On Wed, 21 Jul 2010 10:15:41 -0500, dpb wrote:

I'd try to make a shaded location ... to minimize the chances of
lifting the safety relief on a hot day of a full can

These are the new Blitz enviroflow cans. I don't think they have a safety
release.

I guess they must, but they've been tested to not leak one bit subject to
the hottest temperatures possible out in the sun for a year and they didn't
lose an ounce (they measure gas loss by weight, not volume since it expands
so much).

I always fill to the fill line and no more so I think there is no release
(which I know is contrarian thinking) engineered into these cans.

I guess if someone artificially heats them to something over 200 degrees,
they might have a release, but as far as I know, the tests show they hold
their gas (the problem is getting it out, not keeping it in).