I work in propane and have since late 2015. Used to work in the yard refilling, re-valving, painting, etc. these cylinders and tanks.
One of those things I did was empty (purge) the tanks before I pulled the valves out. Normally you do this by hooking them to a burn tower that pulls the fuel out and burns it away like 15 feet above everyone’s head. My company didn’t have permission from the city for they do we set up a tower anyway and just let the fuel pour out of it. You can imagine how… Fucking stupid that was?
Many times (I literally cannot count) people walked out with lit cigarettes and I was ready to die.
There’s also the time my safety manager lit his flip flop on fire and kicked it over the propane dispenser WHILE IT WAS ON FIRE
Also: never swap your propane tanks at one of these cage services. Many of them will aim to give you a close to, or fully out of date tank so you cannot get them filled at a normal fill spot. They’re also insanely expensive. If the swap out is $25 for a 5-gallon tank then you’d need to be spending $5/gallon at the dispenser for it to be even close in price, and if your propane dispenser is selling it to you for that or more then you’re being fucked