Refilling non-refillable bottles ... A warning

[bigtree]

I know someone that overfilled their bottle as they were watching the £'s not the Litres, when they took it home they opened the bottle to release the excess gas which came out like liquid for a short while. It was a foreign propane bottle which didn't have the red blow off bung.

 

[Orion]

I'm not sure on the physics. I guess the gas vaporises at the surface. If the bottle is filled to the neck, there's only a tiny area that it'll vapor into. So if you open the valve, that bit will puff out, but it'll be replaced with more vapor only very slowly? Maybe???

This might explain some of the reason why a cylinder shouldn’t be completely filled with LPG.