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PLTMP 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 �„„�,,,�, <br /> water use rate. T� <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 _. . ,,y, ,. <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. �,,,,,y�„�,�,,„ `- �,,K�����•_�;,• FoWk(a tar- <br /> C ayer ol fay w u.as corerea <br /> .�..�vitA red ro�i�paperl <br /> - r a a P�tbrotion pUhd Ha'uonlollr <br /> Pressure Distribution • �„o , ,�a, �P <br /> 3. a. Select number of perforated laterals 3 ''�:�w , �, � �.a� �2•�o �u. <br /> ra FNid Roc �- ol Rock Loyer <br /> b. Select perforadon spacing= 3 ft. ^ . • °-P��aa������� a� <br /> c Subtract 2 ft.from the rock layer length. c�p�saw�,,., ������ ���•�a� <br /> �y�-��-2 ft._!Q�ft. <br /> a�a��son r.�nr sw�+nw <br /> BMon PlocYp Sond Layer <br /> d. Determine thc number of spaces between perforations. <br /> Length perf.spacing= •-�. ft.+ ' ft._ -_ spaces TABLE OF PERAORATION DISCHARGES IN CPM <br /> e. ` -= spaces+ l = -' 1• perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> ,-� '��n '�. <br /> �� x -� ��_ '�% perforations. <br /> �.o� Oss o.7a <br /> g' �` X g�' �,gpm. �s 0.69 0.90 <br /> 2.ob o.ao t.oa <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY � � m 3.0 0.98 1.28 <br /> gP a.o i.is �.a� <br /> 5.0 1.26 I.65 <br /> B.Determine head requirements: <br /> 1. Elevadon difference between um and oint of dischar C. aUse lA foot of head for residential systems. <br /> p P 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. Frietion loss Pipe Lengch <br /> 6 �. <br /> a. Enter friction loss table with gpm and pipe diameter. Poinc of Discharge <br /> Read friction loss in feet per 100 fect from table. �nd� <br /> F.L.= Z•�r ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge �,r„p �Z <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting]oss chart. Equivalei�t pipe F-18b <br /> length-1.25 times pipe length= <br /> 1.5 inch 2.0 inch 3.0 inch <br /> l 1 x 1.25 = �3 y feet gpm Friction loss per 100 ft of pipc <br /> c. Calculate total friction loss by multip]ying 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= _ a,(� x ] �'-/ 1100=�_feet 14 128 0.38 <br /> 4. Total head re ired is the sum of elevation diffcrcrlcc, 16 1.63 0.48 <br /> au 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 /> / 1 + s + �-/ 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 � 'J 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 /> with at least ='.�� feet of toEal head (Step B). <br />