mm wrote:
On Sun, 15 Jul 2007 21:04:37 -0400, George
wrote:

I know a few friends whose insurer required tanks to be replaced only
because of age. It also lessens further risk because all new interior
tanks are double wall.

But after one wall fails, eventually the other wall will too. So in
the long run, how is this better than single wall?

Coffee didn't kick in yet. A double wall is valuable because you can
periodically sample inside the second wall or install a alarm that will
sound if it detects something.