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?

It's better because there is an alarm / indicator of some sort
monitoring the space between the tank walls. Inner wall fails, alarm
goes off and the tank is drained and replaced before the outer wall can
fail.