co2 bottle blow out!

[monza]

An interesting co2 story:

Dropped by a gas supply filling business today to refill my 5lb. bottle of co2 and they had a good laugh at the size of it, said they would fill it for free it was so small.
Went to the back and saw why they laughed, they were filling huge bottles, massive tanks that needed a crane to move in. So they hook mine up he asked the size I said five lbs. he said no it’s ten lbs. So we checked the bottle and he came up with eight and filled it to eight even thou I argued it was five. Left being a bit freaked that the bottle is going to blow up on the drive home.
Drove home installed in the bottle and went back to work.
About three hours later my girl friend phones freaking out saying my co2 tank is exploding all over. I ask, did it explode or is it leaking, she says exploding get home, hangs up!
Drive the five minutes home panicking from what bad results could come from this. Arrive home and the bottle is empty, frozen like ice in its bracket.
So my assumption is the bottle was over filled, when it warmed up from lights and such the co2 expanded blowing out the pressure safety valve on the bottle empting it very quickly freaking out the household.
Yea the girl friend is still ****ed! Luckily no other damage caused.
So watch those bottle pressures.

Dave