On 10 Feb 2005 15:00:05 -0800, wrote:
I will drill a few test holes as suggested earlier to get an idea of
what may be inside and relieve any possible differences in pressure if
it is a double wall. If it turns out that there is some insulating
material that can not be removed or has a temperature problem then it
may not be possible to use the tank.

Maybe before you wreck it, you could put it on eBay, and then buy
something more known to be suitable? Once you make the test holes,
it's guaranteed to be junk for it's intended purpose.

Or, contact the manufacturer of the vessel and ask them about your
intended use and it's characteristics at high temperatures.