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Sizing o_ f Pum, Station <br /> 1. Determine Surface Area T <br /> Width <br /> Rectangle=Area=L x W r� <br /> x st square feet Length <br /> 1 <br /> Circle=Area=n x ff6diusr <br /> 3.14 x x square feet Radius <br /> Other=Get Surface Area from Manufacturer a=3.14 <br /> shuare feet <br /> 2. Calculate Gallons Per Inch <br /> There are 75 gallons per cubic foot of volume,therefore you must multiply the area <br /> times the conversion factor and divide by 12 inch,s per foot to calculate gallons per inch <br /> Arca x 7.5 gpf t'+]2 inchs per foot �� ,QQ,�,�q,�J <br /> x7.5+12 = o� gallons/Inch 000�" <br /> 3. Calculate Gallons to Cover Pump(with 2 inches of water covering pump) Estimated Scwa^,c Flows in Gallons per day <br /> (Height(in)+2 inches) x gallons/inch 02) <br /> (_(o +�)x QS' - 300 gallons of r Type I Type II Type III Type <br /> Dcdrooms I V <br /> 4. Calculate Total Pumpobt Volume <br /> a. To-maximize pump life select sump size for 4 to 5 pump operations per day. 3 a� 3020 2118 rA^ <br /> gpd+4 = 5o gallons per dose 600. 375 256 "hies <br /> b. Calculate drainback 450 294 <br /> 1. Determine total pipe length, /o feet. 6 900 525 332 hi <br /> r. <br /> P P g 7 1050 600 370 r <br /> 2. Determine7. <br /> liquid volume of pipe,14 gallons per 1W feet. 8 1200 675 408 ca111 <br /> r <br /> 3. Multiply length by volume: Drainback quantity= <br /> 0o feet x J7-If gallons/100 ft.as f7.14 gallons. <br /> c. Total puMp out volume equals dose volume+drainback P n.��tr ins. adra4 79100 <br /> ran <br /> _-JIL gallons per dose+ 1-7.9 gallons e j 6 7 gallons 1.25 7.77 <br /> 1.5 <br /> 5. Calculate Volume for Alarm(typically 2 to 3 inches) <br /> Depth(in)x gallons/inch 02)= 2.5 24.87 <br /> 3 x a-5 _� 75' gallons 3 38.4 <br /> 4 66.1 <br /> 6. Calculate Reserve CapAcity(75%the daily flow) <br /> Dailflow(see page D-7)x.75= <br /> °d x.75= 40 gallons <br /> 7. Calculate total gallons i YReserve Capacity ._- <br /> --- <br /> gallons over pump+gallons pumpout+gallons alarm+gallons reserve-capcity A 46S <br /> #3+flo c+#5+q 6 U„t, LL <br /> Sod + 14,7 + 3 S + by rO . ` Q gallons J000 Abm -�---- <br /> Pump On <br /> 8. Total Depth (Total gallon divided by gallon per inch) <br /> Total Gallon 07)+gallon/Inch(if2) 10for b tt <br /> j ooa +_ _ 0 Inches To I Pumpout Vblumc <br /> Pump Off <br /> r Pump Height a Ll <br /> 9. Float Separation Distance(equal total pumpout volume) 360 ik <br /> Total pumpout volume #4c)+gallons/inch 02) <br /> inches <br /> i� <br />