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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.<br>
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<img src="cid:part1.01040208.02000002@telus.net" alt=""><br>
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<img src="cid:part2.07020504.01050703@telus.net" alt=""><br>
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