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2 Liter bottle burst pressure

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Biopyro » Tue Jan 04, 2011 7:58 am

Wrapping in duct tape just makes it go at a higher pressure. It stops it stretching for a bit, then it's helpless.
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Unread postAuthor: Fnord » Tue Jan 04, 2011 7:16 pm

First I'd like to agree with D hall and point out that trace amounts of whatever they cleaned the cylinder out with may end up in your drink. While it probably won't shorten your lifespan noticeably I doubt it will improve it either.

Second, if you fill up a bottle most of the way with water, there isn't going to be much stored energy available to damage your hands in the event of a failure. Figure 1 joule for every CC dead volume at 10 bar. Gloves and goggles are fine but at 75 psi the most chance you'll have of a bottle exploding is if your regulator fails.

Third, you can dissolve a lot of CO<sub>2</sub> in water. I think most soft drinks have perhaps 4.5 grams per liter(?) Obviously you'll want to experiment till it tastes right, but about 2 liters of gas to 1 liter of water would be a good starting point.

You may be better off just dropping some of those dry-ice turds in an open bottle of cold water. I've tried it and it works, but I don't know how strong you can get the carbonation this way.
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Unread postAuthor: saefroch » Tue Jan 04, 2011 7:21 pm

Fnord wrote:You may be better off just dropping some of those dry-ice turds in an open bottle of cold water. I've tried it and it works, but I don't know how strong you can get the carbonation this way.
At a guess, very high. It's a pressure-dependent reaction, and I don't need to look at a phase diagram to know that solid CO2 begins to appreciably form at room temperature way beyond 75psig.
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