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Sizing of Pump Station <br /> 1. Determine Surface Area T <br /> Width <br /> Rectangle=Area=L x W .1_ <br /> x = square feet — Length <br /> Circle=Area=it x(Radius)? <br /> 3.14 x x = square feet Radius <br /> it=3.14 <br /> Other=Get Surface Area from Manufacturer <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 arca <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 =.4:::—.1 gallons/inch <br /> 3. Calculate Gallons to Cover Pump(with 2 inches of water covering pump) Estimated Sewage Flows in Gallons per day <br /> (gpd) <br /> (Height(in)+2 inches) x gallons/inch(#2) <br /> Number I <br /> ( 4,-. + : ,- )x t3 _ .f6,iiallons <br /> g of Type I Type I[ 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 /> e E;t7 gpd+4= I-17, gallons per dose 4 600 375 256 of1t� <br /> b. Calculate drainback 5 750 450 294 in <br /> 6 900 525 332 1Ype I, <br /> 1. Determine total pipe length, 4C) feet. 7 1050 600 370 11 <br /> 17 <br /> Determine liquid volume of pipe,f7 4.gallons per 1(H)feet. 8 1200 675 408 columns°r <br /> 3. Multiply length by volume: Drainback quantity= <br /> 4r, feet x 174 gallons/100 ft.= 7 gallons. <br /> Pipe diameter(inches) Gallons per 100 feet <br /> c. Total pump out volume equals dose volume+drainback 1 4.49 <br /> I Ct"� gallonsper dose+ 7gallons= e £ ^ 7gallons <br /> 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 = /,;'"f 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 /> 6u'-) x.75-.44.60'gallons <br /> y Reserve Capacity <br /> 7. Calculate total gallons <br /> gallons over pump+gallons pumpout+gallons alarm+gallons reserve capcity <br /> #3+#4c+#5+#6 <br /> - ./:4;•:.L+ 1�,/ + /:pti + / 0_ �" gallons y Alarm <br /> T Pump On <br /> 8. Total Depth (Total gallon divided by gallon per inch) A ' <br /> Total Gallon(#7)+gallon/ ch(#2) To al Pumpout Volume <br /> ( <br /> ' A...(, + 7'g = 's inches <br /> �' y Pump Off v <br /> Pump Height& <br /> 9. Float Separation Distance(equal total pumpout volume) <br /> Total pympout volume(#4c)+gallons/inch (#2) <br /> 1 1 + % = 1 inches <br />