The equilibrium gauge pressure is 13 psig, so that means the absolute pressure is 13 + 14.7 = 27.7 psia. At 30 psig, the absolute pressure would be 14.7 + 30 = 44.7 psia. The excess CO2 partial pressure is 44.7 - 27.7 = 17 psia. The headspace volume is about 0.35 gal or 1.32 L. CO2 at 14.7 psia has a density of 1.977 g/L, so at 17 psia the headspace contains 1.32 L * 1.977 g/L * 17 psia/14.7 psia = 3 g of excess CO2.
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With the shaking, and smaller liquid volume, there is a chance that your beer was over-carbonated at the end of the 24 hrs @ 30 psig. The solution in that case is to bleed the excess pressure repeatedly until the carb level is acceptable.
It'll carb faster than a corny unless you overfill reducing the surface area significantly because of the domed top. If you fill to nominal capacity you should have the full width of the keg available for gas to go into solution. These kegs are wider than they are tall, with a diameter of almost 0.4 meters and a liquid height, when filled to nominal capacity, of a little less than 0.25 meters. That's really ideal for forced carbonation.
True for the cornys most of us use, but maybe not for the Euro Kegs discussed in the last few posts.
I'm going to need to try this soon. I mean, I carb in 12-15hrs but some day this will come handy. As for regulator I highly recommend this Harris I bought at AHB. I had two of the $40s Tap Rites and are ok bit flimsy. When one failed at one year I got the Harris. The difference is nigh and day. You can feel the quality. It is worth the double price. Plus it has a 7yr warranty. When the next one fails I'll get another Harris.
Are you saying that you weigh the CO2 tank during carbonation, and when it loses 1.23 oz, you stop carbing?
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It's hard to see the scale in the picture. Is it on a stand? What is the model name, etc.?anyway, the scale is only $27....my fridge sucks, so it still takes a couple dyas to get cold enough to pour though....(but i just need more full kegs in there!
That separate reading panel is quite handy!
