I used Amber Bock for a couple of years and found that the internal preasure is usualy 2.5 volumes of gas at 32 degrees. This gives you about 11 PSI at 32 degrees. Bottom Line is if you have a keg that lasts a month or so it could absorb more CO2 than was in it originally. One thing to remember CO2 gas moves in and out of the beer in the keg so if more CO2, than its original amount, is placed on top of the beer the beer will absorb it. Consequently there will be more internal pressure than previous. Every 2 degrees increase in temperature gives you one more pound in internal pressure. If in doubt call Bud and ask them.
R.D.(Bob)Kirk
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