Hmm, OK.

One thought that is re assuring..... Aluminum and steel boat interiors are
insulated with a poly urethane foam.

The tank I need to return to service has been out of the boat for a few
years. It looks good but I will pressure test before re-installing. The
other 30 year old tanks do not leak, hence the consideration for going back
to foam support.

I am happy to report all tanks have clean outs and can be removed from the
boat without major cabinet destruction. If they do ever start leaking I
guess I would go with with aluminum replacements.

Thanks all.

"Leo Petipas" wrote in message
ble.rogers.com...
I have done work similar to this. If you get the low expansion insulation
foam (urethane) in a can and start from the deepest part of the cavities,
working your way outward slowly in slow sweeping motions, allowing the
previous passes to max out their expansion, you should be okay. Do a
sample
cavity that you rig yourself to get a feel for it, then move quickly to
your
installation and go. The application tube from the can plugs up quickly,
so
be organized and move it along. If you use the high expansion foam, you
can
pressurized the area risking breeches, crushing, bursting, in the adjacent
surfaces. Get some more input than what I am saying to round out your
research.
Leo
"Bryan B" wrote in message
...
I need to re-install a diesel tank. It was foamed in place and an then
tab
glassed to the top of the bulkhead and hull. No problem with the glass
work
but what foam should be used for the tank. The tank is 316 ss about 30
gallons.

Thanks,

Bryan