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Sizing of Pump Station <br /> 1. Determine Surface Area T <br /> Rectangle=Area= L x W Width <br /> X = 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 arc 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 water covering pump) Estimated Sewage Flows in Gallons per day <br /> (Height(in)+2 inches) xgallons/inch(#2) Number (�) <br /> '161 + )x W _ gallons of Type I Type U Type III Type <br /> Bedrooms 1 V <br /> 4. Calculate Total Pumpout Volume <br /> a. To ma mtze pump life select sump size for 4 to 5 pump operations per day. 3 450 300 2225 18 � <br /> E 9 gpd+4= /s5O gallons per dose 4 600 375 256 °rthe <br /> ue <br /> b. Calculate drainback Cama <br /> 5 750 450 294 ;,, <br /> �1. <br /> 1. Determine total pipe length, -de6 900 525 332 1 <br /> et. 7 1050 600 370 <br /> 2. Determine liquid volume of pipe,JU gallons per 100 feet. 8 1200 675 408 colw= <br /> 3. Multiply length by volume: Drainback quantity= <br /> 5'feet x 17 14 gallons/100 ft._ ' agallons. <br /> Pipe diameter inches Gallam r 100 rest <br /> C. Total pump out volume equals dose volume+drainback 4. <br /> /Zb eallons per dose+ Z Z gallons= 17Z 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 /> Zd x Z _A-0 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 /> 6 x.75= -SCS gallons <br /> 7. Calculate total gallons A Reserve Capacity <br /> gallons over pump+gallons pumpout+gallons alarm+gallons reserve capcity <br /> #3+#4c+#5+#6 � P� p <br /> 240+ 12Z+�+�= t gallons Y Alarm <br /> 8. Total Depth (Total gallon divided by gallon per inch) Pump On <br /> Toth Gallon(#7)+ <br /> gallon/inch(#2) To 1 Pumpout Volume <br /> 0 + �O To Pump Off <br /> 9. Float Separation Distance(equal total pumpout volume) Pump Height <br /> Total numpout volu (#4c)+gallons/inch(#2) <br /> = .�inches <br />