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DOSING CHAMBER SIZING with a Timer <br /> 1. Determinearea t Width <br /> A. Rectangle area=L x W � <br /> � ft x �ft = 0 ft� Length <br /> B. Circle area=3.14 x radius� <br /> 3.14 x 2 ft = 0.0 ft� <br /> C. Get area from manufac�rer tt2 Radiu <br /> 2. Calculate galbns per inch <br /> There are 7.5 gallons per cubic foot of volume,therefore multiply the area(1A,B or C) <br /> Gmes the conversion factor and divide by 12 inches per foot to calculate gallon per inch. <br /> Surface area x 7.5/12= flZ x 7.5 / 12in/ft = 6.9 gallon per inch Legal Tank: <br /> 500 gallons or <br /> 3. Calculate recommended capacity=average design flow(see chaR A-1J x 2 100%the dai�y flow <br /> 300 gpd x 2 = 600 gal or Alternating Pumps <br /> 4. Calculate total tank wlume <br /> A. Depth from bottom oi inlet pipe to tank bottom =�in A•1 Estlmated Sewage Flows in GPD <br /> B. Total tank volume=depth from bottom of inlet pipe to tank bottom(4A)x ga�n(2) Number of <br /> = 64 in x 6.9 gaUn = 441.6 gallons Bedrooms Class I Class II Class III Class IV <br /> 00 <br /> 5. Ca�ulate galbns to cover pump(with 2-3 inches of water covering pump) 3 450 300 216 the <br /> (Pump and block he ht+2 inches)x gallon per inch(2) 4 600 375 256 values <br /> ( 16 + 2 in) x 6.9 ga�n = 124.2 gallons 5 750 450 294 in the <br /> ti yUU D'LD 33'L Class I, <br /> 6. Ca�ulate total usable tank volume 7 1050 600 370 II ar II <br /> total tank volume in gallons(4)-gallons to cover pump(5) 8 1200 675 408 columns <br /> 441.6 gal - 124.2 gal = 317.4 gal <br /> 7. Calculate total pumpout volume <br /> A. Select pump size for 4-5 doses er day. Galbn per dose=gpd(see Figure A-1)/doses per day= <br /> 300 gpd ! 12 doseslday = 25 gallons <br /> B. Calculate dreinback E-20 VolumQ oi LI uid in PI <br /> 1. Detertnine btal pipe length 20.0 ft Pipe Diameter Liquid per foot <br /> 2. Detertnine Bquid volume of pipe, 0.17 gaU(t(see figure E-20) inches allons <br /> 3. Drainback quantity= 20 ff(7B1) x 0.17 gallft(762) 3.4 gallons 1 0.045 <br /> C. Total pump out volume=dose volume(7A)+drainback(7B3) 1.25 0.076 <br /> 25 gallons+ 3.4 gallons= 28.4 gallons 1.5 0.11 <br /> 2 0.17 <br /> B. Pump Rate 2.5 0.25 <br /> From design 20 gpm 3 0.38 <br /> or calculated: 4 0.66 ' <br /> chan e in de th(in)x gallon per inch(2)/time interval in min- pm <br /> �C4�in x 6.9 galrn / 60 min = 0.5 gpm <br /> H M <br /> 9. Calculate the timer ON setting �r+�� ' <br /> Dose gallons(7C)/gpm(B) �ti� ���co���.�+,. <br /> olo�rn�� <br /> 28.4 gal / 20.0 gpm = 1,4 minutes ON �: -- --- - =�'������ ' <br /> pur���c�u�vauna�-- __ <br /> �vr���on <br /> 10. Calculate the timer OFF setting �urr�p on t �;; <.ra�c+ <br /> minutes per day I doses per day-minutes on ���'.,,�,�"y �; <br /> u�.«.,�� <br /> 1440 I 12 doses/day-min on(9) 118.6 minutes OFF <br /> Page 1 of 1 <br />