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Sizing of Pump Station <br /> 1. Determine Surface Area T <br /> Width <br /> Rectan lc-Area=L x W <br /> x�__—4,r square feet Length 1 <br /> Circle=Area=n 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 /> Area x 7.5 gpft I+12 inchs per foot <br /> --440 x 7.5+12 =$gallons/inch <br /> 3. Calculate Gallons to Cover Pump(with 2 inches of water covering pump) Estimated Sewage Flows in Gallons per day <br /> (Height(in)+2 inches) x gallons/inch(#2) (gpd) <br /> (1Q+ Z )x 2 gallons Number <br /> = 33(o$ of Type I Type It Type III Type <br /> Bedrooms 1 V <br /> 4. Calculate Total Pumpout Volume <br /> a. To maximize pump life select sump size for 4 to 5 pump operations per day. 3 a 0 300 218 60% <br /> +4= ��3 of the <br /> gpd gallons per dose 4 600 375 256 values <br /> b. Calculate drainback 5 750 450 294 in <br /> 1. Determine total i length, Y 0 feet. 7 1050 600 370 900 525 332 X 1 I. <br /> pipe $ n or <br /> 2. Determine liquid volume of pipe,f74 gallons per 1(X)feet. 8 1200 675 408 c,1°,ym <br /> 3. Multiply length by volume: Drainback quantity= <br /> 20 feet x17#4.gallons/100 ft._-.T—gallons. <br /> Pipe diameter inches Gallons qr 100 fmi <br /> c. Total pump out volume equals dose volume+drainback 4.49 <br /> /13 gallons per dose+ 3 gallons= // 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 02)= 2.5 24.87 <br /> x 2 = gallons 3 38.4 <br /> 66.1 <br /> 6. Calculate Reserve Capacity(75%the daily flow) <br /> Daily flow(see page D-7)x.75= <br /> 4S D x.75= 7 gallons <br /> 7. Calculate total gallons Reserve Capacity <br /> gallons over pump+gallons pumpout+gallons alarm+gallons reserve capcity <br /> #3+#4c+#5+#6 <br /> 3Sli + // +r4O +-?-?7 =8& gallons Y Alm <br /> 8. Total Depth (Total gallon divided by gallon per inch) Pump On <br /> Total Gallon(#7)+gallo /inch(#2) To 1 Pumpout Volumc <br /> v rs' +28 _ 0 inches Pump Off <br /> 9. Float Separation Distance(equal total pumpout volume) Pump Height <br /> Total pumpout volume 040+gallons/inch 02) <br /> 116+_8= 41 inches <br />