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, , <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> CGravity Distribution �o PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of W,u�,yN <br /> water use rate. roow�� ��a ` <br /> ,r�'� <br /> 2. Maximum suggested for aelivery to a drop box of a home system is 2,700 <br /> ' `Loy�r of Geor�ctil� foMk(a tov- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. �«„y sa�a�,�, �-.,,�,,,o,.�,o,,�y a urow cwa�d <br /> '•"�,-:�.:. .;.:with red roain poper) <br /> er m • e a PerlaoNon Orlll�d Horizoo�olly <br /> Pressure Distribution � • • • ,�„ p ,�a, r„ <br /> 3. a. Select number of perforated laterals �? •-��.:�+�. , A� ��as� �z•�o Ed,� <br /> ro Fl�ld Rx y.. •� of Rock Layer <br /> b. Select perforation spacing= ? ft. -� ' � pKfaollons Low�ed o� <br /> c. Subtra t 2 ft.from the rock layer]ength. c,w�s�,a�,,., B011om o� �a�.�o� <br /> �-2 ft._ !.(. ft. <br /> a+w�oi son P.o�«ir s�or�nw <br /> B�lon Pbckp Sand Loyer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing=�ft.+ � ft._��spaces TABLE OF PERFORATION DISCHARGFS IN GPM <br /> e. �a. spaces+ 1 = �3 perforations/lateral <br /> ' f. Multiply perforaHons per lateral by number of]aterals to Head' Perforationdiameter(inches) <br /> get total number of perforations. � <br /> � �, � , <br /> �� x �?,�= L�� perforations. �l��. � �� <br /> �.o� os6 o.�a <br /> �� ���(o ]S 0.69 0.90 <br /> g� P� X aa^/P�-�-��m• 2.06 0.80 1.04 <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY m 3.0 0.98 1,2g <br /> --�-SP a.o ias �.a� <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevadon difference between um and ii�t of dischar e. aUse 1.0 foot of head for residential systems. <br /> �� pfeet � g bUse 20 feet of head for other establishments <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 Length <br /> a. Enter fricHon loss table�vith gpm and pipe diameter. � Point of Discharge <br /> Read friction loss in feet per 100 feet from table. �9 <br /> F.L._ � •So ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge p�,p �,�� <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times p� length= <br /> l� �x 1.25 = l33 feet 1•F�a�o�n 1�•0 inch 3.0 inch <br /> 8Pm P�+100 ft oC pipe <br /> c. Calculate total friction loss by multiplying 10 0.69 020 <br /> friction loss in ft/100 ft by equivalent pipe]cngth. 12 0.96 028 <br /> Total friction loss= a- C. x 1 33 +100=�_feet 14 1.28 038 <br /> 4. Total head rec�uired is the sum of elevation diffcrencc, 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 /> 25 3.73 1.11 0.16 <br /> � ) + S� +�►- _ 30 523 1.55 0.23 <br /> �1� �2? �3c� 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> 45 14.73 328 0.48 <br /> TOTAL HEAD a D feet 50 3.99 0.58 <br /> SS 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 /> w�ith at least� feet of toEal head (Step B). <br />