Importance of Understanding background to the ASME code rules

A: Option A drives unnecessary steel weight and fatigue risk in the support without addressing the real cyclic stress driver. Option B stacks conservatism blindly and can still miss fatigue hotspots at nozzles. Option D assumes margins meant for fabrication variability also cover service transients, which they don't. Option C aligns with the reason Div 2 exists, letting you model real stresses instead of hiding behind blanket allowables.

A: Option A misses the cracking risk that isn't mitigated by extra wall thickness. Option B imports a refinery failure mode that doesn't activate at 65°C. Option C confuses external chloride exposure with internal sour service damage. Option D reflects why sour service rules exist and why hardness control matters more than nominal strength.

A: Option A drops weld efficiency and underestimates required wall dangerously. Option B inflates pressure basis subtly and skews the result. Option C mixes design and test conditions, embedding an untraceable safety factor. Option D follows the intent of the rule rather than just the algebra.

A: Option A ignores duration and cycles, which drive damage not peak value alone. Option B relies on operational behavior the code doesn't assume. Option D shifts responsibility incorrectly to support design. Option C reflects the background thinking on fatigue and time-at-stress.