TrimixToo
Contributor
Is it possible for the first skit disk to rupture in a hot car when the tank is somewhat empty 500 pounds of pressure
Everything is possible, except for skiing through a revolving door. Another heat cycle with another pressure change could be the straw that broke the fatigue camel's...er...burst disk.
Probable is another matter. As a rule, burst discs fail when tanks are full or being filled, when the pressure across the disc is at a maximum or rising or both. Or, as happened to me once, left in a hot car when full. (Full of Trimix. Of course. It had to be Trimix. Air is too cheap and quick to refill just in advance of a dive charter for it to have been air.) But in reality, once the fatigue life of the disk is at an end, any flexing in any direction can precipitate the failure.