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pUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> \ <br /> Gravity Distribudon ENO PERFORATION OF A PERFORATED t,ATERAL <br /> l. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of �,a.�,,,., <br /> water use rate. • T� ,,, � <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 .,;,_."..;,._,,, .... . ..:,;,..,,.,,... . <br /> ,}�`��`-�.'• • ..•�'` �r of Geolatil�FoDrk la fov- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. �r=: �.�„s��a,,y.. ��i�om a noy w aro.�.w <br /> - +.-..<,�.:... �:�rirA red rain papr) <br /> Mrlorotio�pNMd ilalaonrolty <br /> Pressure Distn uhon � <br /> Nte p IMa Top <br /> 3. a. Select number of perforated laterals�_ '�• �w , a �'°�' 12•'� �o• <br /> a FNI Ra �� •' of Rock Loya <br /> b. Select perforation spacing=�_ft. ����'` " "�'° " <br /> ��Palaatlais Loco�ed ol <br /> c. Su tract 2 ft.from the rock layer length. <br /> i.' GI�SaW tnrir Bo�ren�01 La��rc1 <br /> �-2ft.=�_ft. - <br /> ��i�o�a s�o�a�o�inw <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing=�ft.+�ft._�spaces TABLE OF PERFORATION DISCHARGES W CPM <br /> e. �'L spaces+1 =�_perforations/lateral <br /> ' f. Muldply perforations per lateral by number of laterals to Head Perforation diametv(i�uuhes) <br /> get total nu�r of perforations. <br /> �� x �= S�_perforations. ��" ��' <br /> t.oa osb oaa <br /> g. � x�_ �• gpm. 2� o� i.o�a <br /> 2S 0.89 1.1� <br /> 3.0 0.98 1.28 <br /> SELECTED PUMP CAPACITY •! C� gpm 4A 1a3 1.47 <br /> SA 1.26 1.65 <br /> B.Determine head requirements: au6e�.o fooc ot t�ead tor r�s;a�,�t syscems. <br /> �,1. Elevadon difference between pump and point of discharge. 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 , ���'g� � <br /> a. Enter friction loss table with gpm and pipe diameter. � Poinc of Discharge <br /> Read friction loss in feet per 100 feet from table. '�O <br /> F.L»_ .lo ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge p„R,p c�3 <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 pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> [.� x 1.25=��feet gpn, r���«.�iao s�c�ea <br /> c. Calculate total fricdon loss by multiplying 10 0.69 0.20 <br /> � hiction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= �d � x a•(�y +100=�_feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> s ial head u'irements,and total friction loss. 18 2•03 0.60 <br /> P� �Q 20 2.47 0.73 0.11 <br /> � 2S 3.73 1.11 0.16 <br /> _�_+ S� +�_ 3U 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 030 <br /> 40 11.07 2.64 0.39 <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 deliver at least Ll D gpm (Step A) <br /> with at least 1�.feet of toEal head (Step B). <br />