Tank Storage.

[TrimixToo]

Over 20 years ago I was trained that a cave fill usually involves a diver with enough common sense to replace the burst disk with a piece of stainless steel shim stock that will not fail. If the tank gets really hot the tank neck O-Ring should melt and fail long before a new burst disk will fail.
Since the move away from tape-sealed taper thread valves to O-Ring sealed tank necks over 50 years ago, there is no sane reason to use a burst disk, except for 50 year out of date DOT regulations.
In europe, nobody uses burst disk valves and our tanks still don't detonate in a house fire.

Michael

 

[Bob DBF]

Cave filled AL 80?

From the looks of the valve, perhaps a 6351 "bad" alloy tank.

Enquiring minds...


Bob

 

[TrimixToo]

Cave filled AL 80?

From the looks of the valve, perhaps a 6351 "bad" alloy tank.

Enquiring minds...


Bob

AL80 that failed in a fire. Not an SLC failure, so alloy is not relevant. Had to have been only part full, else the pressure rise would have blown the burst disc before the tank weakened and failed. Just as clearly, the O-ring didn't melt before the tank failed, either. It was displayed in a now-closed dive shop in Dunedin FL some years back, and I took pics.

The moral of the story? Store AL tanks either full or near-empty.

 

[JackD342]

Or, burst disc had been doubled or replaced with a blank.