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• <br /> Sizing of Pump Station <br /> 1. Determine Surface Arca T <br /> Rectangle=Arca=L x W Width <br /> x = square feet 1 <br /> Length <br /> Circle=Area=it x(Radius) <br /> 3.14 x x = square feet Radius <br /> Other=Get Surface Area from Manufacturer a=3.14 <br /> square feet <br /> 2. Calculate Gallons Per Inch <br /> There are 7.5 gallons per cubic foot of volume,therefore you must multiply the area <br /> times the conversion factor and divide by 12 inches per foot to calculate gallons per inch <br /> Arca x 7.5 gpft 3+12 inchs per foot <br /> x 7.5+12 = Z e gallons/inch <br /> 3. Calculate Gallons to Cover Pump(with 2 inches of water covering pump) Estimatod Sewage(I ;in Gallons per day <br /> (Height(in)+2 inc es) x gallons/inch(#2) Number( <br /> lb + L/ )x 73 =3ZZ gallons of Type I Type II Type III Type <br /> Bedrooms Iv <br /> 4. Calculate Total Pumpout Volume 2 300 225 180 <br /> a. To maximize pump life select sump size for 4 to 5 pump operations per day. 3 450 300 218 60% <br /> 7'o gpd $ SSV gallons per dose 4 600 375 256 `hc <br /> velum <br /> b. Calculate drainback <br /> 1. Determine total pipelength, 3 o feet. 6 900 525 332 �1�1. <br /> g 7 1050 600 370 <br /> 2. Determine liquid volume of pipe, IZVJ gallons per 1(X)feet. 8 1200 675 408 columns <br /> 3. Multiply length by volume: Drainback quantity= <br /> 20 feet x/7 V3gallons/100 ft.= $gallons. <br /> Pipe diameter(inches) Cellons per 100 feel <br /> c. Total pump out volume equals dose volume+drainback 1 4.49 <br /> /6-27 gallons per dose+ (S--- gallons= /ys gallons 1.25 7.77 <br /> 1.5 10.58 <br /> 5. Calculate Volume for Alarm(typically 2 to 3 inches) 2 17.43 <br /> Depth(in)x gallons/inch(#2)= 2.5 24.87 <br /> �3 x 2 = gallons 3 38.4 <br /> 4 66.1 <br /> 6. Calculate Reserve Capacity(75%the daily flow) <br /> Dail flow(see page D-7)x.75= <br /> D x.75= SG Z gallons <br /> 7. Calculate total gallons y Reserve Capacity <br /> gallons over pump+gallons pumpout+gallons alarm+gallons reserve capcity <br /> #3+#4 c+#5+#6 <br /> 322 + /4:77,5 + VG + bGZ =/e 8-gallons T Alarm <br /> y Pump On <br /> 8. Total Depth (Total gallon divided by gallon per inch) <br /> Total Gallon(#7)+gallon/inch(#2) <br /> /O_ + 23 = '/7 inches To al Pumpout Volume <br /> Pump Off <br /> Pump Height <br /> 9. Float Separation Distance(equal total pumpout volume) <br /> Total pumpout volume(#4c)+gallons/inch(#2) <br /> /.1C . 23 =6 %i inches <br />