[PSUBS-MAILIST] K3000 spherical shell calculations

[Sean T. Stevenson]

Further to this discussion, additional safety factor or design crush
depth beyond the ABS maximum allowable working pressure may be a moot
point in this example, as the payload capacity (net buoyancy) of the
shell in question (A516 grade 70, 6' inner diameter) becomes negatively
buoyant at only 1152 m working depth, meaning that if you design for
deeper than that, the shell becomes heavy enough that you need
supplemental buoyancy to stay afloat.  With HY-80, the situation
improves significantly, extending depth to 2347 m before going negative.





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