Laserfiche WebLink
Oct. 19 06 09: 10a Josh Swedlund (952) 873-3292 p. 9 <br /> PUMP SELECTION PROCEDURE <br /> All boxed rectangles must be entered,the rest will be calculated. <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 soli treatment system <br /> &point or discharge <br /> Selected Pump Capacity: 28.6 gpm tocol pipe <br /> lenglt I <br /> I 2A.elevation <br /> Intel r .mitis;°rrtl !,' difference <br /> 2. Determine head requirements: pipe It's{ <br /> A. Elevation difference between pump and point of discharge. t >a�1 <br /> 8 feet ii t..............W..;.:•..., <br /> B. Special head requirement?(See Figure-Special Head Requirements) <br /> 5 feet Special Head Requirements <br /> Gravity Distribution Oft <br /> C. Friction loss Pressure Distribution 5ft <br /> 1. Select pipe diameter 2 in <br /> 2. Enter Figure E-9 with gpm(1A or B)and pipe diameter(C1) Eq Frfeticin Doss In Plastic Pipe <br /> Read friction loss in feet.-r 100 feet from Figure E-9 <br /> Per 100 feet <br /> Friction loss= 1.55 ft/100 ft of pipe <br /> nominal <br /> pipe diameter <br /> 3.Determine total pipe length from pump discharge to soil system discharge point. t flew rote 1.5 2' 3' <br /> Estimate by adding 25 percent to pipe length for fitting loss, m - --� �---�-�- <br /> E.uivalent'ile length times 1.25=total pipe length 20 2,47 0,73 0.11 <br /> 40 ftx1.25= 50 feet 2`} 3.73 T.TT 0.16 <br /> 30 5,23 1.55 0,23 <br /> 4.Calculate total friction loss by multiplying friction loss(C2) 35 r 6.96 2,06 0.3:1 <br /> by the equivalent pipe length(C3)and divide by 100. 40 8.41 2,64 0,39 <br /> FL= 1.55 ft/100ft X 50 ft I 100= 0.8 feet 65 11.07 3.28 0.48 <br /> 50 13.46 3.94 0.58 <br /> D. Total head requirement is the sum of elevation difference(A),special 55 4.76 0,70 <br /> head requirements(B),and total friction loss(C4). 60 5,60 0.82 <br /> 8 ft + 5 ft + 0.8 ft 65 6.48 0,95 <br /> Total Head: 13.8 feet <br /> 3. Pump Selection <br /> 1.A pump must be selected to deliver at least 28.6 gpm(1A or B) <br /> with at least 13.8 feet of total head(20). <br /> I herLLgnature) <br /> rtify thmp) this work in accordance with all applicable ordinances,rules and laws. <br /> 74+- (license#) /0 3 (date) <br />