Just for my curiosity but hoping someone knows about this.
I've got a BBQ LPG tank which I get refilled at the local place. Other option is the swap-and-go joints where you just take one out of the pile and off you go.
Some of the ones at the places around me that do them, the tanks look like they've been used to crush rocks or something. They banged and have deep rends in them for corners and all sorts of abuse.
I've only ever seen them get filled up, never "tested" for integrity anywhere. Does that happen as part of filling?
I just look at my well cared for one, and some of these rock bashers on the swap-and-go shelf and think I don't want to put one of those in my BBQ.