Interpreting of "thickness is the minimum dimension of the heaviest section"

[PRjuventus]

Hello everyone,

I've noticed in AMS2772, as well as other material specification, to determine the thickness, it says "thickness is the minimum dimension of the heaviest section" . For bar, rod, plate, this is quite simple, but if for a forging or some extrusion which have complex shape, how to understand the sentence "minimum dimension of the heaviest section"?

Previous my experience for determine effective thickness of a part is laying out a virtual maximum inscribed sphere in it, then the diameter of that sphere became the effective thickness, i'm not sure is this the intention of the definition "thickness" in AMS2772?

Thank you and have a great day!