I've never sued anyone in my life, and I'm over 60, so, probably not. Unless someone was hurt badly, and then I'd probably want their medical costs covered.
Also, I must repeat, the chance of the tank blowing up is so low that it's more likely that the chimney will blow over in a strong wind - so I must deal with more pragmatic matters.
The most pragmatic seems to be for me to buy a new tank (if they won't sell the old one to me for a good price).
The key problem with a new tank is that the old grandfathered rules no longer apply - so - I am scoping out the additional concrete pad, tie-down points, trench, conduit, risers, & regulators.