How do I get a stuck gas canister (for hiking/camping) out of a stainless steel mug?
I nested my 110g gas canister inside my stainless steel mug for a hike. I used it about halfway through for lunch, and when I was done put it back in the way I had packed it (upside down). Now it is stuck.
My guess is that the canister was at the cooler outside temperature, but the mug had expanded during the cooking. After I put the canister back inside the mug, the mug shrank around it.
The threaded connection for the gas canister is facing top-down in the mug.
How can I safely get the stuck gas canister out of the steel mug? Any ideas?
You can use hot glue sticks to pull it out. Warm a couple of glue sticks from one end and stick to the visible area of t …
5y ago
How did this happen? Yes, the mug was warm. But also, the gas canister got colder. It is stored in liquid form, but yo …
5y ago
The coefficient of expansion of mild steel is about 12. The coefficient of expansion of 304 stainless steel is about 17. …
5y ago
Duct tape a loop of twine or a shoe lace to the visible face of the canister. Then pull the canister out.
5y ago
Put a few drops of oil into the mug where it meets the canister. If the oil can seep past there, into the mug, add as mu …
5y ago
Soak the mug in a sink of hot water to warm it up quickly. Be prepared to pry the gas cartridge out quickly, perhaps usi …
5y ago
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Duct tape a loop of twine or a shoe lace to the visible face of the canister. Then pull the canister out.
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You can use hot glue sticks to pull it out. Warm a couple of glue sticks from one end and stick to the visible area of the canister. Let it cool down. Now the glue sticks will act as a handle to the can. You can pull the can out slowly. If glue gets removed, try again a couple of times. You can also use this method along with putting the mug in hot water for a few moments.
Search for "hot glue dent puller" videos on youtube for more information.
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Put a few drops of oil into the mug where it meets the canister. If the oil can seep past there, into the mug, add as much oil as possible. See whether you can twist the canister out. If not: Chill the whole assembly. Get tools to handle the mug and canister. Heat the mug in very hot water, and pry it out. Twist as you pry.
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How did this happen?
Yes, the mug was warm. But also, the gas canister got colder. It is stored in liquid form, but you use it in gaseous form. That means as you use it, the liquid gas must boil. To transition from liquid to gaseous state, the liquid gas must absorb heat energy equal to its latent heat of vaporization. It steals that energy by chilling (taking heat from) the remaining liquid and container. Quite colder; you can often see a "frost line" at the liquid level.
(If you're wondering, yes, this tech can be used to make air conditioners. That’s how they work.)
Then, once nestled into the mug, the gas canister warmed up to ambient.
Getting it loose
Start with the whole assembly in the freezer. Give it 6 hours for the liquid gas to get quite cold. Then, pop the mug quickly into the warmest water you can bear. The mug will heat up quickly and expand. The liquid gas is a substantial thermal mass that will make the canister take longer to warm up. You should have a short window of opportunity to separate it.
If not, try again. Just don't handle it in a way that would make it worse!
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The coefficient of expansion of mild steel is about 12. The coefficient of expansion of 304 stainless steel is about 17. This means the cup expands more with heat than the cannister, so warming the whole assembly should loosen it.
If it was a porcelain, glass, stoneware or other pottery cup, the advice would be the other way around. Coefficient for porcelain is about 4 and of regular pottery is about 5.
Use of lubricant such as vegetable oil is also a great idea.
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Soak the mug in a sink of hot water to warm it up quickly. Be prepared to pry the gas cartridge out quickly, perhaps using small screwdrivers or needle nose pliers. The thermal mass of the gas in the cartridge will help slow it heating. Some shaking may help.
Then, don’t do that again;)!
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