Small gas canister (50g)

[John K]

Had some time and messed with this some more. Tried a different canister and it seemed to work. The QC on the horn canisters seems to be a bit off. Picked one that looked like it has a “taller” valve. I can get 9 1-cup boils out of it. It’s a bit tippy, so best to be careful or maybe dig a small hole to put it in. :)

[Franco Darioli]

several possible solutions.

A hole, stones, long stakes and this one to boot :

[John K]

Love that one Franco! 🤓

[Nathaniel McHaffie]

John,

Sorry just to clarify: is that a kitchen torch canister you got to work or an air horn canister? If the latter, may I assume you discharged it and then refilled it yourself with butane?

Thanks!

[David Thomas]

I wonder if the cylindrical transfer valve (search Amazon  / eBay for “lindal refill valve”) would fit better down into that small well than the larger Gas Saver Plus version.

Hmmm.  Like “BRS-3000T”, the newer, cheaper version is now being listed under the old name.  The above more cylindrical style is now listed as a “Gas Saver Plus” for $8.82 (NewFrog) to $13 while what I knew as “Gas Saver Plus” – the boxier style sells for $30-40 Yankee dollars:

[David Thomas]

Great find on those air-horn canisters, John.  Thanks for persisting in the effort.  Guess I’m off to WestMarine and the boating aisle of Walmart (which is probably full of Halloween costumes now).

[John K]

Nathaniel, that is a recreational horn “air” canister (safety device for boating and also found in sports sections). They are usually filled with 1,1-Difluoroethane which has a higher vapor pressure than butane.

I emptied the device and refilled with butane.

I still need to find a better/different brand – the ones from WalMart are the ones that the valves sit a bit low (had to ‘try’ a few).

I also still need to get the tare weight and delta for the contents. The seem easy to over-fill, which would be bad.

@David, I like that smaller refill valve. I’ve got to try and get one of those. :)

[David Thomas]

Note that the “net weight” of those air horn canisters is for liquid 1,1-Difluoroethane and while, yeah, it’s an ethane backbone, fluorine (two of them!) are heavy.  The density of liquid 1,1-Difluoroethane is 2.7 g/cc while the density of liquid butane is 0.6 g/cc.  So figure you can put 22% as much butane in as 1,1-Difluoroethane it came with.

e.g. the 5.5 ounce version could be filled with 1.2 ounces of butane.

[John K]

Thanks David! That explains some of the weights I was seeing….I never would have thought it was more than 4x heavier.

[Jon Fong / Flat Cat Gear]

I saw this post (Trek-Lite) and I thiught that you small canister guys would be interested:20 g of fuel

https://www.trek-lite.com/index.php?threads/worlds-smallest-gas-canister-stove-system-brs-3000-plus-campingmoon-t-1d15.11738/

 

[John K]

Jon, definitely a cute looking canister. Seems pretty heavy for what it does though. 🤓

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