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, PUMP SELECTION PROCEDU E <br /> ' 1. Determine pump capacity: <br /> A. Gravity 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 soii r;E�t�.,e�,f Sysren, <br /> & point of discharge <br /> ' Selected Pump Capacity: 20 gpm ��1�i ��pe �•��� <br /> ��ngtr� f <br /> ir�let � ?A., elevotlon' <br /> � 2. Determine head re uirements: ���� ""�'� a�ffe�ence) <br /> q �'��Je ;' �E i <br /> A. Elevation difference between pump and point of discharge. j I <br /> 10 feet ' " � <br /> ---- �_..._:..'�`:��Ey -. . _ .�..--- <br /> , B. Special head requirement?(See Figure-Special Head Requirements) <br /> ��feet Special Head Requirements <br /> � Gravity Distribution Oft <br /> C. Friction loss Pressure Distribution 5ft <br /> 1. Select pipe diameter C�in � <br /> � 2. Enter Figure E-9 with gpm(1A or B)and pipe diameter(C1) <br /> Read friction loss in feet er 100 feet from Figure E-9 E•9 Friction Loss in Plastic Pipe <br /> Friction loss= 0.73 ft/100 ft of pipe I per 100 ft <br /> , nominal <br /> 3. Determine total pipe length from pump discharge to soil system discharg point. Flow Rate i e 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 /> ,, 125 ft x 1.25= 156.25 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 ft/100ft X 156.25 ft / 100= 1.1 feet 45 11.07 3.28 0.48 <br /> 1 50 13.46 3.99 0.58 <br /> D. Total head requirement is the sum of elevation difference(A),special 55 4.76 0.7 <br /> head requirements(B),and total friction loss(C4). 60 5.6 0.82 <br /> ' 10 ft + 0 ft + 1.1 ft 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> Total Head: 11.1 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 11.1 feet of total head(2D). <br /> � I <br /> , I <br /> Page 1 of 1 <br /> , <br />