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_ �, � <br /> ' PUMP SEJ�ECTION PROCEDURE <br /> A. Determine pump capacity: <br /> . Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation n�a��in�Ptvt <br /> Pressure Distibution Head Pecforation dtameter ' <br /> feet inches <br /> 3, a. Select number of perforated lateraLs � � 32 1 4 <br /> b. Select perforation spacing= 3 feet. i.oa o.56' � 0.�4 <br /> c. Subtract 2 ft. from the rock layer length. ls o,69 0.90 <br /> x����i�,' <br /> 2 ft._�feet. 206 0,80 �.oa <br /> d. Determute t�ie number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length pe2'f.spacing=��ft.+ 3 h=�_spaces b Use 20 feet for anything else. <br /> e. .�spaces+ 1 =.J�perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to �)y''�,�, <br /> get total number of perforatior�s. � x � , + _ �!� perforaHons. <br /> g. �s x�„�� =,�L gpm. <br /> SELECTED PUMP CAPACITY�.,1_gpm <br /> B.Deteratine head requirements: <br /> L Elevation difference between pump and point of dischazge. � <br /> �,�_feet <br /> 2. If pumping to a pressure distribution system,Eive feet for pressure ����+ri�^ <br /> required at manifold if gravity s stem,zero. ' a� <br /> �� feet T�v�v���+s�, /�`! <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � �,�,,,�„�� <br /> Read friction loss in feet per 100 feet hom table(F-14). �'�` <br /> F.L._ ��ft./100 ft oE pipe ....... .. . <br /> .�...�.....�.. . <br /> _, <br /> b. Deterutine total pipe length from pump to ciischarge ----•................................ -� <br /> poin� 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 /> 1�a x 1.25= �;� � feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> hiction loss in R/100 ft by equivalent pipe length. Nominal <br /> Total friction loss= !� �. x a I a +100= 3 feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, F7ow Rate 1.5" 2" 3" <br /> special head requirements, and total friction loss, <br /> SP� <br /> 20 2.47 0.73 0.11 <br /> 1 1 + S +,�_, 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 /> 40 8.91 264 0.39 <br /> TOTAL HEAD �_feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pum selection 55 4.76 0.70 <br /> P bo s.�o o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least � <br /> '2 _gpm (Step A) with at least 1� feet o# total hea�i (Step B). <br />