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' I . <br /> PUMP SELECTION PROCEDURE <br /> ' 1. Determine pump capacity: <br /> A. Gravfty Distribution <br /> 1. Minimum required discharge is 10 gpm <br /> ' 2. Maximum suggested discharge is 45 gpm <br /> For other establishments at least 10%greater than the water <br /> supply rate,but no faster than the rate at which effluent will flow <br /> ' out of the distribution device. <br /> B. Pressure Distribution-see pressure design worksheet s�� ��ea�me.�r svs+er.� <br /> &pa^t�+hscho�ae <br /> , Selected Pump Capacity: 20 gpm To�a a�pe ' <br /> lengih <br /> �r�let��'". " '� 2A.c�tevutior.; <br /> 2. Determine head requirements: q� :� differe�•�E� <br /> �i <br /> A. Elevation difference between pump and point of discharge. " <br /> 1 4ii��r�::-------�--._._...._.....�-,--. <br /> 15 feet <br /> ' B. Special head requirement?(See Figure-Special Head Requirements) <br /> 0 feet Special Head Requirements <br /> Gravity Distributior Oft <br /> C. Friction loss Pressure Distributi 5ft <br /> ' 1. Select pipe diameter �in <br /> 2. Enter Figure E-9 with gpm(1A or B)and pipe diameter(C1) <br /> Read friction loss in feet per 100 feet from Figure E-9 E-9 Friction Loss in Plastic Pipe <br /> , Friction loss= 0.73 ft/100 ft of pipe pe��pp n <br /> nominal <br /> 3.Determine total pipe length from pump discharge to soil system discharge point. Flow Rate pipe diameter <br /> ' Estimate by adding 25 percent to pipe length for fitting loss. gpm 1.5' 2.0' 3' <br /> Equivalent pipe length times 1.25=total pipe length 20 2.47 0.73 0.11 <br /> 75 ft x 1.25= 93.75 feet 25 3.73 1.11 0.16 <br /> 30 5.23 1.55 0.23 <br /> ' 4.Calculate total friction loss by multiplying friction loss(C2) 35 6.96 2.06 0.3 <br /> by the equivalent pipe length(C3)and divide by 100. 40 8.91 2.64 0.39 <br /> FL= 0.73 t/100ft X 93.75 ft / 10� 0.7 feet 45 11.07 3.28 0.48 <br /> , 50 13.46 3.99 0.58 <br /> D. Total head requirement is the sum of e�evation difference(A),special 55 4.76 0.7 <br /> head requirements(B),and total friction loss(C4). 60 5.6 0.82 <br /> ' 15 ft + 0 ft + 0.7 ft 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> Total Head: 15.7 feet <br /> ' 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 20 gpm(1A or B) <br /> with at least 15.7 feet of total head(2D). <br /> ' <br /> ' <br /> , <br /> , <br /> tPage 1 of 1 <br />