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DOSING CHAMBER SIZING with a Timer ' , <br /> 1. Determine area t Width <br /> A. Rectangle area=L x W � <br /> 0 ft x Oft = 0 ft� a � � <br /> Length <br /> B. Circle area=3.14 x radius2 <br /> 3.14 x 2(t = 0.0 ft� � <br /> C. Get area from manufacturer ft Radiu <br /> 2. Calculate gallons per inch <br /> There are 7.5 gallons per cubic foot of volume,therefore multiply the area(1A,B or C) <br /> times the conversion factor and divide by 12 inches per foot to calculate gallon per inch. � <br /> Surface area x 7.5/12= f� x 7.5 I 12inlft = 8.1 gallon per inch Leg21 Tank: <br /> 500 gallons or <br /> 3. Calculate recommended capacity=average design flow(see chart A-1) x 2 100%the daily flow ' <br /> 300 gpd x 2 = 600 gal or Alternating Pumps <br /> 4. Calculate total tank volume <br /> A. Depth from bottom of inlet pipe to tank bottom = 64 in A-1 Estimated Sewage Flows in GPD � <br /> B. Total tank volume=depth from bottom of inlet pipe to tank bottom(4A)x gallin(2) Number of <br /> = 64 in x 8.1 gallin = 518.4 gallons Bedrooms Class I Class II Class III Class IV <br /> 00 <br /> 5. Calculate gallons to cover pump(with 2-3 inches of water covering pump) 3 450 300 218 the � <br /> (Pump and block hei ht+2 inches)x gallon per inch(2) 4 600 375 256 values <br /> ( 16 + 2 in) x 8.1 gal/in = 145.8 gallons 5 750 450 294 in the <br /> ti yuu 5zo 3s� uass i, <br /> 6. Calculate total usable tank volume 7 1050 600 370 II or II � <br /> total tank volume in gallons(4)-gallons to cover pump(5) 8 1200 675 408 columns <br /> 518.4 gal - 145.8 gal = 372.6 gal <br /> 7. Calculate total pumpout volume � <br /> A. Select pump size for 4-5 doses per day. Gallon per dose=gpd(see Figure A-1)l doses per day= <br /> 300 gpd / 12 doseslday = 25 gallons <br /> B. Calculate drainback E•20 Volume of Li uid in Pi e <br /> 1. Determine total pipe length 120.0 ft Pipe Diameter Liquid per foot , <br /> 2. Determine liquid volume of pipe, 0.17 gal/ft(see figure E-20) inches ailons <br /> 3. Drainback quantity= 120 ft(7B1) x 0.17 gal/ft(762) 20.4 gallons 1 0.045 <br /> C. Total pump out volume=dose volume(7A)+drainback(763) 1.25 0.078 <br /> 25 gallons+ 20.4 gallons= 45.4 gallons 1.5 0.11 ' <br /> 2 0.17 <br /> 8. Pump Rate 2.5 0.25 <br /> From design 20 gpm 3 0.38 <br /> or calculated: 4 0.66 � <br /> chan�th(in)x gallon per inch(2)/time interval in�pm <br /> 4 in x 8.1 gallin / 60 min = 0.5 gpm � <br /> 9. Calculate the timer ON setting r�:�, `=`-R------==--� <br /> Dose gallons(7C)/gpm(8) ' ��< <[�� � �,+ � � <br /> 45.4 gal ! 20.0 gpm = 2.3 minutes ON � -- _ > • <br /> i"rr,r.,,. v ma� <br /> �ur�i. <br /> 10. Calculate the timer OFF setting ,!�,rr��",�� r -.� , � <br /> minutes per day/doses per day-minutes on �<< `.is�,,�,:��'���'<<i„�,j.�.; :� <br /> 1440 / 12 doses/day-min on(9) 117.7 minutes OFF <br /> � <br /> ' <br /> 1 <br /> � <br /> Page 1 of 1 <br /> ' <br />