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PT7MP SELECTION PROCEDURE pertorction Discharges in gpm <br /> A. Determine pump capacity: perforation diameter <br /> gravity distribution head �nches <br /> ..Minimum required discharge is 10 gpm (feet) 1/8* 3/16 7/32 1/4 <br /> `:2.Maximum suggested discharge i 45 m 1 Ao 0.18 0,42 0.56 0.74 <br /> pressure distribution 2•Ob 0.26 0.59 0.80 1.04 <br /> see pressure design worksheeet 5.0 0.41 0.94 1.26 1.65 <br /> Selected pump capacity: y� gpm M,�,-x. °Use 1.0 foot for single-famlly homes. <br /> b Use 2.0 feet for anythlrrg else. <br /> ' Potentlal for plugging <br /> B. Determine head requirements: <br /> 1.Elevation difference between pump and point of discharge. <br /> �_feet <br /> 2.Special head requirement: • <br /> If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold.If gravity system,zero. " feet � <br /> _ soil treatment ^ <br /> J...i / <br /> 3.Friction loss ' system .,, .:a w.s... 9 <br /> a.Enter friction loss table with gpm and pipe diameter. 1e� �� <br /> Read friction loss in feet per 100 fee�from table. in�et defference <br /> F.L. _ �'zg ft./100 ft of pipe p�� <br /> b.Determine total pipe length from pump to discharge ���������-��•-�•� � • ____..�� <br /> point.Estimate by adding 25 percent to pipe length for fitting <br /> loss.Equivalent pipe length times 1.25 =total pipe length <br /> �x 1.25 =�_feet <br /> c.Calculate total friction loss by multiplying friction loss Friction loaa in Plastic Pipe <br /> in ft/100 ft by equivalent pipe length. Per 100 teet <br /> Total friction loss= 3•a�S x�_+100= 3 �feet p(pe diameter <br /> 4.Total head required is the sum of elevation difference,special head flomrate 1.5" 2" 3" <br /> requirements,and total friction loss. 20 2.47 0.73 0,11 <br /> )Z + - + 3 (1) (2) (3�) <br /> Total head: I� feet so 5.2s i.� o.2s <br /> 35 6.96 2.06 0.30 <br /> 45 11.07 3.28 F�0.48 <br /> C. Pump selection 50 13.46 3.99 0,58 <br /> 'xt� , <br /> 1.A puxnp must be selected to deliver at least 4�S gpm wi 60 5.60 0.82 <br /> (Step A)with at least�_feet of total head (Step B). 65 6.48 0.95 <br /> 70 7.44 1.09 <br />