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As a general rule of thumb, it takes about a ½ Lb of CO2 to dispense a ¼ barrel of draft beer and 1 Lb of CO2 to dispense a ½ barrel of draft beer. This table lists the approximate number of kegs that can be dispensed from each size of CO2 cylinder.
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2-1/2 Pound Cylinder
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5 Pound Cylinder
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10 Pound Cylinder
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15 Pound Cylinder
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20 Pound Cylinder
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Home Brew (5.00 Gallon)
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7-11
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15-22
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31-44
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46-66
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62-87
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Sixth Barrel (5.23 Gallon)
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7-11
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14-21
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29-42
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44-63
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59-83
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Quarter Barrel (7.75 Gallon)
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5-7
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10-14
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20-28
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30-42
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40-56
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Half Barrel (15.50 Gallon)
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2-4
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5-7
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10-14
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15-21
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20-28
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A gas tank that is properly filled should read about 750 PSIG when the cylinder is at a 72°F temperature. CO2 gas pressure increases when it is exposed to heat, so if the gas tank temperature is above 72°F, the pressure will read higher than 750 PSIG. If the gas tank temperature is colder then 72°F, the pressure will read lower then 750 PSIG.
The tank pressure should read 750 PSIG until the liquid CO2 in the cylinder is gone, and the tank is almost empty. A decreasing pressure indicates the cylinder is nearly empty.
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