Thread: Single burner butane stoves

Originally Posted by PhilipA

The old ones could also explode if the trivet was not flipped from the storage position to the usage position, as I saw happen to a club member, who was perhaps from the shallow end.

Regards Philip A

I have three of the things, all great. Mine you can't operate the lever to open the gas bottle if the trivet is inverted.

Things are useless if there's a breeze though.

Originally Posted by austastar

The new cannisters have a pressure relief seal that will avoid rupturing the metal cannister completely.

My understanding is that these pressure relief valves do not work correctly when the relief valve is submerged under the liquid level. ie used horizontally.
Same concerns for transporting other packaged liquified gases (ie acetylene, CO2, or LPG)- the fail safe is inoperable if it's laying horizontally.

I find the portable Butane stove to be OK up here in QLD except on a cold frosty morning. Its weak then.
The Propane stove does not seem to have this problem.

Keith

Originally Posted by Toxic_Avenger

My understanding is that these pressure relief valves do not work correctly when the relief valve is submerged under the liquid level. ie used horizontally.
Same concerns for transporting other packaged liquified gases (ie acetylene, CO2, or LPG)- the fail safe is inoperable if it's laying horizontally.

Hi,
I think the saftey device is the round rubber seal going around the nozzle. I'm not certain of exactly how it works, but the position of the canister is keyed to position the rotation to a fixed angle, so a presumption would be that this would be a safety strategy.
Cheers

I see, more likely than not has a dip tube for the safety release valve then, if it's keyed.

Hi,
I should degas an empty one some time and check that.

I'm told that the saftey valve in lpg cylinders will only function for the vapour above the liquid, thus the requirement to have differing cylinders for dispensing liquid via a dip tube rather than the (shall we say backyard?) method of inverting the vapour (normal) cylinder to achieve a liquid delivery.

I don't have a good grasp of the physics of liquified gas storage, despite having a few mates in the industry.

Cheers

Be careful if you do pull one apart. Even 'empty', if it blows, you won't have much of a hand left.



You can see the pressure relief valve working in the above video.
Some cylinders use a fusible plug (acetylene for example)- once the lead core melts away, it's not going to re-seal. Others use a burst disc.

Only differences between a gas withdrawal LPG cylinder and a liquid withdrawal cylinder is the dip (eductor) tube, and the valve type.

Originally Posted by Toxic_Avenger

Be careful if you do pull one apart. Even 'empty', if it blows, you won't have much of a hand left.



You can see the pressure relief valve working in the above video.
Some cylinders use a fusible plug (acetylene for example)- once the lead core melts away, it's not going to re-seal. Others use a burst disc.

Only differences between a gas withdrawal LPG cylinder and a liquid withdrawal cylinder is the dip (eductor) tube, and the valve type.

Saw a metre deep crater caused by someone chucking an empty aerosol can on a bonfire once. Taught me to tread warily around disposable gas cylinders. Don't ask me about the Oxy cylinder torpedo. One reason you aren't suppose to lie them down.