Gas bottle colors and why most of them are orange?
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Depends entirely on the country.
In Europe most are the same colour cylinder but they have a coloured collar on them.
Some of the more dangerous gases, such as Acetylene and Hydrogen are Maroon or Red respectively.
Inert gases are typically one colour with a collar.
This is to do with recycling them as you can easily purge a nitrogen cylinder and fill it with Argon.
Whereas Acetylene gas is suspended in a weird structure to keep it stable.
https://www.outsource-safety.co.uk/safety-news/colour-coding-and-labelling-of-gas-cylinders/
Have a look here for all the varieties we use at present, it does happen to change every few years.
Orange we’d typically associate with propane or butane gas. But nowadays it doesn’t, it comes in a fibreglass bottle that you can actually see the level of liquid inside it.
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