Just thought I'd throw this out there, I know some of you are aware of this, but not everyone. Since the last post had mention of the huge pressures that can be encountered when liquid propane gets trapped without heed to expansion.

When manifolding several tanks together, it is possible to get migration of propane between the tanks. (or any liquid phase compressed gas such as carbon dioxide or nitrous oxide)

An easy way to cause this to happen would be, say, if you had a few tanks manifolded together and suddenly changed the temperature of one of the tanks, while all of the valves are open. If you took one tank and tossed it in a hot water bath while the other tanks remained at atmospheric temp, propane would migrate from the warmer tank and condense in the colder tanks.

This could potentially lead to one or more tanks becoming dangerously overfull.

I now return you to your regularly scheduled whatever.