations. �� ,� <br /> �.s x , tera1= perforations. " � <br /> 1.Oa OS6 0.74 <br /> ]S 0.69 0.90 <br /> g. �� x gp.��= gpm• _ z.ob o.so l.oa <br /> - 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY 3.0 o.9s 1.2s <br /> � $Pm 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> aUse 1.0 foot of head for residenrial systems. <br /> 1. Elevarion difference between��mp and point of disCharge. bUse 20 feet of head for ocher establishmencs <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 fricrion]oss table with gpm and pipe diameter. Poinc oE Disch�ge <br /> Read friction loss in feet per 100 feet from table. <br /> F.L. _�ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge p„n,p <br /> point. Add 25 percent ta pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-l8b <br /> length-1.25 tiI11eS p�length� 1.5 inch 2.0 inch 3.0 inch <br /> -7� x 1.25 = � feet gpm Friction loss per 100 ft of pipa <br /> c. Calculate total friction loss by multiplying l0 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 4.28 <br /> Total fricdon loss= �x�+100= 3 feet 14 1.28 038 <br /> 4. Total head r uired is the sum of elevation difference, 16 1.63 0.48 <br /> � 18 2.03 0.60 <br /> special head requirements,and total friction loss. ' 20 2.47 0.73 0.11 <br /> 2S 3J3 1.11 0.16 <br /> �� + �� + 3 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 ' 030 <br /> 40 11.07 2.b4 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD 23 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 deliver at least �> gpm (Step A) � ` <br /> with at least z3 feet of Eotal head (Step B). <br />