Which cryogenic liquid cylinder in this photo still has a vacuum?
Actually, the only thing we can tell from this photo is that the bottom two do not have any vacuum since their vacuum rupture disks are both blown. The top liquid cylinder might or might not, but this can only be determined through testing.
Vacuum rupture disks are installed on cryogenic liquid cylinders and tanks to protect the outer vessel from rupturing. The inner vessel of a cryogenic tank or liquid cylinder is typically designed as a pressure vessel. Both resetting relief devices and one time rupture disks (head safeties) are usually installed to prevent the inner vessel from over-pressuring and exploding. The outer vessel is only a protective skin and carries no pressure rating. A leak from the inner vessel into the annulus causes pressure to build against the outer vessel. Vacuum rupture disks or vacuum lift plates are installed on outer vessels to allow them the vent almost immediately in the event pressure begins to form in the annulus.
The next things we’d like to know are what might be determined from “how” the disk blew and “who” might should bear the cost of repair.
Actually, the only thing we can tell from this photo is that the bottom two do not have any vacuum since their vacuum rupture disks are both blown. The top liquid cylinder might or might not, but this can only be determined through testing.
Vacuum rupture disks are installed on cryogenic liquid cylinders and tanks to protect the outer vessel from rupturing. The inner vessel of a cryogenic tank or liquid cylinder is typically designed as a pressure vessel. Both resetting relief devices and one time rupture disks (head safeties) are usually installed to prevent the inner vessel from over-pressuring and exploding. The outer vessel is only a protective skin and carries no pressure rating. A leak from the inner vessel into the annulus causes pressure to build against the outer vessel. Vacuum rupture disks or vacuum lift plates are installed on outer vessels to allow them the vent almost immediately in the event pressure begins to form in the annulus.
The next things we’d like to know are what might be determined from “how” the disk blew and “who” might should bear the cost of repair.
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