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F-17 <br /> P1nuP SELECTION PROCEDLmE <br /> E1D PEf7FORATION OF A PERFORATED LATERAI <br /> A. Determine pump capadty: �""�'" <br /> Gravity Distribution *�•�«� , �i,� <br /> ]. Minimum suggested is 600 gallons per hovr(]0 gpm)to stay ahead of � •. :�,��„�`�F,e,k�- <br /> water use rate. ,'' "•�,s•,•�,•• <br /> � .�,����� <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 .. . �M�;;�^„w""�"°"'°^'°", <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. ..,;p„ '-N�a.� �z•�<Ea,. <br /> q e/R«t Iq« <br /> . ..• ' � PrfxelMn LK�IK�1 <br /> Pressure Distibution `"'"'"'"" ��""�~`����� <br /> 3.a. Select number of perforated laterals 3 <br /> b. Select perforation spacing= -� feeti a':."'.�,:�;«""° <br /> c. Subtra 2 fti from the rock layer length. <br /> �� -2 ft.=�,r�_feet <br /> d. Det rnune the number of spaces between perforations. <br /> Length perf.spacing=�_ft.+�_ft._ �.a spaces Rcquired Pv(oration Dixh e <br /> e. �spaces+ 1 =� perforations/latezal m g�11°"'p�a""°ce cgp�'� <br /> f. Multiply perforadons per lateral by number of laterals to �)3����y� �H�d e �2"P,, � �d� <br /> get total number of perforations. �; x � ,Q,,_�perforations. �f�� <br /> g� �' "��''-��� 1.Oa 0.56 0.74 <br /> SELECTED PUMP CAPACI'TY.�,�gpm 2.0�j 0.80 1.�4 <br /> B.Determine head requirements: a. Use for single family homes <br /> 1. ElevaHon difference between pump and point of discharge. b.Use for all other applications <br /> � _feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity�stem,zero. <br /> S feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � p�P�L�"B� � <br /> Read friction loss in feet per 100 feet kom table. � Point of Dischazge <br /> F.L._ .Z. b ft./100 ft of pipe ti� <br /> b. Determine total pipe length from pump to discharge Elcvation Difference <br /> point. Add 25 percent to pipe length for fitting p�p �)-� <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 dmes pipe length= F-l8b <br /> �,�.��x 1.25= 1 SZ�eet 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying � fr;wa„�.,a.�ooa�P;a <br /> friction loss in ft/100 h by equivalent pipe length. <br /> Total fricdon loss= a, 4e ,x �S__�+100=_�feet 10 0.69 0.20 <br /> 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 038 <br /> special head requirements,and total friction loss. �6 1.63 0.48 <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> 7 +�_+� 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL�-iEAD _�_feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 6o s.bo o.s2 <br /> 1. A pump must be selected to deliver at least <br /> �gpm (Step A) with at least �feet of total head (Step B). <br />