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• <br /> Sizing of Pump Station <br /> 1. Determine Surface Arca T <br /> Rectangle=Area=L x W width <br /> x = square feet _' <br /> Length <br /> Circle=Area=t[ x(Radius$ <br /> 3.14 x x = square feet Radius <br /> Other 32Get Surface Area from Manufacturer s<=3.t4 <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 /> Area x 7.5 gpft 3+12 inchs per foot <br /> x 7.5+12 = gallons/inch <br /> 3. Calculate Gallons to Cover Pump(with 2 inches of waiter covering pump) Estimated Sewage Flows In Gallons per day <br /> (Height(in)+2 inches) x gallons/inch(#2) ( ) <br /> ( + )x gallons Ivoumber Type1 Type II Type DI <br /> Bedrooms • 7?pe <br /> IV <br /> 4. Calculate Total Pumpout Volume <br /> 380 <br /> a. To maximize pump life select sump size for 4 to 5 pump operations per day. 2 450 300 225 218 10% <br /> 0 O gpd+4= 1„co gallons per dose 4 600 375 256 N'"e <br /> b. Calculate drainback 5 750 450 294 ..In <br /> i <br /> 6 900 525 332 7Ypeat. <br /> 1. Determine total pipe length, 10 0 feet. 7 1050 600 370 'stn <br /> 2. Determine liquid volume of pipe, i c? gallons per 1(X)feet. 8 1200 675 408 esiw <br /> 3. Multiply length by volume: Drainback quantity= <br /> /o o :feet x i gallons/100 ft.at I e gallons. <br /> Pipe dinnegr(Indus) Odlions 9 fat <br /> c. Total pump out volume equals dose volume+drainback <br /> I SO gallons per dose+ gallons= / t( 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 /> x = gallons 3 38.4 <br /> 4 66.1 <br /> 6. Calculate Reserve Capacity(75%the daily flow) <br /> Daily flow(see page D-7)x.75= <br /> x.75= gallons <br /> 7. Calculate total gallons T Reserve Capacity <br /> gallons over pump+gallons pumpout+gallons alarm+gallons reserve capcity <br /> #3+ #4c+#5+#6 <br /> + + + = gallons 7 Alarm <br /> y Pump On <br /> 8. Total Depth (Total gallon divided by gallon per inch) <br /> Total Gallon(#7)+gallon/inch(#2) 7b al Pumpout Wlume <br /> + inches <br /> T Pump Off <br /> Pump Height <br /> 9. Float Separation Distance(equal total pumpout volume) <br /> Total pumpout volume(#4c)+gallons/inch(#2) <br /> + inches • <br />