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[pleckner]

Liquid seals will always be cheaper than a bursting disk. However, a busting disk would be used in say, a bio/pharm plant where the liquid seal is a sourse of microbial buildup becuase it is stagnant. So, for the model you describe, the bursting disk is used instead and the bursting presusre is nominal. It should be only what it takes to protect the vessel from overflow. For instance, if you have a 20' vessel and the overflow at 18', then you would typcially only allow a few inches of liquid head above the overflow before you would want the disk to burst.