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, � <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. MaXiIIltlm SuggeStEG�i5 45 gpII1 perforaHon Disehuges in GPM <br /> Head Perforation diameter ' <br /> Pressure Distibution p� ��� <br /> 3. a. Select number of perforated laterals =S �/s2 �/4 <br /> b. Select perforadon spacing= -�� fee� �.oa o.56� 0.74 <br /> c. Subtract 2 ft.from the rocic layer length. 1.5 0.69 o.w <br /> . 20b 0.80 1.04 <br /> ,�����,,-2 ft.= S,_� feet. • <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Lellgth Pezf.spSCiri$_,��ft.+ �,ft._�spaces b Use 20 feet for anything else. <br /> e. �spaces+1 =�perforationa/lateral <br /> f. Multiply perforations per lateral by number of laterals to �1 y �r <br /> get total number of perforations. � x ��= 5�� perforations. <br /> g. � x��y =.�-�gpm. <br /> SELECT'ED PUMP CAPACTTY. LI O gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between p p and point of discharge. <br /> �feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure ������+�Sr�� <br /> required at manifold if gravity system,zero. a��.�o� <br /> �;�,_, <br /> � feet ����+aen <br /> 3. Friction loss <br /> � a. Enter friction loss table with gpm and pipe diameter. ��,����tt <br /> Read friction loss in feet per 100 feet from table(F-14). �'�` <br /> ------- -- - <br /> F.L._�ft/100 ft of PiPe . .__. �.,�-,_, <br /> ..-------- , , � <br /> b. Determule total pipe length from pump to dischazge --------------------------- <br /> point Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times pipe length= <br /> s� x 1.25= (o:� feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction loss by multiplying Nominal P <br /> friction loss in ft/100 ft by equivalent pipe length. pipe dia. <br /> Total friction Ioss= �•lo� x�_+100=_�feet �oW�� <br /> 4. Total head required is the sum of elevation difference, �� 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> �--+ r +�- 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> TOTAL HEAD �.�feet `� 8.91 264 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 5.60 0.82 <br /> � 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> � � gpm (Step A) with at least �s feet of total hea�i (Step B). <br />